Numerical Simulation of Optical Excitation Vibration for Quartz Tuning Forks in Photoacoustic Spectrum Remote Sensing Devices

doi:10.7652/xjtuxb201407017

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Numerical Simulation of Optical Excitation Vibration for Quartz Tuning Forks in Photoacoustic Spectrum Remote Sensing Devices

更新时间：2025-07-09

- Numerical Simulation of Optical Excitation Vibration for Quartz Tuning Forks in Photoacoustic Spectrum Remote Sensing Devices
- Vol. 48, Issue 7, Pages: 96-101(2014)
- 作者机构：
  
  西安交通大学机械工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201407017
  CLC： TN249
- Online First：10 July 2014，
  
  Published：2014
- 稿件说明：
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Numerical Simulation of Optical Excitation Vibration for Quartz Tuning Forks in Photoacoustic Spectrum Remote Sensing Devices[J]. 2014, 48(7): 96-101.
DOI：

Numerical Simulation of Optical Excitation Vibration for Quartz Tuning Forks in Photoacoustic Spectrum Remote Sensing Devices[J]. 2014, 48(7): 96-101. DOI： 10.7652/xjtuxb201407017.

摘要

针对光声光谱遥测装置中不同功率激光器和空气阻尼对石英音叉光激励振动过程的影响问题

采用数值模拟的方法研究了石英音叉的前四阶振型并对各振型进行了分析

建立了激光热激励石英音叉振动谐响应分析模型

模拟了由不同功率激光器发射的激光

经被检测物吸收和凹面镜收集后照射到音叉上时对音叉振动产生的影响

发现照射到音叉的激光能量与激励起音叉的共振振幅成线性关系。此外

还考虑了不同空气阻尼对音叉振动的影响

通过比较分析可知:激光器的功率不能小于10 mW

否则音叉的共振振幅太小

产生的压电信号会更小

不利于微弱信号探测; 采用真空封装消除空气阻尼影响和增加激光器功率均可提高音叉的共振振幅

但前者的影响更大。上述结论可为光声光谱分析的后续研究提供理论指导。

Abstract

The problem that the optical excitation vibration process in photoacoustic spectrum remote sensing devices is influenced by air damping and laser device with different powers is considered

and a numerical simulation method is used to study the first four orders of vibration mode. A harmonic response analysis model for the vibration of quartz tuning forks excited by laser is established. Simulations are performed to study the effects of lasers with different power on vibration of quartz tuning fork

where the lasers after absorption of detected objects and collection by concave mirror excite the vibration. It is found that the resonance amplitude of tuning forks is proportional to the laser energy. In addition

the influence of different air dampings on the vibration of tuning fork is also taken into account in a large extent. Comparative analyses show that the laser power cannot be less than 10 mW

otherwise the resonance amplitude of the tuning fork is too small to generate proper piezoelectric current for detection of weak signal. Adopting vacuum packaging and increasing laser power improve the resonance amplitude of the tuning fork

while the influence of the former is greater. The conclusion may provide a theoretical guidance for further study of the photoacoustic spectrum analysis.

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references

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