Infrasonic wave detection apparatus

Abstract

An infrasound testing device consists of an infrasound sensor, a lowpass, an analog-digital converter, an SCM and an LCD which are respectively connected with a battery, wherein, the output end of the infrasound sensor is connected with the input end of the lowpass, the output end of the lowpass is connected with the input end of the analog-digital converter, the output end of the analog-digital converter is connected with the input end of the SCM, and the output end of the SCM is connected with the LCD. An amplitude modulation principle is utilized to measure the slow changes of a capacitance microphone, an acoustic compliant element in the infrasound sensor acts as an arm of the capacitance bridge, the input end is connected with a high-frequency voltage with same amplitude, when the infrasound wave acts on the film, the film generates a displacement with the change of the sound pressure, which result in the capacitance changes of the plate capacitor, so that the balance of the capacitance bridge is changed, therefore, the output end can obtain amplitude modulation wave modulated by the capacitance change, the amplitude modulation wave is sent to a modern after the voltage is amplified, then the low-frequency electrical signals are gained, and the detection of the infrasound wave is achieved.

Description

technical field [0001] The invention relates to an infrasound detection device, which is especially suitable for the detection and research of disasters such as earthquakes, gas outbursts, mud-rock flows, and environmental infrasound. Background technique [0002] Disasters such as earthquakes, gas outbursts, and mudslides are extremely destructive. If the information of these disasters cannot be detected in time and accurately, it will seriously affect the safety of people's lives and property. For the detection of these disasters, the existing devices for detecting these disasters include earthquake detectors, gas detectors, geoacoustic detectors, etc., all of which have some shortcomings: 1. The response speed is slow, and the disaster information cannot be detected in time. 2. The anti-interference ability is poor, the sensitivity is not high, and the disaster information cannot be accurately detected. 3. There are too many device accessories, the connection is cumberso...

AI Technical Summary

Problems solved by technology

[0002] Disasters such as earthquakes, gas outbursts, and mudslides are extremely destructive. If the information of these disasters cannot be detected in a timely and accurate manner, it will seriously affect the safety of people's lives and property.

For the detection of these disasters, the existing devices for detecting these disasters include earthquake detectors, gas detectors

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