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Photoacoustic spectrometry gas detection device capable of correcting resonant frequency of quartz tuning fork in real time

A quartz tuning fork, resonant frequency technology, applied in measurement devices, color/spectral characteristic measurement, material analysis by optical means, etc., can solve the problems of poor integration performance of detection system, high measurement cost, single function, etc. , Improve the response rate and ensure the effect of measurement accuracy

Inactive Publication Date: 2015-01-28
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now, there are many examples of methods and equipment for measuring the resonant frequency of quartz crystal oscillators, but they are all frequency measurement equipment with a single function, poor integration performance with other detection systems, and low compatibility. Such equipment is used for photoacoustic spectroscopy gas detection systems. The cost of resonant frequency measurement is very high, the structure is complicated, and the operation is troublesome.

Method used

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  • Photoacoustic spectrometry gas detection device capable of correcting resonant frequency of quartz tuning fork in real time
  • Photoacoustic spectrometry gas detection device capable of correcting resonant frequency of quartz tuning fork in real time
  • Photoacoustic spectrometry gas detection device capable of correcting resonant frequency of quartz tuning fork in real time

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Effect test

Embodiment 1

[0044] Embodiment 1 of the present invention such as Figure 1-3 As shown, a photoacoustic spectroscopy gas detection device capable of real-time correction of the resonance frequency of a quartz tuning fork includes a PC 12, a signal generator 1, three gating switches a, b, c, a laser controller 2, a laser 3, Collimator 4, convex lens 5, gas chamber 6, quartz tuning fork 7, quartz tuning fork circuit 13, current-to-voltage circuit 8, preamplifier 9, lock-in amplifier 10, data acquisition card 11, it is characterized in that PC 12 and The three gating switches a14, b15, c16 are connected to control their gating status, and the PC 12 is connected to the signal generator 1; one of the signal generators 1 is connected to the laser controller 2 through the gating switch a14, and the other Connect to the quartz tuning fork circuit 13 through the gating switch a14 again; the other road is connected to the lock-in amplifier 10; Located in front of the air chamber 6, the quartz tunin...

Embodiment 2

[0052] A working method of the above-mentioned photoacoustic spectroscopy gas detection device capable of real-time correction of the resonant frequency of the quartz tuning fork, the steps are as follows:

[0053] 1) The PC controls the signal generator through labview programming to generate a frequency sweep signal with a sine wave waveform and a sweep frequency range of 32760Hz to 32770Hz. The sweep frequency range can be adjusted in the actual application process; the frequency adjustment step of the sweep signal is set 0.1Hz, a single frequency sweep time is 1s, the response time of the quartz tuning fork is between 250ms and 300ms, the sweep time of 1s ensures that it can fully respond, one of the sweeping signals generated by the signal generator is selected by the strobe switch a After passing through, it is sent to the quartz tuning fork circuit, and the other is sent to the lock-in amplifier as a reference signal for the first harmonic detection;

[0054] 2), the fr...

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Abstract

The invention discloses a photoacoustic spectrometry gas detection device capable of correcting the resonant frequency of a quartz tuning fork in real time, and belongs to the field of signal generation and correction in photoacoustic spectrometry gas detection technology. The device comprises a PC (personal computer), a signal generator, a gating switch, a laser device controller, a laser device, a collimator, a convex lens, a gas chamber, the quartz tuning fork, a quartz tuning fork module circuit, a current-to-voltage module, a front amplifier, a phase-locked amplifier and a data acquisition card. According to the device, the resonant frequency of the quartz tuning fork is measured by harmonic detection and peak detection, and a measurement result is used for correcting the frequency of a drive signal source in a photoacoustic spectrometry system in real time; a part for measuring the resonant frequency of the tuning fork is simple in structure, a method is novel, and the harmonic detection precision is high; the device is easily integrated with the photoacoustic spectrometry system and is low in additional cost and convenient and flexible to use, the influence due to drift of the resonant frequency of the tuning fork in photoacoustic spectrometry gas detection can be inhibited in actual application, and the system stability is improved.

Description

technical field [0001] The invention relates to a photoacoustic spectrum gas detection device capable of real-time correction of the resonant frequency of a quartz tuning fork, belonging to the field of signal generation and correction in the photoacoustic spectrum gas detection technology. Background technique [0002] At present, quartz tuning fork photoacoustic spectroscopy technology is used as a high-precision measurement method in the field of gas detection. The basic structure of the system is as follows: Figure 4 , wherein the PC 32 controls the signal generator 21 to generate scanning signals and then sends them to the laser controller 22. In addition, a reference signal is also generated and sent to the lock-in amplifier 30 for harmonic detection. The laser controller 22 is used as a temperature control and drive module, so that the laser 23 works normally and emits light. The emitted light hits the convex lens 25 inlaid on the end face of the gas chamber 26 after ...

Claims

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Application Information

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IPC IPC(8): G01N21/17G01N21/25
Inventor 王福鹏常军王宗良朱存光刘永宁
Owner SHANDONG UNIV
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