Pub Date : 2017-08-01DOI: 10.1109/INSCIT.2017.8103531
F. F. Carvalho, Alexandre Kennedy Pinto Souza, C. A. D. M. Cruz
Detecting local light incident angle is a desirable feature for CMOS image sensors for 3D image reconstruction purpose. Advances in the CMOS technologies in the lasts years have enabled integrated solutions to perform such a job. However, it is still not viable to implement such a feature in regular CMOS image sensors due to the great number of pixels necessary in a cluster to perform incident angle detection. In this paper, it is proposed a hybrid cluster with only four pixels, instead of eight pixels of previous solutions, that is able to detect both local light intensity and incident angle. The technique to detect local incident angle is widely exploited in the literature. Two novelties are explored in this work, the first is the new paradigm in polarization pixel-cluster design, and the second is extend ability of metal-shielded pixels to detect both local light angle and intensity. Experimental results show a dynamic range difference of less than 2.5 dB between a pixel with 40 % of metal shielding and a pixel no metal shielding.
{"title":"Hybrid grated pixel cluster for local light angle and intensity detection","authors":"F. F. Carvalho, Alexandre Kennedy Pinto Souza, C. A. D. M. Cruz","doi":"10.1109/INSCIT.2017.8103531","DOIUrl":"https://doi.org/10.1109/INSCIT.2017.8103531","url":null,"abstract":"Detecting local light incident angle is a desirable feature for CMOS image sensors for 3D image reconstruction purpose. Advances in the CMOS technologies in the lasts years have enabled integrated solutions to perform such a job. However, it is still not viable to implement such a feature in regular CMOS image sensors due to the great number of pixels necessary in a cluster to perform incident angle detection. In this paper, it is proposed a hybrid cluster with only four pixels, instead of eight pixels of previous solutions, that is able to detect both local light intensity and incident angle. The technique to detect local incident angle is widely exploited in the literature. Two novelties are explored in this work, the first is the new paradigm in polarization pixel-cluster design, and the second is extend ability of metal-shielded pixels to detect both local light angle and intensity. Experimental results show a dynamic range difference of less than 2.5 dB between a pixel with 40 % of metal shielding and a pixel no metal shielding.","PeriodicalId":416167,"journal":{"name":"2017 2nd International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT)","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122147299","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}
Pub Date : 2017-08-01DOI: 10.1109/INSCIT.2017.8103506
D. C. Lucena, R. Freire, J. Villanueva, B. Luciano, W. P. Farias
This paper presents some considerations about uncertainty and noise related to ultrasonic transducers in time of flight estimation for wind speed measurement with pulsed transmission mode. Experimental results show the noise distribution in a measurement setup using ultrasonic transducers and the relation between signal to noise ratio, uncertainties and number of cycles used in pulsed transmission by transceiver. From these results, the project considerations for ultrasonic signals acquisition can be defined, such as number of cycles and uncertainty evaluation.
{"title":"Design considerations for ultrasonic signals acquisition","authors":"D. C. Lucena, R. Freire, J. Villanueva, B. Luciano, W. P. Farias","doi":"10.1109/INSCIT.2017.8103506","DOIUrl":"https://doi.org/10.1109/INSCIT.2017.8103506","url":null,"abstract":"This paper presents some considerations about uncertainty and noise related to ultrasonic transducers in time of flight estimation for wind speed measurement with pulsed transmission mode. Experimental results show the noise distribution in a measurement setup using ultrasonic transducers and the relation between signal to noise ratio, uncertainties and number of cycles used in pulsed transmission by transceiver. From these results, the project considerations for ultrasonic signals acquisition can be defined, such as number of cycles and uncertainty evaluation.","PeriodicalId":416167,"journal":{"name":"2017 2nd International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131089643","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}
Pub Date : 2017-08-01DOI: 10.1109/INSCIT.2017.8103523
Juliano de Pelegrin, Bruno Monte de Carvalho, F. L. Bertotti, Jean M. S. Lafay, Jessé de Pelegrin
This paper presents the development of a displacement measurement system formed by a Linear Variable Differential Transformer (LVDT) and an electronic instrumentation circuit. A mechanical structure was constructed as a coil to be elaborated from a preliminary analysis of the response of the device. A circuit was developed for the excitation of the LVDT, analog processing and signal conditioning in order to obtain a proportional DC signal for the displacement in its core. The response of the measuring system was obtained for a total range of 80 mm of displacement. The measurement deviations were less than + 0.16 mm and − 0.15 mm.
