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Quartz tuning fork enhanced photoacoustic gas cell

A technology of quartz tuning fork and photoacoustic spectroscopy, which is applied in the direction of material analysis, measuring devices, instruments, etc. through optical means, can solve the problems that the lens is far away from the quartz tuning fork, difficult to integrate volume, and large loss along the way, so as to achieve easy integration, Effects of improving sensitivity and improving accuracy

Active Publication Date: 2015-08-19
BEIJING RES INST OF TELEMETRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This device uses a focusing lens to converge, so the beam diameter of its optical path is relatively large. In order to make the light completely enter the resonant cavity, the lens needs to be far away from the quartz tuning fork, which is not conducive to miniaturization and has a large loss along the way. The length of the resonant cavity can only be determined. is the half wavelength of the sound wave
Its problems are low sensitivity, difficult integration and large volume

Method used

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  • Quartz tuning fork enhanced photoacoustic gas cell
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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] like figure 1 Shown is a schematic diagram of the structure of the quartz tuning fork enhanced photoacoustic spectrum gas cell of the present invention. Quartz tuning fork enhanced photoacoustic spectrum gas cell, including the first c-lens collimator lens 4, the second c-lens collimator lens 1, the first resonant tube 3, the second resonant tube 2, quartz tuning fork 7, double V-shaped Groove holder 8 and base 9. The double V-groove fixing seat 8, the first c-lens collimating lens 4 and the second c-lens collimating lens 1 are fixedly installed on the base 9; the first resonant tube 3, the second resonant tube 2 and the quartz tuning fork 7 Fixed on the double V-groove fixing seat 8; the first resonant tube 3 and the second resonant tube 2 are symmetrically installed on both sides of the quartz tuning fork 7; the quartz tuning fork 7 is located on the first c...

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Abstract

The invention discloses a quartz tuning-fork enhanced-type photo-acoustic spectrum gas cell, which comprises a first c-lens collimating lens (4), a second c-lens collimating lens (1), a first resonance tube (3), a second resonance tube (2), a quartz tuning fork (7), a dual V-shaped groove fixed seat (8) and a substrate (9), wherein a light path emitted from the second c-lens collimating lens (1) reaches the first c-lens collimating lens (4) after passing through the second resonance tube (2), the finger clearance of the quartz tuning fork (7) and the first resonance tube (3). The c-lens collimating lenses are adopted in the gas cell, so that the light beam can completely pass through the resonance tubes and the quartz tuning fork, the loss of the light beam in incidence can be avoided, and the sensitivity of the gas cell can be improved. Meanwhile, by the adoption of the c-lens collimating lenses, collimating focus is not needed between the light source and the gas cell, so that the size of the photo-acoustic spectrum gas detection device is reduced.

Description

technical field [0001] The invention belongs to the technical field of gas detection, in particular to a gas cell used in a photoacoustic spectrum gas detection system. Background technique [0002] Photoacoustic spectroscopy mainly studies the detection and quantification of low-concentration (trace) substances in gases. Photoacoustic spectroscopy is not limited by the shape and form of the sample to be tested, does not require special pretreatment, can be measured in the original state, and the amount of sample used is small. The photoacoustic gas detection device is mainly composed of a light source, a light source control system, a photoacoustic cell, an acoustic sensor, an amplifier circuit, and a signal processing system. [0003] The gas cell, which is a combination of photoacoustic cell and acoustic sensor, is a sensitive element for photoacoustic gas detection. Generally, a microphone (microphone) is used as an acoustic detection element. The gas cell has a large s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/17G01N21/01
Inventor 周建发
Owner BEIJING RES INST OF TELEMETRY
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