Pub Date : 2011-03-28DOI: 10.1109/SAS.2011.5739792
B. Uthuppu, N. Kostesha, M. Jakobsen, Spire M. Kiersgaard, J. Aamand, C. Jørgensen
We are working on the development of a real-time electrochemical sensor based on an immunoassay detection system to detect and quantify the presence of pesticide residues in ground water. Highly selective and sensitive immuno-reactions are being investigated to be optimized in order to bring them into the level of real-time in-line sensors. In this project a competitive immunoassay between surface immobilized 2,6-dichlorobenzamide (BAM) haptens and BAM present in the water sample using an anti-BAM monoclonal antibody is being described. 2,6-Dichlorobenzamide (BAM) is a degradation product of the herbicide, dichlobenil which has been used extensively in the past and it is among the most frequently found pesticide residues in European ground water. BAM is highly resistant to further degradation and is fairly soluble in water. We have synthesized and immobilized a small library of BAM haptens and compared the affinity constants of the antibody towards this library. Furthermore, since regeneration of the BAM-hapten surface is a prerequisite for the development of a real-time electrochemical sensor with immunoassay-based detection, studies on regeneration of surfaces, modified with the newly synthesized BAM-haptens has been preformed and compared and correlated to the measured affinity constants. By using conventional ELISA we were able to indicate that one of the immobilized BAM haptens with an intermediate affinity towards the anti-BAM antibody was better in terms of regeneration. Design and fabrication of a fully automated microfluidic based on this immunoassay and electrochemical detection are in progress.
{"title":"Optimization of immunochemistry for sensing techniques to detect pesticide residues in water","authors":"B. Uthuppu, N. Kostesha, M. Jakobsen, Spire M. Kiersgaard, J. Aamand, C. Jørgensen","doi":"10.1109/SAS.2011.5739792","DOIUrl":"https://doi.org/10.1109/SAS.2011.5739792","url":null,"abstract":"We are working on the development of a real-time electrochemical sensor based on an immunoassay detection system to detect and quantify the presence of pesticide residues in ground water. Highly selective and sensitive immuno-reactions are being investigated to be optimized in order to bring them into the level of real-time in-line sensors. In this project a competitive immunoassay between surface immobilized 2,6-dichlorobenzamide (BAM) haptens and BAM present in the water sample using an anti-BAM monoclonal antibody is being described. 2,6-Dichlorobenzamide (BAM) is a degradation product of the herbicide, dichlobenil which has been used extensively in the past and it is among the most frequently found pesticide residues in European ground water. BAM is highly resistant to further degradation and is fairly soluble in water. We have synthesized and immobilized a small library of BAM haptens and compared the affinity constants of the antibody towards this library. Furthermore, since regeneration of the BAM-hapten surface is a prerequisite for the development of a real-time electrochemical sensor with immunoassay-based detection, studies on regeneration of surfaces, modified with the newly synthesized BAM-haptens has been preformed and compared and correlated to the measured affinity constants. By using conventional ELISA we were able to indicate that one of the immobilized BAM haptens with an intermediate affinity towards the anti-BAM antibody was better in terms of regeneration. Design and fabrication of a fully automated microfluidic based on this immunoassay and electrochemical detection are in progress.","PeriodicalId":401849,"journal":{"name":"2011 IEEE Sensors Applications Symposium","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133184375","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 : 2011-03-28DOI: 10.1109/SAS.2011.5739791
Anjali Sharma, K. Sreenivas, Vinay Gupta, M. Tomar
Thin films of semiconducting SnO2 were deposited by using RF sputtering technique under 30% oxygen and 70% argon in the reactive (Ar+O2) gas mixture using a metallic tin (Sn) target at 16 mTorr deposition pressure. The SnO2 thin film deposited at optimized sputtering conditions was found to be highly sensitive (sensing response ∼ 1.4 × 104) to NO2 gas (10 ppm) at comparatively low operating temperatures (∼ 100°C), but with moderate response (4.1 minutes) and recovery speeds (33.4 minutes). Further the response and recovery times of the sensor structure were improved by loading Al2O3 and NiO nano clusters over SnO2 surface using E-beam evaporation and sputtering techniques respectively. Thickness of Al2O3 nano clusters was varied from 10 to 18nm to get the best sensing characteristics. The quality of SnO2 film and reaction kinetics of NO2 with SnO2 surface at the Sn sites play an important role in enhancing the sensing response and response speed at low temperatures (< 200°C).
