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Hydrophone possessing on-line self calibrating function

A self-calibration and hydrophone technology, applied in the field of sensors, can solve difficult problems and achieve the effect of eliminating background noise and high signal-to-noise ratio

Active Publication Date: 2009-07-15
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Online calibration with these two methods is difficult to achieve

Method used

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  • Hydrophone possessing on-line self calibrating function
  • Hydrophone possessing on-line self calibrating function
  • Hydrophone possessing on-line self calibrating function

Examples

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Embodiment 1

[0024] The present invention will be described below by taking a cylindrical piezoelectric hydrophone as an example. Such as figure 1 As shown, the outermost surface of the hydrophone is a sealed casing 1, which is generally made of stainless steel and has a certain pressure resistance. A layer of outer insulating layer 2 is attached to the inner surface of the housing. In this embodiment, the insulating layer is made of ceramic electronic insulating material AL203. The making material of insulating layer of the present invention is not limited to ceramic material, also can be other insulating materials, as, mica, resin etc., but requires larger rigidity (its rigidity is greater than 3 to 6 times of sensitive element), promptly in The amount of deformation is very small when the force is applied (under the same force, the deformation is less than 1 / 10 of the sensitive element). Install a layer of metal mesh on the inner surface of the insulating layer to form the external ex...

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Abstract

The hydrophone possessing on-line self calibrating function includes one casing, sound absorbing material, one piezoelectric sensing element, one inner pole and one outer pole across the piezoelectric sensing element, and one signal processing circuit, as well as one inner exciting pole outside the outer pole, one outer exciting pole inside the casing, one inner insulating layer filled between the inner exciting pole and the outer pole, one outer insulating layer filled between the outer exciting pole inside the casing, and dielectric filled between the inner exciting pole and the outer exciting pole. Owing to the on-line self calibrating and compensating function, the hydrophone of the present invention can operate in unmanned condition for long term.

Description

technical field [0001] The invention belongs to the field of sensors, in particular, the invention relates to a hydrophone with an online self-calibration function. Background technique [0002] Hydrophones will age with time during long-term use, and aging will change the sensitivity of the hydrophone, thereby affecting the accuracy of the measurement. Therefore, the measuring hydrophone needs to be calibrated every once in a while. Hydrophones are usually used for underwater measurements for a long time, such as noise monitoring of ships, sonar systems, etc. The requirements for installation are very high, and the process is relatively complicated, so the cost is relatively high. They are one of the work requirements for long-term use, but due to aging reasons, they are usually disassembled for calibration, which is expensive and difficult to construct. [0003] The current calibration methods are roughly divided into two types, one is the free-field reciprocal method, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00H04R1/44G01S7/521
Inventor 程晓斌李晓东
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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