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Multichannel Raman gas analyzer: the data acquisition and control system. Measurement improvement with blue laser light

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6 Author(s)
Papageorgas, P.G. ; Dept. of Informatics & Telecommun., Univ. of Athens, Greece ; Maroulis, D. ; Winter, H. ; Karkanis, S.A.
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In this paper, the data acquisition and control system of a multichannel Raman effect-based gas analysis device is presented, together with the improvements achieved in measurement of gas concentration sensitivities as a result of the operation of the system with a new blue laser-light source. The multichannel Raman gas sensor (MRGS) is based on the linear Raman scattering effect and uses photo multiplier tubes (PMTs) in the photon-counting mode of operation. An embedded microcontroller-based data acquisition and control (MDAC) system collects, digitizes, processes, and stores in real time the data from six photon-counting modules and the accompanying sensors, along with an overall system control through appropriate actuators. Recent advances in the development of solid-state laser sources have enabled the use of a new, state-of-the-art, blue laser for the excitation of the Raman effect. Using this blue laser source, improvements in the sensitivities in measurements of concentration for all tested gases (SO2, CO2, CO, NO2, C6H6, and N2) have been substantiated, compared with the green laser source previously used and reported in a related article.

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Instrumentation and Measurement, IEEE Transactions on  (Volume:53 ,  Issue: 1 )