{"title":"Trace level detection of NO2 gas using SnO2 thin films","authors":"Anjali Sharma, K. Sreenivas, Vinay Gupta, M. Tomar","doi":"10.1109/SAS.2011.5739791","DOIUrl":"https://doi.org/10.1109/SAS.2011.5739791","url":null,"abstract":"Thin films of semiconducting SnO<inf>2</inf> were deposited by using RF sputtering technique under 30% oxygen and 70% argon in the reactive (Ar+O<inf>2</inf>) gas mixture using a metallic tin (Sn) target at 16 mTorr deposition pressure. The SnO<inf>2</inf> thin film deposited at optimized sputtering conditions was found to be highly sensitive (sensing response ∼ 1.4 × 10<sup>4</sup>) to NO<inf>2</inf> gas (10 ppm) at comparatively low operating temperatures (∼ 100°C), but with moderate response (4.1 minutes) and recovery speeds (33.4 minutes). Further the response and recovery times of the sensor structure were improved by loading Al<inf>2</inf>O<inf>3</inf> and NiO nano clusters over SnO<inf>2</inf> surface using E-beam evaporation and sputtering techniques respectively. Thickness of Al<inf>2</inf>O<inf>3</inf> nano clusters was varied from 10 to 18nm to get the best sensing characteristics. The quality of SnO<inf>2</inf> film and reaction kinetics of NO<inf>2</inf> with SnO<inf>2</inf> surface at the Sn sites play an important role in enhancing the sensing response and response speed at low temperatures (< 200°C).","PeriodicalId":401849,"journal":{"name":"2011 IEEE Sensors Applications Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123542850","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 : 2011-03-28DOI: 10.1109/SAS.2011.5739818
J. Abu-Khalaf, S. Mascaro
The purpose of this paper is to experimentally determine the optimal optical parameters for transmitting light through the human fingernail bed in order to measure the change in blood volume that occurs when force is exerted on the fingertip. This “fingernail sensing” technique, which is a form of photoplethysmography, involves the placement of LEDs and photodetectors on the fingernail surface. As forces are applied to the fingertip, the blood perfusion in the fingernail bed is affected, resulting in various red and white regions of coloration beneath the fingernail. Thus, the transmittance of light across the fingernail bed changes as a function of applied force, resulting in a change in voltage from the photodetector circuit. Much research has previously been done to build and calibrate black-box models that estimate fingertip force based on the photodetector outputs. However, the effect of varying the wavelength and optical path length has never been thoroughly investigated. Due to recent advances in the manufacturing of fingernail sensors and the availability of surface mount LEDs of certain wavelengths, we now perform a thorough experimental characterization of the sensitivity of the transmittance to wavelength and optical path length. Results show the sensitivity is maximized when using green light (525 nm) and when the surface mount LED and photodiode are placed as close together as possible. Using data from the experiments, we also calibrate a physically-based model of the optical transmittance, which can be used to optimize fingernail sensor design.
{"title":"Optimization of fingernail sensing technique based on optical experimentation and modeling","authors":"J. Abu-Khalaf, S. Mascaro","doi":"10.1109/SAS.2011.5739818","DOIUrl":"https://doi.org/10.1109/SAS.2011.5739818","url":null,"abstract":"The purpose of this paper is to experimentally determine the optimal optical parameters for transmitting light through the human fingernail bed in order to measure the change in blood volume that occurs when force is exerted on the fingertip. This “fingernail sensing” technique, which is a form of photoplethysmography, involves the placement of LEDs and photodetectors on the fingernail surface. As forces are applied to the fingertip, the blood perfusion in the fingernail bed is affected, resulting in various red and white regions of coloration beneath the fingernail. Thus, the transmittance of light across the fingernail bed changes as a function of applied force, resulting in a change in voltage from the photodetector circuit. Much research has previously been done to build and calibrate black-box models that estimate fingertip force based on the photodetector outputs. However, the effect of varying the wavelength and optical path length has never been thoroughly investigated. Due to recent advances in the manufacturing of fingernail sensors and the availability of surface mount LEDs of certain wavelengths, we now perform a thorough experimental characterization of the sensitivity of the transmittance to wavelength and optical path length. Results show the sensitivity is maximized when using green light (525 nm) and when the surface mount LED and photodiode are placed as close together as possible. Using data from the experiments, we also calibrate a physically-based model of the optical transmittance, which can be used to optimize fingernail sensor design.","PeriodicalId":401849,"journal":{"name":"2011 IEEE Sensors Applications Symposium","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115099065","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 : 2011-03-28DOI: 10.1109/SAS.2011.5739774
A. Hassanzadeh, R. Lindquist
In this paper a CMOS single chip capacitive liquid crystal chemical and biological sensor is presented. Two on-chip interdigitated capacitors provide differential sensor measurement. The system consists of a low noise preamplifier, synchronous demodulator and low pass filter. For high sensitivity detection proper excitation signal voltage and frequency have been investigated and the preamplifier noise has been minimized using a nonlinear optimization algorithm. To the knowledge of the authors this is the first integrated capacitive liquid crystal chemical and biological sensor chip. The amplifier has 15aF resolution with 1kHz bandwidth and consumes 1mW of power and 0.4mm2 of chip area using AMI 0.5µm technology.
