Pub Date : 2013-05-06DOI: 10.1109/I2MTC.2013.6555408
M. Faifer, R. Ottoboni, S. Toscani, C. Cherbaucich, M. Gentili, P. Mazza
The importance of power quality monitoring in medium voltage (MV) systems has dramatically increased in the last years. It is well known that a measurement system with wide bandwidth and very low distortion is mandatory for this purpose. Usually, the performance bottlenecks are the transducers which have to be carefully selected according to the required accuracy. Therefore, it is very important to test them in real-world (nonsinusoidal) operating conditions. However, the characterization requires generating arbitrary voltage waveforms with amplitude of several kilovolts. This paper proposes a very simple MV waveform generator employing basic instrumentation which is very common in calibration laboratories. It consists in an arbitrary waveform generator (AWG) connected to a power amplifier which feeds the low voltage winding of a step up transformer. The secondary, high voltage winding is attached to a reference voltage transducer and to the device under test. In general, the shape of the secondary voltage waveform can be very different from the reference voltage of the signal generator. However, assuming that the nonlinearities of the system are negligible, it is possible to estimate the transfer function between the reference voltage of the signal generator and the secondary voltage. Then, it is possible to compute the reference voltage for the AWG in order to obtain the desired secondary voltage waveform. This technique has been implemented and its performance has been tested. The experimental activity has shown that an accuracy of a few percent can be easily achieved.
{"title":"A medium voltage signal generator for the testing of voltage measurement transducers","authors":"M. Faifer, R. Ottoboni, S. Toscani, C. Cherbaucich, M. Gentili, P. Mazza","doi":"10.1109/I2MTC.2013.6555408","DOIUrl":"https://doi.org/10.1109/I2MTC.2013.6555408","url":null,"abstract":"The importance of power quality monitoring in medium voltage (MV) systems has dramatically increased in the last years. It is well known that a measurement system with wide bandwidth and very low distortion is mandatory for this purpose. Usually, the performance bottlenecks are the transducers which have to be carefully selected according to the required accuracy. Therefore, it is very important to test them in real-world (nonsinusoidal) operating conditions. However, the characterization requires generating arbitrary voltage waveforms with amplitude of several kilovolts. This paper proposes a very simple MV waveform generator employing basic instrumentation which is very common in calibration laboratories. It consists in an arbitrary waveform generator (AWG) connected to a power amplifier which feeds the low voltage winding of a step up transformer. The secondary, high voltage winding is attached to a reference voltage transducer and to the device under test. In general, the shape of the secondary voltage waveform can be very different from the reference voltage of the signal generator. However, assuming that the nonlinearities of the system are negligible, it is possible to estimate the transfer function between the reference voltage of the signal generator and the secondary voltage. Then, it is possible to compute the reference voltage for the AWG in order to obtain the desired secondary voltage waveform. This technique has been implemented and its performance has been tested. The experimental activity has shown that an accuracy of a few percent can be easily achieved.","PeriodicalId":432388,"journal":{"name":"2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129955167","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 : 2013-05-06DOI: 10.1109/I2MTC.2013.6555522
Matteo Bertocco, G. Giorgi, C. Narduzzi
Sensor networks need a common timescale to be shared among their constituent elements. Accuracy and reliability are key issues in time dissemination, the latter aspect being specifically addressed in several synchronization schemes. In the paper, we present an approach to reliability assessment based on monitoring the innovation of the Kalman filter employed as the local clock servo in a sensor node. The assumed clock model is described by two state variables and its equations are general enough for most typical devices and operating conditions. Results provided demonstrate the capability to detect unreliable time information, thus improving synchronization performances.
