SU594456A1 - Correlation-type velocity meter - Google Patents

Description

The invention relates to the field of engineering and can be used to measure the speed of movement of an object according to the speed of movement of the image of the underlying surface, for example, in compensators for high-speed lubrication during photographing. A device for measuring linear velocity is known based on the correlation measurement method ij. A disadvantage of this device is the presence in it of an adjustable delay unit containing mechanical components. Also known is a correlation velocity meter containing two spatially separated photoconverters connected to a correlator and an extreme control unit connected to a control input of a variable frequency generator, the output of which is connected to a speed recorder. This device does not provide high accuracy of measurement 2}. The purpose of the invention is to improve the accuracy of the velocity measurement. This goal is achieved by the fact that one of the FSL transducers is made as a linear device with charge coupling with the first element open for light rays and shaded by the others, and the other phototransducer is designed as a single-element charge coupling device, and the control inputs of the devices with charge coupling is connected to the output of the pulse generator. The drawing shows a flow chart of the proposed correlation velocity measurement. The optical image of the moving underlying surface 1 with the help of lens 2 is projected onto the photosensitive surface of the first nominal element of the linear device 3 with charge coupling (CCD) and the single-element CCD 4 located along the line of motion of the image. Linear device 3 with charge coupling consists of W ns 1 of the terminal elements a. Device 4 with charge coupling - from one nominal element. Both CCDs are designed to convert the light flux into an electrical signal. The CCD 3 also provides a signal delay for a time proportional to the number (rt-l) of its elements and inversely proportional to the read frequency of the charge packets. The outputs of the devices with charge coupling through the amplifiers 5 and b of the video 2 signals are connected to the separate inputs of the correlator 7, which calculates the function of mutual correlation of the input signals. The output of the correlator 7 through an extreme regulator 8 is connected to the input of the generator 9 shear pulses. The number of phases of the shear generator is determined by the type of charge-coupled devices used. The extreme regulator is designed to maintain such a control voltage at its output wherein the signal at the output of the correlator of torus 7 is maximal. The output of the generator 9 is a shift of Bfcjx pulses, also connected to the input of the speed recorder 10, which, by the Pulse Frequency of the generator 9, determines the speed of movement of the carrier,.

The correlation velocity model works as follows.

The image of the underlying surface 1 through the lens 2 falls on the photosensitive surfaces of the first nominal element of the linear device 3 with charge coupling and the element device 4 with charge coupling. Depending on the speed of movement of the submersion | w, the same image section of the surface due to the separation of the CCD 3 and 4 across the base falls on their photosensitive surfaces at different points in time, and the first nominal element of the CCD 3 is earlier than the single-element CCD 4 When increasing the speed of movement, this time interval decreases, as the speed increases, it increases. The delay time of the video signal in the linear device 3 with charge coupling is inversely proportional to the frequency of the shear pulses and proportional to the number of its nominal elements. By changing the frequency of the shear pulses, the problem of increasing or decreasing the time shift between the output signals of the CCD 3 and 4 is solved. Video signals from the outputs of devices with charge coupling are amplified by amplifiers 5 and 6 and fed to separate inputs of the correlator 7.

The extremal regulator 8 controls the generator of 9 pulse pulses in such a way that the signal at the output of the correlator 7 is maximum. Under this condition, the video signals are the same at the output of the CCD 3 and 4. The speed recorder 10 according to the frequency of the shear pulses VELCHRYS the speed of movement of the image in the focal plane V according to the formula

III,

where G is the frequency of advancement of the charge package by nominal elements

P is the distance between the nominal elements exhibited;

riff is the number of nominal elements of the first linear device with charge coupling.

Claims (1)

Invention Formula A correlation velocity meter, comprising two extruded regulator connected to the base of a photoconverter, connected to an accelerator, connected to a control input of a variable frequency pulse generator, the output of which is connected to a speed recorder, characterized in that, in order to improve accuracy, one of photoconverters made as a linear device with charge coupling with the first element open for light rays and shaded by the others, and another photoconverter made in Ideal one-element device with a charge coupling, and the control inputs of the devices with charge coupling are connected to the output of the pulse generator. Sources of information taken into account during the examination: 3 1. Kozubovsky S.F. Correlation extremal systems, Kiev, Naukova Dumka, 1973, p. 36, pICo23. 2, USSR Copyright Certificate W 253462, CL Q 01 P 3/54, 1968.