JPS5916230B2 - Distance counting and display device for detected objects in underwater detection equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an underwater detection device that transmits ultrasonic pulses underwater and receives reflected waves from underwater detection objects.
The present invention relates to a device that counts and displays the distance to an arbitrary detected object.

When counting the distance to the detected object, if the counted value exceeds the counting capacity of the counting circuit, it is conceivable to change the period of the clock pulse leading to the counting circuit as appropriate.

In this case, if the period of the clock pulse is automatically switched, the counting operation can be carried out smoothly.

That is, when the counting capacity is exceeded, the effective digits of the counted value can be automatically switched and counted.

However, in underwater detection devices, the period of the detection pulse is relatively long, for example, when detecting 1,500 m,
The period of the ultrasonic pulse is 2 seconds.

Therefore, when the object for distance measurement is changed, a completely different numerical value will be displayed until the next counting is performed.

For example, if the object for distance measurement is changed from an object at a position of 50.3 m to an object at a position of 135.6 m,
Conventionally, the count value changes from 50.3 to 35.6, this display value of 35.6 is held for 2 seconds, and the display value changes to 13 at the end of the next count.
A count value of 5 is displayed.

Therefore, a completely different distance value is displayed for two seconds until the next counting ends.

This invention relates to a counting device that counts the distance to a detection object detected by an underwater detection device, and after performing distance counting,
When the interval until the next count is relatively long,
If the previous count value exceeds the count capacity, the false display of the dark count value until the next count is prevented.

A further object of the present invention is to switch the period of the clock pulse during the next counting to perform counting within the counting capacity.

Examples of the present invention will be described below.

In FIG. 1, IAl IBj 10 indicates a numeric display, and the displays IA, IB, and 1c constitute a three-digit display.

2 indicates a decimal point indicator.

Displays IA, IB, 1c are latch circuits 3A.

The stored numerical values of 3B and 30 are displayed respectively.

Latch circuits 3A, 3B, 30 are counting circuits 4A, 4
Store each count value of B t40.

Counting circuits 4A and 4B. Each of the circuits 4C is composed of a decimal counting circuit, and the counting circuit 4C counts the carry pulses of the counting circuit 4B, and the counting circuit 4B counts the carry pulses of the counting circuit 4A.

Then, the counting circuit 4A counts the clock pulses sent from the clock pulse source 5 as described later.

The counting circuits 4A, 4B, and 40 count the short paths to the reflected waves returning to the ultrasonic transducer 6.

The ultrasonic transducer 6 periodically transmits ultrasonic pulses in response to excitation pulses (FIG. 2a) sent out from the transmitter 7.

The reflected wave from the detected object is guided to the receiver 8, where it is amplified and detected.

FIG. 2 shows the detection output of the receiver 8.

The detected signal from the receiver 8 is sent to the display 9 and displayed.

The display 9 is, for example, a cathode ray tube display, and deflects the electron beam using the sweep wave sent out from the sweep wave generation circuit 10, and at the same time modulates the brightness or amplitude of the electron beam using a detection signal.

Note that the sweep wave generation circuit 10 generates a sweep wave at the same time as the excitation pulse is sent from the transmitter 7.

Further, the excitation pulse a is also sent to the marker pulse generation circuit 11, and the TM time zone marker pulse (FIG. 2C) is sent out from the excitation pulse a.

The time TM from the excitation pulse a to the marker pulse C can be set arbitrarily.

The generated marker pulse C is sent to the display 9,
Displayed superimposed on the detected signal.

The marker pulse C is also sent to the gate wave generator 12, which generates a gate wave (FIG. 2d) that lasts for the TMM from the excitation pulse a to the marker pulse C.

The above counting circuit 4A. 4B and 40 count the duration TM of this gate wave d.

Therefore, by adjusting the sending time TM of the marker pulse C to match the desired reflected wave, the distance to the detected object can be counted.

This will be explained below. The gate wave of the gate wave generator 12 is sent to the gate circuit 13, and its duration TM
(Fig. 2e).