{"title":"Innovation-based timestamp validation for reliable sensor network synchronization","authors":"Matteo Bertocco, G. Giorgi, C. Narduzzi","doi":"10.1109/I2MTC.2013.6555522","DOIUrl":"https://doi.org/10.1109/I2MTC.2013.6555522","url":null,"abstract":"Sensor networks need a common timescale to be shared among their constituent elements. Accuracy and reliability are key issues in time dissemination, the latter aspect being specifically addressed in several synchronization schemes. In the paper, we present an approach to reliability assessment based on monitoring the innovation of the Kalman filter employed as the local clock servo in a sensor node. The assumed clock model is described by two state variables and its equations are general enough for most typical devices and operating conditions. Results provided demonstrate the capability to detect unreliable time information, thus improving synchronization performances.","PeriodicalId":432388,"journal":{"name":"2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128540342","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 : 2013-05-06DOI: 10.1109/I2MTC.2013.6555526
A. V. Mulders, L. Vanbeylen
In many measurement applications, highly accurate models are needed. Linear models can fail to represent the measured phenomena in a satisfactory way. In the class of nonlinear dynamic models, a nonlinear state-space model is an attractive option due to its good modelling capabilities. In order to obtain optimal results with this model, good initial estimates for the nonconvex optimisation problem are crucial. We show that the classical approach (via the best linear approximation) can get trapped in local minima and we present some alternative, recently developed, initialisation methods (nonlinear models). A simulation example is used to compare their performance, and the results (including time-efficiency and flexibility) are discussed.
{"title":"Comparison of some initialisation methods for the identification of nonlinear state-space models","authors":"A. V. Mulders, L. Vanbeylen","doi":"10.1109/I2MTC.2013.6555526","DOIUrl":"https://doi.org/10.1109/I2MTC.2013.6555526","url":null,"abstract":"In many measurement applications, highly accurate models are needed. Linear models can fail to represent the measured phenomena in a satisfactory way. In the class of nonlinear dynamic models, a nonlinear state-space model is an attractive option due to its good modelling capabilities. In order to obtain optimal results with this model, good initial estimates for the nonconvex optimisation problem are crucial. We show that the classical approach (via the best linear approximation) can get trapped in local minima and we present some alternative, recently developed, initialisation methods (nonlinear models). A simulation example is used to compare their performance, and the results (including time-efficiency and flexibility) are discussed.","PeriodicalId":432388,"journal":{"name":"2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128646217","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 : 2013-05-06DOI: 10.1109/I2MTC.2013.6555540
Chang Liu, Lijun Xu, Z. Cao
In this paper, single view fan-beam tomography using tunable diode laser absorption spectroscopy (TDLAS) is introduced for measuring axisymmetric temperature distribution. Generated by a well-collimated laser through a cylindrical lens, the fan beam laser crosses the target region and is detected by seven photodiode receivers. Under the condition of axisymmetric temperature and gas concentration distribution, the same data sets from the given view can be used for other views. For typical temperature distribution in confined combustion flow, two-dimensional image is reconstructed using algebraic reconstruction technique (ART). Given the 2% measurement error of the data, the mean error between the original temperature distribution and the reconstructed one is less than 5%, which validates the feasibility of this approach.
{"title":"Measurement of axisymmetric temperature distributions using single view fan-beam TDLAS tomography","authors":"Chang Liu, Lijun Xu, Z. Cao","doi":"10.1109/I2MTC.2013.6555540","DOIUrl":"https://doi.org/10.1109/I2MTC.2013.6555540","url":null,"abstract":"In this paper, single view fan-beam tomography using tunable diode laser absorption spectroscopy (TDLAS) is introduced for measuring axisymmetric temperature distribution. Generated by a well-collimated laser through a cylindrical lens, the fan beam laser crosses the target region and is detected by seven photodiode receivers. Under the condition of axisymmetric temperature and gas concentration distribution, the same data sets from the given view can be used for other views. For typical temperature distribution in confined combustion flow, two-dimensional image is reconstructed using algebraic reconstruction technique (ART). Given the 2% measurement error of the data, the mean error between the original temperature distribution and the reconstructed one is less than 5%, which validates the feasibility of this approach.","PeriodicalId":432388,"journal":{"name":"2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128935218","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 : 2013-05-06DOI: 10.1109/I2MTC.2013.6555381
H. Tsai, Kuo-Cheng Huang, Han-Chao Chang, Chung-Hsing Chang
Under the irradiation of lights of two different wavelengths, the skin image of human hand can be obtained and roughly applied to construct the oxygen saturation image of skin tissue. The penetration (skin) depth of incident light increases with increasing wavelength between 350 to 1000 nm, and the deoxy-hemoglobin (Hb) and oxy-hemoglobin (HbO2) has a relatively high absorptivity in visible and near-infrared (NIR) spectrum, respectively; therefore, the intensity of diffuse reflected images of skin can be used to compute the oxygen saturation images of skin tissue. In the experiment, three LED light sources (red - 660 nm, NIR - 890 and 940 nm) were applied to construct the oxygen saturation images of skin tissue. The experiments show the oxygen saturation ranging from 84.69 to 88.79 % at the wrist and from 78.09 to 81.81 % at the back of hand when the skin tissue is irradiated by 660 and 890 nm LED light. The results not only could provide the distribution of oxygen saturation but also similar to the multi-spectral imaging method. In the future, the above result can be compared to that of transcutaneous oxygen pressure measurement (TcPO2), and provide a good reference to build the relationship between the oxygen saturation and healthy index for cardiovascular system in clinical diagnosis.
