Hydroacoustic antenna

 

(57) Abstract:

The invention relates to the field of hydro-acoustics. The proposed transducer containing a stranded cable with attached N piezoelectric tranducers, the outputs of which are connected to the N pre-amplifiers, and a test signal generator connected to the N inputs of the piezo-transformers hydroacoustic antenna. The antenna further comprises N electrical equivalents, each of which is made in the form of non-polarized element of the piezoelectric transducer, and each pre-amplifier is made for the differential amplifier, non-inverting input of which is connected to the piezoelectric transducer, and the inverting input to an electrical equivalent. The piezo-transformers, electrical equivalents and pre-amplifiers are combined in removable modules, and multi-conductor cable installed unified seats with the ability to connect to them removable modules. In the simplified control procedure, and it turns out the ability to customize hydroacoustic antenna at its usual place. 1 Il.

The invention relates to the field of hydro-acoustics and can be used DL the th, located at their usual place in the natural environment, such as hydroacoustic antenna.

Known hydroacoustic antenna [1], which checks the health of the piezoelectric tranducers carried out in laboratory conditions after the dismantling of the antenna at the usual place.

The disadvantage of this antenna is the need for its removal to test and re-erecting in position after it testing and lab setting.

Known transducer containing a stranded cable and N piezo-transformers N the respective pre-amplifiers whose outputs are connected to the corresponding signal cable conductors. In addition, the antenna includes a test signal generator connected to the N inputs of the piezo-transformers hydroacoustic antenna [2].

This transducer [2] is adopted for the prototype of the claimed antenna.

The disadvantage of the prototype is the impossibility of performance monitoring hydroacoustic antenna in situ at small values of the change sensitivity of its piezoelectric tranducers and the inability to replace nerabotosposobnaya of the invention, simplification of the procedure for monitoring and obtaining customization hydroacoustic antenna at its usual place.

This technical result is achieved due to the fact that the transducer containing a stranded cable with attached N piezoelectric tranducers, the outputs of which are connected to the N pre-amplifiers, and a test signal generator connected to the N inputs of the piezo-transformers hydroacoustic antenna further comprises N electrical equivalents, each of which is made in the form of non-polarized element of the piezoelectric transducer, and each of the pre-amplifier is made for the differential amplifier, non-inverting input of which is connected to the piezoelectric transducer, and the inverting input to an electrical equivalent, with electric equivalents and pre-amplifiers are combined in removable modules, and stranded cable mounted unified seats with the ability to connect to them removable modules.

The invention is illustrated by the drawing, which shows a functional diagram of hydroacoustic antenna.

Hydroacoustic antenna uklucy pre-amplifier 4.

Hydroacoustic antenna includes a multi-strand cable 5 with N seats 61,..., 6Nto connect to the antenna hydrophones 71,..., 7N. Seats are Germersheim 81,..., 8N. Each hydrophone 7 includes a piezoelectric transducer 2, the electrical equivalent of 3, the differential pre-amplifier 4 and contains a thermal connector 9, which is the response to Germersheim 8 seats 6. The body of each hydrophone 7 has dimensions, the corresponding coupling dimensions seats 6. Seats 6 allow mechanical attachment of hydrophones 7 stranded on the cable 5, and Germersheim 8 and 9 to transmit the electric signals from the hydrophones and the hydrophones.

The antenna on the end has a flange 10 through which connects the test signal generator 1, the processing and recording apparatus 11. The output signals of the differential pre-amplifier through Germersheim 8 and 9 are served at the multi-conductor cable 5 and further to the apparatus 11. On the other hand, the test signal from the generator 1 through a multi-conductor cable 5, Germersheim 8 and 9 is applied to the piezo-transformers 2 and the electrical equivalents 3.

We denote the impedances of the piezoelectric transducer 3 under normal and natural conditions, input resistance (in General complex) einverseremove and inverting inputs of the differential pre-amplifier, the impedance of the electrical equivalent of a piezoelectric transducer, is the complex coefficients of the transmission from the test signal generator 1 to the not inverting input to the inverting input and to the output of the differential pre-amplifier.

Imagine a complex impedance, the input impedance and the transmission ratios in the form of module and phase

< / BR>
< / BR>
< / BR>
Thus, the sensitivity E of the piezo -

E~fz,

where f is the frequency.

