Photoacoustic gas sensing device based on polyvinylidene fluoride piezoelectric film

A polyvinylidene fluoride piezoelectric and photoacoustic gas technology, which is used in the measurement of color/spectral characteristics, etc., to achieve the effects of stable operation, wide range and strong drop resistance.
CN103411904BActive Publication Date: 2015-10-14HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
8 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
Publication Date
2015-10-14

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses an opto-acoustic gas sensing device based on a polyvinylidene fluoride piezoelectric film. The opto-acoustic gas sensing device comprises a light source (1) and a tubular acoustic resonant cavity (6) on an optical path (2) of the light source (1), as well as an opto-acoustic gas sensor arranged at the side opening of the tubular acoustic resonant cavity (6) and a modulation-demodulation component adapting to the opto-acoustic gas sensor, particularly, the tubular acoustic resonant cavity (6) is 20 mm-150 mm in length, and 3 mm-10 mm in internal diameter, the side opening of the tubular acoustic resonant cavity (6) is a small hole (4) communicated with the tubular acoustic resonant cavity (6), the small hole (4) is 1.5 mm-2.5 mm in depth and 1.5 mm-2.5 mm in diameter, the opto-acoustic gas sensor is a polyvinylidene fluoride piezoelectric film (5), the distance between the film plane and the end plane of the small hole (4) is 0.1 mm-3 mm, and the output terminal of the opto-acoustic gas sensor is electrically connected with the input terminal of a phase-locked amplifier (8) of the modulation-demodulation component through a pre-amplifier (6). The opto-acoustic gas sensing device has the characteristics of simple structure, larger response band width and stability in operation, and can be widely used for detecting and determining the strength or chemical compositions of gas.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a photoacoustic gas sensing device, in particular to a photoacoustic gas sensing device based on polyvinylidene fluoride piezoelectric film. Background technique

[0002] Detecting and determining the concentration or chemical composition of gases has a wide range of applications in environmental monitoring, climate, agriculture, security, medical diagnostics, and industry. With the development of laser technology and weak signal detection technology, photoacoustic spectroscopy technology has also been developed rapidly, and photoacoustic spectroscopy technology is considered to be a spectral technology with zero background, high sensitivity and high selectivity.

[0003] Photoacoustic spectroscopy is a unique spectroscopic technique that is different from traditional absorption spectroscopy based on the Beer-Lambert absorption law. It is a spectroscopic technique based on the photoacoustic effect. light intensity. When a lig...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More