{"title":"A study on oxygen saturation images constructed from the skin tissue of human hand","authors":"H. Tsai, Kuo-Cheng Huang, Han-Chao Chang, Chung-Hsing Chang","doi":"10.1109/I2MTC.2013.6555381","DOIUrl":"https://doi.org/10.1109/I2MTC.2013.6555381","url":null,"abstract":"Under the irradiation of lights of two different wavelengths, the skin image of human hand can be obtained and roughly applied to construct the oxygen saturation image of skin tissue. The penetration (skin) depth of incident light increases with increasing wavelength between 350 to 1000 nm, and the deoxy-hemoglobin (Hb) and oxy-hemoglobin (HbO2) has a relatively high absorptivity in visible and near-infrared (NIR) spectrum, respectively; therefore, the intensity of diffuse reflected images of skin can be used to compute the oxygen saturation images of skin tissue. In the experiment, three LED light sources (red - 660 nm, NIR - 890 and 940 nm) were applied to construct the oxygen saturation images of skin tissue. The experiments show the oxygen saturation ranging from 84.69 to 88.79 % at the wrist and from 78.09 to 81.81 % at the back of hand when the skin tissue is irradiated by 660 and 890 nm LED light. The results not only could provide the distribution of oxygen saturation but also similar to the multi-spectral imaging method. In the future, the above result can be compared to that of transcutaneous oxygen pressure measurement (TcPO2), and provide a good reference to build the relationship between the oxygen saturation and healthy index for cardiovascular system in clinical diagnosis.","PeriodicalId":432388,"journal":{"name":"2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129095038","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 : 2013-05-06DOI: 10.1109/I2MTC.2013.6555644
Guillem Casas Barcelo, G. Panahandeh, M. Jansson
This paper presents a floor segmentation algorithm for indoor sequences that works with single grey-scale images. The portion of the floor closest to the camera is segmented by judiciously joining a set of horizontal and vertical lines, previously detected. Since the proposed method is not based on computing the vanishing point, the system can deal with any kind of indoor scenes and adapts quickly to camera movements. A second contribution is the detection of moving features for points within the segmented floor area. Based on the estimated camera ego-motion, the ground plane homography is derived. Then, the expected optical flow for the ground points is calculated and used for rejecting features that belong to moving obstacles. A key point of the designed method is that no restrictions on the camera motion are imposed for the homography derivation.
{"title":"Image-based floor segmentation in visual inertial navigation","authors":"Guillem Casas Barcelo, G. Panahandeh, M. Jansson","doi":"10.1109/I2MTC.2013.6555644","DOIUrl":"https://doi.org/10.1109/I2MTC.2013.6555644","url":null,"abstract":"This paper presents a floor segmentation algorithm for indoor sequences that works with single grey-scale images. The portion of the floor closest to the camera is segmented by judiciously joining a set of horizontal and vertical lines, previously detected. Since the proposed method is not based on computing the vanishing point, the system can deal with any kind of indoor scenes and adapts quickly to camera movements. A second contribution is the detection of moving features for points within the segmented floor area. Based on the estimated camera ego-motion, the ground plane homography is derived. Then, the expected optical flow for the ground points is calculated and used for rejecting features that belong to moving obstacles. A key point of the designed method is that no restrictions on the camera motion are imposed for the homography derivation.","PeriodicalId":432388,"journal":{"name":"2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123362745","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 : 2013-05-06DOI: 10.1109/I2MTC.2013.6555372
N. Suryadevara, S. Mukhopadhyay, R. Wang, R. Rayudu, Y. M. Huang
In this paper, we present an engineering system for monitoring and forecasting wellness of an elderly person in relation to performance of daily activities. Complex behavioural changes of daily activities are captured in real time for reliable measurement of wellness operations. These tasks are realized with the sensor status of the household objects in use by the elderly in combination with prediction process of time series data processing algorithm. This will assist in determining the quantitative well-being of an elderly and alert if the daily activity behaviour is irregular.
