JPS601433Y2 - underwater detection device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an underwater detection device that efficiently detects and displays a wide range of underwater directions.

This device detects underwater by forming a planar triangular or fan-shaped receiving beam, and displays the underwater situation detected on the display surface of the display unit in a fan shape in relation to the detection range and direction. Further, by rotating the planarly formed reception beam in the horizontal direction and rotating the fan-shaped display in relation to this rotation, an underwater display capable of detecting a wide range of underwater directions and providing an easy-to-observe display is provided. Regarding detection devices.

Embodiments of this invention will be described below with reference to the drawings.

Fig. 1 shows an underwater detection device in which this invention is implemented, Fig. 2 shows a transducer used in this invention, Fig. 3 shows an embodiment of this invention, and Fig. 4 shows an embodiment. FIG. 5 shows a main waveform diagram for explaining the present invention.

In FIG. 1, T1 to fin are a group of transducers arranged in an arc shape larger than a semicircle that constitutes the transducer 1, and periodically transmit ultrasonic pulses in a wide range of directions based on the pulse generator 2. do.

The reflected waves from each direction are received by each transducer T1 to Tn, and each received signal is synthesized as follows and sent to each preamplifier PA, PA2...PAK. amplified.

For example, preamplifier PA□ includes transducer T1. T2 and i
By combining the three received signals, a beam signal having a sharp directivity in the θ1 direction is amplified.

Similarly, preamplifier PA2 has transducers T3. T, and T,
Each preamplifier amplifies the beam signal in the respective directional direction by combining the received signals of 1 and 2 and amplifying the beam signal having the directional characteristic in the 02 direction.

The output of each preamplifier is sequentially switched and taken out by a switch SW, and then applied to a brightness terminal of a cathode ray tube CRT via a main amplifier MA.

On the other hand, the output of the pulse generator 2 is also applied to the polarized wave generation circuit 3, and a polarized wave is generated based on it.

The generated polarized wave is applied to the deflection coil 4 of the cathode ray tube CRT, causing the electron flow to sweep concentrically as shown in FIG. 4A.

However, when the waist deflection wave sweeps the area other than the shaded area, that is, the lower half of the cathode ray tube surface, a signal is applied to the brightness adjustment terminal to prevent the electron flow from reaching the cathode ray tube surface.

Therefore, the deflection wave applied to the deflection coil 4 causes the electron flow to sweep in a semicircle as shown by the hatched area in FIG. 4A, corresponding to the arrangement of the transducers T1 to Tn.

This sweeping operation and the switching operation of the switching device SW are performed in synchronization, and the switching device SW is designed to perform one switching operation within a period in which the electron flow is used once.

As shown in FIG. 2, the transducer 1 is composed of transducers T1 to Tn arranged and held in an arc shape larger than a semicircle, and the transducer 1 is symmetrically arranged. It is held on the bottom of the ship (not shown) by a rotation shaft 7 so that the center part faces directly below and can be rotated by 180 degrees horizontally in the left-right direction.

The rotating shaft is connected via gears 8 and 9 to a knob 10 provided on the operation panel of the underwater detection device.

In FIG. 3, the output terminal of reference pulse generator 12 is connected to the input terminal of frequency divider 13. In FIG.

A frequency divider 13 divides the frequency of the input reference pulse signal and outputs a pulse signal of the same period to a gate circuit 14 and a subtraction counter 15.
Send to.

The gate circuit 14 opens the gate when receiving a signal from the pulse generator 2, that is, when the transducer 1 emits an ultrasonic pulse signal in a wide range of directions, and converts the output signal of the frequency divider 13 into a sine wave generating circuit 16 and counting. When the signal is received from the counter 17, the gate is closed and the pulse train sent from the frequency divider 13 is stopped from passing.

The sine wave generating circuit 16 generates a sine wave of one period based on the input pulse train, for example, a 360 sl pulse, and sends it to the deflection coil 4 of the cathode ray tube CRT.

Similarly, the cosine wave generation circuit 18 generates a cosine wave of one period based on, for example, 36 waves of input power and sends it to the deflection coil 4.

The counter 17 includes sine wave and cosine wave generation circuits 16 and 18
A pulse signal is generated in synchronization with a sine wave and a cosine wave respectively generated. For example, when 36 input pulses are counted, the pulse signal is sent to the sine wave and cosine wave generating circuits 16 and 18.

Furthermore, when the counter 17 counts the same number of concentric sweep lines drawn on the CRT surface of the cathode ray tube, it sends an output pulse to the gate circuits 14 and 31 to close them.

