This standard specifies the measurement method of the phase consistency of hydrophones of underwater acoustic arrays. This standard is applicable to the comparative measurement of hydrophones of the same type with a frequency range of several hundred Hz to several tens of kHz. GB/T 16165-1996 Hydrophone Phase Consistency Measurement Method GB/T16165-1996 Standard Download Decompression Password: www.bzxz.net

ICSF7:140
National Standard of the People's Republic of China
GB/T16165—1996
Measurement method of hydrophonephast consistellcy
Published on January 25, 1996
Implemented on October 1, 1996
Published by the State Administration of Technical Supervision
National Standard of the People's Republic of China
Measurement method of bydruphunephase consistellcy eunsislency
1 Subject content and scope of application
This standard specifies the measurement method of underwater high-rise drop curtain element water phase consistency, GD/T76165-1996
This standard specifies the range of pressure from several to ten types of hydrophones. 2 Reference standards
B3223 Hydroacoustic transducer self-standard method GH 3347 Acoustic Terminology
G796% Acoustic Words Water Acoustic Transducer Measurement Field
3 Terms, Symbols and Codes
Terms, symbols and codes used in this standard: In addition to complying with the provisions of GB3223 and GB314B735, the following codes are also specified.
3.1 Phasecosistncy
The phase difference between the outputs of two water-based listening devices under the same residual voltage. 4 Measurement
4.1 Prototype
The reference hydrophone and the test hydrophone (1.2.3) are placed in the sound field emitted by the transmitter to receive the sound pressure. The phase of the sound pressure output by the transmitter is composed of two parts: one is the phase value of the sound pressure at different positions in the sound field, and the other is the phase consistency of the hydrophone. The reference hydrophone is fixed in the sound field and does not change. The tested hydrophone is replaced in the sound field with a relative position unchanged. Each time: the relative difference is obtained, the phase of the two hydrophones is obtained according to the mathematical formula (1):
In the formula: , — the position of the two hydrophones is the effectiveness of the position of the two hydrophones, \> or, — are the two tested hydrophones and the difference in the relative position of the two hydrophones for the hydrophone respectively. Value, \ or a. 4.2 Review of source equipment
(1)
The driver should note that all new sources should be operated under the conditions of GB3223 Appendix, CB75.
4.3 Preparation
Before viewing, use disinfectant to clean the surface of the hydrophone and the transmitter. Do not soak them in water to make the surface of the energy transmitter fully wet. Approved by the National Technical Supervision Bureau on January 25, 1996
Implementation on October 1, 1996
GH/T16165-1996
One pool, the pool time is not less than 24. The pressure transducer is installed on the support and placed in the test depth for a certain period of time. If the pressure reaches a flat level, the system reading is obtained. The measurement system must be stable or unchanged for hours before it can be officially tested. 4.4 Measurement system
4.4.1 Quantity accumulation system diagram
Measurement system diagram: 1. Correct position verification
Modify the equipment, batch and total specifications, transmitter
Transmitter: 1. Includes the long-term listening, dynamic listening, and more listening devices 2. Includes the active listening device, and the listening device, filter station 4.4.2 The selection of water analyzers
The water analyzer should be considered in accordance with the type of water to be measured. It should be a water analyzer with high stability. 4.4.3 Transducer storage requirements
Install the transmitter, etc. on a measurement stand with good performance to protect the water to be measured. The distance from F should be slightly the same as that of the measuring station. The distance between the two measuring stations should be kept constant to avoid the introduction of string vibration or shooting. The distance between the two measuring stations should be kept constant to avoid the introduction of string vibration or shooting. The distance between the two measuring stations should be kept constant to avoid the introduction of string vibration or shooting. The distance between the two measuring stations should be kept constant to avoid the introduction of string vibration or shooting. The distance between the two measuring stations should be kept constant to avoid the introduction of string vibration or shooting. The distance between the two measuring stations should be kept constant to avoid the introduction of string vibration or shooting. The distance between the two measuring stations should be kept constant to avoid the introduction of string vibration or shooting. The distance between the two measuring stations should be kept constant to avoid the introduction of string vibration or shooting. The distance between the two measuring stations should be kept constant to avoid the introduction of string vibration or shooting. The distance between the two measuring stations should be kept constant to avoid the introduction of string vibration or shooting. The distance between the two measuring stations should be kept constant to avoid the introduction of string vibration or shooting. The distance between the two measuring stations should be kept constant to avoid the introduction of string vibration or shooting. The distance between the two measuring stations should be kept constant to avoid the introduction of string vibration or shooting.