{"title":"Reliable measurement of Wireless Sensor Network data for forecasting wellness of elderly at smart home","authors":"N. Suryadevara, S. Mukhopadhyay, R. Wang, R. Rayudu, Y. M. Huang","doi":"10.1109/I2MTC.2013.6555372","DOIUrl":"https://doi.org/10.1109/I2MTC.2013.6555372","url":null,"abstract":"In this paper, we present an engineering system for monitoring and forecasting wellness of an elderly person in relation to performance of daily activities. Complex behavioural changes of daily activities are captured in real time for reliable measurement of wellness operations. These tasks are realized with the sensor status of the household objects in use by the elderly in combination with prediction process of time series data processing algorithm. This will assist in determining the quantitative well-being of an elderly and alert if the daily activity behaviour is irregular.","PeriodicalId":432388,"journal":{"name":"2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121418911","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 : 2013-05-06DOI: 10.1109/I2MTC.2013.6555655
Binqiang Chen, Zhousuo Zhang, Jie Zhang, Zhibo Yang, Zhengjia He
This paper investigates a novel wavelet tight frame (WTF) constructing strategy for obtaining pseudo second generation bases with non-dyadic time-frequency partition grids. The proposed constructing strategy starts with a known second generation wavelet basis and applies it in an undecimated filterbank. Via forward and inverse transformation procedure, an input signal is decomposed into a set of dyadic wavelet packets. By introducing a systematic way of wavelet packet reordering and ensemble wavelet generating method, another corresponding set of non-dyadic wavelet packets are generated. It is demonstrated that the derived pseudo non-dyadic second generation wavelet packets (PNSGW) are associated with well-defined band-pass filters, which ensure good time-frequency localizability and exact shift-invariance. The PNSGW strategy is combined with spectral kurtosis to detect incipient faults in mechanical systems. The processing results show that the proposed technique is a well complement to conventional dyadic wavelet transform in investigating transient impulse responses caused by faulty mechanical components.
{"title":"Pseudo non-dyadic second generation wavelet tight frame for machine fault diagnosis","authors":"Binqiang Chen, Zhousuo Zhang, Jie Zhang, Zhibo Yang, Zhengjia He","doi":"10.1109/I2MTC.2013.6555655","DOIUrl":"https://doi.org/10.1109/I2MTC.2013.6555655","url":null,"abstract":"This paper investigates a novel wavelet tight frame (WTF) constructing strategy for obtaining pseudo second generation bases with non-dyadic time-frequency partition grids. The proposed constructing strategy starts with a known second generation wavelet basis and applies it in an undecimated filterbank. Via forward and inverse transformation procedure, an input signal is decomposed into a set of dyadic wavelet packets. By introducing a systematic way of wavelet packet reordering and ensemble wavelet generating method, another corresponding set of non-dyadic wavelet packets are generated. It is demonstrated that the derived pseudo non-dyadic second generation wavelet packets (PNSGW) are associated with well-defined band-pass filters, which ensure good time-frequency localizability and exact shift-invariance. The PNSGW strategy is combined with spectral kurtosis to detect incipient faults in mechanical systems. The processing results show that the proposed technique is a well complement to conventional dyadic wavelet transform in investigating transient impulse responses caused by faulty mechanical components.","PeriodicalId":432388,"journal":{"name":"2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121464561","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 : 2013-05-06DOI: 10.1109/I2MTC.2013.6555631
Luís Filipe Soldado Granadeiro Rosado, M. Piedade, Tiago Catarrunas, P. Ramos
In this paper, a real-time Digital Signal Processing (DSP) architecture is proposed to generate and process multi-frequency signals for eddy currents testing. This architecture was implemented on a dedicated instrument whose processing core is a Field-Programmable Gate Array (FPGA) for DSP purposes. Stimulus generation is achieved using Direct Digital Synthesis (DDS) with some improvements to remove spurious frequency components. An In-phase and Quadrature (IQ) demodulation scheme is implemented to estimate the real and imaginary part of the probes output signals. A Cascaded Integrator Comb (CIC) decimator is used to lower the sampling frequency allowing narrowband IIR filtering using low resources. The proposed architecture is able to generate and process the stimulus and input data at 125 MSamples/s and to estimate the input data components at 1.25 MSamples/s rate for frequencies between 50 kHz and 10 MHz.
