High reflector screening method applied to optical cavity structure

Abstract

The invention provides a high reflector screening method applied to an optical cavity structure. The method comprises the following steps: 1) selecting a suitable high reflector according to light absorption cross section features of atmospheric molecules with concentration to be tested, and making a high value end of a reflection curve of the high reflector be overlapped with a wavelength range where a central peak wavelength of an emission spectrum of a light source and a maximum light absorption cross section of the atmospheric molecules with concentration to be tested as much as possible;and 2) in the case that the above step 1) is satisfied, assuming that the reflectivity peak of the high reflector is located at a wavelength lambda max, the reflectivity peak is Rmax, and the light transmittance at the wavelength lambda max is T, when the high reflector is selected at last, maximizing the value of (the formula is described in the specification) to achieve the best sensitivity andsignal to noise ratio. The optical cavity structure of the high reflector screened out by the method can not only effectively and conveniently detect the concentration of the atmospheric molecules, but also can effectively detect the concentration of atmospheric molecules with ultra-low concentration.

Description

technical field [0001] The present application relates to the technical field of environmental monitoring, in particular to a method for screening high reflection mirrors applied to optical cavity structures. Background technique [0002] With the continuous development of society and economy, air pollution has attracted more and more attention in most parts of the world, especially in developing countries. In order to detect the severity of air pollution, it is usually necessary to use detection instruments to analyze atmospheric molecules (such as gas molecules NO 2 , HCHO, CHOCHO, N 2 o 5 , NO 3 , HONO, aerosol, etc.) to detect the concentration. In the prior art, before using a detection instrument to detect the concentration of atmospheric molecules, it is usually necessary to calibrate the sensitivity coefficient (sensitivity coefficient) of the detection instrument with a standard gas of known concentration, and to calibrate the detection with a standard gas of kn...

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Problems solved by technology

In the prior art, before using a detection instrument to detect the concentration of atmospheric molecules, it is usually necessary to calibrate the sensitivity coefficient (sensitivity coefficient) of the detection instrument with a standard gas of known concentration, and to calibrate the detection with a standard gas of known concentration. The sensitivity factor of the instrument will add addi

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