SU76186A1 - Electrical signaling installation for detecting fish running - Google Patents

Description

The subject of the invention is an electrical signaling installation for detecting a fish stroke consisting of a catching mechanical oscillations of an underwater antenna and a receiver using a piezoelectric element.

The electrical part of the antenna (Fig. 1) consists of a system of parallel-connected hydrophones 1 and a two-core electric cable 2, transmitting current pulses from hydrophones to a receiving-amplifying device 3.

The hydrophone (Fig. 2) consists of a casing 4, a vibrator 5 with a pin 6, with which it is connected to the cord 7, a float 8 (Fig. 1) and a piezoelectric element 9. The piezoelectric element is clamped between the rubber support 10 and the vibrator 5, which, in turn, is pressed against the piezoelectric element by a cover of the casing through a rubber gasket 12. The electrodes of the piezoelectric element are led out through insulating plugs in the bottom of the casing and connected to the cores of the cable 2.

Cable 2 is pressed to the bottom of the hydrophone housing by a metal plate 13, the space under which is filled with an insulating mass. The ends of the plates have clamps 14, tightly covering the cable and ensuring the mechanical strength of the hydrophone attachment to the cable.

Current pulses are fed through cable 2 to receiving and amplifying device 3, which is a conventional low-frequency amplifier. The power of the amplifier is determined depending on the power consumption of the recording devices.

The peculiarity of the proposed installation with piezoelectric elements is its reversibility, i.e., if electrical power is supplied to the cable, the piezoelectric elements will vibrate with this frequency and cause the antenna to sound. In this case, the antenna can serve as a sound obstacle to the fish. - The sound antenna can be used to hold or divert the fish in the desired direction.

As a recording apparatus after an amplifier, either acoustic devices (loudspeaker, electromagnetic headphones) or instruments with an arrow for visual observation, sound recording and recording devices (graphical

tape recording, pulse counters). Signaling by conventional means of communication is also possible.

The mechanical part of the antenna, which receives oscillations and transmits them to the piezoelectric elements, is a modification of the conventional jfoBa orifice, smooth and fixed networks. A mechanical needle coil in the antenna is excited by the KocffdaeHHeirf of the fish and the movement of water (Passing it in the area of the antenna's action.

For catching oscillations serves. 7, fixed at one end on the vibrator 5 of the hydrophone, and at the other end on the float 8 (or weight), providing sufficient tension. The distance between the individual cords and the height of the suspension is determined by the specific task of the observation.

The whole set of ropes is placed on the electric cable 2. For unloading the cable from tension, it is suspended to the steel cable 15 over the entire length. In known cases, antenna cords can be connected into groups serving one hydrophone. For this, the cords must be connected to a hydrophone by an elastic mechanical link.

Subject invention

Claims (2)

1. An electrical signaling installation for detecting the movement of fish, consisting of wires stretched under water and connected to a device for converting their mechanical vibrations (passing fish) into electrical signals, which means that piezoelectric elements. 2. The form of installation performance under item 1, characterized in that the installation allows the use of the opposite effect. S. And .2 5 5