Optical fiber transceiver integrated air differential optical absorption spectroscopy (DOAS) measuring system

Abstract

The invention provides an optical fiber transceiver integrated air differential optical absorption spectroscopy (DOAS) measuring system, which solves the problems of low spectrum utilization ratio and difficulty in instrument adjustment and optical path centering of the existing typical DOAS system. The measuring system comprises a point light source, a telescope, a spectrograph and an optical fiber bundle with a transceiver integrated structure, wherein, the optical fiber bundle with the transceiver integrated structure is composed of transmitting optical fiber and receiving optical fiber and provided with an optical fiber transceiver common port. The spectrum sent by the point light source is transmitted through the optical fiber transceiver common port from one end of the transmitting optical fiber, aligned through a spherical reflector in the telescope, reflected along the original direction after reaching a pyramid prism, focused through the spherical reflector and then enters the optical fiber transceiver common port, and finally transmitted through the other end of the receiving optical fiber and then led into the spectrograph for spectrum detection. Compared with the typical DOAS system, the measuring system reduces two plane reflectors, avoids a light beam being sheltered by the plane reflector during the transmission process, improves the spectrum utilization ratio and simplifies the instrument adjusting and centering process.

Description

【Technical field】: [0001] The invention relates to a differential absorption spectrum air quality monitoring system, in particular to a monitoring system for measuring trace gas in the air. 【Background technique】: [0002] Air pollution destroys the ecosystem and causes great harm to human health. Therefore, it is necessary to monitor various air pollutants first. The monitoring instruments in many cities in my country adopt point sampling, which can only understand the air pollution situation in the sampling space of the monitoring point and the average condition during the sampling period, and the temporal and spatial representation is poor. The telemetry technology using differential absorption spectroscopy (DOAS) is becoming an ideal tool for environmental pollution monitoring due to its large-scale, multi-component detection, and continuous real-time online measurement methods. Using DOAS technology can simultaneously monitor several pollutants in the same spectral abs...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low spectrum utilization efficiency and difficulty in instrument adjustment and optical path alignment in the existing DOAS system, and to provide an optical fiber transceiver integrated air differential absorption spectrum measurement system

Images