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Keywords = all-optical PA sensor

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17 pages, 7318 KB  
Article
An all-Optical Photoacoustic Sensor for the Detection of Trace Gas
by Thomas Lauwers, Alain Glière and Skandar Basrour
Sensors 2020, 20(14), 3967; https://doi.org/10.3390/s20143967 - 16 Jul 2020
Cited by 32 | Viewed by 5873
Abstract
A highly sensitive Fabry–Perot based transduction method is proposed as an all-optical alternative for the detection of trace gas by the photoacoustic spectroscopy technique. A lumped element model is firstly devised to help design the whole system and is successfully compared to finite [...] Read more.
A highly sensitive Fabry–Perot based transduction method is proposed as an all-optical alternative for the detection of trace gas by the photoacoustic spectroscopy technique. A lumped element model is firstly devised to help design the whole system and is successfully compared to finite element method simulations. The fabricated Fabry–Perot microphone consists in a hinged cantilever based diaphragm, processed by laser cutting, and directly assembled at the tip of an optical fiber. We find a high acoustic sensitivity of 630 mV/Pa and a state-of-the-art noise equivalent pressure, as low as ~   2   μ Pa / Hz at resonance. 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 proposed optical trace gas sensor offers the advantages of high sensitivity and easy assembling, as well as the possibility of remote detection. Full article
(This article belongs to the Section Optical Sensors)
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9 pages, 326 KB  
Article
All-Optical Frequency Modulated High Pressure MEMS Sensor for Remote and Distributed Sensing
by Kasper Reck, Erik V. Thomsen and Ole Hansen
Sensors 2011, 11(11), 10615-10623; https://doi.org/10.3390/s111110615 - 8 Nov 2011
Cited by 2 | Viewed by 7235
Abstract
We present the design, fabrication and characterization of a new all-optical frequency modulated pressure sensor. Using the tangential strain in a circular membrane, a waveguide with an integrated nanoscale Bragg grating is strained longitudinally proportional to the applied pressure causing a shift in [...] Read more.
We present the design, fabrication and characterization of a new all-optical frequency modulated pressure sensor. Using the tangential strain in a circular membrane, a waveguide with an integrated nanoscale Bragg grating is strained longitudinally proportional to the applied pressure causing a shift in the Bragg wavelength. The simple and robust design combined with the small chip area of 1 × 1.8 mm2 makes the sensor ideally suited for remote and distributed sensing in harsh environments and where miniaturized sensors are required. The sensor is designed for high pressure applications up to 350 bar and with a sensitivity of 4.8 pm/bar (i.e., 350 ×105 Pa and 4.8 × 10−5 pm/Pa, respectively). Full article
(This article belongs to the Section Physical Sensors)
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