SU1755751A1 - Method for registering fish in water flow - Google Patents

Abstract

Use: The method is applied to counting fish in a stream of water to increase the accuracy of counting. SUMMARY OF THE INVENTION: The method includes passing fish through counting channels, receiving signals using the shadow method from a sensor present in each counting channel. The sensor contains several optoelements that operate in a pulsed power mode, with the power being alternately fed to each of the optocell elements. 6 Il.

Description

The invention relates to industrial fish farming, in particular, to methods of automatically counting the amount of fish grown, mainly juveniles.

The purpose of the invention is to improve the accuracy of the fish.

The method includes passing fish with a flow through the counting channels, in which optical-electronic sensors are installed that produce a signal using the shadow method. Each sensor consists of several optoelements that include emitters and receivers of light in pairs and with respect to each other. The sensor signals are post-processed. Increasing the accuracy of fish counting is achieved by the fact that the sensor signals are received with pulsed power of the optoelements, and each sensor optoelectric element is fed alternately.

The essence of the method is explained in FIG. 1 ... 6. FIG. 1 shows a diagram of the spatial placement of sensors in the counting channels when three optoelements are installed in each counting channel, figures 2 .. 4 show the time diagrams of the pulses for alternately feeding the optoelement sensors in three different passage ways for different fish counting channels with the same speed during Tp equal the duration of one cycle of the clock polling pulses of the sensors, figs, 5 and b show the power supply circuits of the light emitters and light-receivers in the example implementation of the invention, respectively Lok LED and photodiode unit. Moreover, in FIG. 1a shows the layout of the sensors in a vertical section, and FIG. 16 - in plan, a horizontal section, where ai, bi, ci are the emitters of the Pro channel, a /, bi, c / are the emitters of the 1st channel and, in addition, in FIG. Figure 1a shows the case of parasitic illumination of the light-receiver in the first counting channel, if all the optoelements of the sensor are fed simultaneously as in the known device. FIG. 2 .. 4 in the graphs a) clocking pulses are shown, in graphs b) - at the output of the light-receivers and c) - at the output of the amplifier. Here, Smin is the minimum signal level required to generate the counting unit, with FIG. Figure 2 shows the case of shading all three photodetectors with fish, FIG. 3 shows the case of shading only the second and third phototours with fish. ™

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and FIG. 4 - in the case of the shading of only one third photo thermometer by fish. This means that these fish are either of different thickness or the counting channel passes in different ways: directly or obliquely,

Example. For carrying out the method, a known industrial product with eight counting channels was used. Three optoelements with a coaxial arrangement of light emitters and photosensitive receivers were installed in each channel, the AL 107 LEDs of the AL 107 type were used as the first ones, and the PDD66 photodiodes were used as the second ones. all eight counting channels. When any of the light detectors of any sensor optocoupler was shaded in the memory of the computing device, the count signal of this channel was formed,

As can be seen from FIG. 2. ,, 4 alternate power supply of optical elements inside the sensor prevents the parasitic illumination of the photodetector of one optoelement; light emitter other optoelomenga this sensor in cases where the body

Fish does not obscure the luminous flux of all opto-elements of the channel sensor at the same time. This eliminates the possibility of error, i.e. an increase in the accuracy of fish counting In addition, since the signal can be amplified to a value much higher than the threshold Smin, and the photodiode current. from scattered light in the absence of direct irradiation of the light-receivers, it is extremely small, and at the same time the possibility of obtaining higher sensitivity of the sensors is achieved, which also contributes to an increase in the accuracy of fish counting.

Claims (1)

Claims The method of accounting for fish in a stream of water, including passing fish through counting channels, receiving signals using a shadow method of sensors consisting of several optoelemts, and processing signals, which is designed to improve the accuracy of fish counting by eliminating parasitic illumination The signals are received in the pulsed mode of supplying the optoelements of the sensors, and power is supplied to each of the optoelements of the sensor in turn. Sbbto8ody B b} c; # 2 & C 2 tys; aiti & FDA but FIG. g Cycle but Tait / 1 1 pgpshpgpztpgpz S i L at Figz . B 1 P P pn A i Wl / 7 t