Open AccessThe optical sensor for detecting NO2 and O3 using a white GaN LED
Author(s) -
Yu. А. Novikova,
M. B. Ryzhikov,
G. V. Tereshchenko
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1047/1/012065
Subject(s) - materials science , optoelectronics , optics , absorption (acoustics) , spectroscopy , coating , broadband , radiation , wavelength , optical radiation , white light , absorption spectroscopy , optical coating , physics , nanotechnology , quantum mechanics
This article describes the scheme and principle of operation of an optical sensor for detecting nitrogen dioxide (NO 2 ) and ozone (O 3 ) based on the effect of optical absorption spectroscopy. A distinctive design feature of the proposed technical solution is that it is proposed to use an inexpensive powerful white led based on GaN as an optical radiation source, which has two relatively wide radiation peaks at wavelengths λ from 420 to 440 nm and λ from 525 to 650 nm. To separate the light streams and form separate measurement channels, three multilayer optical coatings were synthesized: a broadband beam-splitting coating and two narrow-band reflective coatings.