On the temperature dependent characteristics of a photoacoustic water vapor detector for airborne application |
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| Institution: | 1. Department of Optics and Quantum Electronics, University of Szeged, H-6701 Pf. 406 Szeged, Hungary;2. Research Group on Laser Physics of the Hungarian Academy of Sciences, H-6701 Pf. 406 Szeged, Hungary;1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, PR China;2. Engineering Ceramics Key Laboratory of Shandong Province, Shandong University, Jinan 250061, PR China;1. Sensorik-Applikationszentrum (SappZ) der Ostbayerischen Technischen Hochschule (OTH) Regensburg, 93053 Regensburg, Germany;2. Universität Regensburg, 93053 Regensburg, Germany;1. Departament of Neurotoxicology, Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland;2. Department of Experimental and Clinical Pharmacology, Medical University, Lublin, Poland;3. University of Tampere Medical School, Tampere, Finland;1. Centro de Investigaciones en Láseres y Aplicaciones CEILAP (CITEDEF-CONICET), Juan Bautista de La Salle 4397, B1603ALO Villa Martelli, Argentina;2. GLOMAE, Facultad de Ingeniería, Universidad de Buenos Aires, Paseo Colón 850, C1063ACV Buenos Aires, Argentina |
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| Abstract: | A detailed study on the temperature dependent sensitivity of a wavelength modulated diode laser based photoacoustic (PA) water vapor detection system is presented. The temperature dependence of the resonance frequency, the Q-factor of the resonator, the microphone sensitivity and the response time is investigated. It is shown that the overall temperature dependent sensitivity of the system is primarily determined by the temperature dependence of the microphone sensitivity. Effort was made to improve the system’s accuracy for measurements under varying ambient temperature typical in airborne applications, while maintaining the fast response time of the PA system. For this purpose a wavelength-stabilization method is introduced, with which the wavelength instability of the laser can be decreased to be as low as 0.008 nm. Test measurements proved the feasibility of the implementation of the wavelength locking method within the framework of the CARIBIC (civil aircraft for the regular investigation of the atmosphere based on an instrument container) project. |
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