Micro water steam concentration detection method with self-controlled measuring range
A technology for detecting concentration and water vapor. It is applied in measurement devices, color/spectral characteristic measurement, instruments, etc. It can solve the problems of limited detection simplicity, troublesome conversion, complicated circuits, etc. noisy effect
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[0037] Such as figure 1 As shown, a method for detecting the concentration of trace water vapor with automatic range control is realized by the following measurement system, which includes single-chip microcomputers A, B, temperature control drive module 2, DFB laser 3, gas chamber 4, photodetector 5, current Voltage conversion module 6, lock-in amplifier 7, subtractor 8, gain control module 9, high-precision reference voltage generator 10 and signal acquisition module 11, temperature control drive module 2 includes a temperature control module and a drive module, and the single chip microcomputer A is connected to the drive module , the temperature control drive module is connected with the DFB laser 3, the DFB laser 3 is located in front of the gas chamber 4, the photodetector 5 is placed behind the gas chamber 4, the output end of the photodetector 5 is connected to the input end of the current-voltage conversion module 6, and the current-voltage Conversion module 6 output ...
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