{"title":"Development and evaluation of a linear variable differential sensor","authors":"Juliano de Pelegrin, Bruno Monte de Carvalho, F. L. Bertotti, Jean M. S. Lafay, Jessé de Pelegrin","doi":"10.1109/INSCIT.2017.8103523","DOIUrl":"https://doi.org/10.1109/INSCIT.2017.8103523","url":null,"abstract":"This paper presents the development of a displacement measurement system formed by a Linear Variable Differential Transformer (LVDT) and an electronic instrumentation circuit. A mechanical structure was constructed as a coil to be elaborated from a preliminary analysis of the response of the device. A circuit was developed for the excitation of the LVDT, analog processing and signal conditioning in order to obtain a proportional DC signal for the displacement in its core. The response of the measuring system was obtained for a total range of 80 mm of displacement. The measurement deviations were less than + 0.16 mm and − 0.15 mm.","PeriodicalId":416167,"journal":{"name":"2017 2nd International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT)","volume":"2016 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134296242","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}
Pub Date : 2017-08-01DOI: 10.1109/INSCIT.2017.8103507
Tarcísio Oliveira de Moraes, R. Freire, Isaias de Sousa Barbosa, C. P. de Souza
Ferromagnetic materials are characterized by magnetic dipoles that align themselves to the direction of an applied external magnetic field showing high and positive values of magnetic susceptibility. Many magnetic-based measurement devices are based on the ferromagnetic properties of its constituent materials and the proper magnetic characterization of these materials is essential. A hysteresigraph is an instrument for measuring hysteresis loops as a function of frequency and magnetic field, but, in general, it is very expensive. Thus, this paper presents a low-cost hysteresigraph for plotting hysteresis loops and magnetization curve of toroidal ferromagnetic cores in real time. The proposed hysteresigraph uses common instruments present in universities or research laboratories and a new simple mathematical modeling to obtain the magnetic properties (permeability, residual density and coercivity, for example) and magnetization curve.
{"title":"A low-cost hysteresigraph for plotting magnetization curve and characterizing of toroidal ferromagnetic cores using a new mathematical modeling","authors":"Tarcísio Oliveira de Moraes, R. Freire, Isaias de Sousa Barbosa, C. P. de Souza","doi":"10.1109/INSCIT.2017.8103507","DOIUrl":"https://doi.org/10.1109/INSCIT.2017.8103507","url":null,"abstract":"Ferromagnetic materials are characterized by magnetic dipoles that align themselves to the direction of an applied external magnetic field showing high and positive values of magnetic susceptibility. Many magnetic-based measurement devices are based on the ferromagnetic properties of its constituent materials and the proper magnetic characterization of these materials is essential. A hysteresigraph is an instrument for measuring hysteresis loops as a function of frequency and magnetic field, but, in general, it is very expensive. Thus, this paper presents a low-cost hysteresigraph for plotting hysteresis loops and magnetization curve of toroidal ferromagnetic cores in real time. The proposed hysteresigraph uses common instruments present in universities or research laboratories and a new simple mathematical modeling to obtain the magnetic properties (permeability, residual density and coercivity, for example) and magnetization curve.","PeriodicalId":416167,"journal":{"name":"2017 2nd International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127282303","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}
Pub Date : 2017-08-01DOI: 10.1109/INSCIT.2017.8103512
L. A. S. Pedotti, Ricardo Mazza Zago, F. Fruett
The vibration analysis is widely used in industry as an efficient tool to monitoring equipments integrity and its structures. The vibration monitoring usually is a task which include large and expansive equipments. Recently, micro eletromechanical systems (MEMS) accelerometers devices has been used successfully in this purpose, having results each more times significant. The present work shows a low-cost MEMS accelerometer used to measure two variables in rotating machines: the unbalancing and mechanical load. Using the acceleration measurements in the three axis was possible to trace the FFTs characteristics of rotational movement of a BLDC motor for electric bike. With this measurements, it's possible to recognize when the machine is operating in anyone of this conditions and evaluate how much unbalancing or mechanical load are being applied.
{"title":"Application of low-cost MEMS accelerometer to measure unbalancing and load on a BLDC motor","authors":"L. A. S. Pedotti, Ricardo Mazza Zago, F. Fruett","doi":"10.1109/INSCIT.2017.8103512","DOIUrl":"https://doi.org/10.1109/INSCIT.2017.8103512","url":null,"abstract":"The vibration analysis is widely used in industry as an efficient tool to monitoring equipments integrity and its structures. The vibration monitoring usually is a task which include large and expansive equipments. Recently, micro eletromechanical systems (MEMS) accelerometers devices has been used successfully in this purpose, having results each more times significant. The present work shows a low-cost MEMS accelerometer used to measure two variables in rotating machines: the unbalancing and mechanical load. Using the acceleration measurements in the three axis was possible to trace the FFTs characteristics of rotational movement of a BLDC motor for electric bike. With this measurements, it's possible to recognize when the machine is operating in anyone of this conditions and evaluate how much unbalancing or mechanical load are being applied.","PeriodicalId":416167,"journal":{"name":"2017 2nd International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121583260","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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