A. Giudici, G. Acconcia, I. Labanca, M. Ghioni, I. Rech
Single Photon Avalanche Diodes (SPADs) are the enabling device for different kind of applications in which low noise, high photon detection efficiency, and compactness are required. They are capable of providing high photon count rate and picosecond timing precision. Furthermore, they can be fabricated in arrays, unlocking very high-count rates and the possibility to retrieve also incident photon’s spatial information. For these reasons, SPADs are the sensors of choice in many applications such as Light detection and ranging (LiDAR), Time Correlated Single Photon counting (TCSPC) and quantum key distribution (QKD). Whether the SPAD is implemented in a custom technology, allowing detector tailoring on specific application constraints, or in a CMOS process, with great benefits in terms of large-scale integration and compactness, a quenching circuit is always required, and it sets the ultimate performance that can be extracted from this sensor. The custom approach for SPAD fabrication poses a challenge in the design of the external quenching circuit mainly due to the parasitics (capacitance, wire-bonding inductance, etc.) that intrinsically come with having the detector and the circuit on two separate silicon dies, which is potentially a limiting factor for speed and timing precision. In this work, we present a fully-integrated active quenching circuit capable of driving external custom SPADs up to 250 Mcps. The circuit has been fabricated exploiting a 150nm high voltage technology and extensively tested with a custom SPAD.
{"title":"A 150nm fully integrated active quenching circuit driving custom technology SPAD at 250Mcps","authors":"A. Giudici, G. Acconcia, I. Labanca, M. Ghioni, I. Rech","doi":"10.1117/12.2636068","DOIUrl":"https://doi.org/10.1117/12.2636068","url":null,"abstract":"Single Photon Avalanche Diodes (SPADs) are the enabling device for different kind of applications in which low noise, high photon detection efficiency, and compactness are required. They are capable of providing high photon count rate and picosecond timing precision. Furthermore, they can be fabricated in arrays, unlocking very high-count rates and the possibility to retrieve also incident photon’s spatial information. For these reasons, SPADs are the sensors of choice in many applications such as Light detection and ranging (LiDAR), Time Correlated Single Photon counting (TCSPC) and quantum key distribution (QKD). Whether the SPAD is implemented in a custom technology, allowing detector tailoring on specific application constraints, or in a CMOS process, with great benefits in terms of large-scale integration and compactness, a quenching circuit is always required, and it sets the ultimate performance that can be extracted from this sensor. The custom approach for SPAD fabrication poses a challenge in the design of the external quenching circuit mainly due to the parasitics (capacitance, wire-bonding inductance, etc.) that intrinsically come with having the detector and the circuit on two separate silicon dies, which is potentially a limiting factor for speed and timing precision. In this work, we present a fully-integrated active quenching circuit capable of driving external custom SPADs up to 250 Mcps. The circuit has been fabricated exploiting a 150nm high voltage technology and extensively tested with a custom SPAD.","PeriodicalId":52940,"journal":{"name":"Security and Defence Quarterly","volume":"26 1","pages":"122740C - 122740C-6"},"PeriodicalIF":0.0,"publicationDate":"2022-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90340046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Guillemet, M. L. Lee, J. Cholet, D. Jussey, A. Delboulbé, S. Xavier, B. Loiseaux, P. Garabédian
We report on nanoimprint and plasma etching technologies development for high-density sub-wavelength surface structuration at a scale from 1.5μm to 200nm or below, to get multifunctional windows (of size ~2”-3”) offering both outstanding optical and fluidic properties. Such windows are of interest for outdoor surveillance systems, which need to operate whatever the environmental conditions. We demonstrate the realization of multifunctional surfaces enabling antireflection and water repellency properties on different optical materials, i.e. glass/silica, silicon and germanium, for applications from visible to longwave infrared domains. Illustration of such multifunctional window advantages for imaging is provided thanks to its integration in front of a MWIR camera and image analysis in presence of water droplet.