{"title":"Single chip solution to capacitive liquid crystal chemical and biological sensor","authors":"A. Hassanzadeh, R. Lindquist","doi":"10.1109/SAS.2011.5739774","DOIUrl":"https://doi.org/10.1109/SAS.2011.5739774","url":null,"abstract":"In this paper a CMOS single chip capacitive liquid crystal chemical and biological sensor is presented. Two on-chip interdigitated capacitors provide differential sensor measurement. The system consists of a low noise preamplifier, synchronous demodulator and low pass filter. For high sensitivity detection proper excitation signal voltage and frequency have been investigated and the preamplifier noise has been minimized using a nonlinear optimization algorithm. To the knowledge of the authors this is the first integrated capacitive liquid crystal chemical and biological sensor chip. The amplifier has 15aF resolution with 1kHz bandwidth and consumes 1mW of power and 0.4mm2 of chip area using AMI 0.5µm technology.","PeriodicalId":401849,"journal":{"name":"2011 IEEE Sensors Applications Symposium","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130692680","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 : 2011-03-28DOI: 10.1109/SAS.2011.5739824
I. Ahanian, S. Sadeghi, R. Moini
This paper proposes a modeling technique that predicts the output signal of an open-ended rectangular waveguide probe when scanning a long crack. The technique is based on a circuit approximation model and hence remarkably reduces the computation burden. In this model, the waveguide probe is replaced with a transmission line, the crack is replaced with a shorted transmission line, and the interface between the probe and the crack is replaced with an appropriate impedance. The validity of the proposed model is demonstrated by comparing the simulation results of several case studies with those obtained using a commercial finite integration technique code.
{"title":"A fast circuit model for interaction of open-ended rectangular waveguide probes with surface long cracks in metals","authors":"I. Ahanian, S. Sadeghi, R. Moini","doi":"10.1109/SAS.2011.5739824","DOIUrl":"https://doi.org/10.1109/SAS.2011.5739824","url":null,"abstract":"This paper proposes a modeling technique that predicts the output signal of an open-ended rectangular waveguide probe when scanning a long crack. The technique is based on a circuit approximation model and hence remarkably reduces the computation burden. In this model, the waveguide probe is replaced with a transmission line, the crack is replaced with a shorted transmission line, and the interface between the probe and the crack is replaced with an appropriate impedance. The validity of the proposed model is demonstrated by comparing the simulation results of several case studies with those obtained using a commercial finite integration technique code.","PeriodicalId":401849,"journal":{"name":"2011 IEEE Sensors Applications Symposium","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132932027","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 : 2011-03-28DOI: 10.1109/SAS.2011.5739808
Benito Mendoza, Peng Xu, Li Song
Petrochemical plants are extremely complex systems with many dynamically interconnected components. Traditional approaches to fault detection and diagnosis of these complex systems follow a centralized design in which huge and sophisticated models (e.g., first principle models) are constructed to process sensor data acquired from the entire plant. These systems are very difficult to design due to their complexity. Maintaining such a system to reflect any plant changes (e.g., equipment replacement), is also very challenging. In this article, we introduce a multi-agent model for fault detection and diagnosis which exploits the concept of leadership; that is, when a fault is detected one agent emerges as leader and coordinates the fault classification process. The proposed model is flexible, modular, decentralized, and portable. Our experimental results show that even using simple detection and diagnosis methods, the model can achieve comparable results to those from sophisticated centralized approaches.
