Chen, K.; Zhang, B.; Liu, S.; Yu, Q. Parts-per-billion-level detection of hydrogen sulfide based on near-infrared all-optical photoacoustic spectroscopy. Ma, Y.; Qiao, S.; He, Y.; Li, Y.; Zhang, Z.; Yu, X.; Tittel, F.K. The Chillgard LE Photoacoustic Infrared Refrigerant Monitor is specifically designed for reliable detection of some of the most common refrigerants from up to four remote locations—with a minimum detection level of 20 ppm. those of the individual authors and contributors and not of the publisher and the editor(s). The use of polyvinylidene fluoride film as transducer for photoacoustic signal sensing offers good flexibility, water resistance, chemical stability and low cost for applications under harsh or/and specific environmental conditions. 30 ml The gas exchange procedure is user configurable by a simple user interface with display and buttons. His research interests include atmospheric molecules absorption spectroscopy, high sensitive diode laser spectroscopy and application. The sensor consists of a miniaturized innovative photoacoustic sensor unit with integrated electronics. The sensor (1) has a measuring cell (2), a lamp (3), a photodiode (17), a gas permeable membrane (7) and a microphone (6). According to Equations (1)–(5), the magnitude of the generated PA pressure is nearly inversely proportional to the square of the inner radius of the PA cavity. Homemade circuits are integrated into the sensor for laser diode driving and signal processing. ; software, Y.C., M.G., H.D., and S.L. and Q.Y. The sensor performance was evaluated by detection of water vapor in ambient air at nor-mal atmospheric pressure. ; Babikov, Y.; Barbe, A.; Benner, D.C.; Bernath, P.F. Compact TDLAS based optical sensor for ppb-level ethane detection by use of a 3.34 μm room-temperature CW interband cascade laser. The sensor was calibrated by using a chemiluminescence NO–NO2–NOX gas analyzer. A proof-of-concept of an innovative PAS gas sensor based on a polyvinylidene fluoride (PVDF) film was introduced. Peltola, J.; Vainio, M.; Hieta, T.; Uotila, J.; Sinisalo, S.; Metsälä, M.; Halonen, L. High sensitivity trace gas detection by cantilever-enhanced photoacoustic spectroscopy using a mid-infrared continuous-wave optical parametric oscillator. A photoacoustic cell, equipped with a highly sensitive cantilever pressure sensor, was used as a selective detector for broadband IR-radiation passed through the sample gas. ; writing—review and editing, K.C., Y.C., B.Z., L.M., M.G., H.D., S.L., F.M., Z.G. Zheng, H.; Lou, M.; Dong, L.; Wu, H.; Ye, W.; Yin, X.; Canedy, C.L. Gas pressure was set to 0.35 bar at which our sensor provides an optimal PA signal. Compact photoacoustic module for methane detection incorporating interband cascade light emitting device. He obtained his State PhD (HDR) in 2001 and became full Professor of University of Sciences & Technologies of Lille in 2003. Xiaoming Gao is Professor at Anhui Institute of Optics & Fine Mechanics, Chinese Academy of Sciences. A ppb-level photoacoustic multicomponent gas sensor system for sulfur hexafluoride (SF6) decomposition detection was developed by the use of two near-infrared (NIR) diode lasers and an ultraviolet (UV) solid-state laser. photoacoustic sensor photoacoustic sensor Prior art date 2010-10-28 Legal status (The legal status is an assumption and is not a legal conclusion. Gas could diffuse into the stainless-steel PA microcavity from two holes. The bufier gases used in these two applications are extremely difierent and have a very important impact on the calibration of the photoacoustic sensor. The sensor head contains an extrinsic FP cavity, which is formed by a ceramic ferrule, a titanium diaphragm, and an air micro-chamber. Parvitte, B.; Risser, C.; Vallon, R.; Zéninari, V. Quantitative simulation of photoacoustic signals using finite element modelling software. In an arrangement where a sensor is placed in a gaseous phase above the sample and the light impinges the sample from above, the photoacoustic signal results from an absorption zone close to the surface. Withdrawn Application number EP10859075.3A Other languages German (de) French (fr) In such a PVDF-based photoacoustic spectroscopy (PVDF-PAS) approach, the PVDF film plays a role both as a cantilever used in cantilever-enhanced photoacoustic spectroscopy and as a piezoelectric quartz tuning fork used in quartz-enhanced photo-acoustic spectroscopy. A DFB laser operating at 1650.96 nm was used to detect CH. ; supervision, K.C. 5. For photoacoustic trace gas detection, the Fabry–Perot microphone is further embedded in a cylindrical multipass cell and shows an ultimate detection limit of 15 ppb of NO in nitrogen. The statements, opinions and data contained in the journals are solely The volume of the cavity in the sensor was only 7.9 μL. Weidong Chen received his PhD from the University of Sciences & Technologies of Lille (France) in 1991. Highly sensitive photoacoustic gas sensor based on multiple reflections on the cell wall. To reduce the size of the PA cavity as much as possible to shorten the response time without increasing the processing difficulty, the inner radius of the stainless-steel cylindrical cavity was set to 0.5 mm. ; data curation, Y.C. Besides the automotive sector, consumer markets with air quality applications also require a huge number of cheap devices. Schilt [, In summary, a PA microcavity sensor was proposed and developed for gas leak detection with the advantages of high sensitivity, low power, and low cost. He received his Ph.D degree from Anhui Institute of Optics & Fine Mechanics, Chinese Academy Sciences in 1998. 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