{"title":"Nanoimprint-based subwavelength multifunctional optical windows: from visible to longwave infrared applications","authors":"R. Guillemet, M. L. Lee, J. Cholet, D. Jussey, A. Delboulbé, S. Xavier, B. Loiseaux, P. Garabédian","doi":"10.1117/12.2636213","DOIUrl":"https://doi.org/10.1117/12.2636213","url":null,"abstract":"We report on nanoimprint and plasma etching technologies development for high-density sub-wavelength surface structuration at a scale from 1.5μm to 200nm or below, to get multifunctional windows (of size ~2”-3”) offering both outstanding optical and fluidic properties. Such windows are of interest for outdoor surveillance systems, which need to operate whatever the environmental conditions. We demonstrate the realization of multifunctional surfaces enabling antireflection and water repellency properties on different optical materials, i.e. glass/silica, silicon and germanium, for applications from visible to longwave infrared domains. Illustration of such multifunctional window advantages for imaging is provided thanks to its integration in front of a MWIR camera and image analysis in presence of water droplet.","PeriodicalId":52940,"journal":{"name":"Security and Defence Quarterly","volume":"22 1","pages":"122740Z - 122740Z-8"},"PeriodicalIF":0.0,"publicationDate":"2022-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72524811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
P. Pivkin, V. Grechishnikov, A. Ershov, Sergey N. Grigoriev S.
The geometric parameters of sharpening the rake surface are very important for the efficient use of the drill. Therefore, it is important to know the correct sharpening angle of the drill in the radial direction. This is especially important at the stage of regrinding the drill, due to the incorrect installation of the drill into the fixture. In this paper, a new image processing algorithm is proposed that allows you to set indicators and factors that determine the correct choice of the angular position of the drill after regrinding. This algorithm can be of great industrial use due to the simplicity of implementation and minimization of the necessary equipment for setting up the measuring station. The presented model has an important application value and differs from the existing ones in that it can be applied for regrinding of drills with curvilinear cutting edges. This advantage is achieved by using a simpler construction of the drill’s flank surfaces. The proposed design ensures a rational distribution of the clearance angle value along the cutting part regardless of the original shape of the flank surface before the regrinding. Taking into account the limitations of the image processing algorithm and the theoretical model of the cutting part of a tri-flute drill, a rational ratio of the rake and clearance angles obtained by simulating the edge movement in cutting process. This approach allows a radical revision of the traditional recommendations for regrinding process of tri-flute drills. This is becomes possible to solve problems associated with regrinding drills with involute and multi-level flat flank surface. However, the validity of our work still needs to be carefully checked.
{"title":"New image processing algorithm to control the accuracy of sharpening drills","authors":"P. Pivkin, V. Grechishnikov, A. Ershov, Sergey N. Grigoriev S.","doi":"10.1117/12.2641908","DOIUrl":"https://doi.org/10.1117/12.2641908","url":null,"abstract":"The geometric parameters of sharpening the rake surface are very important for the efficient use of the drill. Therefore, it is important to know the correct sharpening angle of the drill in the radial direction. This is especially important at the stage of regrinding the drill, due to the incorrect installation of the drill into the fixture. In this paper, a new image processing algorithm is proposed that allows you to set indicators and factors that determine the correct choice of the angular position of the drill after regrinding. This algorithm can be of great industrial use due to the simplicity of implementation and minimization of the necessary equipment for setting up the measuring station. The presented model has an important application value and differs from the existing ones in that it can be applied for regrinding of drills with curvilinear cutting edges. This advantage is achieved by using a simpler construction of the drill’s flank surfaces. The proposed