The clock pulse that has passed through the gate circuit 13 is further
It passes through the gate circuit 14 and is sent out.

This gate circuit 14 is normally conductive, and is cut off when the count value exceeds the count capacity, as will be described later.

The clock pulse that has passed through the gate circuit 14 is sent directly to the gate circuit 15 and at the same time is divided into 1/2 by the frequency dividing circuit 16.
After being frequency-divided by 10, it is also sent to the gate circuit 17.

One of the gate circuits 15 and 17 is made conductive by the output of the D flip-flop 18.

A clock pulse sent out from either gate circuit 15 or 17 passes through OR circuit 24 and is sent out to counting circuit 4A.

Therefore, when clock pulses are sent from the gate circuit 15, the counting circuit 4A directly counts the clock pulses of the clock pulse source 5.

Further, when a clock pulse is sent from the gate circuit 17, the counting circuit 4A counts a pulse train obtained by dividing the clock pulse from the clock pulse source 5 by 1/10.

The conduction between the gate circuits 15 and 17 is established by the D flip-flop 18.
When the D input of the D flip-flop 18 is at a high level, the Q output becomes a high level and the gate circuit 15 becomes conductive.

Furthermore, when the D input is inverted to low level, the Q output becomes high level and the gate circuit 17 becomes conductive.

The inversion of the D flip-flop 18 is performed when the excitation pulse a is sent out, that is, immediately before the start of counting.

Further, the D input of the D flip-flop 18 is determined by the Q output of the D flip-flop 19.

The D flip-flop 19 is a counting circuit 4A.

When the count values of 4B and 4c are within the count capacity, the Q output sends out a high level output.

When the count value exceeds the counting capacity, the Q output is inverted to a low level, the gate circuit 1T becomes conductive, and a clock pulse divided into 1/10 is supplied to the counting circuit 4A.

The Q output of the D flip-flop 19 is inverted to a low level when the count value exceeds the counting capacity and a carry pulse is sent from the counting circuit 4C.

This inverted output is also sent to the terminal T of the flip-flop 20, inverting the Q output to a low level.

Then, the gate circuit 14 is cut off.

Therefore, no clock pulse is sent to the counting circuit 4A, and the counting circuits 4A, 4B, and 40 are held at the maximum count value.

This maximum count value is when the marker pulse C is sent out.
It is stored in the latch circuits 3A, 3B, and 30, and displayed until the next marker pulse C is sent out.

Then, when the excitation pulse a is sent out next time, the flip-flop 20 is reset and the gate circuit 14 becomes conductive.

Furthermore, the Q output of the D flip-flop 18 is inverted to a high level, and the clock pulse whose frequency has been divided to 1/10 is supplied from the gate circuit 17 to the counting circuit 4A.

In the above, when the clock pulse period of the clock pulse source 5 is set to 133 μSec, the gate circuit 17 sends out a clock pulse with a period of 1.33 m5ec to the counting circuit 4A.

Since the ultrasonic signal travels a distance of 1.33 m5ecJc 1 m, in the above case, the counting circuits 4A, 4B, 40 count distances less than 1000 m.

As described above, while counting the distance to the position corresponding to marker pulse 0, the distance to the position corresponding to marker pulse C is counted by 1.
When it is less than 00 m, the gate circuit 15 switches and becomes conductive, and the clock pulse with a period of 133 μSeC is transmitted to the counting circuit 4.
Sent to A.

This operation is performed based on the fact that the carry pulse is no longer sent to the counting circuit 4C.

That is, when the counting distance is 100 m or more, the Q output of the D flip-flop 21 is inverted to a high level by the carry pulse of the counting circuit 4B (FIG. 2f).

(FIG. 2g) Note that the D flip-flop 21 is reset in advance by the excitation pulse a.

The Q output of the D flip-flop 21 is sent to the NOR circuit 22 together with the gate wave d.