{"title":"A multi-agent model for fault diagnosis in petrochemical plants","authors":"Benito Mendoza, Peng Xu, Li Song","doi":"10.1109/SAS.2011.5739808","DOIUrl":"https://doi.org/10.1109/SAS.2011.5739808","url":null,"abstract":"Petrochemical plants are extremely complex systems with many dynamically interconnected components. Traditional approaches to fault detection and diagnosis of these complex systems follow a centralized design in which huge and sophisticated models (e.g., first principle models) are constructed to process sensor data acquired from the entire plant. These systems are very difficult to design due to their complexity. Maintaining such a system to reflect any plant changes (e.g., equipment replacement), is also very challenging. In this article, we introduce a multi-agent model for fault detection and diagnosis which exploits the concept of leadership; that is, when a fault is detected one agent emerges as leader and coordinates the fault classification process. The proposed model is flexible, modular, decentralized, and portable. Our experimental results show that even using simple detection and diagnosis methods, the model can achieve comparable results to those from sophisticated centralized approaches.","PeriodicalId":401849,"journal":{"name":"2011 IEEE Sensors Applications Symposium","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115143682","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 : 2011-03-28DOI: 10.1109/SAS.2011.5739816
Vu Minh Quan, G. Sen Gupta, S. Mukhopadhyay
A greenhouse provides shelter and protects plants from harsh environment and external interferences. It allows plants to grow under an optimum condition which maximizes the growth potential of the plants. The existing systems only allow for the monitoring of climate variables such as temperature or humidity and often overlook many other important factors such as CO2, light, soil moisture, soil temperature etc. Neglecting these climate factors leads to inaccurate observation of the overall greenhouse climate condition. To make up for this weakness, the prototype designed for this particular research will allow better monitoring of the climate condition in a greenhouse by integrating several sensor elements such as CO2, temperature, humidity, light, soil moisture and soil temperature into the system. The purpose of this paper is to provide a review of a range of popular sensors on the market. The paper also discusses their operating principles as well as addresses their advantages and disadvantages. Experiments were carried to test the accuracy of the sensors and the results indicate that the sensors used in this project are relatively accurate and have good stability.
{"title":"Review of sensors for greenhouse climate monitoring","authors":"Vu Minh Quan, G. Sen Gupta, S. Mukhopadhyay","doi":"10.1109/SAS.2011.5739816","DOIUrl":"https://doi.org/10.1109/SAS.2011.5739816","url":null,"abstract":"A greenhouse provides shelter and protects plants from harsh environment and external interferences. It allows plants to grow under an optimum condition which maximizes the growth potential of the plants. The existing systems only allow for the monitoring of climate variables such as temperature or humidity and often overlook many other important factors such as CO2, light, soil moisture, soil temperature etc. Neglecting these climate factors leads to inaccurate observation of the overall greenhouse climate condition. To make up for this weakness, the prototype designed for this particular research will allow better monitoring of the climate condition in a greenhouse by integrating several sensor elements such as CO2, temperature, humidity, light, soil moisture and soil temperature into the system. The purpose of this paper is to provide a review of a range of popular sensors on the market. The paper also discusses their operating principles as well as addresses their advantages and disadvantages. Experiments were carried to test the accuracy of the sensors and the results indicate that the sensors used in this project are relatively accurate and have good stability.","PeriodicalId":401849,"journal":{"name":"2011 IEEE Sensors Applications Symposium","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134477409","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 : 2011-03-28DOI: 10.1109/SAS.2011.5739781
U. Timm, S. Andruschenko, M. Hinz, S. Koball, G. Leen, Elfed Lewis, J. Kraitl, Hartmut Ewald
Non-invasive and continuous accurate monitoring of a patients cardiovascular system can help to assure the early detection of potential abnormalities and trigger a prompt hemodynamic assessment. Such an assessment system is possible due to current advances in optical spectroscopy and signal processing. This paper presents a novel optical sensor system which facilitates the real-time monitoring of the standard pulse oximetry parameters and additionally the total haemoglobin (Hb) concentration, cardiac output and other important parameter. New algorithms were tested on 48 patients in a clinical environment. The sensor system enables painless hemodynamic patient monitoring with applications both in clinical settings and in home health care.
