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JPH0879898

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DESCRIPTION JPH0879898
[0001]
BACKGROUND OF THE INVENTION The present invention relates to an underwater wave
transmitter or a water wave receiver of known sensitivity, and the reference wave unit and an
underwater wave transmitter or a water wave receiver of unknown sensitivity. The unit is
suspended in water in combination, and the underwater sound transmission and reception
measures the sensitivity of the underwater wave transmitter or underwater wave receiver of
unknown sensitivity by measuring the underwater sound transmission time and the reception
amplitude of the direct wave by the pulse method. The present invention relates to a sensitivity
tester for a wave device.
[0002]
BACKGROUND OF THE INVENTION Standard calibration is used to determine the performance of
the underwater wave transmitter (hereinafter referred to as a wave transmitter) or the sensitivity
of an underwater wave receiver (hereinafter referred to as a wave receiver). It has been common
practice to combine a transmitter or receiver of known sensitivity with a transmitter or receiver
of unknown sensitivity to perform measurements in a water tank facility or the like with no
fluctuations in water flow.
[0003]
The measurement apparatus shown in FIG. 4 is conventionally used for measurement of a
transducer of unknown sensitivity using a measurement and a reference device for obtaining a
reference device, and a transmitter and a receiver are They are combined and arranged at the
required distance d, and measurement is performed by the pulse method.
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[0004]
Here, the measuring apparatus shown in FIG. 4 includes a transmitter 21, a frequency counter
22, a rectangular wave modulator 23, a power amplifier 24, a variable resistance attenuator 25, a
switch 26, a preamplifier 27, and a voltage amplifier 28. , A band-pass filter 29 and an
oscilloscope 30, and a transmitter 31 and a receiver 32 are connected in parallel with the
variable resistance attenuator 25 at a required distance d between the power amplifier 24 and
the switch 26. It is supposed to be
In this measuring apparatus, a sine wave of a predetermined frequency is transmitted from the
transmitter 21 by counting of the frequency counter 22, and this transmission signal is pulsed by
the rectangular wave modulator 23 and power amplified by the power amplifier 24. It is sent to
either the selected transmitter 31 side or the variable resistance attenuator 25 side.
[0005]
Then, in order to obtain a reference, three sets of transducers a, b and c of unknown sensitivity
are prepared. For example, in the first set, the transducers a and b are as follows: The sensitivity
product between the transducers a and b is measured by the measuring device shown in FIG. 4
by combining different transducers a and b.
More specifically, in the first set, the transmitter-receiver a and the transmitter-receiver b are
combined, and the switch 26 on the transmitter-receiver b side receives the transmitter-receiver
b from the transmitter-receiver a. After the signal is displayed on the oscilloscope 30, the variable
resistance attenuator 25 is switched to the variable resistance attenuator 25 side, and the
variable resistance attenuator 25 is adjusted so that the amplitude of the waveform on the
oscilloscope 30 becomes the same. The value of the unit 25, ie, the sensitivity product, is read.
Thereafter, the second set is combined with the transmitter / receiver b and the transmitter /
receiver c, and the third set is combined with the transmitter / receiver c and the transmitter /
receiver a to perform a total of three measurements. Then, the unknowns of all the transducers a,
b and c are obtained based on the three sensitivity product measurement results and the
relational expressions when the impedances to the frequencies of the individual transducers a, b
and c are measured. Calculate the sensitivity.
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[0006]
The above-mentioned measuring device is fixedly installed in a water tank facility as a standard
underwater acoustic wave standard device for the purpose of performing sensitivity calibration
of a standard wave transmitter and a wave receiver, and it is not intended to measure the
acoustic signal to be measured. For example, the electric interference noise is maintained and
managed as a high-precision measuring device reduced or eliminated so as not to leak from the
switch 26.
[0007]
Next, in the case of grasping the performance of a transducer of unknown sensitivity in an
acoustic sounding apparatus fixedly installed on the hull of a measuring ship, the reference
transmitter 31 or the reference receiver obtained by the above-described mutual calibration is
used. Attach the waver 32 firmly from the deck of the measuring vessel to the tip of the boat,
project it from the boat side and suspend it in the sea, and reduce the variable resistance due to
the switching operation of the switch 26 in the same way as when measuring the reference
device. The measurement is performed by operating the device 25.
[0008]
Then, assuming that the suspended position is the inter-device distance d between the acoustic
probe and the reference device, the unknowns of the transmitter and the receiver from the
following calculation formula based on the measurement result by the above-mentioned
measuring device The sensitivity was calculated.
[0009]
For example, in the case of calculating the unknown sensitivity as a wave receiver in the acoustic
sounding device, it can be obtained by measuring the wave transmission applied voltage, the
wave reception voltage and the distance.
