Infrasonic wave detection device and method

A detection device and detection method technology, applied in the direction of measuring device, measuring ultrasonic/sonic wave/infrasonic wave, using wave/particle radiation, etc., can solve the problems of sensor zero drift, high market price, etc., and achieve low processing accuracy requirements and overall structure simple effect

Inactive Publication Date: 2010-10-27
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology

It is also necessary to consider the influence of environmental conditions on the stiffness of the system, and the "zero drift" problem of the sensor caused by the c

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  • Infrasonic wave detection device and method
  • Infrasonic wave detection device and method
  • Infrasonic wave detection device and method

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Embodiment Construction

[0023] see Figure 4 , which is a front view of the infrasonic wave detection device of the present invention. The infrasonic wave detection device 100 includes a laser 110, a beam expander 120, a diaphragm single-slit device 130, a polarizer 140, and a CCD (charge-coupled device) light receiving system 150 arranged on a straight line in sequence. It also includes a single-chip microcomputer and a display screen (not shown).

[0024] Please also see Figure 5 ,actually Figure 4 The top view of the infrasonic detection device shown. The diaphragm single-slit device 130 includes a first blade 132 a , a second blade 132 b and a sensitive diaphragm 134 . The first blade 132a and the second blade 132b are arranged on a plane perpendicular to the optical axis of the laser, and are separated to form a single slit A through which the laser passes. The sensitive diaphragm 134 is arranged on a plane parallel to the laser optical axis and the single slit A, and is in vertical conta...

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Abstract

The invention relates to an infrasonic wave detection device which comprises a laser device and a vibrating diaphragm single-slit device, wherein the laser device is used for generating a laser beam; the vibrating diaphragm single-slit device comprises two cutter blades and a sensitive diaphragm; the two cutter blades are arranged on the same plane and separated from each other to form a single slit; one of the cutter blades is arranged in the deformation region of the sensitive diaphragm; the sensitive diaphragm is arranged in the infrasonic wave region; and the laser beam passes through the single slit and generates single slit diffraction fringes. The infrasonic wave enables the sensitive diaphragm to generate vibration, so that the cutter blades slightly vibrate to change the width of the single slit and further enable the single slit diffraction fringes to change. By detecting the infrasonic waves with the single slit diffraction fringes of the laser beam, the infrasonic wave detection device has the advantages of simple overall structure, low requirements for working accuracy of devices, low manufacturing cost and easy realization.

Description

technical field [0001] The invention belongs to the field of infrasonic wave detection, in particular to an infrasonic wave detection device which adopts single-slit diffraction to detect infrasonic waves. Background technique [0002] The frequency range of infrasound is below 20Hz, which is inaudible to the human ear. At present, the detection device for detecting infrasonic waves is generally a capacitive infrasound sensor, which is mainly divided into two types: single capacitor and double capacitor. [0003] see figure 1 , which is a schematic structural diagram of a single-capacitance infrasound detection device in the prior art. The single capacitor infrasound detection device 10 includes a sealed container 12 , a pole plate 14 , a sensitive diaphragm 16 and a primary sound receiving circuit 18 . The pole plate 14 is fixed in the sealed container 12 and separates the sealed container 12 into a front cavity 122 and a rear cavity 124 . The front chamber 122 and the ...

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Application Information

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IPC IPC(8): G01H9/00
Inventor 唐小煜黄佐华林丽芬沈娴吴丽菲
Owner SOUTH CHINA NORMAL UNIVERSITY
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