SU1730538A1 - Device for measuring displacement of the edge of non- transparent object - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is to enhance the functionality by measuring the displacement of the second edge of an opaque object located perpendicular to the first edge. Light source 1 forms a beam of light. With the help of collimating and focusing lenses 2.4, the shadow image is an opacity. The invention relates to a measurement technique and can be used for non-contact measurement of the displacement of two perpendicular edges of various opaque objects. A device for measuring the distance between the edges of the shadow projection of objects is known, which contains optically coupled radiation sources, a projection optical system, an analyzing scale, signal processing units, and display devices. The main object 3 is projected onto the linear device 5 with charge coupling. A synchronous generator 6 generates control signals for a linear device 5 with charge coupling. Shaper 7 video generates a video signal. With the help of the source 8 of the reference voltage, the comparator 9, the generator 10, the element And 11, two bursts of pulses are formed. The number of pulses in each burst is proportional to the displacement of one of the edges of the opaque object 3. The number of pulses in the first burst is counted by the first counter 15, stored in the first register 17 and indidirued by the first indicator 19. The number of pulses in the second burst is counted by the second counter 16, memorized in the second register 18 and indicated by the second indicator 20. Pulse selection is carried out by the switching unit 12 controlled by the synchronous generator 6. The blocks 13, 14. 21, 22, 23, 24 carried out m Scaling measurement and assigning a measurement result to the initial value m. 4 yl. The disadvantages of the known devices are the limited scope and low productivity of the measurements. The closest technical solution to the invention is a device for measuring the edge displacement of an opaque object, comprising an optically coupled light source, an optical system, a photodetector made in the form of a linear device with charge coupling, a clock generator. the first output of which is connected to the control input of the linear Ј CO o ate with 00

Description

device with charge coupling, video driver, the input of which is connected to the output of the linear device with charge coupling, reference voltage source, comparator, inputs of which are connected to the output of the video signal conditioner and reference voltage source, generator, And element, the inputs of which are connected to the output of the comparator and the output of the generator, the first counter connected in series, the first register and the first indicator, the information input of the first counter are connected to the output of element I.

The drawback of the device is the possibility of measuring the edge displacement of an opaque object in only one of the directions

The purpose of the invention is to enhance the functionality by measuring the displacement of the second edge of an opaque object located perpendicular to the first edge.

This is achieved by the fact that the proposed device for measuring the edge displacement of an opaque object is provided with a second counter, a register and an indicator connected in series, the information input of the second counter is connected to the output of the AND element, the switching unit whose outputs are connected to the installation inputs of the first and second counters, the first and the second register, the sync generator is equipped with the second and third outputs connected to the inputs of the switching unit; the shadow image of the opaque object is projected onto A linear device with charge coupling in such a way that its perpendicular edges are projected onto different parts of the photosensitive area of the linear device with charge link.

FIG. 1 shows a functional diagram of the device; in fig. 2 is a functional diagram of a switching unit; FIG. 3 shows the arrangement of the edges of an opaque object relative to a linear device with charge coupling; in fig. 4 - timing charts of signals generated at the outputs of individual units of the device.

The device contains optically coupled light source 1, collimating lens 2, opaque object Z. focusing lens 4, linear device 5 with charge coupling (CCD), synchronous generator 6, the first output of which is connected to the control input of the CCD 5, driver 7 video signal, the input of which is connected to the output of the CCD 5, the source 8 of the reference voltage, the comparator 9, the inputs of which are connected to the output of the imager 7 of the video signal and the source 8 of the reference voltage, the generator 10, the element 11, the inputs of which are connected to the output of the comparator

9 and generator 10, switching unit 12, the inputs of which are connected to the second and third outputs of the synchronous generator 6, scaling units 13, 14, whose inputs are connected to the output of the And 11 element, the first and second counters 15, 16, whose inputs are connected to the outputs of the blocks 13, 14 scaling, the first and second registers 17, 18, the inputs of which are connected to the outputs of the first and second counters 15, 16,

5, the first and second indicators 19, 20, whose inputs are connected to the outputs of the first and second registers 17, 18, the conversion coefficient setting units 21, 22, the outputs of which are associated with the first and second scaling units 13, 14, the first and second units 23 , 24 entering the initial data, the outputs of which are connected to the first and second counters 15, 16, the outputs of the switching unit 12 are connected to the installation inputs of the first and second counters 15. 16, the first and second registers 17, 18.

