Measurement method of full-band phase coherence of fiber optic hydrophone array
A fiber optic hydrophone and measurement method technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of initial phase difference and the difficulty of measuring the initial phase of the fiber optic hydrophone, and achieve the effect of solving difficult measurement.
Active Publication Date: 2019-01-18
武汉普惠海洋光电技术有限公司
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Problems solved by technology
[0008] The present invention proposes an accurate measurement method for the full frequency band phase consistency of the optical fiber hydrophone system array elements, which can give the initial phase difference of each array element relative to a certain reference element without being limited by the frequency band, thereby solving the problem of Difficult to measure initial phase of fiber optic hydrophone in practical engineering
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[0020] According to the embodiment of the present invention, a method for measuring the full-band phase consistency of an optical fiber hydrophone is disclosed. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the invention. It will be apparent, however, to one skilled in the art that embodiments of the invention may be practiced without these specific details.
[0021] The phase consistency of fiber optic hydrophones refers to the phase interpolation of the demodulated results of each hydrophone unit when two or more fiber optic hydrophones are under the same instantaneous sound pressure.
[0022] Take the fiber optic hydrophone array used in the field of underwater acoustics as an example.
[0023] figure 1 A block diagram 100 of an experimental protocol according to an embodiment of the invention is shown. The block diagram 100 of the test scheme mainly includ...
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The present invention discloses a fiber optic hydrophone array full-band phase consistency measurement method. The method comprises the steps of: taking a first array element of a fiber optic hydrophone array as a reference array element which is vertically arranged a straight line formed by a first sound source, a second sound source, a first reference element and a second reference element, andrecording the position of the first array element; emitting data signals by the first sound source and the second sound source, recording receiving signals of the first receiving element, the second reference element and the first array element, and calculating a first delay and a second delay of the first array element; changing the position, perpendicular to a support, of the fiber optic hydrophone array to allow other measured array elements to reach the position of a last measured array element in order, perform repeated emission of signals and calculate the first delay and the second delay of the corresponding measured array elements; according to a calculated delay result, calculating initial phase difference of each array element relative to the reference elements; and based on thecalculated initial phase differences, performing phase compensation of different array elements of the fiber optic hydrophone array.
Description
technical field [0001] The invention relates to the field of sensor performance measurement, in particular to a method for measuring phase consistency of an optical fiber hydrophone array in all frequency bands. Background technique [0002] With the advancement of science and technology, sensors are widely used in various fields. In the field of underwater acoustic signal detection, the fiber optic hydrophone array, as a high-sensitivity, light-weight, large-aperture underwater acoustic towed detection device, plays an important role in seismic signal detection, environmental detection and underwater safety warning. The principle of the fiber optic hydrophone array used in the lateral direction of the long-range target is to perform phase compensation on the different elements of the array according to the direction of the sound wave, and then perform in-phase superposition, that is, the principle of beamforming. The phase of compensation is mainly calculated based on the ...
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IPC IPC(8): G01S7/52
CPCG01S7/5205
Inventor 申和平张海兵靳湧涛张西建
Owner 武汉普惠海洋光电技术有限公司