design ensures a rational distribution of the clearance angle value along the cutting part regardless of the original shape of the flank surface before the regrinding. Taking into account the limitations of the image processing algorithm and the theoretical model of the cutting part of a tri-flute drill, a rational ratio of the rake and clearance angles obtained by simulating the edge movement in cutting process. This approach allows a radical revision of the traditional recommendations for regrinding process of tri-flute drills. This is becomes possible to solve problems associated with regrinding drills with involute and multi-level flat flank surface. However, the validity of our work still needs to be carefully checked.","PeriodicalId":52940,"journal":{"name":"Security and Defence Quarterly","volume":" 6","pages":"1227419 - 1227419-9"},"PeriodicalIF":0.0,"publicationDate":"2022-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72383550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Marceau Bamond, N. Hueber, G. Strub, S. Changey, Jonathan Weber
Compared to frame-based visual streams, event-driven visual streams offer very low bandwidth needs and high temporal resolution, making them an interesting choice for embedded object recognition. Such visual systems are seen to overcome standard cameras performances but have not yet been studied in the frame of Homing Guidance for projectiles, with drastic navigation constraints. This work starts from a first interaction model between a standard camera and an event camera, validated in the context of unattended ground sensors and situational awareness applications from a static position. In this paper we propose to extend this first interaction model by bringing a higher-level activity analysis and object recognition from a moving position. The proposed event-based terminal guidance system is studied firstly through a target laser designation scenario and the optical flow computation to validate guidance parameters. Real-time embedded processing techniques are evaluated, preparing the design of a future demonstrator of a very fast navigation system. The first results have been obtained using embedded Linux architectures with multi-threaded features extractions. This paper shows and comments these first results.
{"title":"Visual homing guidance for projectiles using event-cameras","authors":"Marceau Bamond, N. Hueber, G. Strub, S. Changey, Jonathan Weber","doi":"10.1117/12.2638477","DOIUrl":"https://doi.org/10.1117/12.2638477","url":null,"abstract":"Compared to frame-based visual streams, event-driven visual streams offer very low bandwidth needs and high temporal resolution, making them an interesting choice for embedded object recognition. Such visual systems are seen to overcome standard cameras performances but have not yet been studied in the frame of Homing Guidance for projectiles, with drastic navigation constraints. This work starts from a first interaction model between a standard camera and an event camera, validated in the context of unattended ground sensors and situational awareness applications from a static position. In this paper we propose to extend this first interaction model by bringing a higher-level activity analysis and object recognition from a moving position. The proposed event-based terminal guidance system is studied firstly through a target laser designation scenario and the optical flow computation to validate guidance parameters. Real-time embedded processing techniques are evaluated, preparing the design of a future demonstrator of a very fast navigation system. The first results have been obtained using embedded Linux architectures with multi-threaded features extractions. This paper shows and comments these first results.","PeriodicalId":52940,"journal":{"name":"Security and Defence Quarterly","volume":"72 1","pages":"122740H - 122740H-9"},"PeriodicalIF":0.0,"publicationDate":"2022-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86363643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We report on a series of novel experimental results based on new electrically conductive nanoparticle-electrically insulating, guest-host, electromagnetic interference shielding (EMIS) composites. An EMIS effectiveness in excess of -10dB was achieved over a frequency range of 8 to 12 GHz. Film thicknesses were ~150 μm. Material processing, thin film fabrication and EMIS effectiveness are presented.
