SU1571508A1 - Apparatus for measuring the speed of movement of an object - Google Patents

Abstract

The invention relates to a measuring technique and can be used in determining the speed of movement of various objects, such as gas streams, suspensions, rolling strip. The purpose of the invention is to improve the accuracy and expand the scope. The device contains a light source 1, an optical system with a scanner 2, a sawtooth sweep generator 3, a measurement circuit and a recorder 10. The light flux transmitted through the optical system is modulated in amplitude in the area measured by inhomogeneities of a moving object. The movement of the light beam in the measurement zone is provided by the scanner and is carried out at a speed varying linearly according to the signals of the sawtooth generator. The radiation interacting with the measurement object is incident on the photodetector, and after conversion, a pulse is formed in the device, the occurrence of which coincides with the instant of coincidence of the velocity of the beam and the object. At this moment, the readings of the voltage of the generator, calibrated in terms of the velocity of the measured object, read out. 2 Il.

Description

UNION OF 08

SOCIALIST

REPUBLIN

... SUg ,, 1571508 Αί

STATE NOMINATION

BY INVENTIONS AND RELATED ART

AT GNST USSR

DESCRIPTION OF THE INVENTION

TO AUTHOR'S CERTIFICATE

(21) 4381952 / 24-10 (22) 12.12.87 (46) 06.15.90, Bull. No. 22 (72) V.K. Fedorov and A.S. Petrov (53) 531.767 (088.8) (56) No. 1075165, cl. G 01 P 3/36,

USSR copyright certificate 1981.

(54) DEVICE FOR MEASURING OBJECT MOTION SPEED (57) The invention relates to measuring technique and can be used to determine the speed of various objects, such as gas flows, suspensions, rolling strips. The purpose of the invention is improving accuracy and expanding the scope. The device contains a light source 1, an optical one with a scanner 2, a generator of a different sawtooth2 system, a measuring circuit, and a recorder 10. The light flux passing through the forming optical system is modulated in amplitude in the measurement zone by inhomogeneities of a moving object. The movement of the light beam in the measurement zone is provided by the scanner and is carried out at a speed that varies linearly according to the signals of the sawtooth generator. The radiation that interacted with the measurement object is incident on the photodetector, and after conversion, a pulse is generated in the device, the appearance of which coincides with the moment of coincidence of the speed of the beam and the object. At this moment, the readings of the voltage of the generator, graded in the speed of the measured object, are counted. 2 ill.

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1571508 A1

The invention relates to measuring equipment and can be used, for example, in automatic control systems for the movement of gas $ flows, rolling strip.

The purpose of the invention is to improve the accuracy of measurement and the expansion of the scope.

Figure 1 shows the structural diagram of the device; in FIG. 2 is a timing diagram illustrating its operation.

The device comprises a light source 1, a scanner 2, a saw-shaped sweep generator 3, a forming lens 4, a collecting lens 5, a photodetector 6, an amplifier-limiter 7, a high-pass filter 8, a shaper 9, a recorder 10, a slotted diaphragm-20 ragma 11 , a light stream modulator 12, a selective amplifier 13, a demodulator 14.

In Fig. 2a, which shows a timing diagram of the voltage of the signal 25 of the sweep length of the sawtooth generator, v ₄ and v ₂ are the boundary values of the range of measured speeds of the object; on Fig shows the signal at the output of the high-pass filter; on figv - the output signal of the driver.

The device operates as follows.

From the light source 1, the radiation modulated by a modulator 12 enters the scanner 2, which makes angular movements under the influence of a sawtooth voltage of the generator 3 to obtain a variable beam speed in the range of measured speeds. In this case, the frequency of the sawtooth voltage of the generator is constant, and the amplitude that determines the sweep length of the beam in the measurement zone varies linearly and determines the speed of the beam. The light flux passing through the forming optical system is modulated in the measurement zone in amplitude by the inhomogeneities of the moving object, is perceived by the photodetector 6, and amplified in a selective amplifier 13.

At the moment of coincidence of the speed of movement of the beam and the object, the demodulated and formed using blocks 14, 7, 8 and 9 pulse signal is fed to the control input of the registrar 10, which is fixed. proportional to the scan length, the instantaneous value of the signal at the 2nd output of the generator. This signal, calibrated in the value of the speed of the object, is recorded by the registrar.

I

The proposed device provides an integral readout of information about the speed of the object by the frequency of fluctuations of the inhomogeneities of the measured object, which is recorded to a minimum voltage at the output of the high-pass filter.

Claims (1)

Claim A device for measuring the speed of an object, comprising a sawtooth generator, a pulse amplifier, a shaper, a recorder and an optical system from a light source, a slit diaphragm, a scanner, a forming lens, a collecting lens, a photodetector, the scan generator being connected to a scanner and a measuring unit, the photosensor output connected to the input of the amplifier, and the output of the driver is connected to the control input of the recorder, characterized in that, in order to improve accuracy and expand the scope, equipped with a high-pass filter, a light flux modulator, a demodulator, an amplifier-limiter, and a sawtooth sweep generator is made with a linearly varying sweep length and has an additional signal output along the sweep length connected to a registrar, the pulse amplifier is selective, the output of which is through a series-connected demodulator, an amplifier and a high-pass filter are connected to the input of the driver.