SU752139A1 - Apparatus for interpolating measuring-transducer signals - Google Patents

Description

one

The invention relates to the measurement of linear and angular dimensions and can be used, for example, in linear and circular measuring transducers of the movement of the working bodies of the NC Staics, as well as coordinate measuring instruments.

A device for interpolation constructed by the compensation circuit comprising a displacement transducer, a compensation transducer, phase detectors, a switch, an amplifier, a motor, a digital angle sensor 1 is known.

The disadvantage of this device is the narrow frequency range of the transform.

The closest technical resolution to the invention is a device for interpol cpp spigalov measuring transducers, containing a two-phase displacement transducer, two spindle amplification module allocation units connected in parallel to it, an adder connected to the output modulator, am selection block units of the signal modulator, amplitude-constant converter the voltage connected by the inputs to the inputs and outputs of the allocation blocks of the signal module, the digital identification block 2.

The disadvantages of such a device are the need for a large number of comparators to provide the necessary accuracy, the complexity of the operational factor and the factor of the cyp.

The purpose of the program is to improve the accuracy of the resolution.

The goal is achieved by the fact that the device is serially connected

10 counting pulse generator, frequency divider, pulse-amplitude modulator, integrator, three comparators, the first of which is connected by inputs to the outputs of the adder and integrator, the second

15 and the third to the corresponding outputs of a two-phase transducer, an inverter connected to the output of the first comparator, three pulse makers, the first of which is keyed to the output of the first comparator, the second to the output of the frequency inverter, two two-input logic And, the first inputs of which are connected to the outputs of the first

25 two pulse shapers, respectively, by an OR OR logic element connected to the outputs of the first two AND logic elements, a trigger, the first input of which is connected to the output of the OR logic element, and the second to the output of the third

pulse generator, inequality block, connected by two inputs to the outputs of the second and third comparators, and output to the second inputs of the first and second logic elements PI, frequency divider with variable division factor, third logic element I, connecting inputs with trigger output and output frequency divider with a variable division factor, a pulse counter, an input connected to the output of a frequency divider with a variable division factor, and an output to a digital display unit.

FIG. 1 is a block diagram of the device; in fig. 2 is a time diagram of the operation of the device.

The device consists of a measuring transducer 1 non-displacement, blocks 2, 3 of the selection of the module of signals, adder 4, comparators 5, 6 and 7, formers 8, 9 and 10 pulses, logic elements 11 11, 12, 13, logic element 14 OR, integrator 15 , amplitude-pulse modulator 16, frequency delntel 17, oscillator 18 counting pulses, inequality block 19, inverter 20, trigger 21, variable frequency splitter 22, variable converter 23, signal ampere — constant voltage, counter 24, and block 25 digital display.

The device works as follows.

The displacement transducer 1 generates two signals of the form of sin X and cos X. These signals come in blocks 2, 3 of the highlight module, and the outputs of which are formed in the form of sin X and cos X are correspondingly.

These expressions are summarized in adder 4 to form a triangular shape, the period of which is two times smaller than the period of the signals of the measuring transformer 1 and the displacements. A counting pulse generator 18 generates a sequence of high frequency pulses (Fig. 2a), from these pulses a frequency divider 22 forms a signal of the square wave type (Fig. 26), which is used to modulate the first input of the amplitude-pulse modulator. The other input of the modulator 16 receives a constant voltage from the converter 23, proportional to the amplitude of the signal of the measuring converter 1 displacement. A change in the amplitude of the signal of the non-displacement measuring transducer 1 causes a proportional change in the constant voltage at the output of the transducer 23 and in turn modulates the meander and the output of the amplitude modulator 16 of the meander. The integrator 15 integrates the output voltage of the transducer.

high frequency (Fig. 40). The amplitude of this triangular voltage is chosen to be equal to the amplitude of the triangular voltage formed from the signals of the measuring transducer 1 displacement at the output of the adder 4.

When the amplitude of the signals at the output of the measuring transducer 1 changes, the displaced one will remain equal

the amplitude values of the triangular voltages at the outputs of the integrator 15 and the adder 4. Both of these triangular voltages are fed to the comparator 5. FIG. 2c shows a high-frequency triangular incidence, the dotted line shows the instantaneous value of the triangular voltage at the output of the adder 4. The equality of the specified voltage comparator 5 operates and generates pulses (Fig. 2g), the duration of which depends on the measured value and does not depend on change the amplitude value of the input signal. An imuls imaging unit 8 generates short pulses (Fig. 2e). The pulse shaper 10 also generates short pulses (Fig. 2 h) along the front edge of the meander with a frequency divider 18.

About the change in the position of the measuring transducer 1 the information displaced in the first quarter of the period is carried by the phase shift between the ohmic pulse (Fig. 2h) and the pulses (Fig. 2e). When finding the measured value in the second quarter of the period, the position information carries

phase shift between the pulse formed by the shaper 9 (Fig. 2 g) and the reference pulse (Fig. 2l).

Thus, the information about the measured value in the hier and the third quarter

The pulses of FIG. 2 e, and in BTOpoii and the fourth quarter of x - FIG. 2 x

To exclude a monotonous count, i.e., to distinguish D1 between all four quarters, block 6, 7,

9, I, 12, 14, 21. At the output of the trigger 13, ultimately, pulses are generated, the duration of which is determined by the phase (temporal location) of short pulses carrying information about the negative CRI of the displacement transducer 1 relative to the reference pulse in the output of the shaper 10 As a nrimer, in FIG. 2 to them are shown the emulsions when the measured magnitude is found in the middle and the second quarter of the correspondence.

The measurement of the duration of this duration is carried out by filling this duration with high frequency pulses with

output divider 22 frequency variable divider ratio. The divider 22 divides the pulses from the geerator 18 count pulses. The division factor of divider 22 determines the interpolation coefficient of the entire device. The number of emulsions under the spot is counted by the counter 24 and is indicated in digital form in block 25. Thus, the intra-step division of the input signal is performed.

Claims (2)

1.Zverev A.Ye., Maksimov V.P., Mnikov V.A. Converters of angular displacements into a digital code. L., “Energie, 1974, p. 76. 2. The patent of Germany L 194520G, cl. 42D 5/00, 1974 (prototype). / g I 7 14 7   / -  I I I i and P I I about p and about  I m --one I g