Broadband-spectrum type photoacoustic spectrometric long-distance detection apparatus and method for trace substances

A technology of photoacoustic spectroscopy and detection device, which is applied in the field of spectral detection of trace substances, can solve the problems of narrow absorption spectrum range, narrow spectrum absorption range, low detection sensitivity, etc., and achieve the effect of suppressing ambient noise and narrow frequency response bandwidth.

Active Publication Date: 2016-11-16
NEIJIANG NORMAL UNIV
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Problems solved by technology

However, the infrared absorption efficiency of the material of the quartz tuning fork itself is low, and the absorption spectrum range is narrow. When directly detecting the light intensity, there are disadvantages such as low light energy utilizati

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  • Broadband-spectrum type photoacoustic spectrometric long-distance detection apparatus and method for trace substances
  • Broadband-spectrum type photoacoustic spectrometric long-distance detection apparatus and method for trace substances
  • Broadband-spectrum type photoacoustic spectrometric long-distance detection apparatus and method for trace substances

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Embodiment Construction

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

[0023] like Figure 1~4 As described above, a wide-spectrum photoacoustic spectrum trace substance long-distance detection device specifically includes an excitation light source 1, a reflective object 2, a concave mirror 3, a carbon nanotube composite material photoacoustic transducer 4, a quartz tuning fork 5, an optical fiber , a coupler 7, a fiber laser 9, a photodetector 11 and a data processing system 12, the excitation light source 1 and the reflective object 2 are located on the same optical path, the reflective object 2 is attached with a substance to be measured, and the concave mirror 3 is set On the outgoing line of the reflective object 2, the carbon nanotube composite photoacoustic transducer 4 is located at the focal point of the concave mirror 3, and the carbon nanotube composite photoacoustic transducer 4 includes a carbon nanotube composite layer, Th...

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Abstract

The invention discloses a broadband-spectrum type photoacoustic spectrometric long-distance detection apparatus for trace substances, belonging to the field of spectrometric detection of trace substances. The apparatus comprises an excitation light source, a reflecting object, a concave mirror, a carbon nanotube composite photoacoustic energy transducer, a quartz tuning fork, a coupler, a fiber laser, a photoelectric detector and a data processing system, wherein the excitation light source and the reflecting object are located on a same light path; the concave mirror is arranged on the emergent path of the reflecting object; the carbon nanotube composite photoacoustic energy transducer is located at the focus of the concave mirror; the quartz tuning fork and the end surface of an optical fiber form Fabry-Perot cavity; the coupler is connected with the optical fiber; the fiber laser is connected with the coupler via the optical fiber; and the coupler is successively connected with the photoelectric detector and the data processing system via the optical fiber. The invention also discloses a broadband-spectrum type photoacoustic spectrometric long-distance detection method for trace substances and realizes long-distance detection of a plurality of trace substances.

Description

technical field [0001] The invention relates to the technical field of trace substance spectrum detection, in particular to a wide-spectrum photoacoustic spectrum trace substance long-distance detection device and method. Background technique [0002] The development of long-distance detection technology for trace substances is of great significance for long-distance detection of explosives, detection of toxic and harmful substances, and air quality monitoring. Laser infrared spectroscopy has the advantages of high spectral resolution, wide measurement range, and fast response speed, and has become a very important choice for the development of remote trace substance detection technology. Generally speaking, laser infrared spectroscopy mainly includes tunable diode laser absorption spectroscopy, laser photoacoustic spectroscopy, laser photothermal spectroscopy, and laser photothermal spectroscopy based on micro-cantilever beams. Among them, laser photoacoustic spectroscopy ...

Claims

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Application Information

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IPC IPC(8): G01N21/17G01N21/35G01N21/3504
CPCG01N21/1702G01N21/35G01N21/3504G01N2021/1704
Inventor 林成
Owner NEIJIANG NORMAL UNIV
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