{"title":"New high electromagnetic shielding effectiveness composite materials","authors":"J. Grote, M. Salour","doi":"10.1117/12.2647348","DOIUrl":"https://doi.org/10.1117/12.2647348","url":null,"abstract":"We report on a series of novel experimental results based on new electrically conductive nanoparticle-electrically insulating, guest-host, electromagnetic interference shielding (EMIS) composites. An EMIS effectiveness in excess of -10dB was achieved over a frequency range of 8 to 12 GHz. Film thicknesses were ~150 μm. Material processing, thin film fabrication and EMIS effectiveness are presented.","PeriodicalId":52940,"journal":{"name":"Security and Defence Quarterly","volume":"23 1","pages":"1227412 - 1227412-4"},"PeriodicalIF":0.0,"publicationDate":"2022-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82155901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yuri V. Filatov, A. Kukaev, E. Shalymov, Vladimir Y. Venediktov
A sample of a ring confocal resonator designed to operate as a sensitive element of an optical resonator gyroscope is studied. The sample has a monoblock design - the resonator is a single block (prism) with reflective surfaces operating on the effect of total internal reflection. The optical contour of the resonator has the shape of a square with a side length of 10 mm and is formed by four reflective surfaces. Three reflecting surfaces are flat, and one is toroidal with curvature radii in the meridional and sagittal planes that satisfy the confocality condition. The resonator is designed to operate at wavelengths of about 1.55 μm. The advantages of using a of a ring confocal resonator as a sensitive element of an optical resonator gyroscope are analyzed. In particular, it is shown that the reduction of the angular velocity measurement error caused by the optical Kerr effect becomes possible (compared to the use of a waveguide cavity and a whispering gallery mode cavity). The resistance of the system to external influences also improves.
{"title":"Investigation of a ring confocal resonator sample designed to work as an optical resonator gyroscope sensitive element","authors":"Yuri V. Filatov, A. Kukaev, E. Shalymov, Vladimir Y. Venediktov","doi":"10.1117/12.2635922","DOIUrl":"https://doi.org/10.1117/12.2635922","url":null,"abstract":"A sample of a ring confocal resonator designed to operate as a sensitive element of an optical resonator gyroscope is studied. The sample has a monoblock design - the resonator is a single block (prism) with reflective surfaces operating on the effect of total internal reflection. The optical contour of the resonator has the shape of a square with a side length of 10 mm and is formed by four reflective surfaces. Three reflecting surfaces are flat, and one is toroidal with curvature radii in the meridional and sagittal planes that satisfy the confocality condition. The resonator is designed to operate at wavelengths of about 1.55 μm. The advantages of using a of a ring confocal resonator as a sensitive element of an optical resonator gyroscope are analyzed. In particular, it is shown that the reduction of the angular velocity measurement error caused by the optical Kerr effect becomes possible (compared to the use of a waveguide cavity and a whispering gallery mode cavity). The resistance of the system to external influences also improves.","PeriodicalId":52940,"journal":{"name":"Security and Defence Quarterly","volume":"142 1","pages":"1227417 - 1227417-7"},"PeriodicalIF":0.0,"publicationDate":"2022-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75763913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
P. Connolly, Y. Shah, J. Valli, Arran J Sykes, J. Grant, Claudio Accarino, Y. Altmann, C. Rickman, D. Cumming, G. Buller
This paper introduces the field of metamaterials, details various optical uses of metasurfaces and demonstrates their suitability for imaging with single-photon avalanche diode (SPAD) detector arrays as an integrated optical component. A design for a metasurface-based color filter array (CFA) is presented, the fabrication methodology detailed, and a sample is integrated with a SPAD array. Examples of imaging applications using the integrated assembly are demonstrated, including passive and fluorescence imaging microscopy. The limitations of current metasurface color filtering techniques are highlighted and directions for future advances and applications discussed.
