SU959717A1 - Apparatus for counting young fishes in water flow - Google Patents

Description

DEVICE FOR COUNTING YOUNG FISH WATER FLOW

one

The invention relates to the fishing industry, in particular, to devices for counting juvenile fish in a stream, and can be used in slave breeders when counting juveniles released from adult ponds.

A device for counting juvenile fish in a stream of water, including its account, a channel, a television sensor connected to it and a counting-analyzing unit 1 connected to the latter, is known.

In the known device, due to the turbidity of the water and the insufficient level of natural illumination, a low contrast of images of objects moving with the water flow is created, due to which the amplitude of the video signal at the output of the television sensor is small, which causes malfunctions in the counting and analyzing unit and the result counting juvenile fish.

The closest to the proposed technical essence and the achieved result is a device for counting young fish in a stream of water, including a metering channel, the upper and lower walls of which are made of optically transparent material, located under the bottom wall of the illuminator, optically conjugated with channel television sensor and associated with the last counting unit 2.

In this device, the fish to be counted are moving through the accounting channel with a constantly set section height, as a result of which, when counting the young of these species of fish, whose height is slightly less than the height of the channel, in the latter, migrations occur when several objects are simultaneously under each other or partially overlap each other, which leads to the appearance of their distorted optical images perceived as video pulses by a television sensor. This reduces the accuracy of counting young fish.

The aim of the invention is to ensure the accuracy of the counting of young fish of various species of fish.

Claims (2)

To achieve this goal, in a device for counting young fish in a stream of water, including an accounting channel, the top and bottom walls of which are made of an optically transparent material, the illuminator is placed under the bottom wall. a television sensor optically conjugated to a channel and a counting-analyzing unit connected to the latter, a plate is installed in the channel, made of an optically transparent material and a clearance for the passage of fish to be taken into account with the upper wall of the channel; the plate is pivotally movable to adjust the passage cross section gap. FIG. 1 shows the proposed device; in fig. 2 shows section A-A in FIG. 1. A device for counting young fish in a stream of water contains an accounting channel 2 located in housing 1, the upper 3 and lower 4 walls of which are made of an optically transparent material, are installed parallel to each other and tightly attached to the housing 1, while below the lower wall 4 the illuminator 5, and the upper wall 3 is closed by a screen 6, on which the television sensor 7 is located, optically coupled to the recording channel 2 and connected to the counting and analyzing unit 8. In channel 2, in addition, a plate 9 is installed, made of tically transparent material and forming a gap with the upper wall 3 for the passage of the fish to be counted. The plate 9 is reinforced in the housing 1 by means of hinges 10, which ensures its movement to regulate the flow area of the gap. The device works as follows. Young fish with water flow moves through metering channel 2, the cross section of which in one place is scanned by a television sensor 7 operating in a single-line scan mode. Image scanning in the longitudinal direction is carried out due to the movement of young fish with a stream of water. Video pulses from the output of the television sensor 7 contain complete information about the images in the accounting channel. The video impulse data is fed to the input of the counting and analyzing unit 8, which processes them and extracts information about the number of young fish that passed through the recording channel 1. The maximum amplitude of the video pulses is provided by the backlight of the accounting channel 2 fish fry is moving, there is a gap between the plate 9 and the upper wall 3 of channel 2. To form a single-layer flow of the water-fish mixture, the height of the cross section of this gap is adjusted and set, based on the size ypuskaemogo species of juvenile fish. To do this, move the plate 9 on the hinges 10 and set it so that the gap between it and the wall 3. Ensures that there are no distortions of the optical images in the recording channel 1. When using this device, there is no need to use special devices kind of. The use of the device will automate the process of accounting with an increase in its reliability and objectivity. A device for counting young fish in a stream of water, including a metering channel, the top and bottom walls of which are made of optically transparent material, an illuminator placed under the bottom wall, a television sensor optically coupled to the channel, and a counting-analyzing unit associated with the latter; the fact that, in order to ensure accurate counting of young fish of different fish species, a plate is installed in the channel, made of optically transparent material and forming a gap for the outer wall of the channel rokhoda considered fish, while the plate is installed hingedly movable to adjust the flow area of the gap. Sources of information taken into account during the examination 1. USSR author's certificate in application No. 2833040 / 28-13, cl. A 01 K 61/00. 2.Artemyev, E.A. and Yanayev, Sh. Ya. Quantitative accounting of juvenile fish. - “Fish farm, 1980. № 10, p. 35-36.