Abstract
We present a first demonstration of photo-thermal detection of NO gas particles in a configuration using a 5.2 μm QCL as an excitation source and a simple fiber interferometer for probing the induced refractive index changes. The photo-thermal approach to laser gas spectroscopy is to a certain degree similar to the photo-acoustic technique [2]. Photo-thermal effect can be observed after exciting gas molecules with a radiation source. The process of relaxation to the ground state, either through emission of photons, or by means of non-radiative processes, results in a local temperature increase in the sampled gas and, subsequently, in the change of the gas refractive index. Detecting these refractive index changes can be used to retrieve the information on the target analyte concentration. The proposed sensing approach offers significant flexibility while designing the sensor, due to the fact that the excitation and the probing laser source can be chosen independently, to exploit their particular advantages. The system setup used to detect NO gas particles is presented in Fig. 1.
© 2017 IEEE
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