A frequency domain cavity ring-down spectrum detection device won the national invention patent by the Chinese Academy of Sciences
June 25 14:19:56, 2023
[China Instrument Network Instrument Development] In various ultra-high sensitivity spectroscopy detection technologies, passive resonator enhancement technology is an important category, and resonant cavity enhanced spectroscopy technology can be divided into traditional cavity ringdown spectroscopy. , Integral cavity output spectrum, cavity-enhanced absorption spectrum, frequency modulation cavity ring-down spectrum, optical frequency comb chamber ring-down spectrum and other five categories. These traditional technologies have the disadvantages of high photodetection difficulty, expensive device, slow response speed, and low sensitivity.
Researchers at the Xi’an Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Wang Yunmin and Yu Chi have invented a frequency-domain cavity ring-down spectroscopy detection device that can be used in laboratory spectrometry and etalon fine-constant measurement, as well as field applications. The material concentration sensing, strain and stress sensing, temperature sensing, etc. Compared with the traditional method, the advantages of this invention are as follows: 1. High-frequency harmonic detection with signal-to-noise ratio is realized by using low-speed wavelength modulation. 2. To achieve a perfect combination of resonant cavity enhanced spectrum and wavelength modulated spectrum while reducing economic costs. 3, combined with the wavelength modulation spectrum, eliminating the impact of the background interference such as the decrease of optical coupling efficiency, the average power fluctuation of the light source, the detection circuit conversion efficiency is reduced. 4, due to the fineness of the resonant cavity generated by the interference and the signal generated by the spectrum is a multiplied relationship between, by taking the logarithm or calculating the ratio between the various harmonics, eliminates the resonance fineness caused by the decline interference.
The device has been authorized by the national invention patent and won the second prize of the 2016 China Highway Society Science and Technology Award.
(Original Title: "A frequency domain cavity ring-down spectroscopy detection device" has been authorized by the national invention patent)