SU1216641A1 - Device for measuring object diameter - Google Patents

Description

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The invention relates to a measurement technique and may be called HcnqBb for measuring the diameter of objects having a reflective surface.

The aim of the invention is to improve the accuracy of measuring the diameter of objects having reflective surfaces.

Figure 1 shows the functional diagram of the device; FIG. 2 shows the course of the rays when scanning an object;) FIG. 3 shows the time diagrams of signals at the output of individual nodes of the device

The device contains optically coupled light source 1, a condenser 2, a rotating mirror 3, a collimating lens 4 (the axis of rotation of the reflecting surface of mirror 3 passes through the focal plane of the collimating lens 4), a focusing lens 5 5, a two-site receiver 6, a control unit 7, a state The main amplifier 8 and 9, the inputs of which are connected to the outputs of the double-stage photodetector 6, the adder 10, whose inputs are connected to the outputs of the amplifiers 8 and 9, the differentiation unit 11, the input of which is connected to the output of the adder 10, la 12 polarity selection, the input of which is connected to the output of the differentiation unit 11, drivers 13 and 14, whose inputs are connected to the outputs of polarization selection node 12, multivibrators 15 and 16, whose inputs are connected to the outputs of the formers 13 and 14, trigger 17, The night inputs of which are connected to the outputs of multivibrators 15 and 16, and the switch 18, the control input of which is connected to the output of the trigger 17, the information inputs of the switch 18 are connected to the outputs of the double-plate photoreceiver 6, pulse duration measurement unit 19 Whose input is connected to the output of the switch 18,

The diameter of the object 20, located between the collibir 4 and the focusing 5 lenses, is measured.

The device works as follows.

A beam of light (formed by the source of light 1) is directed through the condenser 2 to the rotating mirror 3. A moving parallel is formed at the output of the collimating lens 4

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but its optical axis is a narrow beam of light crossing object 20,

Using a focusing lens 5 on a two-stage photodetector 6

a beam of light varying in intensity and converted by it into electrical signals is directed.

Electrical signals taken from the two-site photodetector 6,

arrive at the information inputs of the switch 18, from the output of which the information signal goes to the pulse width measuring unit 19, measuring the time interval, the duration of which is proportional to the diameter of the object 20,

The control of the switch 18 is carried out by the control unit 7. When scanning an object with 20 knots. A beam of light on both sites of the two-site photodetector 6 produces signals whose durations are related to the diameter of the object 20, However, for each of the sites

two-site photodetector 6, iiOMi MO of information luminous flux, the change of which is associated with the intersection of the object beam by the scanning beam of the object, non-information light streams enter, formed by reflection of the scanning beam of rays from the reflecting surfaces of the object 20 (FIG. 2), which create a shift of information signals output of the two-site photodetector

b by the value of ut (FIGS. 3, 6a, 6b),

The signals taken from the two-site photodetector 6 are amplified by amplifier 8 and 9, summed by adder 10, differentiated by node 11 differential (|) differentiation and fed to node 12 of polarity selection, which transmits positive polarity pulses to one of its outputs, and to another the output transmits negative-polarity pulses that are generated by the formers 13 and 14,

The output pulses of the formers 13 to 14 are triggered by the waiting multivibrators 15 and 16, the output signals from which alternately flip over the trigger 17 5 an output signal from which alternately connects the two-site photodetector pads

the photodetector 6 to the input of the pulse duration measuring unit 19.

Since at the moment of intersection of an object’s edge by a scanning beam of rays

3, 12.1664

Information beams of beams are projected onto one of the sites of the two-site photodetector 6, this site is connected by the switch 18 to the input of the unit 19 for measuring time 5 intervals.

The moment of intersection of the opposite edge of the object by a scanning beam of rays, to the input of the time interval measurement unit 19 is connected another platform of the two-site photoreceiver 6.

Thus, the effect on the duration of the information pulse of non-information beams of rays reflected from the reflecting surface of the object is eliminated.

The use of the device makes it possible to increase the accuracy of measuring the diameter of objects with a reflective surface by reducing the effect on the measurement result of non-information beams of rays reflected from the surface of the object.

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Compiled by T. Aisin Editor N. Egorov Tehred M. Parotsay Corrector S. Shekmar

Order 993/51 Circulation 671 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5

Branch ShSh Patent, Uzhgorod, st. Project, 4

Claims (2)

class G 01 B 11/04, 1976. '1. A DEVICE FOR MEASURING A DIAMETER OF OBJECTS, containing optically coupled light source, a condenser, a rotating mirror, a collimating lens, the axis of rotation of the reflecting surface of the mirror passes through the focal plane of the collimating lens, focusing lens, photodetector, and a pulse duration measuring unit, characterized in that, in order to increase the accuracy of measuring the diameter of objects having a reflective surface, it is equipped with a control unit, a switch, the control input of which is connected to the output of the control unit, the output of the switch is connected to the input of the pulse duration measuring unit, the photodetector is made two-site, the outputs of the photodetector are connected to the information inputs of the switch and the inputs of the control unit, the photodetector is installed in the focal plane of the focusing lens. 2. The device according to claim 1, characterized in that _the control unit is made in the form of an adder 9, the inputs of which are the inputs of the unit, the differentiation unit, the input of which is connected to the output of the adder, the polarity selection unit ^ whose input is connected to the output of the differentiation unit , two shapers, the inputs of which are connected to the output of the polarity selection node, two multivibrators, the inputs of which are connected to the corresponding outputs of the trigger shapers, the installation inputs of which are connected to the outputs of the multivibrators, the trigger output but is the output of the block.