Pub Date : 2004-01-01DOI: 10.1109/ICSENS.2004.1426205
D. Stoppa, L. Viarani, A. Simoni, L. Gonzo, M. Malfatti
This paper describes the design and characterization of a linear array for 3D measurements based on both multiple-pulse indirect-time-of-flight (ITOF) and optical triangulation (OT) techniques. The 128-pixel array has been fabricated in a standard 0.35-/spl mu/m, 3.3-V CMOS technology and the chip dimensions are 4.5/spl times/3.3-mm/sup 2./ The distance measurement with cooperative targets in the 2-8 m range has been successfully performed with a worst case precision better than 4 cm in the ITOF modality. Preliminary test confirmed also the validity of the OT mode, reporting a depth resolution of 100 /spl mu/m at 1 m.
本文介绍了一种基于多脉冲间接飞行时间(ITOF)和光学三角测量(OT)技术的三维测量线性阵列的设计和特性。该128像素阵列采用标准的0.35-/spl mu/m, 3.3 v CMOS技术制造，芯片尺寸为4.5/spl times/3.3 mm/sup 2。/在2-8米范围内成功地进行了合作目标的距离测量，在ITOF模式下，最坏情况下精度优于4厘米。初步测试也证实了OT模式的有效性，报告深度分辨率为100 /spl μ m /m。
{"title":"A new architecture for TOF-based range-finding sensor","authors":"D. Stoppa, L. Viarani, A. Simoni, L. Gonzo, M. Malfatti","doi":"10.1109/ICSENS.2004.1426205","DOIUrl":"https://doi.org/10.1109/ICSENS.2004.1426205","url":null,"abstract":"This paper describes the design and characterization of a linear array for 3D measurements based on both multiple-pulse indirect-time-of-flight (ITOF) and optical triangulation (OT) techniques. The 128-pixel array has been fabricated in a standard 0.35-/spl mu/m, 3.3-V CMOS technology and the chip dimensions are 4.5/spl times/3.3-mm/sup 2./ The distance measurement with cooperative targets in the 2-8 m range has been successfully performed with a worst case precision better than 4 cm in the ITOF modality. Preliminary test confirmed also the validity of the OT mode, reporting a depth resolution of 100 /spl mu/m at 1 m.","PeriodicalId":20476,"journal":{"name":"Proceedings of IEEE Sensors, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82103702","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 : 2004-01-01DOI: 10.1109/ICSENS.2004.1426292
C. Preininger, U. Sauer
Microarrays are a widely used bioanalytical tool in diagnostics, drug discovery and life science research. However, most microarrays suffer from insufficient sensitivity at low probe and target concentration and from a sometimes poor signal-to-noise ratio. This problem can be overcome by the development of 3-dimensional surfaces that provide increased immobilization capacities, by applying more sensitive detection techniques (e.g. evanescent wave technology, surface enhanced fluorescence techniques) or by using alternative labels (e.g. metal particles, quantum dots) that show a brighter luminescence and are more photostable. In our strategies for signal enhancement of protein arrays, we focus on particle arrays and Au-particles as alternative labels. Microparticles coated with IgG (immunoglobulin G) or streptavidin-IgG were arrayed in a print buffer, e.g. PBS or betaine, or a hydrogel, e.g. poly(vinyl alcohol) or pluronic polymers, on to various chip surfaces providing multiple assay replicates. 5, 10, and 40 nm Au-particles were used as labels in antibody arrays. When processing the array with fluorophor (Dy633) and Au labelled targets in different ratios, surface enhanced fluorescence was observed. The enhanced fluorescence was not only a result of the particles' size and the ratio and distance of the Dy633 and Au particles, but also the density of reactive surface groups and thus the density of bound IgG. When comparing both approaches to usual planar arrays, far higher signal-to-noise ratios could be achieved.
