SU830475A1 - Photoelectric displasement-to-signal phase shift converter - Google Patents

Description

I

A photoelectric transducer for moving to a phase shift of a signal relates to instrument making and can be applied in systems of automatic regulation and control.

A photoelectric converter of displacement into a code containing a photoelectric raster sensor, two differential amplifiers, two summation-subtracting units, four shaping units and a pulse shaping unit, which transforms into a phase shift and then into a code, is known.

The disadvantage of this converter is low accuracy due to the presence of a dynamic error in converting the displacement into a phase shift of the signal.

Known photoelectric converter displacement-phase containing a photoelectric raster sensor, which includes

A DIODE light source connected to a constant aprin source, a collimation lens, a moving and stationary raster, four photodetectors, spaced9 shifted relative to each other by 1/4 of the raster step, and an electronic unit that includes two differential amplifiers, to the inputs of which are pairwise tipo- photosensors, a reference frequency generator, two multipliers, are connected to tivophase, to the first inputs of which are connected the outputs of differential amplifiers, and to the second - to the output of the reference frequency generator, and to phase shifting circuit 2.

The disadvantage of this converter is low accuracy due to the presence of dynamic phase error.

The purpose of the invention is to improve the accuracy of the converter by eliminating the influence of the parasitic component in the output signal.

The goal is achieved by the fact that a photoelectric transducer translates into a phase shift of a signal containing a photoelectric raster sensor, the outputs of which are connected to the inputs of differential amplifiers, the outputs of which are connected to the first inputs of multipliers, and a generator, a phase splitter and subtractive device are inserted, and the generator output is connected to the input of the phase shifter, the outputs of which are connected to the second inputs of the multipliers, the outputs of which are connected to the inputs of the calculating device

The drawing shows a diagram of a photoelectric converter for shifting a signal to a phase shift.

The converter contains a raster sensor 1, two differential amplifiers 2 and 3, two multipliers 4 and 5, a reference frequency generator 6, a phase splitter 7 and a subtraction device 8. The photoelectric transducers for moving to phase shift work as follows.

When the shaft of the raster sensor 1 is rotated, four outputs of phase equal to P / 2 signals of equal amplitude AND, AND, AND, AND are formed at its outputs, which are received in opposite phase to the inputs of differential amplifiers 2 and 3, at the outputs of which lijg- and , arriving at the first inputs of multipliers 4 and 5.

A sinusoidal signal of the reference frequency from the generator 6 of the reference frequency is fed to the input of the phase splitter 7, from the outputs of which two sinusoidal waves are taken. phase shiftings of 90, respectively, which are fed to the second inputs of multipliers 4 and 5. At the output of multipliers 4 and 5, signals I.i., Hg are generated, proportional respectively to the product of sines and cosines of the phase shift corresponding to the measured displacement and phase shift the reference signal does not contain a parasitic dynamic component. Consequently, there is no parasitic dynamic component in the output signal of the converter and the converter has an increased dynamic accuracy.

The economic effect of the use of this invention is due to its technical features given above.

Claims (2)

1. USSR author's certificate number 604020, cl. G 08 C 9/06, 1976. 2. USSR author's certificate number 623103 ,. cl. G 08 C 9/00, 19 & 7. (prototype). ABOUT, T at B 0s