The relationship in that case is (1), and the wave receiving sensitivity can be determined by (2)
by rewriting (1).
[0010]
S0 + SE -20logd + M0 + AG = ME (1) M0 = ME-(S0 + SE -20logd + AG) (2) where M0: reception
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sensitivity (dB) of the acoustic probe [dB re 1 V / μPa ]
[0011]
[Equation 1]
[0012]
VP: Amplitude (V) S 0 of oscilloscope: Transmission sensitivity (dB) of reference transmitter [in
dB re 1 μPa / V, 1 m]
[0013]
[Equation 2]
[0014]
VS: Oscilloscope amplitude (V) d: inter-device distance (m) [= c × t] c: speed of sound in water (=
1500 m / sec) t: sound wave transmission time (sec) AG: receiving system Voltage amplification
(dB)
[0015]
Further, in the case of calculating the unknown sensitivity as a transmitter in the acoustic
sounding apparatus, the equation (1) can be rewritten to obtain the following equation (3).
S0 = ME-(SE-20logd + M0 + AG) (3)
[0016]
However, in the above-described conventional measuring device, the inter-device distance d
between the transducer mounted on the ship body and the like and the suspended reference
device is the water flow and the measuring vessel The waveform amplitude on the oscilloscope
also fluctuates as it fluctuates due to oscillation or the like.
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For example, if the reference moves away from the acoustic probe due to motion and the interdevice distance d increases, the amplitude decreases, and if the reference approaches the
acoustic probe and the inter-device distance d decreases, the amplitude increases.
For this reason, even if the variable resistance attenuator 25 is adjusted to match the amplitude
under the fluctuation of the distance d, it can not be easily matched.
In addition, since the inter-chamber distance d changes momentarily due to the water flow, the
fluctuation of the measurement ship, etc., it is difficult to obtain accurate data.
[0017]
Therefore, in order to obtain the unknown sensitivity of the transducer, the above-described
measurement and calculation are repeated to obtain an average value of several measurement
data, as shown in FIG. Even if a high-precision measurement device is used, there is a problem
that the data often becomes poor in quality, although it takes a long time for measurement.
[0018]
Therefore, in order to solve the above-mentioned problems, the present invention eliminates the
manual reading operation of fluctuating waveform amplitude under motion, and reduces the
measurement time and improves the measurement accuracy. The purpose is to provide a tester.
[0019]
SUMMARY OF THE INVENTION In order to achieve the above object, the sensitivity tester for an
underwater transducer according to the present invention comprises a combination of a
reference transmitter of known sensitivity and a receiver of unknown sensitivity or an unknown
The transmitter and receiver of the unknown sensitivity are tested by suspending the transmitter
and the receiver by a combination of a transmitter of sensitivity and a reference receiver of
known sensitivity at a predetermined distance from each other In the underwater transducer
sensitivity tester, a transmission signal transmitted from the transmitter of the unknown
sensitivity or the reference transmitter, and a reception signal received by the receiver of the
unknown sensitivity or the reference receiver. Is displayed as a still screen, and between the
reference transmitter and the receiver of unknown sensitivity or between the transmitter of
unknown sensitivity and the reference receiver based on the waveform of the still screen. Display
measurement means for measuring the arrival time of the signal wave and the amplitude of the
direct wave; It is characterized in that display measuring means is provided with calculating
means for calculating the unknown sensitivity of the transmitters and receivers on the basis of
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data of the amplitude of the arrival time and the direct wave of the signal wave measured.
[0020]
[Operation] When testing a receiver of unknown sensitivity, the receiver of unknown sensitivity
is combined with a reference transmitter of known sensitivity to separate the transmitter and the
receiver by a predetermined distance. Hang in the water.
In this state, when a transmission signal is transmitted from the reference transmitter, this
transmission signal is received by a receiver of unknown sensitivity and output to the display
measurement means.
The display measurement means instantaneously records the signal waveform at that time even
if the distance between the transmitter and the receiver (inter-device distance) fluctuates and the
waveform amplitude fluctuates.
Then, the signal waveform recorded at an arbitrary time point is displayed as a still screen, and
the arrival time of the signal wave between the reference transmitter and the receiver of
unknown sensitivity and the amplitude of the direct wave are measured to calculate Output to
The calculating means calculates the unknown sensitivity of the receiver based on the data
measured by the display measuring means.
When testing a transmitter of unknown sensitivity, the same measurement and sensitivity
calculation are performed by combining the transmitter of unknown sensitivity and the reference
receiver of known sensitivity.
[0021]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the sensitivity
tester for an underwater transducer according to the present invention will be described with
reference to the drawings.