The sine wave and cosine wave generation circuits 16 and 18 include a counter 17
The deflection coil 4 sends out to the deflection coil 4 sine waves and cosine waves whose amplitudes increase sequentially each time the deflection coil 4 receives a signal sent out every time it counts 360 input cavities.

Therefore, the CRT surface of the cathode ray tube is swept by a concentric electron stream whose radius increases successively.

On the other hand, the output of the frequency divider 13 is sent to the subtraction counter 15.

The other input terminal of the subtraction counter 15 is connected to the output terminal of an analog-to-digital converter 19 (hereinafter referred to as an AD converter).

An input terminal of the A-D converter 19 is connected to a movable piece 21 of a potentiometer 20.

The movable piece 21 is connected to a rotating shaft that holds and rotates the transducer 1 and moves in synchronization with the rotation of the transducer 1.

One end of the potentiometer 20 is connected to a DC power supply VD, and the other end is grounded.

A voltage signal corresponding to the rotation angle of the transducer 1 is input from the potentiometer 20 to the A-D converter 19, and the input signal is converted into a digital value and sent to the subtraction counter 1.
5.

The pulse generator 22 sweeps each sweep line S□, S2, . A pulse is generated at the start of the process and sent to the subtraction counter 15.

The subtraction counter 15 reads a digital value corresponding to the rotation angle of the transducer 1 sent from the A-D converter 19 when receiving the pulse signal from the pulse generator 22, and divides this read value. Each time a pulse signal is received from the circuit 13, the pulse signal is subtracted, and when the subtraction result becomes zero, the pulse signal is sent to the FF circuit 23 and the gate circuit 31.

The gate circuit 31 opens the gate when receiving a pulse signal from the subtraction counter 15 to allow the pulse train sent from the frequency divider 13 to pass to the counter 32, and opens the gate when receiving a pulse signal from the counter 17. close

The counter 32 sends out a pulse signal to the FF circuit 23 every time it counts 180 pulses out of the pulse train sent out from the gate circuit 31, and is reset to return to its original state and starts counting again.

The F-F circuit 23 generates a zero level voltage signal when receiving the pulse signal from the subtraction counter 15, and sends it to the level converter 24 which generates a positive voltage signal when receiving the pulse signal from the counter 32. do.

The level converter 24 sends a zero level voltage signal to the electron flow control terminal of the cathode ray tube CRT when receiving a zero level voltage signal to cause the electron flow to reach the cathode ray tube surface, and when receiving a positive voltage signal, it sends a zero level voltage signal to the electron flow control terminal of the cathode ray tube CRT. voltage signal (e.g. -100
CV)) is sent to the same terminal and controlled so that the electron flow does not reach the cathode ray tube surface.

FIG. 6 is a diagram showing the relationship between the ship 26 equipped with the transducer 1 and the transducer.

Components with the same reference numerals in FIGS. 1 to 6 above perform the same functions.

The operation of the embodiment will be explained below.

As shown in FIG. 6, first, the transducer 1 is placed in a direction perpendicular to the direction of movement of the ship 26, that is, each vibrator constituting the transducer is parallel to the direction of movement of the ship, and in the center of the transducer. We will explain the case where the object is held facing straight down.

In this case, the movable piece 21 of the potentiometer 20 is held at its midpoint.

To simplify the explanation, the DC power supply VD is 3.6 (V:]
Therefore, the DC voltage 1 input to the A-D converter 19 is
．． 8(V).

Further, it is assumed that the output value of the A-D converter 19 at this time is 180.

The pulse generator 22 has a sweep line St and a straight line X (FIG. 4).
Since a pulse signal is generated when starting the sweep from above -0, the subtraction counter 15 outputs the output value 180 of the A-D converter 19.
Load.

At this time, a pulse signal is simultaneously sent from the pulse generator 2 to the transducer 1 and the gate circuit 14, and an ultrasonic pulse signal is emitted from the transducer 1 in a wide range of directions.
opens the gate to allow the pulse train output of frequency divider 13 to pass.

The sine wave and cosine wave generation circuits 16 and 18 are shown in FIG.
As shown in FIG. 4B, a sine wave and a cosine wave with an amplitude V1 of one cycle from time t1 to t1 are generated based on the 36 solidified input pulses and are applied to the deflection coil 4, so that the CRT surface of the cathode ray tube is displayed as shown in FIG. A circular sweep line similar to the S construction in A is drawn.

On the other hand, when the gate circuit 14 is opened, the FF circuit 23
Assuming that is sending a positive voltage signal to the level converter 24, the level converter also applies a negative voltage signal to the electron flow control terminal, so while this negative voltage signal is applied, the electron flow The current does not reach the surface of the cathode ray tube.

Therefore, even if some signal is applied to the luminance terminal during this period, it will not be displayed on the cathode ray tube CRY.

