Testing method and system for measuring gas component concentration using spontaneous Raman scattering technology
A test system and concentration technology, applied in the direction of Raman scattering, material excitation analysis, etc., can solve the problems of inability to measure component concentration, difficult adjustment of optical path, difficult calibration, etc., achieve fast test speed, improve signal-to-noise ratio, and easy operation Effect
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Embodiment 1
[0042] see figure 1 , the test device consists of a laser, a collection system, a detection system and a data processing system. The laser 1 is a linearly polarized laser. Before reaching the sample cell A, it passes through a lens 11 to collect the laser beam and strengthen its optical density; A device 12 for absorbing laser light is provided below to prevent laser light from scattering. The collection system is a lens 2, and the lens 2 is a biconvex lens, a plano-convex lens or a meniscus lens that can collect light beams; an extinction cylinder 7 is set on the outside of the lens 2; the detection system is a grating spectrometer 3 with an array detector ICCD 9, the grating There is a filter 8 in front of the spectrometer 3, and the grating of the grating spectrometer 3 can be adjusted, which can observe the Raman spectra of multiple components at the same time, and adjust the spectral range according to the different components of the sample material; the data processing s...
Embodiment 2
[0045] The following takes the performance parameter measurement of the singlet oxygen generator as an example to illustrate the use method of the device of the present invention.
[0046] We use spontaneous Raman scattering spectroscopy to measure N 2 , O 2 (a 1 Δ)and O 2 (X 3 ∑) concentration, the same device was used to measure the O concentration for the first time. 2 ( 1 Δ) yield and chlorine utilization.
[0047] see figure 2 , because the gas pressure is low, the pump light power is required to be high, so a high-power pulsed laser is generally used, and a YAG laser is used in this embodiment. The sample cell A is the airflow delivery section of the singlet oxygen generator 14 (SOG), and the O 2 ( 1 Δ) The mixed gas flow is pumped away by the vacuum pump 13 at a certain rate to keep the gas in a negative pressure state. A window is opened on the airflow conveying pipe at the exit of SOG14, the laser light of YAG laser 1 is focused on the test point by the len...
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