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Longitudinal resonant photoacoustic pool for photoacoustic spectrometry monitoring of gases

A resonant photoacoustic cell and photoacoustic spectroscopy technology, which is used in the measurement of color/spectral characteristics, measurement devices, material analysis by optical means, etc. Low ratio and other problems, to achieve the effect of no pollution and interference, good reliability and small size

Inactive Publication Date: 2011-01-19
CHONGQING UNIV
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Problems solved by technology

These resonant photoacoustic cells have the disadvantages of large volume, poor anti-interference ability, and low signal-to-noise ratio.

Method used

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  • Longitudinal resonant photoacoustic pool for photoacoustic spectrometry monitoring of gases
  • Longitudinal resonant photoacoustic pool for photoacoustic spectrometry monitoring of gases

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Embodiment Construction

[0026] The technical solution of the present invention will be described in further detail below according to the accompanying drawings.

[0027] Such as figure 1 Shown is a schematic structural view of the longitudinal resonant photoacoustic cell of the present invention. The longitudinal resonant photoacoustic cell of the present invention is used for photoacoustic spectrum monitoring of dissolved gas in transformer oil, and the photoacoustic cell includes a light inlet 1, a light outlet 2, a resonant cavity 3, a first buffer chamber 4, and a second buffer chamber 4 ', microphone 5, temperature sensor 6, pressure sensor 7, air inlet 9, air outlet 10, first Brewster window 11, second Brewster window 11'. The first buffer chamber 4 and the second buffer chamber 4' are respectively arranged at both ends of the photoacoustic cell; the light entrance 1 passes through the first buffer chamber 4, the resonant cavity 3, and the second buffer chamber 4' in sequence Connected to the...

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Abstract

The invention discloses a photoacoustic spectrometry principle-based longitudinal resonant photoacoustic pool applied to monitoring gases dissolved in transformer oil. The longitudinal resonant photoacoustic pool mainly comprises a resonant cavity, buffer chambers, a Brewster window, a gas inlet, a gas outlet and a microphone, wherein the first buffer chamber and the second buffer chamber are arranged at the two ends of the photoacoustic pool and connected with the gas inlet and the gas outlet respectively; a light inlet is connected to a light outlet through the first buffer chamber, the resonant cavity and the second buffer chamber sequentially; the photoacoustic pool is a cylindrical cavity; the microphone is fixed in the middle of the resonant cavity; the opening of the microphone is aligned with the tube wall of the resonant cavity; a temperature sensor is arranged in the first buffer chamber; and a pressure sensor is arranged in the second buffer chamber. The longitudinal resonant photoacoustic pool for the photoacoustic spectrometry monitoring of the gases is characterized by simple structure, small volume, high sensitivity, quick time response, low background noise, capability of detecting multi-component gases, and good application to the photoacoustic spectrometry monitoring of the gases dissolved in the transformer oil.

Description

technical field [0001] The invention belongs to the technical field of electric equipment detection / monitoring, and in particular relates to the detection technology of dissolved gas in transformer oil. Background technique [0002] Gas photoacoustic spectroscopy detection technology is an effective gas detection method. It has a good application prospect in the detection of dissolved gases in transformer oil. It combines many advantages of gas chromatography and sensor array method, and has high sensitivity and selectivity. Good, wide detection range, and easy to realize the excellent characteristics of real-time detection of multi-component gases. As the source of photoacoustic signals, the photoacoustic cell is the core part of the photoacoustic spectroscopy monitoring system, and its performance is directly related to the sensitivity and stability of the photoacoustic system. Gas photoacoustic cells are divided into two types: resonance type and non-resonance type. Comp...

Claims

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Application Information

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IPC IPC(8): G01N21/01G01N21/17G01N21/25
Inventor 陈伟根王有元杜林周湶廖瑞金唐炬刘冰洁
Owner CHONGQING UNIV
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