SU1585679A2 - Photoelectric transducer of displacements - Google Patents

Abstract

The invention relates to measuring technique. The aim of the invention is to improve the accuracy and speed of the Converter by automating the measurement process. The converter has an angular displacement recorder, vertical and horizontal displacement channels, whose electronic circuits are interconnected, thereby taking into account the effect of angular displacement on vertical and horizontal and vertical displacement on horizontal displacement. Horizontal movement has no effect on others, based on the geometry of the windows in the mask. 4 il.

Description

The invention relates to instrumentation engineering and can be used to monitor, indicate, and measure the movements of various controlled objects.

The purpose of the invention is to improve the accuracy and speed of the transducer by automating the measurement process.

FIG. 1 shows a converter block diagram; in fig. 2 and 3 - a shadow mask in the initial and working positions; in fig. 4 - potential distribution along the - resistive layer.

The photoelectric transducer of displacements contains a light source 1 sequentially installed along the light beam shadow mask 2, rigidly connected with the object of control and having two equal-sized transparent windows, and phototouchnometer 3 with power source 4. Resistive

layer 5 of photopotentiometer 3 has terminals at the ends connected to one source 4 terminal, middle terminal 6 and pins 7 and 8 symmetrically located relative to it. Photoconductive 9 and collector tO layers of photopotentiometer 3 are separated along the transverse axis by a dielectric layer 11, Both parts the collector layer 10 have one output 12 and 13 each. The middle output 6 through the meter 14 of the angular movement recorder is connected to the second terminal of the source 4, the angular movement recorder also contains the first amplifiers connected in series Tel 15, the first comparing unit 16, dividing unit 17, serially connected second amplifier 18 and a second comparing unit 19, whose output is connected to the second input of the unit 17 dividing. Pins 12 and 13 are connected to the channel of the registration of vertical displacements,

SP

00 01 SP)

with

Yu

31

containing the third amplifier 20, the output of which through the first multiplication unit 21 is connected to the third comparison unit 22, and the fourth amplifier 23, the output of which is connected to the second input of the comparison unit 22, the output of the division unit 17 is connected to the second input of the multiplication unit 21. Pins 6 and 7 are connected to a horizontal displacement recording channel comprising a fifth amplifier 24 and a fourth comparing unit 25 connected in series, the second multiplying unit 26,. the adder 27 and the sixth amplifier 28. The mask 2 is located in a ramp, perpendicular to the optical axis of the light source 1, and has windows whose points of the same name are symmetrical about the optical axis of the source 1, and their sections parallel to the axis of sensitivity of the photo potentiometer 3 change monotonically . The output of dividing unit 17, adder 27 and comparison unit 26 are the first, second and third outputs of the converter, respectively.

The Converter operates as follows (see Fig. 1).

The beam of light from the source 1 through the transparent windows of the mask 2 falls on the photopotentiometer 3. At the same time, the lighted areas of the photoconductive layer 9, the resistance of which becomes negligibly small, are shunted through the corresponding areas of the counting. The lecture layer 10, whose resistance is also negligible, is located above them in the resistive layer 5. In the initial state (see Fig. 2) the origin of the coordinate system O .. shadow mask 2 and the beginning of the coordinate system OXY of the photo potentiometer lie on the optical axis source 1. At the same time, the potential distribution on the resistive layer 5 (the length of which is equal to 2a) has the form represented by the dashed line in FIG. 4. Pins 7 and 8, located at distance b from middle pin 6, have equal potentials and the voltage between them is zero, which indicates that there is no movement along the Y axis. Potentials of pins 12 and 13 correspond to horizontal sections of the potential distribution graph FIG. 4, are also equal, which determines the zero voltage between them, indicating a lack of

o

five

the movement along the X axis. The current meter 14 thus determines a certain value corresponding to a zero displacement along the angle 6. There are zero signals on all three outputs of the converter. When moving the object under test together with mask 2 on the X axis on X, on the Y axis on 4Y, and at an angle of 0 around the optical axis of the light source 1, the position of the mask 2 relative to the coordinate system 03JY is as shown in FIG. 3. The potential distribution of the resistive layer 5 corresponding to this position is shown in FIG. 4; the solid line. The voltage between terminals 7 and 8 is determined by the expression

UY

q,. c,) „

e 4 (a - 1) (a - Ij

(one)

where and is the voltage of the power source 4.

