SU907564A1 - Optic device for recognition of moving object number - Google Patents

Description

(54) OPTICAL DEVICE OF IDENTIFICATION OF NUMBER OF MOVING OBJECT

The invention relates to information from the motions xc objects, in particular for recognizing the numbers of animals and railway cars.

Devices for reading information from moving objects are known, which contain a code sensor made of a material coated on

 light strips and an on-site light source, a photoelectric converter, a reading unit including a pulse shaper connected to the information input of the shift register, the outputs of which are connected to the display unit via a decoder, a pulse counter, a HE element and a scan mirror control unit 1 . A disadvantage of the known device is the reliability of recognition of the object number.

The purpose of the invention is to increase the reliability of receiving information.

The goal is achieved by the fact that the known device is equipped with a delay element, a sensor. the position of the mirror, a trigger, two And elements and a differentiating element, the input of which is connected to the pulse shaper, and the output through the delay element and the element NOT to the two inputs of the first element And, the output of which

to is connected to the trigger input, the outputs of which are respectively connected to the first input of the element NOT and the first input of the second element I, the second input of which is connected to the output

ts counter connected to its input with the output of the element NOT and the read input of the shift register connected by the information input to the shaper pulse, and the second

The 20 input of the element is NOT connected to the first input of the mirror position sensor, the second output of which is connected to the installation inputs of 39 triggers, the register of the scraper and the counter, respectively, and the input to the control unit of the scanning mirror. The drawing shows the structures on the skeme of the proposed device. The device contains a source of light 1, an encoder 2, a photoelectric converter 3 connected to a driver 4 pulses. To the output of the imaging unit 4 pulses Connected to the differentiating element 5 and the information input, shift register 6. The output of the differentiating element 5 is connected through the delay element 7 and the element NOT 8 two inputs of the element AND 9. The output of the element 9 and 9 is connected to the trigger 10, the outputs of which are connected through the element NOT 1 1 to the register 6 and one of the inputs of the element 12 and Another input element I 12 is connected to a pulse counter 13 connected to the mirror position sensor 14 and to the setup inputs of the register 6 and trigger 0. The outputs of the register 6 are connected via the decoder 15 to the display unit 16. A scanning mirror control unit 17 is connected to the mirror position sensor 14. The device operates as follows. (J At the beginning of each scanning period of the beam in the read zone in which sensor 2 can be found, from the output of the position sensor 14 to the trigger trigger input 10, the counter 13, the register 6 and the display unit 16 receive the initial installation signal. With this signal the counter 13, the register 6, the display unit 16 and the trigger 10 are set to 1 logical O, in which from the first output of the trigger 10 to the control input of the element H 11. The prohibitory signal is received, and from the second output to the first input of the element I, the resolution signal. The beam from the light source 1 hits the mirror 18, is scanned across the surface of the sensor 2. Reflected from the sensor strips. which are formed into rectangular pulses entering the imaging unit 4. From the output of the imaging unit 4, the read code messages of the sensor 2 in the form of rectangular pulses are fed to the information input of the shift register 6, as well as to the input diff Differentiating element 5. Passage through differentiating element 5, these pulse signals are differentiated by the leading and trailing edge. Then, from the output of differentiating element 5, the signals that determine the moments of the leading and trailing edges and the readable single code parcels form. The duration of a readable single parcel of start and stop pulses is equal to half the duration of a single information parcel. Provided that the delay time of the signal from the output of differentiating element 5 in delay element 7 is equal to half of the DIrIitality of the readable information parcel at the inputs of element And 9, a differentiating signal of the leading and trailing edges of a single pulse of the starting element of sensor combination 2 is simultaneously formed, and at its output trigger signal. This signal from the output of the AND 9 element is fed to the counting input of the trigger 10, putting it into the state of logical 1, in which from its first output the enable signal to the control input of the HE II element, and from its second output to the first input of the AND element 12 signal ban. Then, the clock signals from the first output of the position sensor 14 through the element NOT 11 arrive at the input of the record of the shift register 6, record and successively advance and its bits of the readable data messages. In addition, the clock pulses from the output of the element NOT 11 also arrive at the input of the counter 13, the capacity of which is equal to the size of the information code combination of the object number on the sensor 2. After reading all the information messages from the sensor 2, a stop signal will be received. At the output of the element And 9 in Wits trigger signal. At this moment, this signal will translate the trigger 10 into a logical O state, in which the prohibition signal is output at the output of the element 11. And the enable signal at the input of the And 12 element. Since the counter 13 receives the number of clock pulses equal to the number of information code messages of the sensor 2, at its input a read signal is received, which, arriving at the second input of the element

and 12, coincides in level with the signal at its first input. Therefore, at the output of the element 12 on the Wits, the signal of the scans, upon receipt of which, the binary code code HOMe; ia of the object written in them will be read from the bits of the bits in the register 6. This code combination in the binary code in the decoder 15 is decoded into the binary-decimal code combination and then goes to the display unit 16.

In case the sensor 2 is not completely in the read zone, the code combination read from its surface is not registered.

The proposed device will allow increasing the reliability of the counted information by more than an order of magnitude.

Claims (1)

1. USSR author's certificate 35 S470426, cl. In 61 L 25/06, 1972 (prototype).