Switching unit 12 is designed as a counter 25, decoders 26, 27 connected to the output of counter 25, one-oscillators 28, 29 whose inputs are connected to the outputs of decoders 26, 27, and inverter 30, whose output is connected to the installation input of counter 25.

The device works as follows.

The light source 1 forms light beams converted by the collimating lens 2 into parallel ones.

Shadow image opaque

0 of the object 3 is constructed by the focusing lens 4 in the plane of the photosensitive sites of the CCD 5. The clock generator 6 generates the control signals of the CCD 5, which are used to accumulate and read charges from the CCD 5.

At the output of the CCD 5, a signal is periodically generated, the amplitude of which is proportional to the distribution of illumination along the photosensitive areas of the CCD 5.

0 The signal from the CCD 5 is fed to the video signal forming unit 7, at the output of which a normalized video signal is generated. The normalized video signal is fed to the first input of the comparator 9, to the second input

5 which receives the reference voltage from the source 8 of the reference voltage.

At the output of the comparator 9, pulses are formed when the video signal exceeds the reference level. The pulses generated at the output of the comparator 9, arrive at

the first input of the element 11, to the second input of which impulses of higher frequency are received from the generator 10. At the output of the element 11, two bursts of pulses are formed, which enter the scaling blocks 13, 14 where they are normalized by the conversion coefficient. The magnitudes of the transform coefficients are set using the transform coefficient setting units 21, 22.

The number of pulses generated at the outputs of the scaling units 13, 14 is counted by the first and second counters 15, 16 stored in the first and second registers 17, 18 and indicated by the first and second indicators 19, 20.

At the beginning of the formation of the signal at the output of the CCD 5, the synchronous generator 6 generates a signal arriving at the input of the switching unit 12. At the output of the inverter 30, a signal is formed that sets the first counter 15 to the zero state. The first burst of pulses, the number of pulses in which is associated with the distance from the edge of the photosensitive areas of the CCD 5 to the first edge of the opaque object 3. is counted by the first counter 15.

After the end of the zone in which the first edge of the opaque object 3 can be located, the counter 25 forms the first code that is decoded by the decoder 26. At the output of the decoder 26, a signal is generated that triggers the one-shot 28, the output signal of which translates the first counter 15 into the first register 17. The initial value of the first counter 15 is set by the first initial data input unit 23.

The first indicator 19 records the result associated with the position of the first edge of the opaque object 3, i.e. the distance AB (Fig. 3). In this case, the second counter 16 is also zeroed out. A second batch of pulses, the number of pulses in which is associated with the distance from the second edge of the opaque object 3 to the edge of the photosensitive areas of the CCD 5, is counted by the second counter 16. After the end of the CCD 5 polling, the counter 25 forms the second code which is decoded by the decoder 29. At the output of the decoder 29, a signal is generated that triggers the single-vibrator 29, on the output of which the contents of the second counter 16 are copied to the second register 18. The initial value the second counter 16 is set by the second input data block 24.

The second indicator 20 records the result associated with the position of the second edge of the opaque object 3, i.e. the distance of the LED (Fig. 3).

The use of the device allows to extend its functionality by simultaneously measuring the spatial position of the two edges of the opaque object 3.

Claims (1)

Apparatus of the Invention A device for measuring the edge displacement of an opaque object, comprising an optically coupled light source, an optical system, a photodetector made as a linear device with charge coupling, a synchronous generator, the first output of which is connected to a control input of a linear device with charge coupling , a video signal former, the input of which is connected to the output of a linear device with charge coupling, a reference voltage source, a comparator, whose inputs are connected to the output of a video signal conditioner and and A reference voltage source, a generator, an And element, whose inputs are connected to the comparator output and the generator output, are connected in series to the first counter, first register and first indicator, the information input of the first counter is connected to the comparator output, characterized in that, in order to expand the functional capabilities by measuring the displacement of the second edge of an opaque object located perpendicular to the first edge, it is equipped with a second register connected in series by a second register and a second one The ikator, the information input of the second counter is connected to the output of the element I, the switching unit, the outputs of which are connected to the installation inputs of the first and second counters, the first and second registers, the synchronous generator is equipped with the second and third outputs connected to the inputs of the switching unit, the shadow image of the opaque object is projected on a linear device with a charge connection in such a way that its perpendicular edges are projected onto different parts of the photosensitive area of the linear device Ј chargeable connection, 12 FIG. I Fig.Z l BUT/ US U U UTinrnr-u- Krvr-u-u-u - J .. r-and-ti U U L j, | R willow ny Rig.CH i