SU1516784A1 - Photosensor - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is to improve the accuracy of work by ensuring that the photosensor is monitored during its operation during moments when the product is not in the control zone. The photo sensor contains a generator 9, which, in response to a command from block 18, alternately turns on and off generator 4, which controls the operation of radiator 5. At the moment when generator 4 is turned on, both inputs of element 11 will have an "I" signal when the photo sensor is working correctly and element OR 13 - signal "O". At the moment the generator 4 is turned off, the inputs of the elements NOT 14.16 will have the signals “O” with a properly working photosensor, and the output of the element OR 13 will be the signal “O”. Thus, in the test mode, if the photo sensor is working correctly, the output signal of the circuit will always be "O". 2 Il.

Description

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The invention relates to a measuring technique and can be used to control in the rolling and tube industry as sensors for the position of hot rolled products.

The purpose of the invention is to improve the accuracy of work by ensuring control of the photosensor's operability in the course of its operation in the short run and in the absence of products in the control zone.

FIG. 1 shows a block diagram of a photosensor; in fig. 2 - diagrams of the photo sensor operation in the control mode.

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and through the emitter 5, the radiation modulated with the frequency ff of generator A is sent to the photodetector 1 through the optical nodes 2 and 6. When an object appears in the control zone on the photodetector 1, there is no signal. Amplifier 3 signal does not amplify Ug, 0. In the absence of an object, radiation with a frequency f | passes to the photodetector 1, is amplified and converted by amplifier 3, the signal Uj ,, 1. When it is necessary to test the operation of the sensor from the output of block 18

The photo sensor contains a sequence of 15 control signals is supplied Uy 1, then on

the input element NOT 17 is signal 1, the output is O. The operation of element NOT 17 is permitted.

but connected by a photodetector 1 to an optical node 2 and an amplifier 3, configured to detect a high-frequency signal, the first generator t and the radiation source 5 are connected in series with the optical node 6, which is optically connected to the photodetector 1, the first and second keys 7 and B The second generator 9, the power source 10, the output of which is connected to the second input of the first key 7, the first input of which is connected to the first output of the second generator 9, the second output of which is connected to the first input of the second key 8, the second input of the cat The first is connected to the zero bus, the first element is AND 11, the first input of which is connected to the output of amplifier 3, the second input is connected to the outputs of the first and second key 7 and 8 and the input of the first generator, the element OR NOT 12 and the element OR 13, the first element NOT And whose input is connected to the output of the amplifier 3 and the second element And 15, the output of which is connected to the second input of the element OR 12, the second element NOT 1b, the input of which is connected to the output of the first key 7, the output connected to the second input of the second element And 15, the third element is NOT 17, the output of which is connected to the second the input element OR 13, the control unit, the output of which is connected to the input of the second generator 9 and the input of the third element NOT 17.

(The sensor works as follows.

While the sensor operation is not checked, the control voltage Uy О, on the first output of the generator 9 is signal 1, on the second - O. Key 7 is on, key 8 is off. The generator is powered, it works.

and through the emitter 5, the radiation modulated with the frequency ff of generator A is sent to the photodetector 1 through the optical nodes 2 and 6. When an object appears in the control zone on the photodetector 1, there is no signal. Amplifier 3 signal does not amplify Ug, 0. In the absence of an object, radiation with a frequency f | passes to the photodetector 1, is amplified and converted by amplifier 3, the signal Uj ,, 1. When it is necessary to test the operation of the sensor from the output of block 18

control is given Uy 1, then

1, and O.

the input element NOT 17 is signal 1, the output is O. The operation of element NOT 17 is permitted.

The generator 9 begins to operate with a frequency, f (Fig. 2a). The signals from the first and second outputs of the generator 9 are out of phase with 1 to O and vice versa. While the signal at the first output of the generator is equal to the signal at the second output is equal to the key 7 is on, the key 8 is off. The generator produces a frequency f (Fig.26). The signal passes to the photodetector 1, at the output of the amplifier 3 signal 1 (figv). When the generator 9 at the first output generates a signal O at the second output - signal 1, key 7 is turned off, key 8 is turned on. At the generator output k, the signal is O, the generator k does not work, there is no radiation, the signal at the output of the photodetector 1 and amplifier 3 is O.

