Infrasonic wave detection apparatus and detection method thereof

Abstract

The invention discloses an infrasonic wave detection apparatus and a detection method thereof. A diode laser, a laser beam expander, a movable blade and a detector are installed in a housing successively from left to right; and a groove cooperating with the movable blade is formed in the inner wall of the housing. The upper end of the movable blade passes through the side surface of the housing and then is connected with a sensitive film piece; two protrusions are arranged at the two sides of the lower end of the movable blade; an acceleration sensor is embedded inside the sensitive film piece; and a displacement sensor is embedded into the movable blade. The detector is connected with an intelligent mobile terminal by a data acquisition card; and the intelligent mobile terminal is used for converting mechanical vibration information detected by the acceleration sensor a vibration signal power spectrum, thereby determining whether an infrasonic wave exists at a to-be-detected position. Calculation of the strength and frequency of the infrasonic wave is carried out according to the light intensity detected by the detector and data detected by the displacement sensor and a result is outputted. According to the invention, the overall structure of the apparatus is simple; the requirement of the processing precision of the device is low; the manufacturing cost is low; and the apparatus and method are easy to realize.

Description

technical field [0001] The invention relates to the field of infrasonic wave detection, in particular to an infrasonic wave detection device and a detection method thereof. Background technique [0002] Infrasonic waves, also known as subsonic waves, generally refer to the frequency at 10 -4 Sound waves between Hz and 20Hz. Under normal circumstances, subsound waves do not cause human hearing. Like audible sound waves, infrasound waves are generated by mechanical vibrations of various objects, and spread to the surroundings through the vibrations of various elastic media. Scientific research has found that many natural phenomena, such as sea storms, volcanic eruptions, earthquakes, tsunamis, lightning and thunder, waves hitting the shore, typhoons, magnetic storms, aurora, hail, etc., can be accompanied by the occurrence of infrasound waves; In related activities, such as nuclear explosions, aircraft, rockets, and missiles flying, artillery launches, infrasound frequency ...

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Problems solved by technology

[0004] Most of the current infrasonic detection equipment is a capacitive infrasonic sensor, which requires fine structure, rigorous design, strict material selection, especially high processing accuracy, and its main parts require ultra-finishing. In order to ensure its long-term stability, it is necessary to Choose the best insulator, high cleanliness is also required in the system, etc., the influence of environmental conditions on the stiffness of the system must also be considered, and the "zero drift" problem of the sensor caused by the change of ambient temperature; in addition, the current infrasonic wave detection equipment is mostly used for The early warning and monitoring of natural disasters such as earthquake prediction and ocean storm warning are single in type and expensive, and are not suitable for daily civilian use

The mobile phone has now become an indispensable electronic product in people's daily life. It is not feasible to simply use the microphone in the mobile phone to detect infrasound waves, because the minimum pickup frequency of the mobile phone microphone is usually higher than 20Hz, and it cannot detect frequencies lower than 20Hz. 20Hz infrasound

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