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[0022]
FIG. 1 is a measurement system diagram showing an embodiment of the sensitivity tester for
underwater transducers according to the present invention, FIG. 2 is a diagram showing the
setup state of the tester, and FIG. 3 is a waveform of digital memory in the tester. It is a wave
form diagram of a transmitting signal and a receiving signal displayed on a display.
[0023]
The tester according to the present embodiment includes a synthesizer (oscillator) 1, a power
amplifier 2, a preamplifier 3, a high pass filter 4, a digital storage type waveform display (display
measurement means) 5, a personal computer (calculation means 6), and a printer (external
output means) 7.
This tester is used to test the unknown sensitivity of the transducer 9a of the acoustic probe 9
mounted on the measuring vessel 8, and when measuring the sensitivity of the transducer 9a, as
shown in FIG. The measurement system can be set up by bringing each of the devices that make
up the equipment to the site and stacking them.
[0024]
The synthesizer 1 pulsates the rectangular wave transmission signal for each predetermined
frequency to be measured and outputs it to the power amplifier 2.
At the same time, a synchronization signal for determining the waveform is output to the digital
storage type waveform display 5.
[0025]
When the power amplifier 2 measures the unknown sensitivity of the acoustic probe 9 as the
wave receiver of the transducer 9 a, the reference transmitter 10 a is connected to the output
terminal of the power amplifier 2. When measuring the unknown sensitivity of the transducer 9a
as a transmitter, the transducer 9a of the acoustic probe 9 is connected to its output terminal.
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The power amplifier 2 performs necessary power amplification on the transmission signal (pulse
wave) from the synthesizer 1 and transmits the power-amplified transmission signal to the
reference transmitter 10a suspended from the side of the measuring vessel 8 or The voltage is
sent to the transducer 9 a of the sound detection device 9 and its terminal voltage is measured
by the digital storage type waveform display 5.
[0026]
The preamplifier 3 receives the transducer 9a of the acoustic probe 9 disposed at a
predetermined distance (this distance is referred to as an inter-device distance d and is based on
1 m) from the reference transmitter 10a. The amplitude of the received signal that has been
waved or received by the reference receiver 10 b is amplified and sent to the high-pass filter 4.
[0027]
The high-pass filter 4 is intended to cut off the main low-frequency noise component that
interferes with the measurement among the received signal (pulse wave) containing noise that
has been impedance converted and amplitude amplified by the preamplifier 3. A signal of
frequency is passed to be sent to the digital storage type waveform display 5.
[0028]
As a measurement function, the digital storage type waveform display 5 automatically applies a
voltage VS applied to the reference transmitter 10a or the transducer 9a of the acoustic probe 9
based on the transmission signal from the power amplifier 2. I am measuring.
Also, it automatically measures the transmission time d / c and the amplitude VP from the
transmission of the transmission signal from the synthesizer 1 to the reception of the direct wave
by the transmitter / receiver 9a or the reference receiver 10b of the acoustic probe 9. And each
measured data is sent to the personal computer 6.
Furthermore, as a display function, while synchronizing with the synchronization signal from the
synthesizer 1, for example, as shown in FIG. 3, the acoustic waveform (signal waveform) of the
transmission signal and the reception signal at any time is instantaneously recorded and
displayed. The recorded waveform can be observed on a still screen. In addition, the time on the
horizontal axis and the amplitude on the vertical axis can be arbitrarily designated by moving the
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cursor on the screen to enable numerical display and enlarged display.
[0029]
Data of the amplification degree of the preamplifier 3 and the high-pass filter 4 of the reception
system measured in advance with respect to the measurement frequency are program input to
the personal computer 6, and a digital storage type waveform display The transmission
sensitivity or the reception sensitivity is program-calculated as the transmitter / receiver 9a of
the acoustic probe 9 of unknown sensitivity from the equation (2) or (3) described above based
on the data from 5. Also, the data from the digital storage type waveform display 5 is inserted
into an external storage means such as a floppy disk, etc., and the sensitivity to the directivity
characteristic including the result of the wave transmission sensitivity of the transducer 9a and
the wave reception sensitivity calculated by programming The printer 7 prints out various
analysis results such as the linearity characteristic of the above.
[0030]
Next, when a test of unknown sensitivity is performed using the tester having the abovementioned configuration, a transmitter or a receiver of the transmitter-receiver 9a of the acoustic
probe 9 by the comparative calibration method described below Measure the unknown
sensitivity as.
[0031]
When performing measurement, first, attach the reference transmitter 10a obtained by mutual
calibration to the top of the deck of the measuring vessel 8 and stick it from the side of the
crucible, and project from the crucible side. To a distance d (for example, 5 m, converted to 1 m
in sensitivity calculation by the personal computer 6) and suspended in the sea.