{"title":"Real-time processing of multi-frequency eddy currents testing signals","authors":"Luís Filipe Soldado Granadeiro Rosado, M. Piedade, Tiago Catarrunas, P. Ramos","doi":"10.1109/I2MTC.2013.6555631","DOIUrl":"https://doi.org/10.1109/I2MTC.2013.6555631","url":null,"abstract":"In this paper, a real-time Digital Signal Processing (DSP) architecture is proposed to generate and process multi-frequency signals for eddy currents testing. This architecture was implemented on a dedicated instrument whose processing core is a Field-Programmable Gate Array (FPGA) for DSP purposes. Stimulus generation is achieved using Direct Digital Synthesis (DDS) with some improvements to remove spurious frequency components. An In-phase and Quadrature (IQ) demodulation scheme is implemented to estimate the real and imaginary part of the probes output signals. A Cascaded Integrator Comb (CIC) decimator is used to lower the sampling frequency allowing narrowband IIR filtering using low resources. The proposed architecture is able to generate and process the stimulus and input data at 125 MSamples/s and to estimate the input data components at 1.25 MSamples/s rate for frequencies between 50 kHz and 10 MHz.","PeriodicalId":432388,"journal":{"name":"2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124022829","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 : 2013-05-06DOI: 10.1109/I2MTC.2013.6555663
A. Syaifudin, P. Yu, S. Mukhopadhyay, C. Gooneratne, J. Kosel
New types of planar interdigital sensors have been fabricated on Silicon/Silicon Dioxide (Si/SiO2) wafers. The sensors were coated with pre-cursor silica functionalized with APTES (3-aminopropyltrietoxysilane) at different thicknesses. All sensors were then immobilized with Polymyxin, B (PmB). PmB is an antimicrobial peptide produced by the Gram-positive bacterium-Bacillus, has been immobilized on the coated sensors because of its specific binding properties to endotoxin. Studies were conducted to analyze the effect of different thicknesses of coatings on the sensitivity and selectivity of the sensors. It was observed sensors coated with 3 layers of coating has better sensitivity and selectivity to the target molecules (endotoxin) compared to sensors with 5 layers of coating. The repeatability and stability of the coated sensors were tested by multiple standard endotoxin measurement and it was observed that the sensors give a good reproducibility and stability up to six continuous measurements before the coating degrades.
{"title":"Analysis of different coating thickness on new type of planar interdigital sensors for endotoxin detection","authors":"A. Syaifudin, P. Yu, S. Mukhopadhyay, C. Gooneratne, J. Kosel","doi":"10.1109/I2MTC.2013.6555663","DOIUrl":"https://doi.org/10.1109/I2MTC.2013.6555663","url":null,"abstract":"New types of planar interdigital sensors have been fabricated on Silicon/Silicon Dioxide (Si/SiO2) wafers. The sensors were coated with pre-cursor silica functionalized with APTES (3-aminopropyltrietoxysilane) at different thicknesses. All sensors were then immobilized with Polymyxin, B (PmB). PmB is an antimicrobial peptide produced by the Gram-positive bacterium-Bacillus, has been immobilized on the coated sensors because of its specific binding properties to endotoxin. Studies were conducted to analyze the effect of different thicknesses of coatings on the sensitivity and selectivity of the sensors. It was observed sensors coated with 3 layers of coating has better sensitivity and selectivity to the target molecules (endotoxin) compared to sensors with 5 layers of coating. The repeatability and stability of the coated sensors were tested by multiple standard endotoxin measurement and it was observed that the sensors give a good reproducibility and stability up to six continuous measurements before the coating degrades.","PeriodicalId":432388,"journal":{"name":"2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127696176","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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