{"title":"Advances in metasurface-based mosaic filters for single-photon detector arrays","authors":"P. Connolly, Y. Shah, J. Valli, Arran J Sykes, J. Grant, Claudio Accarino, Y. Altmann, C. Rickman, D. Cumming, G. Buller","doi":"10.1117/12.2643396","DOIUrl":"https://doi.org/10.1117/12.2643396","url":null,"abstract":"This paper introduces the field of metamaterials, details various optical uses of metasurfaces and demonstrates their suitability for imaging with single-photon avalanche diode (SPAD) detector arrays as an integrated optical component. A design for a metasurface-based color filter array (CFA) is presented, the fabrication methodology detailed, and a sample is integrated with a SPAD array. Examples of imaging applications using the integrated assembly are demonstrated, including passive and fluorescence imaging microscopy. The limitations of current metasurface color filtering techniques are highlighted and directions for future advances and applications discussed.","PeriodicalId":52940,"journal":{"name":"Security and Defence Quarterly","volume":"68 1","pages":"122740J - 122740J-8"},"PeriodicalIF":0.0,"publicationDate":"2022-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81110555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Jain, Ivan Derkach, Hou-Man Chin, R. Filip, U. Andersen, Vladyslav C. Usenko, T. Gehring
Encoding of key bits in the quadratures of the electromagnetic light field is an essential part of any continuousvariable quantum key distribution system. However, flaws of practical implementation can make such systems susceptible to leakage of secret information. We verify a side channel presence in an optical in-phase and quadrature modulator which is caused by limited suppression of a quantum information-carrying sideband. We investigate various strategies an unauthorized third party can exploit the vulnerability in a proof-of-concept experiment and theoretically assess the modulation leakage effect on a security of the Gaussian coherent-state continuous-variable quantum key distribution protocol and show that the leakage reduces the range of conditions which support secure key generation. Without the control of sideband modulation in practical in-phase and quadrature modulator-based systems the security can be compromised.
{"title":"Modulator vulnerability in continuous-variable quantum key distribution","authors":"N. Jain, Ivan Derkach, Hou-Man Chin, R. Filip, U. Andersen, Vladyslav C. Usenko, T. Gehring","doi":"10.1117/12.2638795","DOIUrl":"https://doi.org/10.1117/12.2638795","url":null,"abstract":"Encoding of key bits in the quadratures of the electromagnetic light field is an essential part of any continuousvariable quantum key distribution system. However, flaws of practical implementation can make such systems susceptible to leakage of secret information. We verify a side channel presence in an optical in-phase and quadrature modulator which is caused by limited suppression of a quantum information-carrying sideband. We investigate various strategies an unauthorized third party can exploit the vulnerability in a proof-of-concept experiment and theoretically assess the modulation leakage effect on a security of the Gaussian coherent-state continuous-variable quantum key distribution protocol and show that the leakage reduces the range of conditions which support secure key generation. Without the control of sideband modulation in practical in-phase and quadrature modulator-based systems the security can be compromised.","PeriodicalId":52940,"journal":{"name":"Security and Defence Quarterly","volume":"10 1","pages":"122740R - 122740R-5"},"PeriodicalIF":0.0,"publicationDate":"2022-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80846088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ewan Wade, A. Mccarthy, Rachael Tobin, Abderrahim Halimi, J. Garcia-Armenta, G. Buller
Sub-pixel micro-scanning is a relatively simple way of utilizing a low pixel count sensor to better realise the resolution capabilities of a given objective lens. This technique accomplishes this by shifting the sensor array in the image plane through distances less than the pixel dimensions, gathering multiple images from different viewpoints that can be combined into a single, more detailed image. Applying this technique to a single-photon counting light detection and ranging (LiDAR) system allows for improved depth and intensity image reconstruction. Time-correlated single-photon counting (TCSPC) allowed for time-of-flight data to be measured, and the high-sensitivity and picosecond timing resolution this provided enabled us to create high-resolution intensity images and depth maps from distant targets whilst maintaining low average optical output power levels. The LiDAR system operated at a wavelength of 1550 nm, and used a pulsed fiber laser source for flood-illumination of the target scene. The detector was a 32 × 32 InGaAs/InP single-photon avalanche diode detector array mounted on precision translation stages. Operating in the short-wave infrared meant that the system could work at long range in daylight conditions, as the effect of solar background is reduced compared to shorter wavelengths and atmospheric transmission was relatively high. This paper presents depth and intensity profiles taken at a target range of approximately 325 m from the system location. The transceiver system operated at eye-safe, low average optical output power levels, typically below 5 mW.
