JP3229451B2 - Ultrasonic fish counting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic fish counting apparatus for counting the number of small fish passing through a fishway by ultrasonic waves of fast repetitive pulses.

[0002]

2. Description of the Related Art In general, in order to count the number of fish going up a river, fish are guided to a fishway and the fish going up the fishway are counted visually or the fish caught by a net or the like are counted. are doing.

[0003]

However, in such a visual counting, an error increases as the fish goes up in a large amount, and individual differences occur depending on the skill of the observer. The observation by the observer has the drawback that the fish can cause repellent reactions, making accurate counting impossible.Furthermore, the counting by catching has the disadvantage that the fish body is easily damaged. When it is cloudy, there is a problem that measurement is difficult.

[0004] Further, there is a conceivable device for photographing a fish passing through a fishway with a monitoring system using a video camera and recognizing and counting the fish from an image signal using an image processing system. However, such a device is still being developed. It has not been.

[0005]

According to the present invention, one or a plurality of ultrasonic transducers are juxtaposed in a fishway installed in a river, and a pulse having a high pulse frequency is repeatedly applied to each ultrasonic transducer. A transmitting circuit for outputting a signal, an amplifier for amplifying a reflected wave detected by the ultrasonic transducer, an ultrasonic signal emitted from the ultrasonic transducer to the amplifier, and a time for cutting the reflected wave reflected on the water surface of the fishway. A receiving circuit including a gate circuit is connected, an output pulse signal of the time gate circuit is input to a buffer memory connected to a control circuit, and several times of the output pulse signal of the gate circuit are stored and output once. In the ultrasonic fish counting apparatus, the output signal is displayed on the display device in synchronization with the horizontal synchronization signal and the vertical synchronization signal of the display device, and the frequency is divided using the horizontal synchronization signal as a clock. Type the road, and input to the shift register and set the clock to the plurality per one vertical synchronizing signal is sequentially oscillation trigger from the shift register that is to be sent to the transmission circuit.

[0006]

According to the present invention, one or a plurality of ultrasonic transducers are juxtaposed in a fishway installed in a river, and a small fish passing through the fishway is pulsed from the ultrasonic transducer at a high repetition frequency. When an ultrasonic wave is emitted, a plurality of ultrasonic waves are reflected by the fish while a small fish passes over the ultrasonic transducer, and a plurality of signals of the reflected waves are collected by a buffer circuit. By outputting the signal as one signal, the number of fish can be counted by counting the signal output from the buffer circuit to the fish shadow of the image displayed on the display device.

In order to emit a pulsed ultrasonic wave having a high repetition frequency from this ultrasonic transducer, a horizontal synchronizing signal from a control circuit is inputted as a clock to a frequency dividing circuit.
A vertical synchronizing signal is input from the control circuit to the frequency dividing circuit, and by setting a plurality of clock signals for one of the vertical synchronizing signals, an ultrasonic pulse signal is emitted more than the normal number of times of emission. Ensure that small fish swimming at high speed can be counted.

[0008]

FIG. 1 is a block diagram of an ultrasonic fish counting apparatus according to an embodiment of the present invention. A large number of ultrasonic vibrators 3 are provided at the bottom of a fishway 2 installed in a river so that small fish 1 can pass through. Are connected in such a manner that a pulse signal having a high repetition frequency is input from the transmission circuit 4 to each of the ultrasonic transducers 3.

An amplifier for amplifying the reflected signal and a receiving circuit 5 comprising a time gate circuit are connected to the ultrasonic vibrator 3, and the reflected signal received by the ultrasonic vibrator 3 is amplified by the amplifier, and The reflected signal amplified only during the time of emission from the child 3 and the time of input of the reflected signal from the water surface is input to the time gate circuit, and the signal from the gate circuit of the receiving circuit 5 is taken into the control circuit 6 and stored in the buffer memory 7.
Is input to

In the buffer circuit 7, the number of ultrasonic pulses to be emitted is set to be substantially equal to the number of times that the ultrasonic waves are reflected upon the small fish 1 while the small fish 1 passes near the ultrasonic vibrator 3. The number of times to temporarily memorize the relationship is set,
The signal read from the buffer memory 7 is displayed on the display device 8.

For example, since a video signal displayed on the display device 8 normally forms one image in 1/60 second, if an ultrasonic wave is emitted once and its reflected signal is displayed on the image, Since the number of ultrasonic waves emitted is only 60 / sec, a small fish swimming at high speed may be missed with this pulse signal.

