Optics and Spectroscopy
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- 2022
Experimental implementation of a spectral refractive index sensor based on a reflection interferometer
Terentyev V.S.
1, Simonov V.A.
1
1Institute of Automation and Electrometry, Siberian BranchRussian Academy of Sciences, Novosibirsk, Russia
Email: terentyev@iae.nsk.su
Experimental study of the sensor in the Kretschmann optical scheme, in which the sensitive element is a reflection interferometer (RI) for the oblique incidence of light, is presented for the first time. A brief theory of RI is given. The experimental sample was used to measure the refractive index of the residual atmosphere in a vacuum chamber during its pumping. The high Q-factor of the RI resonator made it possible to obtain a fairly narrow spectral maximum with a width of 1.7 nm. The spectral sensitivity of the sensor was 1000 nm/RIU and the quality parameter was 529 RIU-1, it was also demonstrated that resolution of 6.5·10-8 RIU can be achieved. Proposals for further improvement of the sensor characteristics are formulated. Keywords: reflection interferometer, total internal reflection, refractive index sensor.
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