{"title":"Signal enhancement of protein arrays using particles","authors":"C. Preininger, U. Sauer","doi":"10.1109/ICSENS.2004.1426292","DOIUrl":"https://doi.org/10.1109/ICSENS.2004.1426292","url":null,"abstract":"Microarrays are a widely used bioanalytical tool in diagnostics, drug discovery and life science research. However, most microarrays suffer from insufficient sensitivity at low probe and target concentration and from a sometimes poor signal-to-noise ratio. This problem can be overcome by the development of 3-dimensional surfaces that provide increased immobilization capacities, by applying more sensitive detection techniques (e.g. evanescent wave technology, surface enhanced fluorescence techniques) or by using alternative labels (e.g. metal particles, quantum dots) that show a brighter luminescence and are more photostable. In our strategies for signal enhancement of protein arrays, we focus on particle arrays and Au-particles as alternative labels. Microparticles coated with IgG (immunoglobulin G) or streptavidin-IgG were arrayed in a print buffer, e.g. PBS or betaine, or a hydrogel, e.g. poly(vinyl alcohol) or pluronic polymers, on to various chip surfaces providing multiple assay replicates. 5, 10, and 40 nm Au-particles were used as labels in antibody arrays. When processing the array with fluorophor (Dy633) and Au labelled targets in different ratios, surface enhanced fluorescence was observed. The enhanced fluorescence was not only a result of the particles' size and the ratio and distance of the Dy633 and Au particles, but also the density of reactive surface groups and thus the density of bound IgG. When comparing both approaches to usual planar arrays, far higher signal-to-noise ratios could be achieved.","PeriodicalId":20476,"journal":{"name":"Proceedings of IEEE Sensors, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84363249","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 : 2004-01-01DOI: 10.1109/ICSENS.2004.1426485
L. Scalise, A. di Donato
In this paper, the authors present a non-contact 2D speckle vibrometer, which is based on an improved image processing algorithm and realized by a compact and low-cost setup. Starting from the results obtained in a previous paper (Di Donato et al. (2004)), where we demonstrated the feasibility of a method for speckle processing in the assessment velocity along one direction, we extend the study to a 2D sensor by overcoming the limits encountered previously, such as the bandwidth of the sensor and the image processing algorithm. The dynamical sensor performance is defined comparing the results with a laser Doppler vibrometer (LDVi). In addition the configuration is further simplified by introducing a low coherence source and a simpler electronic circuit.
本文提出了一种基于改进的图像处理算法的非接触式二维散斑振动仪，该振动仪结构紧凑，成本低。从之前的一篇论文(Di Donato et al.(2004))中获得的结果开始，我们展示了一种沿一个方向评估速度的散斑处理方法的可行性，我们通过克服先前遇到的限制，如传感器的带宽和图像处理算法，将研究扩展到二维传感器。通过与激光多普勒测振仪(LDVi)的比较，确定了动态传感器的性能。此外，通过引入低相干源和更简单的电子电路，进一步简化了结构。
{"title":"Non-contact 2D speckle vibrometer","authors":"L. Scalise, A. di Donato","doi":"10.1109/ICSENS.2004.1426485","DOIUrl":"https://doi.org/10.1109/ICSENS.2004.1426485","url":null,"abstract":"In this paper, the authors present a non-contact 2D speckle vibrometer, which is based on an improved image processing algorithm and realized by a compact and low-cost setup. Starting from the results obtained in a previous paper (Di Donato et al. (2004)), where we demonstrated the feasibility of a method for speckle processing in the assessment velocity along one direction, we extend the study to a 2D sensor by overcoming the limits encountered previously, such as the bandwidth of the sensor and the image processing algorithm. The dynamical sensor performance is defined comparing the results with a laser Doppler vibrometer (LDVi). In addition the configuration is further simplified by introducing a low coherence source and a simpler electronic circuit.","PeriodicalId":20476,"journal":{"name":"Proceedings of IEEE Sensors, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84506736","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 : 2004-01-01DOI: 10.1109/ICSENS.2004.1426396
X. Bao, Lufan Zou, Qinrong Yu, Liang Chen
An automated distributed sensor system based on Brillouin scattering has been developed for temperature and strain measurement. This system can provide centimetre spatial resolution for simultaneous temperature and strain sensing with strain accuracy of 10-30 /spl mu//spl epsiv/ and temperature accuracy of 1-2/spl deg/C using polarization maintained fibres (PMF) and photonic crystal fibres (PCF). We used this sensor to detect a 1.5 cm crack in an optical ground wire.