The output value 180 of the A-D converter 19 is read into the subtraction counter by the pulse signal P1 shown in FIG. 5 sent from the pulse generator 22 when the ultrasonic pulse signal is emitted from the transducer 1. The above value 180 is subtracted every time a pulse signal is received from the frequency divider 13 from time t1, and when the 18th pulse signal is received, the pulse P2 is
Since the signal is sent to the -F circuit 23 and inverted, the level converter 24 applies a zero level voltage signal to the electron flow control terminal.

Therefore, the emitted electron current is kept in a state where it can reach the cathode ray tube surface, and is displayed on the cathode ray tube surface when a signal is sent from the main amplifier MA to the brightness terminal.

The subtraction counter 15 simultaneously sends the pulse signal to the gate circuit 31.
When the sweep line S1 reaches the straight line X-0 at time t2, the counter 32 sends the pulse signal to F.
- Send to the F circuit 23, reverse the F-F circuit 23, and use the electron flow control terminal of the cathode ray tube.

A negative voltage signal is applied to keep the electron flow from reaching the cathode ray tube surface.

Further, the pulse generator 22 sends a pulse signal to the subtraction counter 15 when the sweep line S1 reaches the straight line X-O, and causes the output value 180 of the AD converter 19 to be read.

Since the deflection coil 4 is supplied with a sine wave and a cosine wave having an amplitude of V2 from the sine wave and cosine wave generating circuits 16 and 18, respectively, a sweep line S2 is drawn on the surface of the cathode ray tube.

However, until the subtraction counter 15 receives the pulse signal of 18 from the frequency dividing circuit 13, that is, the sweep line S2 changes to the straight line
Since the electron flow is prevented from reaching the cathode ray tube surface until it reaches O, no bright spot appears on the lower half of the screen.

When the sweep line S2 reaches the straight line X-O, the subtraction counter 15 sends an output signal to the F-F circuit 23, inverts it, and applies a zero level voltage signal to the electron flow control terminal of the cathode ray tube. Until it reaches the straight line X-O, that is, counter 3
2 counts input pulses of 18()flN, the electron flow is kept in a state where it can reach the cathode ray tube surface, and then the sweep lines S3. S4...S
n is drawn.

As is clear from the above description, the reflected signal captured by the transducer 1 is displayed in the shaded area on the straight line XX'.

When the sweep line Sn has been drawn, the counter 17 sends a pulse signal to the gate circuit 14 to close the gate and prepare for the next sweep operation.

Contrary to the above assumption, even if the F-F circuit 23 is sending out a zero level voltage signal when the first sweep line S1 sweeps the lower half of the cathode ray tube surface, the second sweep line S1
After that, it works normally, so there is no problem in practice.

Next, when an ultrasonic pulse signal is emitted from the transducer 1, the gate circuit 14 is opened by the pulse signal sent from the pulse generator 2, and the same sweeping operation as above is performed, but the explanation thereof is omitted. do.

As long as the transducer 1 is held in a direction perpendicular to the direction of movement of the ship 26, a sweep as shown in FIG. 4A is performed.

When the transducer 1 is rotated and held by ff/4 clockwise using the knob 10 as shown by the broken line 28 in FIG. 6, the display surface of the cathode ray tube CRT used for display is as shown in FIG. This is the shaded part of B.

The movable piece 21 of the potentiometer 20 moves upward as the transducer 1 rotates, and a DC voltage of 2.25 (V) is applied to the input end of the A-D converter 19. The output value 225 of the A-D converter 19 is written by the pulse signal sent from the pulse generator 22 when each sweep line starts sweeping on the straight line X--O.

When the subtraction counter 15 receives the 22nd pulse signal from the frequency divider 13, that is, each sweep line becomes the straight line Y in FIG. 4B.
When reaching 'iO, the subtraction counter 15 sends a pulse signal P3 (FIG. 5d) to the F-F circuit 23, which inverts it and allows the electron flow to reach the surface of the cathode ray tube.

When each sweep line reaches the straight line X-O, the pulse generator 22 sends a pulse signal to the subtraction counter 15 to start the next sweep.

However, these sweeping lines do not appear on the screen.

Each sweep line that has reached the above straight line X-O continues to sweep to the straight line Y1-0.

When each sweep line reaches the straight line Yh O, the counter 32 finishes counting the value 180 and sends a pulse signal to the F-F circuit 23, which is inverted and controlled so that the electron flow does not reach the cathode ray tube surface.

In this case, each concentric sweep line is a straight line X-O
Their radii are then increased to the radius of the next drawn sweep line.

