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《Nuclear Electronics & Detection Technology》 2003-05
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A high sensitivity wide-band infrasound condenser microphone

XIE Jinlai, TAO Zhongda,XIE Zhaohua(Institute of Acoustics, CAS, Beijing 100080, China)  
The new type infrasonic condenser microphone has been made in Institute of Acoustics, CAS. It has many features, such as: the sensitivity is high, 0.1μbar infrasound pressure can be received; frequency band is wide, cover all infrasonic frequency range, from 10Hz to 0.001 Hz bellow; output volt is large, such as 400mV/Pa, then can be directly converted by A/D; dynamic range is wide, the most high sound level≥108dB; frequency response is good flat in frequency band necessary; longterm stability of operation is good; the outside of back volume keeps vacuum and prevent with plastic(freedom from zero drift); consistent is good, the head capacitance co, the first resonance frequency of stress of membrane and circuit can be adjusted, so can be used to in the infrasound array; volume is small, φ80×220mm, weight is light, 1.6kg, and easy to potable and installation; membrane mass is small, freedom from vibration, no sense to shock; forms a complete configuration, can be connected with PC and structured infrasound monitoring system. Adding triangle array, it can be got infrasonic arrival time, the most amplitude and period of it, wave direct, wave horizontal tracing velocity and realtime 3D dynamic spectrum and so on.
【CateGory Index】: TP212.1
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