{"title":"Development and applications of the distributed temperature and strain sensors based on Brillouin scattering","authors":"X. Bao, Lufan Zou, Qinrong Yu, Liang Chen","doi":"10.1109/ICSENS.2004.1426396","DOIUrl":"https://doi.org/10.1109/ICSENS.2004.1426396","url":null,"abstract":"An automated distributed sensor system based on Brillouin scattering has been developed for temperature and strain measurement. This system can provide centimetre spatial resolution for simultaneous temperature and strain sensing with strain accuracy of 10-30 /spl mu//spl epsiv/ and temperature accuracy of 1-2/spl deg/C using polarization maintained fibres (PMF) and photonic crystal fibres (PCF). We used this sensor to detect a 1.5 cm crack in an optical ground wire.","PeriodicalId":20476,"journal":{"name":"Proceedings of IEEE Sensors, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84098960","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 : 2004-01-01DOI: 10.1109/ICSENS.2004.1426343
C. Buchheim, V. Lebedev, V. Yanev, G. Kittler, M. Fischer, G. Ecke, O. Ambacher, V. Cimalla, S. Krischok, J. Schaefer
Modifications of AlGaN surfaces have been carried out in order to tune their wetting properties. A hydrophilic surface is achieved by wet and dry thermal oxidation, whereas the deposition of fluorocarbon layers leads to a hydrophobic behaviour. It was found that both surfaces still change their properties in the first days/hours after the modification. For the fluorocarbon layers, differences are observed in dependence of the deposition method, which are explained by different ratios of the various carbon-fluorine bonds.
{"title":"Surface modifications of AlGaN/GaN sensors for water based nano- and picodroplets [chemical and biosensors]","authors":"C. Buchheim, V. Lebedev, V. Yanev, G. Kittler, M. Fischer, G. Ecke, O. Ambacher, V. Cimalla, S. Krischok, J. Schaefer","doi":"10.1109/ICSENS.2004.1426343","DOIUrl":"https://doi.org/10.1109/ICSENS.2004.1426343","url":null,"abstract":"Modifications of AlGaN surfaces have been carried out in order to tune their wetting properties. A hydrophilic surface is achieved by wet and dry thermal oxidation, whereas the deposition of fluorocarbon layers leads to a hydrophobic behaviour. It was found that both surfaces still change their properties in the first days/hours after the modification. For the fluorocarbon layers, differences are observed in dependence of the deposition method, which are explained by different ratios of the various carbon-fluorine bonds.","PeriodicalId":20476,"journal":{"name":"Proceedings of IEEE Sensors, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80190689","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 : 2004-01-01DOI: 10.1109/ICSENS.2004.1426121
L. Francis, A. Kromka, D. Steinmuller-Nethl, P. Bertrand, C. van Hoof
Nanocrystalline diamond is a promising material for the fabrication of highly sensitive flexural plate wave (FPW) sensors. The design of the FPW sensor requires the determination of the mechanical properties of a thin film membrane. In this paper we investigate the mechanical resonance of nanocrystalline diamond membranes with a stroboscopic interferometer optical system. Membranes with lateral dimensions in the range 0.8 to 6 mm and about 1 /spl mu/m thick were excited in air by a loudspeaker. The resonance frequencies helped to determine the mechanical properties of the diamond membrane and give directly the parameter of interest for the FPW sensor design. Our method allows the rapid investigation of the material without requiring an integrated transduction system and can be used to analyze structures with the actual dimensions of the FPW sensor.
