Calibration of Vector Hydrophones in Deep Water

2013 ◽  
Vol 336-338 ◽  
pp. 303-308
Author(s):  
An Bang Zhao ◽  
Bin Zhou ◽  
Jiang Qiao Li
Keyword(s):  
Hydrostatic Pressure ◽  
Relative Sensitivity ◽  
Direction Finding ◽  
Calibration Laboratory ◽  
Vector Hydrophone ◽  
Frequency Independent ◽  
Vector Direction ◽  
Sensitivity Changes ◽  
Inhibition Performance ◽  
National Defence

To apply vector hydrophone to deep-sea detection, a calibration test of the vector hydrophone under different hydrostatic pressure was taken in the national defence underwater acoustics calibration laboratory. The effect of the relative sensitivity changes between channels on the vector hydrophones direction finding and zero-inhibition performance is explored, and the principle model for the influence of the directivity deviation on vector direction measuring is established. Meantime, the phase compensation between channels is found to be frequency-independent. The omnidirectional method is proposed to compensate the directional rotation. As a result, the influences of the hydrostatic pressure on direction finding are effectively reduced.

Improvement of a Novel MEMS Bionic Vector Hydrophone

2011 ◽  
Vol 213 ◽  
pp. 539-542 ◽  
Author(s):  
Guo Jun Zhang ◽  
Chen Yang Xue ◽  
Xiao Yao Wang ◽  
Ji Jun Xiong ◽  
Wen Dong Zhang
Keyword(s):  
Frequency Response ◽  
Underwater Acoustics ◽  
Directional Pattern ◽  
National Defense ◽  
Test Results ◽  
Calibration Laboratory ◽  
Vector Hydrophone ◽  
Hydrophone Calibration

A novel MEMS vector hydrophone with bionics structure was introduced in 2007. As the acoustic-electric transducer infrastructure and the acoustic package of hydrophone have been optimized, the performance of the hydrophone has been greatly improved compared with the previous. This hydrophone calibration was finished in National Defense Underwater Acoustics Calibration Laboratory of China. According to the test results, the sensitivity of the hydrophone is -165dB（including pre-amplification 20 dB）, the frequency response ranges from 20Hz to 2kHz (±5dB). And this hydrophone has a good directional pattern in the form of "8"-shape.

MEMS Bionic Vector Hydrophone

2012 ◽  
Vol 503 ◽  
pp. 114-117
Author(s):  
Guo Jun Zhang ◽  
Chen Yang Xue ◽  
Ji Jun Xiong ◽  
Wen Dong Zhang ◽  
Xiao Yao Wang ◽  
...  
Keyword(s):  
Frequency Response ◽  
Underwater Acoustics ◽  
Directional Pattern ◽  
National Defense ◽  
Test Results ◽  
Calibration Laboratory ◽  
Vector Hydrophone ◽  
Hydrophone Calibration

A novel MEMS vector hydrophone with bionics structure was introduced in 2007. As the acoustic-electric transducer infrastructure has been optimized, the performance of the hydrophone has been greatly improved compared with the previous. This hydrophone calibration was finished in National Defense Underwater Acoustics Calibration Laboratory of China. According to test results, the sensitivity of the hydrophone is -165dB（including pre-amplification 20 dB）,The frequency response ranges from 20Hz to 2kHz (±5dB). And this hydrophone has a good directional pattern in form of "8"-shape.

Research on the Influence of Hydrostatic Pressure on the Sensitivity of Bionic Cilia MEMS Vector Hydrophone

Measurement ◽  
2021 ◽  
pp. 110606
Author(s):  
Wendong Zhang ◽  
Songxiang Ji ◽  
Xiaoqi Liang ◽  
Guojun Zhang ◽  
Renxin Wang ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Vector Hydrophone

Design of MEMS bionic vector hydrophone based on NBR sound-transparent cap

Sensor Review ◽  
2015 ◽  
Vol 35 (3) ◽  
pp. 303-309 ◽  
Author(s):  
Mengran Liu ◽  
Ze ming Jian ◽  
Guojun Zhang ◽  
Nan Guo ◽  
Wendong Zhang
Keyword(s):  
Frequency Band ◽  
Directional Pattern ◽  
Butadiene Rubber ◽  
Calibration Laboratory ◽  
Content Type ◽  
Vector Hydrophone ◽  
Mems Technology ◽  
Transparent Cap ◽  
Low Sensitivity ◽  
Packaging Structure

Purpose – The purpose of this paper is to present a novel nitrile butadiene rubber (NBR) packaging structure, which can solve the problems of the low sensitivity, narrow frequency band and fluctuating frequency response curve of the MEMS bionic vector hydrophone. Design/methodology/approach – A 0.05-mm-thick NBR sound-transparent cap was designed by theoretical analysis and simulation to reduce the signal attenuation caused by the packaging structure, and the frequency band of the hydrophone has been extended to 4 kHz. In this work, the vector hydrophone was fabricated by the MEMS technology and packaged with the NBR sound-transparent cap. The performance indicators were calibrated in the National Defence Underwater Acoustics Calibration Laboratory of China. Findings – The results show that the sensitivity of NBR-packaged hydrophone reaches −170 dB (±2 dB), and the difference is less than 1 dB compared to bare chip. And the frequency band is 50 Hz-4 kHz. The hydrophone also has good directional pattern in the form of an 8-shape, and the pressure-resisting ability is more than 2 MPa. Originality/value – The packaging structure significantly increases the sensitivity of the hydrophone and broadens the frequency band, providing a new method in the packaging design for MEMS hydrophone.

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