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A trace gas concentration detection device

A technology for trace gas and concentration detection, applied in measurement devices, color/spectral characteristic measurement, instruments, etc., can solve the problem of inaccurate extraction of trace gas concentration signals, reduce external noise interference sources, reduce error effects, and improve information. The effect of noise ratio

Active Publication Date: 2022-06-24
杭州国节能源技术有限公司
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  • Abstract
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Problems solved by technology

[0004] Aiming at the problem that the existing trace gas concentration signal extraction is not accurate enough, the present invention provides a trace gas concentration detection device

Method used

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  • A trace gas concentration detection device
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Embodiment Construction

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0027] It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but it is not intended to limit the present invention.

[0029] A trace gas concentration detection device in this embodiment includes a l...

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Abstract

A trace gas concentration detection device solves the problem of inaccurate extraction of existing trace gas concentration signals, and belongs to the field of weak signal detection. The present invention utilizes the internal digital circuit of FPGA to build an arbitrary waveform generation module, and the reference signals required in the digital signal processing module and the driving signals required by the laser drive source are all generated by the arbitrary waveform generation module, which ensures that they are sent to the digital signal processing module to the greatest extent. The frequency of the input signal containing trace gas information is consistent with the frequency of the reference signal to obtain accurate gas concentration information. The dual-channel phase-frequency lock-in amplifier built by the internal digital signal processing module of the FPGA will generate two-way difference frequency signals with phase information from the two channels, and after the square processing is performed by the multiplier, the two-way signals are added, and passed through the open The amplitude information with a phase error of 0 is obtained, which avoids the influence of the phase error between the detected signal and the reference signal.

Description

technical field [0001] The invention relates to a trace gas concentration detection device, which belongs to the field of weak signal detection. Background technique [0002] Tunable semiconductor laser absorption spectroscopy is a widely used detection technology for weak gases. Due to the different molecular vibration or rotation frequencies generated by different gas molecules, when the laser frequency emitted by the laser is different from the vibration or rotation frequency of the specific gas molecules to be detected. At the same time, the light energy of this wavelength will be absorbed by specific molecules, thereby attenuating the light intensity of the incident laser light. Then, the attenuated light intensity signal is processed by photoelectric conversion, and then passes through the signal conditioning circuit and digital signal processing circuit to obtain specific amplitude information, and then compares the input and output light intensity changes before and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/39G01N21/01
CPCG01N21/39G01N21/01
Inventor 盖建新南瑞祥薛宪峰吴静怡
Owner 杭州国节能源技术有限公司
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