Multichannel laser induced breakdown spectrometer and multichannel spectral detection method

Abstract

The invention discloses a multichannel laser induced breakdown spectrometer and a multichannel spectral detection method. The spectrometer comprises a circular ring flange and a laser, wherein a plurality of detection lens groups are uniformly mounted on the circular ring flange; the laser is arranged at the center of the circular ring flange; the transmitting end of the laser and the light incidence end of each of the detection lens groups face to a detected object; connecting optical fibers are arranged at the light emergence end of the of each of the detection lens groups, the tail ends ofthe connecting optical fibers are combined into an optical fiber bundle, and the optical fiber bundle is connected with a spectral detector; after the laser emits laser light, a plasma substance is induced from the detected object, and light radiated during the energy level transition is received by the plurality of detection lens groups on the circular ring flange and transmitted to a spectrum detector by the connecting optical fibers and the optical fiber bundle. The multichannel laser induced breakdown spectrometer and the multichannel spectral detection method disclosed by the invention not only can solve the selection problem of a receiving angle, but also can enhance the signal energy finally entering the spectrum detector through a multichannel mode, thereby improving the signal-to-noise ratio.

Description

technical field [0001] The invention belongs to the technical field of optical detection, and relates to a multi-channel laser-induced breakdown spectrometer and a multi-channel spectral detection method. Background technique [0002] Traditional laser-induced breakdown spectroscopy uses a spectral detector as a detector for detection, and there is only a set of collection lenses and optical fibers in front of it. Its disadvantage is that if the ionic substances excited by the incident laser do not travel to the direction of the collecting lens, or deviate from a certain direction, it is difficult for the detector to detect a strong signal. The larger the deviation direction, the weaker the effective signal and the lower the signal-to-noise ratio. When the deviation direction is greater than a certain angle, the useful signal may be submerged in the noise. [0003] The existing improved technology adopts the scheme of rotating the collection lens on the basis of the tradit...

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Problems solved by technology

[0005] The purpose of the present invention is to design a multi-channel laser-induced breakdown spectrometer and multi-channel spectral detection method based on the multi-channel detection mode of optical fiber, to solve the problem of angle adjustment during laser-induced breakdown and spectral detection, and to detect radiation in parallel spectrum to enhance the signal-to-noise ratio

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