The voltage between pins 12 and 13 is determined by the extrusion

„,. ,,. ,,. УМС9Ыа, и) ГС |, й-1.Д

(2)

The value of the current flowing through the meter 14:

 t U-L2a - (lj - iiU K (a - 1,) (a - Ij)

(3)

where K is a coefficient characterizing the resistance of a section of a unit length of the resistive layer 5. Taking into account the shape and size of the windows of the mask 2 (Fig. 2), the location of the OHC bases and (Fig. 3), the smallness of the displacements 4X4X and 0 and, neglecting the second pore For smallness, write approximate expressions:

K, + 2K, / 1Y +

K, 0

TO.

-

+ Klv

(four)

OH OHD

/ lY - Kj0

K + LH - Kj, K -aX-K JY-

Where

about "x" "- Ov, x

 - o „x

tg i

OmH ,, „- ь

OM,) K., (O

 M 4M

 Hzm)

Oh

 Ohm x

 m lelch;

five

K, K,

Substituting expressions (4) into (1) - (3), determine the desired displacement values. Scientific research institute

, i /

К-Кз1 К, о Uv - К,

(five)

(6)

4X

KtiUx to ,, and, 0

to „to

+ to

,, where K 2 (a - K,);

(7)

), e-585679- 6

the signal of angular displacement is formed according to the expression (5), for example -. UY from pins 7 and 8 is amplified in amplifiers 28 and 24, respectively, in K and K is knotted by tat compared to

in block 26, at the output of which the form-IQ, the signal of movement of gZU is measured according to expression (6). The voltage Uj from pins 12 and 13 increases in amplification

, times, the signal K, U um- 0 in block 25 and the result signal K UY

x 20 and 23 in K „and K., once with

 ti

15

20

responsibly. The signal multiplies - 21 by signal 6 and сrav-L25

 in block 21, the signal is trimmed in block 22 with a signal K. The result of the comparison is sent to the second input of the adder 27 with a unit coefficient, the first and third inputs of which receive signals JY (with a coefficient (1: 1 and 1). (with a coefficient at the input K). Thus, at the output of the adder 27 a displacement signal is formed according to the expression (7),

Claims (1)

Invention Formula TO P (a - 2aK) 2i Ta + k7) The value of the current 1 output of the meter 14 in the form of an electrical signal is fed to the inputs of amplifiers 15 and 18, the gains of which are K. and Kg, respectively. The amplified signals are compared in blocks 16 and 14 of comparison with threshold signals equal to-K and Kg. The comparison results are divided into each other in the block. 17, the output of which Photoelectric converter 30 moves on auth. St. 1043491, characterized in that, in order to improve accuracy and speed by automating the measurement process, it is provided with a channel J-registrations of vertical displacements and a channel of registration of horizontal displacements, the angular displacement recorder is made in series of the first amplifiers of the first comparison unit and the division unit and the second amplifier and the second comparison unit connected in series, the output of which is connected to the second input of the division unit, channel 5, the registration of vertical displacements is made in the form of a third amplifier connected in series, a first multiplication unit and a third comparison unit and a fourth amplifier; output 0 of which is connected to the second input of the third comparison unit, the recording channel of physical movements is made in the form of serially connected fifth amplifier, second 5 multiplication unit, fourth comparator unit and adder and sixth amplifier whose output is connected to the second input of the fourth comparator unit, output current meter connected To the inputs of the first and second amplifiers, the first and second symmetrical outputs of the resistive layer are connected respectively to the first and second inputs of the fourth and third amplifiers, the outputs of the first and second parts of the collector layer of the photopotentiometer are connected respectively to the first and second inputs of the fifth and sixth Xirt  (" Fi9.2 amplifiers, the output of the division unit is connected to the second inputs of the first and second multiplication units and the adder and is the first output of the converter, the output of the third comparison unit is the second output of the converter and connected to the third input of the adder, the output of which is the third output of the converter. Xi Chl Fig.Z