Device for broadband CARS detection of 1 delta oxygen and use method thereof

Abstract

The invention provides a device for broadband CARS detection of 1 delta oxygen and a use method thereof, the device includes a pulse laser and a broadband dye laser, after pumped lasers outputted by the pulse laser pass through a beam splitter mirror, part of the pumped lasers outputted by the pulse laser are incident to the dye laser to generate broadband dye laser; the other part of the pumped lasers pass through a total reflective mirror and a dichroic mirror, then are combined with the broadband dye laser, and pass through an optical cavity light transmitting hole to focus in an optical cavity for generating four-wave mixing to produce coherent anti Stokes Raman scattering (CARS) light, and the CARS light passes through a low pass filter, and received and collected by a wavelength analyzer. The uses the broadband dye laser, and can simultaneously obtain CARS spectral signals of ground state oxygen and delta oxygen, so that the delta oxygen content can be determined according to the intensity ratio of the (CARS) light signals of the ground state oxygen and delta oxygen. By arrangement of the broadband dye laser, fast on-line detection of one or one kind of gases with similar Raman activity can be achieved, and the detection efficiency can be improved.

Description

technical field [0001] The invention relates to a spectrum detection device, in particular to a broadband CARS detection 1 Delta oxygen devices and methods of use thereof. Background technique [0002] The measurement of the gas concentration and distribution law in the oxygen iodine laser is very important for the study of the kinetic process and performance improvement of the oxygen iodine laser. The detection methods currently used are mainly spontaneous Raman scattering, laser-induced fluorescence, etc., but the Raman spectral lines obtained by spontaneous Raman scattering are weak, so multiple accumulations are required to obtain a Raman frequency shift signal, and due to external The signal-to-noise ratio is very poor due to the interference of stray light; the laser-induced fluorescence method is theoretically feasible, but the fluorescent part of excited oxygen is in the coverage area of ​​iodine fluorescence, so it is difficult to obtain accurate results. At prese...

AI Technical Summary

Problems solved by technology

The detection methods currently used are mainly spontaneous Raman scattering, laser-induced fluorescence, etc., but the Raman spectral lines obtained by spontaneous Raman scattering are weak, so multiple accumulations are required to obtain a Raman frequency shift signal, and due to external Interference of stray light, poor signal-to-noise ratio; laser-induced fluorescence method is theoretically feasible, but the fluorescent part of excited oxygen is in the coverage area of ​​iodine fluorescence, so it is difficult to obtain accurate results

At present, there are great difficulties in measuring the concentration of excited oxygen, which also sets obstacles for the kinetic research of oxygen iodine lasers.

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