In this state, when the tester is turned on, the synthesizer 1 sends a pulse signal of a desired
frequency to the power amplifier 2 and sends a synchronization signal to the digital storage
waveform display 5. The power amplifier 2 performs required power amplification on the pulse
signal from the sensor sizer 1 and sends it out to the reference transmitter 10 a suspended from
the side of the measuring vessel 8.
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[0032]
On the other hand, the transmission sound of the required level by the reference transmitter 10a
is received by the transducer 9a of the acoustic probe 9 disposed at a distance d between the
units. The received wave signal is sent to the preamplifier 3 and subjected to impedance
conversion and voltage amplification, and then sent to the digital storage type waveform display
5 through the high-pass filter 4.
[0033]
In the digital storage type waveform display 5, the voltage applied to the reference transmitter
10a is measured, and the transmission time d / c of the direct wave and the amplitude VP are
measured, and these data are stored in the personal computer 6 Send to In the personal
computer 6, the data from the digital storage type waveform display 5 is inserted into the floppy
disk, and the unknown sensitivity of the acoustic probe 9 as a wave receiver of the transducer 9a
is calculated based on the equation (2). Print out the calculation results etc. as needed.
[0034]
Next, when measuring the unknown sensitivity of the acoustic probe 9 as a transmitter of the
transducer 9a, instead of the reference transmitter 10a, the reference receiver 10b is taken from
the deck of the measurement ship 8. Attach to the end of the hook and so on, and hang from the
hook side in the sea separated from the transducer 9a of the acoustic probe 9 by a distance d.
Also, the transducer 9a of the acoustic probe 9 is connected to the power amplifier 2, and the
reference receiver 10b is connected to the preamplifier 3 to change the connection. In this state,
the tester is turned on to cause the synthesizer 1 to output a transmission signal, and the same
test as described above is performed. In the personal computer 6, program calculation of the
unknown sensitivity of the transmitter / receiver 9a is performed based on the formula of the
transmission sensitivity of the formula (3).
[0035]
Therefore, in the embodiment described above, the digital storage type waveform display 5
capable of instantaneously recording the acoustic waveform due to the fluctuation of the inter-
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device distance d and displaying the acoustic waveform recorded at an arbitrary time as a still
screen Therefore, the arrival time of the sound wave and the amplitude of the direct wave can be
easily and accurately measured from the displayed acoustic waveform, and the measurement
result is sent to the personal computer 6 for program calculation to obtain the acoustic search
device 9. It is possible to automatically obtain the unknown transmission sensitivity and the
reception sensitivity of the transmitter-receiver 9a in the short period of time. For this reason, a
variable resistance attenuator using a conventional switch as the inter-device distance d changes
between the transducer 9a of the acoustic probe and the reference transmitter 10a (or the
reference receiver 10b). It is possible to simplify the configuration of the measuring instrument
without having to repeatedly read the complicated waveform amplitude of the oscilloscope by
the manual operation of the unit, and it has been impossible in the past to easily measure even
when the sea pattern is mild. Measurement became possible.
[0036]
Moreover, in the prior art, since the measurement is repeated to obtain the average value of the
waveform amplitude, the measurement takes a long time and the measurement error is large.
Since the waveform amplitude and the waveform amplitude can be accurately determined, the
same high quality data as the water tank test in obtaining the standard can be obtained.
[0037]
Also, as shown in FIG. 2, simple test instruments can be easily set up and configured simply by
bringing each single unit of equipment into the field and simply stacking them.
[0038]
As described above, according to the sensitivity tester for underwater transducers according to
the present invention, reading of complicated fluctuation amplitude by manual operation of a
variable resistance attenuator using a conventional switch. It is possible to simplify the
configuration of the measuring instrument without having to perform work, and to test the
unknown sensitivity of the transducer with better measurement accuracy.
[0039]
Brief description of the drawings
[0040]
Fig. 1 Measurement system diagram showing one embodiment of sensitivity tester for
underwater transducer according to the present invention
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[0041]
Fig. 2 A diagram showing the setup of the sensitivity tester for the underwater transmitterreceiver
[0042]
Fig. 3 Waveform chart of transmit signal and receive signal displayed on the digital storage
waveform display in the sensitivity tester for underwater transmitter and receiver
[0043]
Fig. 4 Conventional sensitivity measurement system in water tank facility
[0044]
Explanation of sign
[0045]
DESCRIPTION OF SYMBOLS 1 ... Synthesizer (transmitter), 5 ... Digital storage type waveform
display (display measurement means), 6 ... Personal computer (calculation means), 9 ... Sound
search apparatus, 9a ... Transmitter / receiver, 10a ... Reference transmitter, 10b: Reference
receiver.
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