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Photoacoustic spectrum detection system based on weak signal chaos detection

A technology of chaos detection and photoacoustic spectroscopy, which is used in color/spectral property measurement, measurement device, material analysis by optical means, etc. and other problems, to achieve the effect of improving detection accuracy and sensitivity, and improving signal-to-noise ratio.

Inactive Publication Date: 2021-03-19
NANJING UNIV OF TECH
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  • Description
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Problems solved by technology

[0003] Since the photoacoustic gas detection system needs to process the original signal at the microvolt level, and under the strong noise interference of the transformer operation site, the signal-to-noise ratio of the signal is very low, and the detection is very difficult
Conventional instruments use a lock-in amplifier circuit, and the detection accuracy is difficult to achieve the ideal state

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  • Photoacoustic spectrum detection system based on weak signal chaos detection
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  • Photoacoustic spectrum detection system based on weak signal chaos detection

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Embodiment Construction

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0026] The principle of photoacoustic spectroscopy detection based on lock-in amplification is as follows: figure 1 As shown, the signal collected by the microphone is amplified and filtered, and the frequency of the reference signal is shifted to be consistent with the frequency of the input signal. After the two signals are cross-correlated by the phase-sensitive detector, the output signal is filtered by a low-pass filter. The high-frequency component in th...

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Abstract

The invention discloses a photoacoustic spectrum detection system based on weak signal chaos detection. The photoacoustic spectrum detection system comprises a light source driving and modulation module, a non-resonant photoacoustic cell, a photoacoustic signal acquisition circuit and a signal processing system. The invention provides the photoacoustic spectrum detection system based on weak signal chaos detection. The system adopts a non-resonant photoacoustic cell structure signal of a'sample cell + signal cell 'to be amplified and filtered and then transmitted to a computer to realize cross-correlation denoising, and the processed signal is subjected to chaos detection, so that the signal-to-noise ratio of weak signal detection is improved, compared with a traditional phase-locked amplification circuit, the detection precision and sensitivity of the system are further improved.

Description

technical field [0001] The invention relates to the technical field of photoacoustic spectrum detection, in particular to a photoacoustic spectrum detection system based on weak signal chaotic detection. Background technique [0002] The transformer is the core component in the power system. The analysis of the dissolved gas in the transformer oil can find the early faults and effectively prevent the huge losses caused by the grid failure. The traditional chromatographic detection device cannot work stably for a long time, and the detection time is long. Not suitable for on-site analysis. Photoacoustic spectroscopy is a new type of gas sensing technology. It uses the photoacoustic effect to irradiate light on the gas in a closed space. The pressure of the gas changes due to thermal expansion. At this time, if the light source is modulated with a suitable frequency, the airtight The pressure in the space will produce periodic changes consistent with the modulation frequency,...

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Application Information

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IPC IPC(8): G01N21/17G01N21/27
CPCG01N21/1702G01N21/27G01N2021/1704
Inventor 蒋书波尹冲
Owner NANJING UNIV OF TECH
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