SU528778A1 - Pulse Converter for Laser Displacement Meter - Google Patents

Description

The invention relates to the field of technical physics and can be used in precision instruments for angular or linear displacements.

Currently, the most accurate measurements of movement are made with interferometers comparing the measured value with the laser wavelength, which is determined with a high degree of accuracy.

Measuring devices based on a dual-frequency laser are more reliable and easier to implement.

Laser displacement meters consist of a laser interferometric sensor and an electronic processing unit. The background of the electronic processing unit is a pulse converter that counts the difference in the number of pulses received at its inputs and multiplies this difference by a constant coefficient proportional to the wavelength of the laser used.

This transducer has good resolution and speed, but to obtain measurement results in metric form requires a complex circuit implementation.

The purpose of the invention is to simplify the measurement result in a metric form.

This goal is achieved in that the frequency divider is made in the form of a spreading converter with a division factor proportional to the ratio of the selected metric unit to the laser wavelength, and the arithmetic unit is made in the form of a static register.

The drawing depicted: Ena the structure of a numerical-analogue converter.

The inputs of the two-channel divider / frequency, which are the inputs of the pulse-counting converter, are connected to the outputs of the laser-interferometric photoconverters (not shown in the drawing). The outputs of the dual channel divider / clock are connected to the inputs of blocks 2 and 3 of coarse and precise readings, the outputs of which are connected to the inputs of the arithmetic unit 4.

Pulse converter operates as follows.

The signals of the reference and information frequencies from the outputs of the photoconverters of the interferometric sensor, the phase difference of the QSTs is proportional to the movement of the information reflector of the interferometric sensor, are fed to the inputs of a two-channel divider / frequency with a ratio of 2-10 and

PIA .V

0

X

where is the integer part of the number;

n is an integer (selected depending on the required rate of information output with the output of a pulse-counting converter, and may be, for example, minus one;

I am the laser wavelength.

The signals of the divided frequency arrive at the inputs of the coarse-reference unit 2, which gives the modulus of the difference in the number of pulses arriving at its input, i.e., measured to the accuracy of the movement of the information reflector.

For measuring the displacement with greater than accuracy, the exact reading unit 3 is used. The exact readout unit 3 measures the time interval between the signals arriving at its input from the outputs of both channels of the divider / frequency nute.m of the counting of quantizing frequency pulses that fill this interval.

The codes for moving from the output of block 3 of exact counting and from the output of block 2 g} of counting go to the inputs of the arithmetic unit, which is executed as a static register.

Claims (1)

Invention Formula A pulse converter for a laser displacement meter containing a two-channel frequency divider, a coarse counting unit whose input is connected to the output of a frequency divider, a precision counting unit whose input is connected to the input of the coarse counting unit, and an arithmetic unit connected to these blocks, differing in that, in order to simplify obtaining the result in metric form, the frequency divider is made in the form of a scale stabilizing converter with a coefficient de. laziness is proportional to the reading of the selected metric unit to the laser wavelength, and the arithmetic unit is made in the form of a static register. L,.,. h L