NOR circuit 22 sends out a high level output only when both inputs are at low level.

The output of the NOR circuit 22 is sent to the set terminal of the D flip-flop 19, and when the set input of the D flip-flop 19 changes from low level to high level, the Q output is inverted to high level.

Therefore, as described above, when a carry pulse is sent from the counting circuit 4B, both inputs of the NOR circuit 22 will not become low level at the same time, so the D flip-flop 1
9 is not set.

As a result, as mentioned above, the counting capacity of the counting circuit 4 is exceeded.
After the carry pulse is sent from C, the Q output of D flip-flop 19 is held at a low level.

With this low level output, the D flip-flop 18 supplies the clock pulse frequency-divided by 1/10 from the gate circuit 1T to the counting circuit 4A.

When the counting distance becomes less than 100 m, the counting circuit 4B does not send out the carry pulse f.

Therefore, after the D flip-flop 21 is reset by the excitation pulse a, the Q output is held at a low level as shown in FIG. 2g.

As a result, the NOR circuit 22 has both inputs at a low level after the fall of the gate pulse d, so the output is inverted to a high level as shown in the second diagram, and this sets the D flip knob 19. do.

The Q output of the D flip-flop 19 is inverted to a high level (FIG. 2i).

Then, the D flip-flop 18 receives the next excitation pulse a.
When the Q output is sent out, the Q output is inverted to a high level (FIG. 2j), which makes the gate circuit 15 conductive and the 133
A clock pulse with a μSeC period is sent to the counting circuit 4A.

The ultrasonic signal travels back and forth over a distance of 0.1 m in 133 μsec.

Therefore, in this case, the counting circuits 4A, 4B. The count result of 4C is displayed as a distance in three digits to the first decimal place on the display devices IA)IB and 10.

The decimal point display at this time is performed by the indicator light 2 emitting light.

The indicator light 2 is turned on when the switching circuit 25 is conductive.
Connected to a light emitting power source.

The switching circuit 25 has a Q of the D flip-flop 23.
Conducts when the output inverts to high level.

Then, in the D flip-flop 23, the Q output of the D flip-flop 18 is inverted to a high level, and after the marker pulse C is applied to the terminal T, the Q output is inverted to a high level.

As explained above, according to the present invention, the period of the counting pulse is automatically switched according to the detection distance,
In addition, if the counting capacity is overflowed, the maximum counted value is displayed until the next counting.

Therefore, it is possible to obtain a device that is suitable for use in devices where the counting interval is relatively long, such as underwater detection devices.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, and FIG. 2 shows a waveform diagram for explaining its operation.

Claims (1)

[Claims] 1. Underwater detection that transmits ultrasonic pulses underwater at intervals of several seconds, receives reflected waves from a detected object, and counts and displays the distance to any detected object from among the reflected waves. In the apparatus, a first clock pulse train generation circuit, a second clock pulse train generation circuit having a cycle ten times that of the first clock pulse train, and one of the first and second clock pulse trains. a switching gate circuit that switches and sends out a clock pulse train; and a clock pulse train that counts the clock pulse train sent out from the switching gate circuit from the time of transmitting the ultrasonic pulse to the time of receiving the reflected wave from the detected object. A counting circuit with a leading n digit, and a carry pulse outputted from the maximum digit counting circuit when the count value of the counting circuit exceeds the counting capacity, and a carry pulse outputted from the counting circuit until the next ultrasonic pulse is sent, the above-mentioned tubes 1 and 1 are operated. a gate circuit that stops sending out the second clock pulse, and a gate circuit that causes the switching gate circuit to send out the second clock pulse train when transmitting the next ultrasonic pulse based on the carry pulse output from the maximum digit counting circuit. , further, a switching gate drive circuit that performs a switching operation such that when the carry pulse guided to the maximum digit counting circuit disappears, the switching gate circuit transmits the first clock pulse train at the time of transmitting the next ultrasonic pulse. A distance counting display device for a detected object in an underwater detection device, comprising: