Differential spectral optical sensing

V. E. Pozhar; S. V. Boritko; A. V. Karandin

doi:10.1117/12.2521010

14 April 2019 Differential spectral optical sensing

V. E. Pozhar, S. V. Boritko, A. V. Karandin

Proceedings Volume 11028, Optical Sensors 2019; 1102825 (2019) https://doi.org/10.1117/12.2521010
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic

Abstract

An original concept of optical sensing is presented. It assumes detection of differential spectral characteristics of the analyzed object, in particular the spectral derivative. This approach provides direct discrimination of local spectral features (lines of emission, absorption Raman scattering) from the smooth background. The concept is realized with original spectral instrument based on acousto-optical tunable filter operating in modulation mode. Rapid modulation of ultrasonic wave provides inhomogeneous oscillating Bragg grating. It is demonstrated that the component of the periodical photodetector signal selected by phase-sensitive technique at the modulation frequency is proportional to the spectral derivative value at the wavelength of the filter. This optical sensing method does not require spectral recording and further derivative calculation. Therefore, it is promising in spectral imaging applications for real-time acquisition of images rectified from the background.

Citation Download Citation

V. E. Pozhar, S. V. Boritko, and A. V. Karandin "Differential spectral optical sensing", Proc. SPIE 11028, Optical Sensors 2019, 1102825 (14 April 2019); https://doi.org/10.1117/12.2521010

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