A method for measuring micro-moisture content

Abstract

The invention discloses a method for measuring micro-water content. The steps are as follows: Step 1: install the water-absorbing pad and the lens on the hollow lens fixing bracket respectively; The reflection of light occurs on the front and back surfaces of the medium contact; Step 3: The reflected light propagates along a reverse path that is completely opposite to the incident light or at a certain angle; Step 4: Form two columns of light waves with the same frequency; Step 5: Two columns of light waves with the same frequency meet in the air and superimpose to form light and dark fringes; Step 6: The photoelectric converter generates interference peaks; Step 7: The signal processing system judges the measured gas according to the phenomenon that the center of the generated interference peak moves The size of the micro-water content. The invention can use common lasers, and simultaneously simplifies the structure of the gas absorption cell, and has high measurement precision, fast response speed and sensitive response.

Description

technical field [0001] The invention relates to the technical field of gas multi-component analysis in the chemical industry, in particular to a method for measuring micro-water content. Background technique [0002] At present, the tunable semiconductor laser spectral absorption technology is gradually mature, and it has replaced the measurement methods such as the mirror method and the gravimetric method as the mainstream. The micro-water measurement method based on tunable semiconductor laser spectroscopy technology, its absorption principle is based on Beer.Special law, its detection accuracy is proportional to the optical path, the longer the optical path, the higher the detection accuracy (the principle diagram is shown in Fig. figure 1 shown). [0003] According to the law of optical propagation, when light hits the interface between two substances, reflection and refraction occur simultaneously. The optical gas absorption cell generally uses an optical glass window...

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Problems solved by technology

[0004] However, the above methods have the following disadvantages in the measurement process: first, a laser with a specific wavelength (1392-1393nm) is required, which is expensive; second, the gas absorption cell to be measured needs hydrophobic materials and sealing, and the technology is not easy to implement; third , because of the introduction of optical fiber, the overall structure is more complicated, and it is easy to introduce optical noise

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