SU1286898A1 - Photoelectric method of checking non-rectilinearity and photoelectric device for checking non-rectilinearity - Google Patents

Abstract

1. The photoelectric method of controlling the non-linearity, which means that a parallel beam of rays is divided into two beams that are mirror-symmetric about the optical axis of the main beam, are focused, the angular positions of the beams are measured, and the deviations from the linearity are measured by these differences angular positions, characterized in that, in order to improve accuracy, before focusing, both beams are simultaneously modulated, each with a frequency differing by at least an order from the modulation frequency of the other beam, and inrush both beams to an electrical signal. c & (L

Description

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2. A photovoltaicity control device, containing a collimator, a carriage with a beam-splitting unit, a reflector freely suspended above the beam-splitting unit at an angle of 45 ° to the optical axis of the collimator, an objective lens, a coordinate photoreceiver, a comparison unit and two amplifiers electrically mounted on the guides being controlled; associated with a comparator unit, characterized in that, in order to increase accuracy, it is provided

Two modulators with modulation frequencies differing at least in order from the modulation frequency of the other beam; the beam splitting unit is made in the form of a truncated Schmidt prism with a translucent coating on one of the catheter faces and with a groove perpendicular to the plane of the other face. , one of the modulators is installed inside the collimator, and the other in the slot of the beam-splitting unit in the path of the beam of rays passing through it.

The invention relates to a measurement technique and can be used to control the linearity of the guides during high-precision measurement of small angular movements of objects.

The purpose of the invention is to increase the control accuracy by eliminating errors caused by the turbulence of the radiation propagation medium between the carriage and the objective.

The drawing shows a diagram of the proposed device.

The device contains a collimator 2, a carriage 3 with a light-spreading unit 4, a reflector 5 freely suspended above the beam-splitting unit 4 at an angle of 45 ° to the optical axis of the collimator 2, a lens 6, two modulators 7 and 8 with modulation frequencies that differ by at least an order from the modulation frequency of the other beam, one of the modulators (7) is installed inside the collimator 2, the other (8) is in the groove of the beam splitter 4 in the path of the beam of rays, through it, coordinate photo emnik 9, the two amplifiers 10 and 11 are electrically bonded to the comparison unit U2, and a carriage 13 adapted for positioning the optical elements.

The device works as follows.

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A parallel beam of rays from the collimator 2 falls on the reflector 5 and, reflecting from it, hits the beam splitting unit 4, while the beam of rays is modulated with the frequency fi modulator 7.

The beam of rays incident on the beam-splitting unit 4 is divided by this unit into two beams that are mirror-symmetric about the axis, and the beams are simultaneously modulated with frequencies fj and fj that differ by at least one order of magnitude. Then both beams are focused into the plane of the coordinate photodetector 9. The signals of amplifiers 10 and 11 tuned to frequencies fj and f are proportional to the angular deviations of Ldi c, (-m are the angular deviations caused only by the turbulence of the propagation medium of the radiation between the carriage 13 and the objective b , and di, where m is the angular deviation caused by the action of the turbulence of the propagation medium between the beam-splitting unit 4 and the lens, the angular deviation of the carriage 13. The signal from the output of the comparison unit 12 is equal to the difference of the signals taken from the output The amplifiers 10 and 11 are proportional only to the non-linearity of the monitored guides 1 and does not depend on the turbulence of the propagation medium between the carriage 13 and the objective 6.

Claims (2)

PHOTOELECTRIC METHOD FOR CONTRAINDICITY CONTROL AND PHOTOELECTRIC DEVICE FOR CONTINUITY CONTROL (57) 1. The photovoltaic method for controlling the non-linearity, consisting in the fact that a parallel beam of rays is divided into two beams, the angles of the fundamental axis are angled with respect to the from straightness is judged by the difference of these angular positions, characterized in that, in order to improve accuracy, both beams of the module are simultaneously focused before focusing ruyut each with a frequency that differs by at least an order different from the frequency modulation of the beam, both beams and converts into an electrical signal. SU „„ 1286898 2. A photoelectric linearity control device comprising a collimator sequentially mounted on controlled guides, a carriage with a beam splitter, a reflector freely suspended above the beam splitter at an angle of 45 ° to the optical axis of the collimator, a lens, a coordinate photodetector, a comparison unit, and two amplifiers electrically connected to a comparison unit, characterized in that, in order to improve accuracy, it is equipped with two modulators with modulation frequencies that differ at least by the order of the modulation frequency of another beam, the beam splitting unit is made in the form of a truncated Schmidt prism with a translucent coating on one of the leg faces and with a groove perpendicular to the plane of the other face, one of the modulators is installed inside the collimator, and the other in the groove of the beam splitter block on the beam path rays passing through it.