{"title":"Rapid investigation of nanocrystalline diamond vibrating membranes with a stroboscopic interferometer","authors":"L. Francis, A. Kromka, D. Steinmuller-Nethl, P. Bertrand, C. van Hoof","doi":"10.1109/ICSENS.2004.1426121","DOIUrl":"https://doi.org/10.1109/ICSENS.2004.1426121","url":null,"abstract":"Nanocrystalline diamond is a promising material for the fabrication of highly sensitive flexural plate wave (FPW) sensors. The design of the FPW sensor requires the determination of the mechanical properties of a thin film membrane. In this paper we investigate the mechanical resonance of nanocrystalline diamond membranes with a stroboscopic interferometer optical system. Membranes with lateral dimensions in the range 0.8 to 6 mm and about 1 /spl mu/m thick were excited in air by a loudspeaker. The resonance frequencies helped to determine the mechanical properties of the diamond membrane and give directly the parameter of interest for the FPW sensor design. Our method allows the rapid investigation of the material without requiring an integrated transduction system and can be used to analyze structures with the actual dimensions of the FPW sensor.","PeriodicalId":20476,"journal":{"name":"Proceedings of IEEE Sensors, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80688775","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 : 2004-01-01DOI: 10.1109/ICSENS.2004.1426385
R. Ghosh, D. Osborn, G. Baker
We report on the development of an optical sensor suitable for remote monitoring of oxygen in high temperature environments. The sensor is based on /sup 3/O/sub 2/ quenching of the red emission from hexanuclear molybdenum chloride clusters. A reflection mode fiber optic probe is being developed by immobilizing Mo/sub 6/Cl/sub 12/ in a porous sol-gel matrix at the far end of a high temperature silica fiber. The sensor signal as a function of temperature was determined from in-situ spectroscopic measurements, demonstrating operation up to at least 200/spl deg/C. One of the advantages of the inorganic Mo-cluster is the lack of sensitivity to gases typically present in a coal-fired boiler due to the triplet nature of the transition from the excited to ground state.
{"title":"High temperature optical fiber oxygen probe","authors":"R. Ghosh, D. Osborn, G. Baker","doi":"10.1109/ICSENS.2004.1426385","DOIUrl":"https://doi.org/10.1109/ICSENS.2004.1426385","url":null,"abstract":"We report on the development of an optical sensor suitable for remote monitoring of oxygen in high temperature environments. The sensor is based on /sup 3/O/sub 2/ quenching of the red emission from hexanuclear molybdenum chloride clusters. A reflection mode fiber optic probe is being developed by immobilizing Mo/sub 6/Cl/sub 12/ in a porous sol-gel matrix at the far end of a high temperature silica fiber. The sensor signal as a function of temperature was determined from in-situ spectroscopic measurements, demonstrating operation up to at least 200/spl deg/C. One of the advantages of the inorganic Mo-cluster is the lack of sensitivity to gases typically present in a coal-fired boiler due to the triplet nature of the transition from the excited to ground state.","PeriodicalId":20476,"journal":{"name":"Proceedings of IEEE Sensors, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83083428","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 : 2004-01-01DOI: 10.1109/ICSENS.2004.1426106
R. Guelaz, D. Kourtiche, M. Nadi, Y. Hervé
This paper presents an ultrasonic transducer modeling with VHDL-AMS IEEE 1076 integrated in a global measurement cell modeling dedicated to biological ultrasound characterization. Conventional modeling of ultrasonic transducer is based on electrical analogy and is not simulated in the global measurement environment. The ultrasonic transducer modeling proposed is simulated with the nonlinear acoustic load and electronic excitation. The transducer is a piezoceramic element vibrating in thickness mode. The theoretical equations of piezoelectricity are used to determine a matrix transfer which describes the relation between the electrical and the acoustical parts. The temporal implementation is based on the Redwood's model. Characterization of different mediums like water and ethanol with a compared method is based on the B/A ultrasonic parameter estimation. The good results obtained for temporal simulation and B/A nonlinear parameter estimation compared to measurements show that we can extended to a multi-layer characterization with an ultrasonic nonlinear imaging probe modeling.