{"title":"Optical sensor system for continuous non-invasive hemodynamic monitoring in real-time","authors":"U. Timm, S. Andruschenko, M. Hinz, S. Koball, G. Leen, Elfed Lewis, J. Kraitl, Hartmut Ewald","doi":"10.1109/SAS.2011.5739781","DOIUrl":"https://doi.org/10.1109/SAS.2011.5739781","url":null,"abstract":"Non-invasive and continuous accurate monitoring of a patients cardiovascular system can help to assure the early detection of potential abnormalities and trigger a prompt hemodynamic assessment. Such an assessment system is possible due to current advances in optical spectroscopy and signal processing. This paper presents a novel optical sensor system which facilitates the real-time monitoring of the standard pulse oximetry parameters and additionally the total haemoglobin (Hb) concentration, cardiac output and other important parameter. New algorithms were tested on 48 patients in a clinical environment. The sensor system enables painless hemodynamic patient monitoring with applications both in clinical settings and in home health care.","PeriodicalId":401849,"journal":{"name":"2011 IEEE Sensors Applications Symposium","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121130409","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 : 2011-03-28DOI: 10.1109/SAS.2011.5739771
S. Makarov, U. Khan, Md. Monirul Islam, R. Ludwig, K. Pahlavan
This paper compares a basic, MATLAB coded, time-domain FDTD formulation for the path loss around the human body with accurate FEM modeling in Ansoft HFSS (ANSYS). We show that the time domain FDTD analysis yields comparable results even though it uses a homogeneous body model and simple boundary conditions. Reasons for this important observation are investigated. The present study only considers the exterior TX and RX antennas, which are located close to the body. A more detailed FDTD simulation of on-body antennas [1] is currently underway.
{"title":"On accuracy of simple FDTD models for the simulation of human body path loss","authors":"S. Makarov, U. Khan, Md. Monirul Islam, R. Ludwig, K. Pahlavan","doi":"10.1109/SAS.2011.5739771","DOIUrl":"https://doi.org/10.1109/SAS.2011.5739771","url":null,"abstract":"This paper compares a basic, MATLAB coded, time-domain FDTD formulation for the path loss around the human body with accurate FEM modeling in Ansoft HFSS (ANSYS). We show that the time domain FDTD analysis yields comparable results even though it uses a homogeneous body model and simple boundary conditions. Reasons for this important observation are investigated. The present study only considers the exterior TX and RX antennas, which are located close to the body. A more detailed FDTD simulation of on-body antennas [1] is currently underway.","PeriodicalId":401849,"journal":{"name":"2011 IEEE Sensors Applications Symposium","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124008401","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 : 2011-03-28DOI: 10.1109/SAS.2011.5739799
Siddharth Advani, Jason K. Van Velsor, J. Rose
Ultrasonic guided waves are now proving to be a viable method for real-world long-range Non-Destructive Evaluation (NDE) applications. In order to generate a specific guided wave mode optimally, knowledge of the sensor parameters becomes imperative. This paper attempts to experimentally measure the beam divergence in an Electro-Magnetic Acoustic Transducer (EMAT) that is used to generate Shear Horizontal (SH) guided waves in a mild steel plate. The commercial finite element package ABAQUS™ is then used to run 3D simulations to validate these experimental results. Based on these results, a planar defect study is also carried out. From all these investigations, the minimum degree of rotation of the EMAT can be set when used in a real-time ultrasonic guided wave omni-directional inspection system.
{"title":"Beam divergence calculation of an electromagnetic acoustic transducer for the Non-Destructive Evaluation of plate-like structures","authors":"Siddharth Advani, Jason K. Van Velsor, J. Rose","doi":"10.1109/SAS.2011.5739799","DOIUrl":"https://doi.org/10.1109/SAS.2011.5739799","url":null,"abstract":"Ultrasonic guided waves are now proving to be a viable method for real-world long-range Non-Destructive Evaluation (NDE) applications. In order to generate a specific guided wave mode optimally, knowledge of the sensor parameters becomes imperative. This paper attempts to experimentally measure the beam divergence in an Electro-Magnetic Acoustic Transducer (EMAT) that is used to generate Shear Horizontal (SH) guided waves in a mild steel plate. The commercial finite element package ABAQUS™ is then used to run 3D simulations to validate these experimental results. Based on these results, a planar defect study is also carried out. From all these investigations, the minimum degree of rotation of the EMAT can be set when used in a real-time ultrasonic guided wave omni-directional inspection system.","PeriodicalId":401849,"journal":{"name":"2011 IEEE Sensors Applications Symposium","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124036436","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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