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So, in this mode, when the signal at the generator input k is 1, 1, when the signal at the generator input is O, then Ujj, 0. If there are signal 1 at these points on both inputs of the And 11 element, signals 1, and output 1 is signal (figg).

When the signal O, Ug, x 0 appears at the input of the generator k. If there are NOT AND and 16 O signals at the inputs (fig.2d), the output signals at the output elements d are the signals r, at the output TA-15 signal 1 (FIG .2e).

So, when generator 9 is operating, signal 1 appears alternately at the outputs of elements 11 and 15, These signals, passing through elements 12 and 13 to the output, give O all the time during generator 9 and the presence of Uy 1 with a good sensor (fig.2zh);

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The presence of C indicates the following: the generator is in good condition; the emitter 5 is working properly; good nodes 2 and 6; open channel between nodes 2 and 6 (for example, there is no dirt, etc.); emitter 5 is directed correctly to the photodetector 1; photo detector 1 is working properly; good amplifier 3.

So, by doing so, a complete check of all the components, all parts of the sensor and the correctness of the body - the day is carried out. The presence of the signal f allows checking the path from the sensor to the control device by signal

When the signal Uy O is removed at the first output of the generator 9, the signal 1, at the second output, the signal O, a continuous voltage is applied to the generator and it turns on continuously. Thus, the sensor operates in normal operating mode. At the output of the element OR NOT 12 - signal 1, UKO "HI Control stops.

The presence in the sensor device of a complete check of all components of the sensor and at the same time correct guidance allows monitoring of work at any time - before starting work, during stops, etc., which sharply increases the reliability of AUSTTP, and in particular , sensors. Formu, l and inventions

A photo sensor containing serially connected first generator

and a power source connected in series with a photodetector optically coupled to a radiation source, and an amplifier configured to detect a high frequency signal, a power source characterized in that, in order to improve operation accuracy, it is provided with series-connected first element And, the first input of which is connected to the output of the amplifier, an OR-NOT element and an OR element, sequentially connected to the first element NOT, the input of which is connected to the output of the amplifier, and the second element AND, the output to expensively connected to the second input of the element OR NOT, the second element NOT, whose input is connected to

20 by the second input of the first element And the input of the first generator, the output is connected to the second input of the second element And, the third element is NOT, the output of which is connected to the second input

25 of the OR element, serially connected by the second generator and the first key, the output of which is connected to the input of the first generator, the second input is connected to the output of the power source, the second key, the output of which is connected to the input of the first generator, the first input is connected to the second output of the second generator, the second input - with zero bus, control unit,

5 whose output is connected to the input of the second generator and the input of the third element is NOT.

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Claims (1)

SUMMARY OF THE INVENTION A photosensor comprising in series a first generator and a power source, a series-connected photodetector optically coupled to a radiation source, and an amplifier configured to detect a high-frequency signal, a power source, characterized in that, in order to improve the accuracy of operation, it equipped with a first element AND connected in series, the first input of which is connected to the output of the amplifier, an OR-HE element and an OR element connected in series with the first element NOT, the input of which is connected to the output of the amplifier, and the second element AND, the output of which is connected to the second input by the second input is dined with the second input of the second AND element, the third element is NOT, the output of which is connected to the second input of the OR element, connected in series with the second generator and the first key, the output of which is connected to the input of the first generator, the second input is connected to the output of the power source, the second key, the output of which is connected to the input of the first generator, the first input is connected to the second output of the second generator ora, a second input a zero bus control unit whose output is connected to the input of the second oscillator and the input of the third element NO. element OR-HE, the second elene, the input of which is connected to the input of the first element And and the first generator, the output soy1516784 Mode 1 Riga 2 Mode 2