Therefore, in the present embodiment, the horizontal synchronizing signal from the control circuit 6 is input to the frequency dividing circuit 9 as a clock.
Also, a vertical synchronizing signal is input from the control circuit 6 to the frequency dividing circuit 9, and a plurality of horizontal synchronizing signals as clocks are output from the frequency dividing circuit 9 in synchronization with one of the vertical synchronizing signals. The number of clocks per one vertical synchronization signal is arbitrarily set, and a plurality of transmission triggers are sequentially transmitted from the shift register 10 to the transmission circuit 4 each time one vertical synchronization signal is input. To be configured.

For example, if the number of clocks per vertical synchronization signal is set to 4, the number of oscillation triggers fired per second is 240, and the number of clocks per vertical synchronization signal is arbitrary. , The number of clocks can be set arbitrarily.

As described above, in this embodiment, by generating an oscillation trigger that is completely matched with a horizontal synchronization signal that is a plurality of clocks for one vertical synchronization signal, the number of oscillation triggers that exceeds the normal number of firings is increased. Is transmitted to the transmission circuit 4 and a large number of pulsed ultrasonic waves are emitted. By temporarily reading, sequentially reading and displaying on the display device 8, small fish can be accurately counted from the displayed image.

In the above embodiment, a number of ultrasonic vibrators 3 are installed at the bottom of one fishway 2, but the fishway 2 is divided as shown in FIG. The vibrator 3 is installed or detachably mounted, and the ultrasonic vibrator 3 includes a transmission circuit 4, a receiving circuit 5, a control circuit 6, a buffer memory 7, a display device 8, a frequency dividing circuit 9, and a shift register 10. A device 11 may be connected, or, as shown in FIG.
1 may be installed, and as shown in FIG.
And the ultrasonic transducers 3 may be installed in each fishway 2.

In the ultrasonic fish counting apparatus of the present embodiment configured as described above, the fishway 2 is divided,
As in the above-described embodiment, the number of small fish going up can be counted accurately, and the number can be counted continuously even at night or in the state of turbid water.

[0017]

As described above, in the ultrasonic fish counting apparatus according to the present invention, the horizontal synchronization signal is used as a clock to set a plurality of pieces for one vertical synchronization signal, so that the number of fishes provided in a river can be increased. The number of ultrasonic waves emitted from one or more ultrasonic transducers installed is set to be greater than the normal number of times to ensure that signals are reflected from small fish, and this reflected signal is displayed. By doing so, there is an advantage that the number of small fish passing through the fishway can be accurately counted from the displayed image.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an ultrasonic fish count measuring apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of an ultrasonic fish count measuring apparatus according to another embodiment of the present invention.

FIG. 3 is a configuration diagram of an ultrasonic fish counting apparatus according to another embodiment of the present invention.

FIG. 4 is a configuration diagram of an ultrasonic fish counting apparatus according to another embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fish 2 fishway 3 ultrasonic transducer 4 transmission circuit 5 reception circuit 6 control circuit 7 buffer memory 8 display device 9 frequency dividing circuit 10 shift register 11 counting device

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nagao Tamezawa 5-3-3 Akasaka, Minato-ku, Tokyo Water Resources Development Public Corporation (72) Inventor Toshiaki Hara 5-3-3 Akasaka, Minato-ku, Tokyo Water Resources Development Inside the public corporation (72) Inventor Shigeo Yamamoto 20 Oyamazuka Oiwa-cho, Toyohashi-shi, Aichi Prefecture Inside Honda Electronics Co., Ltd. (56) References JP-A-1-112936 (JP, A) JP-A-4-304830 (JP, A) JP-A-5-312947 (JP, A) JP-A-6-243311 (JP, A) JP-A-7-55936 (JP, A) JP-A-7-55937 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01S ⁷ /52-7/64 G01S 15/00- 15/96

Claims (1)

(57) [Claims] A transmitting circuit for arranging one or a plurality of ultrasonic transducers side by side in a fishway installed in a river, and for repeatedly outputting a pulse signal having a high pulse frequency to each ultrasonic transducer; An amplifier for amplifying the reflected wave detected by the ultrasonic vibrator and an ultrasonic signal emitted from the ultrasonic vibrator and a receiving circuit comprising a time gate circuit for cutting off the reflected wave on the water surface of the fishway are connected to the amplifier. An output pulse signal of the time gate circuit is input to a buffer memory connected to a control circuit, and several times of the output pulse signal of the gate circuit are stored and output once, and the output signal is displayed once. In the ultrasonic fish counting device which is displayed on the display device in synchronization with the horizontal synchronization signal and the vertical synchronization signal, the horizontal synchronization signal is input to a frequency dividing circuit as a clock, and the clock is input to the frequency dividing circuit. An ultrasonic fish number measuring apparatus wherein a plurality of vertical synchronization signals are set and input to a shift register, and oscillation triggers are sequentially transmitted from the shift register to the transmission circuit.