{"title":"Micro-scanning of a focal plane detector array in a single-photon LiDAR system for improved depth and intensity image reconstruction","authors":"Ewan Wade, A. Mccarthy, Rachael Tobin, Abderrahim Halimi, J. Garcia-Armenta, G. Buller","doi":"10.1117/12.2639979","DOIUrl":"https://doi.org/10.1117/12.2639979","url":null,"abstract":"Sub-pixel micro-scanning is a relatively simple way of utilizing a low pixel count sensor to better realise the resolution capabilities of a given objective lens. This technique accomplishes this by shifting the sensor array in the image plane through distances less than the pixel dimensions, gathering multiple images from different viewpoints that can be combined into a single, more detailed image. Applying this technique to a single-photon counting light detection and ranging (LiDAR) system allows for improved depth and intensity image reconstruction. Time-correlated single-photon counting (TCSPC) allowed for time-of-flight data to be measured, and the high-sensitivity and picosecond timing resolution this provided enabled us to create high-resolution intensity images and depth maps from distant targets whilst maintaining low average optical output power levels. The LiDAR system operated at a wavelength of 1550 nm, and used a pulsed fiber laser source for flood-illumination of the target scene. The detector was a 32 × 32 InGaAs/InP single-photon avalanche diode detector array mounted on precision translation stages. Operating in the short-wave infrared meant that the system could work at long range in daylight conditions, as the effect of solar background is reduced compared to shorter wavelengths and atmospheric transmission was relatively high. This paper presents depth and intensity profiles taken at a target range of approximately 325 m from the system location. The transceiver system operated at eye-safe, low average optical output power levels, typically below 5 mW.","PeriodicalId":52940,"journal":{"name":"Security and Defence Quarterly","volume":"470 ","pages":"1227404 - 1227404-7"},"PeriodicalIF":0.0,"publicationDate":"2022-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72419345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
P. Pivkin, I. Minin, A. Ershov, V. Voronin, M. Volosova, V. Kuznetzov, A. Nadykto
Modern methods of control geometry parameters of cutting tools often incorporate measuring operations performed using high-precision CCD cameras which work on the contrast-detection method. The key advantages of this method are the high speed of measurements, the simplicity of using general method on modern CNC measuring systems and a wide range of possibilities for controlling profile locations of surfaces. However, using this method largely depends on the resolution of the camera's ability and the size of the controlled area, which in turn imposes significant restrictions on the measurement of surface areas which are less than 10% of the frame area. This paper proposes a new way to measure the area of profile section of microtool surfaces, based on the identifying of a focused area throughout the entire frame area. This method makes it possible to recognize the nature of the focus distribution at different camera positions, which in turn makes it possible to measure the area of profile section of microtool surfaces when the size of the controlled area is less than 10% of the frame size to use the contrast autofocus method to incomparably increase.
{"title":"A new method for processing algorithm to recognition of the profile of micro-mills","authors":"P. Pivkin, I. Minin, A. Ershov, V. Voronin, M. Volosova, V. Kuznetzov, A. Nadykto","doi":"10.1117/12.2641910","DOIUrl":"https://doi.org/10.1117/12.2641910","url":null,"abstract":"Modern methods of control geometry parameters of cutting tools often incorporate measuring operations performed using high-precision CCD cameras which work on the contrast-detection method. The key advantages of this method are the high speed of measurements, the simplicity of using general method on modern CNC measuring systems and a wide range of possibilities for controlling profile locations of surfaces. However, using this method largely depends on the resolution of the camera's ability and the size of the controlled area, which in turn imposes significant restrictions on the measurement of surface areas which are less than 10% of the frame area. This paper proposes a new way to measure the area of profile section of microtool surfaces, based on the identifying of a focused area throughout the entire frame area. This method makes it possible to recognize the nature of the focus distribution at different camera positions, which in turn makes it possible to measure the area of profile section of microtool surfaces when the size of the controlled area is less than 10% of the frame size to use the contrast autofocus method to incomparably increase.","PeriodicalId":52940,"journal":{"name":"Security and Defence Quarterly","volume":"16 1","pages":"122741A - 122741A-8"},"PeriodicalIF":0.0,"publicationDate":"2022-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81659807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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