JPH0755937A - Ultrasonic number-of-fish discriminating device - Google Patents

Abstract

PURPOSE:To provide an ultrasonic number-of-fish discriminating device which discriminates the size of fishes passing through a fish ladder by using repeated pulses. CONSTITUTION:Numerous small-diameter ultrasonic vibrators 3 are arranged on the bottom of a fish ladder 2 provided in a river so that fishes 1 can pass through the ladder 2 and high-frequency pulse signals are repeatedly inputted to the vibrators 3 from a transmission circuit. A receiver 5 composed of an amplifier and time gate circuit is connected to each vibrator 3 and reflected signals are inputted to the time gate circuits only when the vibrators 3 transmit ultrasonic waves and input reflected signals from the surface of the water so that the vibrators 3 can receive reflected signals from the fishes 1 and signals from the gate circuits of the reception circuits 5 are fetched to a size discriminating circuit 6 composed of a CPU, In the circuit 6, received reflected signals of ultrasonic waves while one fish 1 passes over one vibrator are displayed as one square of a display device 7 and signals detected by means of two or more vibrators 3 are displayed as the square corresponding to the detected signals or the divide 7. Therefore, the size of fishes can be discriminated from the number of squares.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic fish number discriminating apparatus which discriminates the size of a fish shape going up a fish path by ultrasonic waves of repetitive pulses.

[0002]

2. Description of the Related Art Generally, in order to count the number of fish running up a river, guide the fish to the fishway and visually count the fish running up the fishway, or count the fish caught by a net or the like. is doing.

[0003]

However, in such visual counting, the error increases as the number of fish going up increases, and there are individual differences depending on the degree of skill of the observer, or near the fishway. It has the drawback that it causes an evasion reaction to the fish to be observed by the observer and the accurate counting cannot be done, and the counting by catching tends to damage the fish body. There is a problem that measurement is difficult when is cloudy.

A device for photographing a fish passing through a fishway with a surveillance system using a video camera and recognizing and counting the fish using an image processing system from its image signal is also conceivable, but such a device is still under development. It has not been.

[0005]

According to the present invention, a large number of small-diameter ultrasonic transducers are arranged side by side inside a fishway installed in a river, and a pulse having a high repetitive pulse frequency is applied to each ultrasonic transducer. A transmitting circuit that outputs a signal, an amplifier that amplifies the 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 receiving circuit is input to a magnitude discriminating circuit, and the signal discriminated by the magnitude discriminating circuit is displayed on a display device.

[0006]

In the present invention, a large number of small-diameter ultrasonic transducers are installed side by side at the bottom of a fishway installed in a river, and a repetition frequency from the ultrasonic transducer is applied to a fish passing near the ultrasonic transducer of the fishway. When a high pulsed ultrasonic wave is emitted, one fish
When it is detected by passing near the two ultrasonic transducers,
The small fish is displayed as one square on the display device and judged as one small fish.

Further, when a plurality of ultrasonic transducers are detected at the same time, a large fish is judged as one fish by displaying it in a square corresponding to the number of the detected ultrasonic transducers. In addition, the size of the fish shape can be determined by determining the two fish shapes from those displayed separately in the same row.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of an ultrasonic fish number discriminating apparatus according to one embodiment of the present invention, in which a fishway 2 provided so that a fish 1 passes through.
A large number of small-diameter ultrasonic transducers 3 are arranged in parallel at the bottom of each of the ultrasonic transducers 3 and are connected so that a pulse signal having a high repetition frequency is input to each of the ultrasonic transducers 3 from the transmission circuit 4.

Further, the ultrasonic transducer 3 is connected to an amplifier for amplifying a reflected signal and a receiving circuit 5 including a time gate circuit, and the reflected signal from the fish received by the ultrasonic transducer 3 is amplified by the amplifier. The reflected signal amplified only during the emission from the ultrasonic transducer 3 and the input of the reflected signal from the water surface is input to the time gate circuit, and the signal from the receiving circuit 5 is taken in by the size discriminating circuit 6 including a CPU. .

In the size discriminating circuit 6, the ultrasonic wave is reflected while the fish 1 passes over one ultrasonic transducer 3 and the received signal is displayed on the display screen 7a of the display device 7 of FIG. As shown by lines, B, and C, one cell is displayed, and at the same time, signals detected by two or more ultrasonic transducers 3 are displayed on the corresponding cells of the display screen 7a.

Then, as shown in the line D of the display screen 7a of FIG.
It is determined that the fish shape is a large fish, and if the fish are separated and displayed as indicated by the line F on the display screen 7a, the fish shape is determined to be two fish shapes.

As described above, according to the present invention, the shape of the fish passing over the small-diameter ultrasonic transducer 3 can be discriminated by the number of recording grids displayed on the display screen 7a.

In the above embodiment, a large number of ultrasonic transducers 3 having a small diameter are installed at the bottom of the fishway 2.
May be attached detachably or may be attached to a side surface or an upper surface of the fishway.

As described above, in the ultrasonic fish number discriminating apparatus of the present invention, the ultrasonic transducers are selected depending on how many ultrasonic transducers the fish passing near the small-diameter ultrasonic transducers are detected. Correspondingly, by displaying the squares on the display screen of the display device, there is an advantage that the size of the fish shape can be determined from the number of the displayed squares.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an ultrasonic fish number determination device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a display screen of the display device of FIG.

[Explanation of symbols]

 1 Fish 2 Fishway 3 Ultrasonic Transducer 4 Transmitter 5 Receiver 6 Large / Small Discrimination Circuit 7 Display Device

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Nagao Tamesawa 5-3-3 Akasaka, Minato-ku, Tokyo Water resources development public corporation (72) Minoru Hara 5-3-3 Akasaka, Minato-ku, Tokyo Water resources Within the development corporation (72) Inventor Shigeo Yamamoto 20 Oyamazuka, Oiwa-cho, Toyohashi-shi, Aichi Honda Electronics Co., Ltd. (72) Inventor Shigefumi Goto 20 Oyamazuka, Oiwa-cho, Toyohashi-shi, Aichi Honda Electronics Co., Ltd. In the company

Claims (1)

[Claims] 1. A transmission circuit for arranging a large number of small-diameter ultrasonic transducers in parallel inside a fishway installed in a river, and outputting a pulse signal having a high pulse frequency to each of the ultrasonic transducers. An amplifier for amplifying the reflected wave detected by the ultrasonic vibrator and a receiver circuit comprising an ultrasonic signal emitted from the ultrasonic vibrator and a time gate circuit for cutting the reflected wave reflected on the water surface of the fishway are connected to the amplifier. Then, the ultrasonic fish number discriminating apparatus is characterized in that the output pulse signal of the receiving circuit is inputted to the magnitude discriminating circuit and the signal discriminated by the magnitude discriminating circuit is displayed on the display device.