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A light sound spectrum detection device with a self -modulation and noise reduction function

A detection device, a technology of photoacoustic spectroscopy, which is used in measurement devices, material analysis by optical means, instruments, etc., can solve the problems of anti-noise interference and many types of interference sources.

Active Publication Date: 2021-05-28
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

However, due to the complex environment of the application site, such as substations, chemical plants, etc., there are many types of interference sources, and the existing photoacoustic spectroscopy detection devices still have some deficiencies in anti-noise interference
The use of simple vibration isolation measures can only reduce noise interference to a certain extent. Lock-in amplification technology is used to lock the modulation frequency of the photoacoustic spectrometer, and only the signal corresponding to the modulation frequency can be detected. However, if there are modulation frequency components in the noise signal, the lock-in Phase amplification principle powerless

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  • A light sound spectrum detection device with a self -modulation and noise reduction function

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] figure 1 It is a structural schematic diagram of the photoacoustic spectrum detection device with self-frequency modulation and noise reduction function of the present invention. Such as figure 1 As shown, the device of the present invention mainly includes a light source 1, a noise signal detector 2, a mechanical chopper 3, a chopper control module 4, an optical filter disc 5, a photoacoustic cell 7, a microphone 9, a lock-in amplifier 12, an embedded Formula main frame 14, optimal chopping frequency controller 15.

[0035] Measured gas from figure 1 The air inlet shown enters the photoacoustic cell 7 and flows out through the air outlet.

[0036] A filter is mounted on the filter disc 5 .

[0037] Such as figure 1As shown, the mechanical chopper 3 for chopping modulation is placed at the exit end of the light source 1 . The opti...

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Abstract

A photoacoustic spectrum detection device with self-frequency modulation and noise reduction function, comprising: a light source, a mechanical chopper, a chopper control module, a filter disc, a photoacoustic cell, a microphone, a lock-in amplifier, a noise signal detector, Optimal chopping frequency controller and embedded host. The photoacoustic spectrum detection device is equipped with a noise signal detector and an optimal chopping frequency controller; the noise signal detector is installed on the side wall of the photoacoustic pool, and is opposite to the installation direction of the microphone, and the mechanical chopper is controlled by the chopper Controlled by the light controller, the light chopping frequency of the light chopper control module is generated by the optimal light chopping frequency controller through signal processing of the noise signal detector, and transmitted to the light chopper control module through the embedded host.

Description

technical field [0001] The invention relates to a gas detection device. Background technique [0002] Gas detection technology has a wide range of applications in industrial production and daily life, such as leak detection of oil and gas pipelines, detection of dissolved gases in transformer oil in power systems, detection of exhaust gases from chemical companies, and detection of trace pollutant gases in the air, Exhaled gas detection in human diseases and medical diagnosis, etc. [0003] For example, in the power industry, it is used to detect electrical equipment failures, such as power transformers, SF6, fluorocarbon mixed gas and other gas-insulated electrical equipment failure decomposition gas; [0004] For oil-filled power transformers, the characteristic gases that need to be detected include H2, CO, CO2, CH4, C2H6, C2H4, C2H2, etc. At present, there are many detection methods for such gases; for example, patent 200910046340.7 mentions a system for on-line monito...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/17G01N21/01
CPCG01N21/01G01N21/1702
Inventor 李康张国强邱宗甲韩冬
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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