Optical system based on portable efficient-measurement ultraviolet absorption spectrum

Abstract

The invention provides an optical system based on a portable efficient-measurement ultraviolet absorption spectrum. The optical system consists of an ultraviolet light source collimation optical system, a multi-reflection basin optical system and a focusing and coupling fiber optical system. The ultraviolet light source collimation optical system consists of an ultraviolet light source and three lenses; the multi-reflection basin optical system adopts a manner of placing three concave-spherical reflection lenses with three curvature radiuses in a conjugated manner; and the focusing and coupling fiber optical system uses a non-spherical single lens to focus and couple outgoing beams for an optical fiber, so that the outgoing beams are guided to a spectrometer for probing. According to the optical system provided by the invention, the detection resolution of the entire system is improved, the measurement accuracy is ensured, and the entire optical system is portable and compact.

Description

Technical field [0001] The invention belongs to the field of optical measurement methods, and in particular relates to an optical system based on portable measurement of high-efficiency ultraviolet absorption spectra. Background technique [0002] Common optical methods include differential absorption spectroscopy (DOAS), tunable diode laser absorption spectroscopy (TDLAS), and Fourier infrared spectroscopy (FTIR). Among them, the detection limit of TDLAS is much lower than that of DOAS and FTIR. Its disadvantage is that the wavelength tunable range of the diode laser is narrow, and the type of measurement gas is single. When detecting different gases, it is necessary to replace the laser of the corresponding wavelength. Therefore, the wavelength range of the laser and the detector limit its use range. FTIR technology has obvious advantages in infrared spectrum analysis. It can obtain full spectrum (2~15um) data at one time. It does not require spectral scanning. It has high lig...

AI Technical Summary

Problems solved by technology

Among them, the detection limit of TDLAS is much lower than that of DOAS and FTIR. Its disadvantage is that the diode laser has a narrow wavelength tunable range, and the type of gas to be measured is single. When detecting different gases, it is necessary to replace the laser with the corresponding wavelength.

However, the traditional DOAS system is relatively complex and not easy to carry, which limits its mobile rapid emergency monitoring in heavily polluted areas, factories, workshops, indoors and pollution leakage accidents

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