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Photoacoustic spectroscopy telemetering method and device based on micro quartz tuning fork optoacoustic effect

A technology of photoacoustic effect and photoacoustic spectroscopy, which is applied in the field of photoacoustic spectroscopy, can solve problems such as measurement result deviation, detection sensitivity is not high enough, and it is difficult to use dangerous goods to detect, so as to improve anti-interference ability, improve signal-to-noise ratio, and improve The effect of anti-interference ability

Inactive Publication Date: 2013-05-15
XI AN JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

It is convenient and simple to directly obtain electrical signals by using the piezoelectric characteristics of quartz crystals, but there are disadvantages such as insufficient detection sensitivity and large influence of temperature on piezoelectric coefficients, resulting in deviations in measurement results.
Difficult to use in the detection of dangerous goods in airports and other occasions

Method used

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  • Photoacoustic spectroscopy telemetering method and device based on micro quartz tuning fork optoacoustic effect
  • Photoacoustic spectroscopy telemetering method and device based on micro quartz tuning fork optoacoustic effect
  • Photoacoustic spectroscopy telemetering method and device based on micro quartz tuning fork optoacoustic effect

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Embodiment Construction

[0040] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0041] see figure 1 , a photoacoustic spectroscopy telemetry method based on the photoacoustic effect of quartz micro-tuning forks, including the following operations:

[0042] 1) Modulate the continuous light with continuously changing wavelength into light whose light intensity changes at a certain frequency. The frequency of light intensity change is consistent with the resonance frequency of the quartz micro-tuning fork, and then irradiate the light onto the object to be measured;

[0043] 2) The light is reflected on the object to be measured, and the concave mirror is used to collect the reflected light of the object to be measured, and the reflected light is focused on the quartz micro-tuning fork, and the photoacoustic effect is generated in the quartz micro-tuning fork, and the quart...

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Abstract

The invention discloses a photoacoustic spectroscopy telemetering method and device based on a micro quartz tuning fork optoacoustic effect. The method comprises the following steps of: modulating continuous light of which the wavelength changes continuously into light of which the light intensity changes according to a certain frequency, and irradiating the light of which the light intensity changes to an object to be tested; collecting light reflected by the object to be tested by a concave mirror, and irradiating the collected light to a micro quartz tuning fork, wherein the amplitude of the micro quartz tuning fork changes along with the wavelength of incident light waves; and irradiating an arm of the micro quartz tuning fork by another beam of laser, wherein the light spot position of the reflected laser beam moves along with the vibration of the micro quartz tuning fork, the reflected light is irradiated to a light spot position detector after the light path of the reflected light is lengthened through a folded path, the amplitude size of the micro quartz tuning fork can be obtained by detecting the movement of the light spot, and the absorption spectrum of the tested object can be obtained by continuously changing the output wavelength of a variable wavelength laser. The method does not need sample preparation and pre-concentration processes or a photoacoustic cell, and can be used for directly and remotely measuring objects in an open environment.

Description

technical field [0001] The invention belongs to the technical field of photoacoustic spectroscopy, and relates to a photoacoustic spectroscopy telemetry method and device based on the photoacoustic effect of a quartz micro-tuning fork. Background technique [0002] Photoacoustic spectroscopy is a spectroscopic technique developed based on the photoacoustic effect. Photoacoustic spectroscopy measures the amount of light energy absorbed by an object. It can measure strong light scattering and opaque objects that are difficult to measure by traditional spectral methods, and the samples can be measured whether they are crystals, powders, colloids, etc. It has high sensitivity and wide application range. advantage. It has broad application prospects in physics, chemistry, chemical industry, geology, biology, medicine and other aspects. [0003] According to the literature search, the existing photoacoustic spectroscopy measurement methods are mainly divided into two categories,...

Claims

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Application Information

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IPC IPC(8): G01N21/17G01N21/39
Inventor 贾书海张周强马斌山陈花玲
Owner XI AN JIAOTONG UNIV
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