Next, the transducer 1 is rotated using the knob 10 and the sixth
When the numbers are held at 100 million as shown by the broken line 29 in the figure, the cathode ray tube section used for display becomes the shaded area in FIG. 4C.

Furthermore, when the transducer 1 is rotated by π/4 and held at the position indicated by the broken line 30 in FIG. 6, the reflected signal captured will be displayed in the shaded area in the fourth diagram.

The pulse signals P4 and P shown in FIG. 5 e and f are sent by the counter 32 to the F/F circuit 23 when the transducer 1 is held as shown by broken lines 29 and 30 in FIG. 6, respectively. Shows a pulse signal.

The operation of the embodiment in these cases is the same as the above description, so a description thereof will be omitted.

In the above embodiment, the transducer is rotated by π/4, but it is also possible to rotate the transducer continuously.

Further, although the transducer was manually rotated using the knob 10, it is also possible to automatically rotate the transducer using a motor in synchronization with the rotation of the display surface of the cathode ray tube.

In addition, each transducer T1 to TI of the transducer 1 is 1
Although a plurality of transducers were used in this embodiment, it is also possible to use a plurality of transducers arranged in tandem for each T.

As mentioned above, according to this invention, by rotating the transducer consisting of a group of transducers arranged in an arc shape, it is possible to easily observe the underwater situation in all directions. Since the display section on the cathode ray tube surface also moves in synchronization with the direction, the search direction can be easily made clear, making it possible to provide an underwater detection device that is easy to use.

[Brief explanation of the drawing]

Fig. 1 shows a block diagram of an underwater detection device in which this invention is implemented, Fig. 2 shows a transducer and a rotating device used in an embodiment of this invention, and Fig. 3 shows a block diagram of an embodiment. FIG. 4 shows the cathode ray tube surface used in the example, and FIG. 5 shows the main waveform diagram for explaining the example.
The figure shows the relationship between a ship and the transducer according to the embodiment installed on the ship.

Claims (4)

[Scope of utility model registration request] (1) a transducer constituted by a group of transducers arranged in an arc; a transmitting means for simultaneously exciting the group of transducers of the transducer and transmitting an ultrasonic pulse signal in a wide range of directions; a beam forming means for electrically repeatedly forming a plurality of receiving beams having sharp directivity characteristics and sequentially different pointing directions along an arc at high speed by combining a plurality of transducers of the transducer group; a switching means for sequentially switching reception beams; and a display screen that scans a display surface in a circular shape and displays a reflected signal from a detected object captured by the plurality of reception beams on a display in synchronization with switching of the reception beams. display means for displaying a substantially fan-shaped display on a surface; rotating means for rotating the transducer in a horizontal direction; An underwater detection device comprising display moving means that sequentially displays points in different locations in a fan shape. (2) The underwater detection device according to item 1, wherein the ultrasonic pulse signal is transmitted by the transducer in a vertical plane to form a reception beam. (3) The display means includes a cathode ray tube, a reference pulse generation circuit that generates a pulse signal at a predetermined period, and a pulse signal sent by the reference pulse generator,
a deflection signal generator that generates a deflection signal that causes the electron flow to scan the display surface of the cathode ray tube in a substantially circular manner and with its radius increasing sequentially; a set signal generator that generates a set signal when a first counter that generates an output signal; and a first counter that starts a counting operation by counting in response to a pulse signal sent from the reference pulse generator when the output signal is sent from the first count value; a second counter that generates an output signal when the count value reaches a predetermined value; and an output signal that is inverted each time the output signal of the first counter or the second counter is applied. 2. The underwater device according to claim 1, comprising: an inverter that generates electron beams; and a controller that controls the electron flow of the cathode ray tube to reach or not reach the display surface of the cathode ray tube based on the output signal of the inverter. Detection device. (4) The display moving means includes a reference pulse generator that generates a pulse signal at a predetermined period, and a set signal generator that generates a set signal when the electron flow of the cathode ray tube scans a reference line on the surface of the cathode ray tube. and a directional signal generator that generates a numerical signal related to the horizontal directivity angle of the transducer, and a numerical value that the directional signal generator sends out when the output signal of the set signal generator is applied. a first counter that sets a signal, performs a counting operation every time a pulse signal is supplied from the reference pulse generator, and generates an output signal when the counted value reaches a predetermined value; a second counter that starts a counting operation in response to the pulse signal sent from the reference pulse generator when the output signal is sent from the device, and generates an output signal when the counted value reaches a predetermined value; an inverter that generates an output signal that is inverted each time the output signal of the first counter or the second counter is applied, and an electron flow of the cathode ray tube based on the output signal of the inverter; 2. The underwater detection device according to claim 1, further comprising a controller that controls the underwater detection device to reach or not reach the display surface.