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Infrasound airborne sound calibration device

A calibration device, airborne sound technology, applied to measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve problems that cannot meet the needs of actual use, air leakage, and difficult corrections, etc., so as to facilitate installation and realization. Airtightness, the effect of solving traceability problems

Pending Publication Date: 2022-05-24
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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AI Technical Summary

Problems solved by technology

As the frequency decreases, the air leakage will be more serious and it will be more difficult to correct, so it is not suitable for too low frequency, the calibration frequency range is (0.1~20)Hz
In practical applications, the frequency of many subsonic signals is lower than 0.1Hz, and the existing devices cannot meet the needs of actual use

Method used

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  • Infrasound airborne sound calibration device

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Embodiment Construction

[0023] The implementation of the present invention will be described in detail below with reference to the accompanying drawings and examples.

[0024] like figure 1 As shown, an infrasound air sound calibration device disclosed in this embodiment includes a motor motion system, a bellows assembly 20, a laser vibrometer 25, a sealed cavity 16, a differential pressure sensor 12, a reference cavity 10, a measurement and control system 2, Standard infrasound sensor 13 and calibrated infrasound sensor 14. The motor motion system drives the bellows assembly 20 to reciprocate through the connecting rod 21, and generates sinusoidal infrasound waves in the sealed cavity 16; the laser vibrometer 25 calculates the infrasound sound pressure level in the sealed cavity 16 by measuring the displacement of the motor moving parts, and realizes The absolute calibration of the infrasound sensor; the reference cavity 10 and the sealed cavity 16 communicate with each other through the differenti...

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Abstract

The invention discloses an infrasound airborne sound calibration device, and belongs to the field of infrasound sensor calibration. The device comprises a motor motion system, a corrugated pipe assembly, a laser vibration meter, a sealing cavity, a differential pressure sensor, a reference cavity, a measurement and control system, a standard infrasound sensor and a calibrated infrasound sensor. The motor movement system drives the corrugated pipe assembly to reciprocate through the connecting rod, and sine infrasonic waves are generated in the sealing cavity. The laser vibration meter calculates the infrasound pressure level in the sealing cavity by measuring the displacement of a motor moving part, and absolute calibration of the infrasound sensor is achieved; the reference cavity is communicated with the sealing cavity through a differential pressure sensor; the measurement and control system is used for collecting sensor output signals and performing feedback control through a computer; the standard infrasound sensor and the calibrated infrasound sensor are installed in the sealing cavity, and relative calibration of the infrasound sensors is achieved through a comparison method. According to the invention, low-distortion (0.01-20) Hz infrasound pressure signals can be generated, and traceability of the ultralow-frequency infrasound sensor is realized.

Description

technical field [0001] The invention relates to an infrasound air sound calibration device, which belongs to the field of infrasound sensor calibration. Background technique [0002] Infrasound waves widely exist in nature and human activities, such as earthquakes, volcanic eruptions, debris flows, nuclear explosions, supersonic flight, weapon targeting, etc. Infrasound waves have the characteristics of strong penetrating ability, long propagation distance, and low attenuation, and are widely used in environmental monitoring. , military field, industrial production and other fields. [0003] The monitoring of the infrasound sound pressure signal mainly relies on the infrasound sensor, and the accurate measurement of the infrasound sound pressure mainly depends on the calibration of the infrasound sensor. The accurate value of the infrasound sensor is the premise and guarantee for the application of the sensor. The calibration methods of infrasound sensors mainly include cou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00G01D21/02
CPCG01H9/00G01D21/02
Inventor 徐佳张炳毅付强郑爱建
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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