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Optical system based on portable efficient-measurement ultraviolet absorption spectrum

An optical system and external absorption technology, which is applied in the field of optical systems, can solve the problems of narrow diode laser wavelength tunable range, restricted movement, rapid emergency monitoring, and single type of gas to be measured, so as to achieve high effective energy utilization efficiency and meet the needs of rapid movement. Emergency monitoring, light weight effect

Inactive Publication Date: 2014-06-04
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Application Information

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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

Method used

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  • Optical system based on portable efficient-measurement ultraviolet absorption spectrum
  • Optical system based on portable efficient-measurement ultraviolet absorption spectrum
  • Optical system based on portable efficient-measurement ultraviolet absorption spectrum

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Embodiment Construction

[0025] Such as figure 1 As shown, the present invention includes an ultraviolet light source deuterium lamp 1, an ultraviolet light source collimation optical system, a multiple reflection pool optical system, and a focusing coupling fiber optical system.

[0026] The ultraviolet light source deuterium lamp 1 emits ultraviolet light beams. Since the deuterium lamp is a surface light source and has a large divergence angle, it must be collimated to increase the effective energy entering the subsequent multiple reflection pool optical system. The collimating optical system of the ultraviolet light source adopts the form of front and rear groups. The front group lens is composed of a short focal length positive lens, which firstly collimates the divergent beam of the deuterium lamp, and ensures a certain object-side aperture angle to receive as much light energy as possible. , The rear lens group uses a negative lens group formed by a combination of positive and negative lenses ...

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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, in particular to an optical system based on portable measurement of high-efficiency ultraviolet absorption spectrum. Background technique [0002] Common optical methods include differential absorption spectroscopy (DOAS), tunable diode laser absorption spectroscopy (TDLAS), and Fourier transform infrared spectroscopy (FTIR). Among them, the detection limit of TDLAS is much lower than that of DOAS and FTIR. Its disadvantage is that the diode laser wavelength can be tuned in a narrow 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. Therefore, the wavelength range of the laser and the detector limit its use. FTIR technology has obvious advantages in infrared spectrum analysis. It can obtain full-spectrum (2-15um) data at one time, does not require spectral scanning, has high light ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J3/42G01J3/10G01N21/33
CPCG01N21/33G01N2201/0221G01N21/031
Inventor 江宇谢品华司福祺秦敏陈军
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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