{"title":"Ultrasonic piezoceramic transducer modeling with VHDL-AMS IEEE 1076.1","authors":"R. Guelaz, D. Kourtiche, M. Nadi, Y. Hervé","doi":"10.1109/ICSENS.2004.1426106","DOIUrl":"https://doi.org/10.1109/ICSENS.2004.1426106","url":null,"abstract":"This paper presents an ultrasonic transducer modeling with VHDL-AMS IEEE 1076 integrated in a global measurement cell modeling dedicated to biological ultrasound characterization. Conventional modeling of ultrasonic transducer is based on electrical analogy and is not simulated in the global measurement environment. The ultrasonic transducer modeling proposed is simulated with the nonlinear acoustic load and electronic excitation. The transducer is a piezoceramic element vibrating in thickness mode. The theoretical equations of piezoelectricity are used to determine a matrix transfer which describes the relation between the electrical and the acoustical parts. The temporal implementation is based on the Redwood's model. Characterization of different mediums like water and ethanol with a compared method is based on the B/A ultrasonic parameter estimation. The good results obtained for temporal simulation and B/A nonlinear parameter estimation compared to measurements show that we can extended to a multi-layer characterization with an ultrasonic nonlinear imaging probe modeling.","PeriodicalId":20476,"journal":{"name":"Proceedings of IEEE Sensors, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83211517","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 : 2004-01-01DOI: 10.1109/ICSENS.2004.1426355
Jiong Li, Chen Xu, Zhikuan Zhang, Yijin Wang, H. Peng, Zuhong Lu, M. Chan
We propose a silicon integrated circuit (IC) compatible DNA detection platform based on the interaction of self-assembled nano-metallic particles and ordinary visible light. The DNA hybridization initiates the formation of an opaque area at the surface of the support. A photodiode array fabricated underneath the supporting surface can then be used to detect the light intensity changes before and after the assembly of the nano-particle; the signal can be further amplified by silver enhancement.
{"title":"DNA detection by self-assembled nano-particle and integrated photodiodes","authors":"Jiong Li, Chen Xu, Zhikuan Zhang, Yijin Wang, H. Peng, Zuhong Lu, M. Chan","doi":"10.1109/ICSENS.2004.1426355","DOIUrl":"https://doi.org/10.1109/ICSENS.2004.1426355","url":null,"abstract":"We propose a silicon integrated circuit (IC) compatible DNA detection platform based on the interaction of self-assembled nano-metallic particles and ordinary visible light. The DNA hybridization initiates the formation of an opaque area at the surface of the support. A photodiode array fabricated underneath the supporting surface can then be used to detect the light intensity changes before and after the assembly of the nano-particle; the signal can be further amplified by silver enhancement.","PeriodicalId":20476,"journal":{"name":"Proceedings of IEEE Sensors, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81455835","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 : 2004-01-01DOI: 10.1109/ICSENS.2004.1426183
S. Chopra, S. Natarajan, A. Rao
We present the design and development of a highly sensitive and fast response microwave resonant sensor for monitoring the presence of gases present in the environment. The sensor consists of a circular disk electromagnetic resonant circuit coated with multi/single-walled carbon nanotubes that are highly sensitive to adsorbed gas molecules. Trace amounts (ppb) of gases or organic solvent vapors (polar or non-polar) can be detected with high selectivity and sensitivity. The enhanced sensing properties result from a change in the effective dielectric properties of the resonator when exposed to different gas environments. In general, the resonant frequency shifts scale accordingly with the dielectric constants of the gases under test and the recovery and response times are <10 minutes. Importantly, our sensing platform does not require functionalized carbon nanotubes to enhance specificity, or wire connection to the nanotubes, making it attractive for remote sensor technology.
{"title":"Gas sensing using carbon nanotube-based resonator","authors":"S. Chopra, S. Natarajan, A. Rao","doi":"10.1109/ICSENS.2004.1426183","DOIUrl":"https://doi.org/10.1109/ICSENS.2004.1426183","url":null,"abstract":"We present the design and development of a highly sensitive and fast response microwave resonant sensor for monitoring the presence of gases present in the environment. The sensor consists of a circular disk electromagnetic resonant circuit coated with multi/single-walled carbon nanotubes that are highly sensitive to adsorbed gas molecules. Trace amounts (ppb) of gases or organic solvent vapors (polar or non-polar) can be detected with high selectivity and sensitivity. The enhanced sensing properties result from a change in the effective dielectric properties of the resonator when exposed to different gas environments. In general, the resonant frequency shifts scale accordingly with the dielectric constants of the gases under test and the recovery and response times are <10 minutes. Importantly, our sensing platform does not require functionalized carbon nanotubes to enhance specificity, or wire connection to the nanotubes, making it attractive for remote sensor technology.","PeriodicalId":20476,"journal":{"name":"Proceedings of IEEE Sensors, 2004.","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82500953","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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