SU853545A1 - Object image speed-of-movement pickup - Google Patents

Description

(54) IMAGE MOTION SPEED IMAGE OBJECT SENSOR

The invention relates to instrument making and can be used to measure the speed of movement of the underlying surface, for example, in speed sensors of speed compensators for aerial photography.

Opto-electronic measuring instruments for the speed of movement of the image Llj containing point photovoltage transducers and an electronic circuit, which includes an adjustable delay unit, are known.

A disadvantage of the known sensors is a decrease in the accuracy of determining the speed with a substantial non-stadiality of the parameters of the underlying surface.

The closest in technical essence is an object speed sensor (2, containing an optical system, a light splitter, two television cameras on linear devices with charge coupling, oriented along the direction of the image motion, the outputs of which are connected through amplifiers to the inputs of the corresponding peak detectors, the control inputs of the linear devices with charge coupling are connected to the outputs of the shear pulse generators, while one of the generators is tunable in frequency, input d its connected to the extreme output

ten

frequency controller, and the output is connected to the input of the speed recorder.

A disadvantage of the known sensor is the insufficient accuracy of measuring the speed of the image,

15

Associated with the small steepness of the adjusting characteristics of the extremal controller.

The aim of the invention is to improve the accuracy of measurement and expansion

30 range of measured speeds.

The goal is achieved by the fact that a subtraction unit is inserted into the device, and the second generator of shift pulses is tunable. The frequencies of the shear pulses of the first and second generators of the shear pulses differ from each other by a certain value, which is the basis for the used differential method of forming a feedback circuit. Each of the inputs of the subtraction unit is connected to the output of the corresponding peak detector of the prototype, and the output is connected via a frequency controller to the control inputs of the tunable shear pulse generators.

The drawing shows a structural electrical circuit of the device.

The sensor contains the optical system I, the light splitter 2, receiving the signal / j from the underlying surface 3, linear devices with charge coupling 4 5, subtraction unit 6, amplifiers 7, 8, peak detectors 9, 10, frequency regulator 1 I , tunable shear pulse generators 12, 13, speed recorder 14.

The successively placed optics system 1 and the light splitter 2 are optically coupled with linear devices with charge coupling 4 and 5. The output of each linear device is connected to the inputs of subtractor 6 through the corresponding series-connected amplifier 7 or 8 and peak detector 9 SHI-10. The output of the subtraction unit b through the frequency regulator 1 I is connected to the control inputs of the tunable shift pulse generators 12 and 13. The output of each shift pulse generator is connected to the control input of the corresponding linearly of the instrument 4 and 5. Speed logger 14 a connected to the input of the tunable oscillator output of the first shift pulse 12, vychiel a movement speed of the object image.

The device works as follows. The image of the underlying surface 3 with the help of the optical system is projected onto the light splitter 2, where it is split into two identical optical image signals. These signals fall on the photosensitive surfaces of linear devices with radiation contacts 4 and 5. Under the influence of the optical signal, they accumulate charge packets. Using the shear pulses of the tunable shear generators 12 and 13, the charge packets continuously move toward the output, so that their direction of motion coincides with the direction of motion of the image of the underlying surface 3. The shear frequencies of the tunable oscillators 12 and 13 are different from each other by a constant value . Therefore, the rates of advancement of charge packets in linear devices will be different: for example, in the first one they are greater than in the second. The charge packet, passing from the previous electrode of each device to the next one, is added to the charge packet that occurs under this electrode as a result of the accumulation of charge under the influence of light in the interval between successive shear pulses. As a result, a charge packet equal to the sum of charges generated in all its storage cells as the charge packet advances, i.e., will be created under the output electrode of the linear device with charge coupling. charge integration will occur. In the case when the rate of advancement of the charge packets is equal to the speed of the image, the accumulative cells will subsequently receive a charge from one area of the underlying surface, and the charge packet at the device output will be determined only by the brightness of this area, and the voltage Hai of the output of the corresponding peak detector will be maximum.

Claims (2)

As the considered speeds differ in accumulative cells, charges arise from different parts of the underlying surface 3, and the output charge packet is determined by the brightness of several adjacent areas of the underlying surface. There is a high-speed lubrication of charge packages. Therefore, the voltage at the output of the peak detector 9 or 10 will decrease as the speed of movement of the charge packets in the corresponding device 4 or 5 differs from the speed of the image. The voltages from the output of each peak detector 9 and 10 are fed to the inputs of subtraction unit 6. The output voltage of the subtraction unit will be zero when the speed of the image of the underlying surface is equal to the arithmetic average speed of the advance charge packets in linear devices with charge Curve 4 and 5. In the case of the difference between the indicated speeds, the output of the subtraction unit will act on a voltage, the sign of which characterizes the sign of the magnitude of the deviation of the image motion speed from the arithmetic average the amplitude indicates the deviation value itself. The frequency regulator controls the frequency of the shear pulses of the tunable shear pulse generators so that the voltage at its input is kept equal to zero. The speed recorder 14 uses the frequency of the shear pulses at the output of the tunable shear pulse generator 12 and the known frequency difference of the tunable shear pulse generators 12 and 13 to calculate the arithmetic average rate of advance of the charge packets equal to the desired motion speed of the underlying surface. . Due to the proposed technical solution, the extreme controller is excluded from the device circuit. This improves the accuracy of measuring the speed of movement of images. The absence in the device schema support | The generator of shear pulses, which determined the average frequency of the range of measured velocities, leads to the expansion of this range and ensuring equal accuracy of measuring the velocity over the entire range. An image speed sensor of an object containing successively placed optical system, a two-way splitter and two television cameras on linear devices with charge coupling, oriented along the direction of the image movement, the output of each of these devices is connected through an amplifier to the input of the corresponding peak detector , and the control inputs of each of the linear devices are connected to the outputs of the corresponding pulse shear generators, with the first generation the shift pulse pulse is tunable in frequency, its input is connected to the output of the frequency regulator, and the output is connected to the input of the speed recorder, which, in order to improve the accuracy of speed measurement and expand the range of measured image speeds, the subtraction unit, the second shift pulse generator is tunable in frequency, while the outputs of the peak detectors are connected to the inputs of the subtraction unit, the output of which is connected to the regulator input h Frequency, the output of the frequency controller is connected to the input of the second generator of shear pulses, and the frequencies of the tunable generators of shear pulses differ from each other by a constant value. Sources of information taken into account in the examination 1. Kozubovsky S.F. Correlation extremal systems, Kiev, Naukova Dumka, 1973. 2. For the number of 2612555 / J8-10, cl. G 01 R 3/36, 05.05.78, according to which a decision was made to issue an author's certificate (prototype).