In advance, in laboratory conditions it is possible to define and calculate (or measure) the work fz0and Already in the working conditions, measuring parameters of the output signal k and a , it is possible to calculate the modulus and phase of the transmission coefficient and n is about to work fz0you can draw conclusions about the sensitivity of the piezo.

We will consider differential preamplifier is ideal, i.e., the output signal is exactly equal to the difference between signals on reinvestiruet and inverting inputs. Then, if the signal generator sine wave

u(t) = u0sin(t),

where u0and = 2f - amplitude and angular frequency of this signal, the signal at the output of subtractive device

< / BR>
Hence we obtain expressions for the magnitude and phase of the complex coefficient transfer

< / BR>
< / BR>
Measuring k, and knowing k-,-you can calculate the k+,+< / BR>
k2+= k2--k22kk-cos(+--)

< / BR>
the sign in front of the cosine of the difference you need to choose from the condition that the value of k+it would not be negative.

Consider the gear ratio

< / BR>
You can obtain a system of equations for determination of z and

< / BR>
< / BR>
Solving the resulting system of equations for z, we get

< / BR>
In the operating frequency range of the piezoelectric transducer the condition z0<therefore , the transfer coefficients of the k+and k-will be almost equal to 1, and the. the La control over the sensitivity changes, you must select the frequency at which z0z+.

To illustrate the obtained results let us consider the case when the electrical equivalent of 4 selected capacitor. We assume that the input resistance of the differential pre-amplifier 5 are purely active resistors. Considering the impedance of the piezoelectric transducer purely capacitive received

< / BR>
< / BR>
< / BR>
< / BR>
< / BR>
where j is the imaginary unit, and therefore

< / BR>
< / BR>
z+= R+, z-= R-,

< / BR>
< / BR>
< / BR>
+= 0,

-= 0.

Then

< / BR>
thus, the capacitance of the piezoelectric transducer 3 will talk about the changing of its sensitivity. In this case, the

< / BR>
< / BR>
< / BR>
< / BR>
where+= R+C-= R-Ce. The electrical equivalent of 4 select thus to satisfy the condition R+C0= R-Ce=0then the total gear ratio

< / BR>
Under normal conditions =0and k=0. When small changes in the sensitivity of the piezoelectric transducer 2 k0 only at frequencies outside the operating range. Deistvitelno frequency range the condition z0~ z+therefore,0~1 and+~1.. In this case, even when small changes =0+d

< / BR>
note that d = R+(C-C0), i.e., the magnitude of the output signal is directly proportional to the capacitance, and hence the change of sensitivity.

Hydroacoustic antenna to implement the method works as follows.

Set hydroacoustic antenna on its regular place. Include a test signal generator 1 and serves a test signal through the multi-conductor cable 5 in the hydrophones 7 and further to the piezo-transformers 2 and the electrical equivalents 3. Consequently, the output signals of the hydrophones will contain the frequency of the test signal some kind of signal, the amplitude of which is directly proportional to the sensitivity of the piezoelectric transducer 2.

If the magnitude of change sensitivity of any of the hydrophones 7 beyond the limits of acceptable values, then the hydrophone dismantle, replace it with another or adjust the gain of the differential pre-amplifier.

Thus, the procedure of monitoring the health of the piezoelectric tranducers extremely simplified compared to the prototype. Nadig recorded directly change the sensitivity of each piezoelectric transducer antenna. Thus achieved is supplied in the application technical result.

Sources of information

1. U.S. patent 4420825, CL 367-122 (G 01 S 3/80), 1983.

2. Patent Germany 3322765, CL H 04 R 29/00, 1985 - the prototype of the method and device.

3. Pavlov, L. E., Silvestrov S. C. Measurement and control sensitivity piezo-transformers at low frequencies. Measuring equipment, 1979, 11, S. 68 and 69.

Transducer containing a stranded cable with attached N piezoelectric tranducers, the outputs of which are connected to the N pre-amplifiers, and a test signal generator connected to the N inputs of the piezo-transformers hydroacoustic antenna, characterized in that it further comprises N electrical equivalents, each of which is made in the form of non-polarized element of the piezoelectric transducer, and each pre-amplifier is made for the differential amplifier, non-inverting input of which is connected to the piezoelectric transducer, and the inverting input to an electrical equivalent, while the piezo-transformers, electrical equivalents and pre-amplifiers are combined in removable modules, and multi-conductor cable installed unified Jerusalem.

 

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