Method for measuring insertion loss/ transmission coefficient of underwater sound passive material based on time reversal focusing
A technology of underwater acoustic passive materials and insertion loss, which is applied in the direction of analyzing solids using sound waves/ultrasonic waves/infrasonic waves, which can solve the problems of measurement error and low precision, and achieve the effect of eliminating influence, reducing interference and reducing influence
Inactive Publication Date: 2012-07-18
CSSC SYST ENG RES INST +1
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[0003] In order to overcome the shortcomings of the existing underwater acoustic passive material insertion loss / transmission coefficient measurement technology in the middle and low frequency band test, the measurement result has large error and low precision, the present invention provides a method suitable for the middle and low frequency band, which can effectively reduce the error. , Measurement method of insertion loss / transmission coefficient of underwater acoustic passive materials based on time-reversal focusing with improved accuracy
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[0024] The present invention will be further described below in conjunction with the accompanying drawings.
[0025] refer to Figure 1 to Figure 6 , a measurement method of insertion loss / transmission coefficient of underwater acoustic passive materials based on time inverse focusing, which is used for sound absorption performance testing of underwater acoustic component materials. The technical scheme of the whole measurement method is as follows:
[0026] 1) When the back-launch signal is generated
[0027] First, according to the frequency range to be measured, the signal to be emitted is generated by the measurement system, such as a broadband chirp signal or a narrowband pulsed cosine signal. Then, place the transmitting-receiving transducer near the test sample to be placed (as close as possible to the sample, but not less than a quarter of the signal wavelength), such as figure 1 As shown, it can be used as a time-reversed PS, and can also be used as a hydrophone to...
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Abstract
The invention discloses a method for measuring an insertion loss / transmission coefficient of an underwater sound passive material based on time reversal focusing. The method comprises the following steps of: 1) generating time reversal transmitting signals; 2) acquiring direct signals in the absence of a testing sample, transmitting the time reversal signals generated in 1) by adopting a transmitting-receiving transducer, and recording the direct signals pi in the absence of the testing sample by adopting a hydrophone (generally a transmitting-receiving combined transducer is used as the hydrophone) placed nearby the testing sample; 3) acquiring transmission signals in the presence of the testing sample: putting a passive material sample to be detected at a preset position, transmitting the same time reversal transmitting signals as those in the 2) again by adopting the transmitting-receiving transducer, and recording the signals pt in the presence of the testing sample by the hydrophone; and 4) calculating insertion loss: acquiring the required test sample parameter calculation result by using a transmitting coefficient / insertion loss calculation formula. According to the method for measuring the transmitting coefficient / insertion loss of medium and low frequency bands, errors can be effectively reduced and the precision is improved; therefore, the method is suitable for full-freqeuncy-band measurement.
Description
technical field [0001] The invention relates to a method for measuring insertion loss / transmission coefficient of an underwater acoustic material. Underwater acoustic material components are widely used and crucial underwater components in underwater acoustic engineering. Different application backgrounds have different requirements for the acoustic properties of materials. In order to evaluate the sound absorption performance of materials, it is necessary to carry out tests on relevant sound absorption parameters. The acoustic performance measurement of underwater acoustic passive materials includes the measurement of insertion loss / transmission coefficient, echo reduction / reflection coefficient and other parameters. Background technique [0002] Underwater acoustic material components are widely used and crucial underwater components in underwater acoustic engineering. Different application backgrounds have special requirements for the acoustic properties of materials. W...
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IPC IPC(8): G01N29/11
Inventor 闫孝伟李建龙何元安卢少杰常鹏善王欣孔祥东
Owner CSSC SYST ENG RES INST
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