SU1394036A1 - Device for checking measuring head - Google Patents

Abstract

This invention relates to instrumentation technology. The purpose of the invention is to increase the accuracy of the I / Cfb ...... / I .., .i control by eliminating the inertial errors in the contact of the measuring heads .. To the first input of the electronic processing unit 8 from the output of the first channel 6 of the two-channel interferometric measuring system the signal proportional to the movement of the carriage 2. When the tip 4 of the measuring head 3 touches the stationary stop 5 at the output of the second channel 7 of a two-channel interferometric measuring system, a signal is formed that is constant vol. swarm input processing electronic unit 8 and the count enable pulse counter 15. When the occurrence of the signal at the output of the measuring head 3 is stopped expense pulses. From the output of the counter 15, the indicator 16 receives a quantity of pulses proportional to the measured error. 1 il. eaten

Description

one

The invention relates to instrumentation technology and can be used to test and monitor measuring heads.

The aim of the invention is to increase the accuracy of control by eliminating the inertial errors in the contacting of the measuring heads.

The drawing shows a diagram of the device.

The device comprises a base 1, a carriage 2 connected to the measuring head 3 with a tip 4, a fixed stop 5, the first and second channels 6 and 7 of a two-channel interferometric measuring system electronic processing unit 8 containing the first and second pulse shapers 9 and 10, the frequency divider 11, the first and second triggers 12 and 13, and the circuit 14, the pulse counter 15 and the indicator 16, and the input of the first channel 6 of the two-channel interferometric measuring system is optically coupled to the carriage 2, and the output to the first input of the electron og processing unit 8, the second input of the two-channel Kanli 7 Coy interferometric measurement system optically coupled to the tip 4, and an output - to a second input of the electronic processing unit. In block 8, the first pulse shaper 9, the frequency divider 11, the AND circuit 14 and the pulse counter 15 are connected in series, the output of the second pulse shaper 10 is connected to the first input of installation O of the first trigger 12, the second input of installation O of which is connected to the inputs of installation O of the second trigger 13 and pulse counter 15, the output of the splitter, 11 frequencies are connected to the counting inputs of the first trigger 12 and the second trigger 13, the information input of which is connected to the output of the first trigger 12, and the output to the second input of the circuit AND 14, the output of which is connected A COUNTINUM input of the pulse counter 15, the setup input of which is connected with the output of the measuring head 3, and the output - with the input of the indicator 16,

The device works as follows.

In the initial state of the tip

does not touch the stop 5 and the signal from measuring 1 tin 3 is missing. Beam of the first (m about channel 6 two-channel

ten

15

20

25

0 35

40

45

50

55

The interferometric measuring system is reflected from the carriage 2 and interferes with the reference beam. The beam of the second channel 7 of the two-channel interferometric system is reflected from the tip 4 and interferes with the reference beam. The intensity of the interfered rays of the photodetectors is converted into electrical signals that arrive at the inputs of the electronic unit B of processing. Before the measurement is started, a pulse is applied to the bus O. The pulse is set in the electronic processing unit 8 and resets the pulse counter 15 to zero. Measurement of the response error of the measuring head 3 begins when the carriage 2 moves.

The movements of the carriage 2 and the tip 4 are converted into electrical signals, the period of which corresponds to the movement of the carriage 2. Until the tip 4 contacts the stop 5 from the output of the second channel 7 of the two-channel interferometric measuring system to the second input of the electronic processing unit 8, the signal goes prohibiting the counting of pulses by the counter 15 coming from the driver 9 pulses, the number of which corresponds to the amount of movement of the carriage 2. At the moment when the tip 4 contacts the abutment 5 from the second the channel 7-channel signal enters the interferometric system allowing calculation of pulse counter 15. The pulse-counting continues until until installation on a counter input 15 of the pulse signal is received from the measuring head 3, prohibiting pulse count. The counted number of pulses is transmitted to the indicator 16, at the input of which the idling value of the measuring head is indi vidual.

The electronic processing unit operates as follows.

Signals from the first 6 and second 7 channels of a two-channel interferometric measuring system, fed to the first 9 and second 10 pulse shapers, are converted into short-term pulses. The pulse frequency of the first driver of the pulse generator 9 of the frequency divider 11 decreases, cht (1 to exclude accidental coincidence in time with the pulses of the second driver of the pulse generator 10. The first and second triggers 12 and 13 and the counter 15 pulses before starting measurements are set to position O. The pulses of the first driver 9 At the same time, the signal of the logical 1 from the information input with a delay is copied to the output of the first trigger 12 at the first impulse input of the first 12 and second 13 triggers. The input to the counting input of the second trigger 13, its output state (logical O) does not change due to the delay in the formation of a logical 1 signal at the output of the first trigger 12. The second pulse from the second driver 10 pulses the first trigger 12. In As a result, a logic signal O, which prohibits the passage of pulses to the counter 15 pulses from the frequency divider 11, arrives at the input of the circuit 14 from the second trigger 13.

When the tip 4 of the head 3 is in contact with the fixed stop 5, the signal from the second channel 7 of the two-channel interferometric measuring system ceases to arrive at the input of the second driver 10 pulses. The carriage 2 continues to move. At the input of the installation About the first trigger 12 from the output of the second driver 10, zeroing pulses cease to arrive, and the second pulse from the first driver 9 records the signal of logical 1 from the information input at the output of the second trigger 13. The signal 1 is fed to the second input of the circuit 14, which permits the passage of pulses from the output of the frequency divider 11 to the counting input of the counter 15 pulses.

0

0

Claims (1)

Invention Formula A device for controlling a measuring head, containing a base-a-. a carriage, a two-channel interferometric measuring system, the first channel of which is optically coupled to the carriage, and an electronic processing unit, whose inputs are connected to the first and second channels of a two-channel interferometric measuring system, characterized in that it is provided with a fixed stop arranged on the base intended for interaction with the measuring head optically coupled to the second channel of a two-channel interferometric measuring system, indicator, electronic processing unit, made in the form of serially connected first pulse shaper, frequency divider, AND circuit 5 and the pulse counter, the second pulse driver, the first and second triggers, the output of the second pulse driver is connected to the first one. the input of the zero setting of the first trigger Q pa, the second input of the zero setting of which is connected with the inputs of the zero setting of the second trigger and the pulse counter, the output of the frequency divider is connected to the counting inputs of the first and second triggers, the output of the first trigger is connected with the information input of the second trigger whose output is connected to the second input of the circuit I, the output of which is connected to the counting input of the pulse counter, the setup input of which is intended to communicate with the output of the measuring head, and the output of the pulse counter is connected to the input m indicator, the inputs of the first and second drivers five 0 five pulses are the inputs of an electronic processing unit.