4.5 Position measurement
According to different conditions, the following four methods can be used for reverse measurement. 1.5.1 Under the condition that the white field is met, the single wave signal can be used to directly read the position difference of the measured parameter number by the phase meter.
If the position meter accuracy is better than 1, the random error rate is about 2~, then the position measurement uncertainty obtained by this method is within the ±4\ range. 4.5.2 Under the condition of the acoustic field where the reflected wave cannot be ignored, the reflected wave signal can be used to read the reference signal phase difference according to the sweep phase oscillation method (such as: inverse function analyzer, two-way analyzer, swept frequency gain analyzer, etc.). See Figure 2 for the test method.
CB/T16165—1996
Report on the measurement of the signalwww.bzxz.net
·Love the instrument. Dream test water level. Wai to the water listening department.
Two public
Choose a 2-way sweep rate: and the reflected wave frequency changes with the filter band. The loss band is within the recognition point, and the reflected wave frequency is between the passing information. The limit should be the case of formula (2) and formula (3): Ar
where:
sweep fun car Iz/
a random wave section, Hx:
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a music and direct sound difference.
method file into a consistent list of all the shops in the same 4.5.1, 2
4.5.3 non-limited request When measuring, the ball can be used to scan the measured signal band based on fast Fourier transform (FFT) method:
, the signal is counted, and the bit difference value of the signal is determined on the basis of the bit difference. In the above signal processing ratio, the sampling rate and the number of bits must be high enough, and the number of sampling points N must be large enough to ensure sufficient measurement. Some of the finger sense, to ensure that the instrument range of the software and the chain and the sound difference of the person to ensure sufficient data, 8 not less than 8bit, not less than 512 points, the sampling frequency is 20 times higher than the measurement frequency, and N must include as much steady-state part as possible, but not including the shot. The readings should be taken by multiple measurements of the FT coupons, the number of measurements depends on the signal earning ratio. The phase consistency measurement determined by this method is within 35 when the error is about 3~4.
4.5.1 In the case of difficulties in the implementation of the above measurement method or when the measurement accuracy is not very high, the whole signal comparison operation can also be used. Attachment A (reference)
GA/T16165—1996
Appendix A||t t||Seasonal test signal comparison method
(reference drop)
A1 When the conditions of far field to self-field are met, the long standard impulse self-pressure signal of the transmitting signal source can be used as the reference comparison signal if it replaces the reference system!
Xie test method diagram see Figure A
Morning test note number
Chen Zuohao
Ban Xingban Dahao
Zhengchu Zhongyuan
F-sending time.m
The pulse degree of the reference signal is enough, let the signal be high and high (the recording signal and the receiving signal have a part of the same overlap, use the shifter to change the phase of the reference signal, observe the case on the display, add the zero phase indication (such as Li Chengdeng part of the phase missing data to obtain the phase value of the device. The phase property of the device can be obtained by formula A1.
A? When there is no standard phase shifter, there is a disabled type F and a phase shifter, the test method is shown in Figure A2.
Beijing Yisheng!
East China General
(A1)
GB/r15165-1996
Use the old phase shifter to change the phase shift (and amplitude) of the continuous electric signal, and the fast oscilloscope will indicate the phase shift (double case Lissajous figure, or the electric signal pulse waveform must be zero value), use the meter to read the measured hydrophone's pass value, and the formula (1) can be used to evaluate the position-causing phase shifter. If the machine position meter is in the state of 1, the zero value indication error is 4, and the test is about 2*~.4. If the rate is below 2kHz, the standard shall be replaced by the standard. Additional explanation: This standard is proposed by China National Corporation. This standard is drafted by the State-owned No. 72 Factory, the Chinese Academy of Sciences, the No. 71 Institute, the No. 612 Institute, the University of Harbin, etc. This standard is approved by the predecessors.
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