SU1585677A1 - Apparatus for determining coordinates of elongated objects in the process of production - Google Patents

Abstract

This invention relates to instrumentation technology. The purpose of the invention is to increase accuracy by increasing the conversion slope and expanding the measurement range by using a mask with holes whose width monotonically non-linearly varies over the entire measurement range. The device consists of the optically coupled illuminator 1, the mask 3 of the photodetectors 7, 8 and 9 and the electronic unit 10. The width of the holes of the mask 3 varies along the measuring direction according to the laws V = H / 2 (1 ± 2 / KX ± √U / K 2X 2 +1), where H is the sum of the width of the holes, K is the steepness of the transformation, X is the coordinate along the measurement direction. The electronic unit 10 processes signals from photodetectors 7, 8 and 9 J 7, J 8 and J 9 in accordance with the expression J 7 - J 9 / J 8-J 9-J 8-J 9 / J 7-J 9. Then on The output of block 10 will contain a voltage proportional to the value of K4, where U is the measured coordinate. 3 il.

Description

The invention relates to instrumentation technology and can be used to control the position of long objects.

The purpose of the invention is to improve the accuracy by increasing the conversion steepness and spreading the measurement range by using a jug with holes whose width varies non-linearly throughout the entire measurement range,

FIG. Figure 1 shows the optical layout of the device; FIG. 2 is a view of the mask from the illuminator; in fig. 3 shows the block diagram of the electronic unit.

The device consists of an optically coupled source of a parallel beam (illuminator), a collimator 2, a mask 3 made of an opaque material, with holes 4, 5 and 6 of equal area, the size of holes 4 and 5 along the axis, perpendicular to the measuring direction, expressions

01

m

V.,

 And P - 2 2 Yu (

 i FF

V. (1

2 - W

KH

1)

 - 2 where H is the sum of the widths of the holes;

To - set the slope of the transformation f X - coordinate along the axis of the lying

in the plane of the mask,

and photodetectors 7-9, the photoreceivers 7, 8, and 9 being optically connected to the openings 4, 5, and 6, respectively, and the electronic unit 10, made in the form of serially connected operational amplifier 11, whose input is connected to the output of the photoreceiver 9, differential amplifier 12, the second input of which is connected to the output of the photodetector 8, divider 13 and differential amplifier 14, as well as series-connected differential amplifier 15, whose inputs are connected to the outputs of amplifier 11 and the photodetector 7, respectively connected to the second input of divider 13 and divider 16, a second input connected to the output of the amplifier 12, and an output connected to the input of amplifier 14,

The device works as follows.

The shadow image of the object TU is projected onto the holes 4 and 5 of the mas- ter; CI 3. The signals from the photodetectors and 8 are proportional to the area of the holes 4 and 5 that are not covered by the shadow image. The signal from the photodetector 9 depends only on the illumination of the mask 3 and is a reference. The electronic unit 10 processes signals from photodetectors 7, 8 and 91, 1. and Ig in accordance with the algorithm

I li-lls. B. 1 "- 1z L-b

where I is the output signal of block 10.

Then the signal at the output of block 10 is proportional to the value of KU, where U is the measured coordinate.

Claims (1)

Formula formula A device for determining the coordinates of long objects in the production process, containing optically coupled source of a parallel beam, a mask with two variable width openings and three photodetectors, the first and second photoreceivers are optically connected to the first and second openings of the mask, respectively, an amplifier whose input is connected to the output of the third photodetector; and a differential amplifier, the output of which is the output of the device, characterized in that, c. the purpose of increasing the accuracy and expansion of the measurement range, it is equipped with second and third differential amplifiers, the first inputs of which are combined and connected to the output of the amplifier, and the second inputs are connected to the outputs of the first and second photo detectors, respectively, and the two dividers, the first inputs of which are connected to the outputs of the second and third differential amplifiers, respectively, the second inputs are connected, to the outputs of the third and second differential amplifiers, respectively, and the outputs are connected to the inputs of the first a power amplifier, the mask is made with the third hole optically connected with the third photodetector, the areas of all holes of the mask are equal, and the first and second holes are made with widths V and V varying along the axis lying in the plane of the mask, according to the laws | (, 2ICX wg one), H K X the sum of the widths of the holes; slope conversion; coordinate along the axis lying in the mask plane. 12 . gfcri muz.1 7 3 FC1 .2 JSbixod -