Detection system and hydrogen detection method
A detection method and detection system technology, applied in measuring devices, instruments, and material analysis through optical means, can solve problems such as poor selectivity, low detection sensitivity, and slow signal response
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[0042] The embodiment of the present invention does not specifically limit the preparation of the micro-nano optical fiber, which can be obtained by direct drawing from a common single-mode optical fiber, or directly purchased from the market.
[0043] Preferably, the diameter of the micro-nano fiber is 0.3-0.9 times the wavelength of the pump light.
[0044] When the diameter of the micro-nano fiber is 0.9 times larger than the wavelength of the pump light, the proportion of the evanescent field decreases, the efficiency of stimulated Raman scattering decreases, and the sensitivity decreases; when the diameter of the micro-nano fiber is smaller than 0.3 times the wavelength of the pump light, the evanescent field The intensity decreases, the stimulated Raman scattering efficiency decreases, and the sensitivity decreases.
[0045] Preferably, the length of the micro-nano optical fiber is 1-100 mm.
[0046] Theoretically, the longer the micro-nano fiber, the higher the sensiti...
Embodiment 1
[0075] This embodiment provides a method for detecting hydrogen gas, which is implemented based on the above-mentioned figure 2 The specific operation steps of the detection system shown are as follows:
[0076] 1. Keep the intake valve and exhaust valve open, and the gas to be tested enters the sample collection chamber to be tested through the flow controller and the air filter in turn;
[0077] Among them, the diameter of the micro-nano optical fiber arranged in the sample collection chamber to be tested is 0.7 μm, and the length is 48 mm; the diameter of the waist region of the micro-nano optical fiber is 700 nm, and the length of the waist region is 48 mm.
[0078] 2. The pump light and Stokes light are injected from the input end of the micro-nano fiber through the laser driving device of the control module, and the frequency of the pump light injected into the micro-nano fiber is adjusted by the laser driving device of the control module to be 195.6THz, power 300mW, S...
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