SU926532A1 - Automated goniometer - Google Patents

Description

G 5) AUTOMATED GONIOMETER

The invention relates to a measuring technique, namely, to devices for angular measurements, and can be used to measure flat angles and pyramidality of parts with flat reflective surfaces. The goniometer is well-known, containing an object table, a graduated limb and a rotary telescope.}. The drawback of the device is the low accuracy of angle measurement, which is due to the fact that the angle registration is performed visually, as well as the inability to measure pyramidality. Closest to the proposed technical entity is an automated goniometer containing a rotary platform with a ring laser, an autocollimator consisting of a lens and a luminous diaphragm installed in its focal plane and an analyzing diaphragm with a photoreceiver, and an information processing unit whose inputs are connected respectively to the ring laser and the photodetector. The light and analyzing diaphragms are made in the form of two parallel slits parallel to the axis of rotation of the turntable 2. The disadvantage of the device is the impossibility of measuring the pyramid of prisms. The purpose of the invention is to expand the functionality by measuring the pyramidality. This goal is achieved by the fact that in an automated goniometer containing a rotary platform with a ring laser, an autocollimator consisting of a lens and a luminous diaphragm installed in its focal plane and an analyzing diaphragm with a photodetector, and an information processing unit whose inputs are connected to a ring laser and the receiver, the light from the diaphragm is made in the form of two

intersecting or intersecting in its continuation slots lying in planes intersecting the plane of rotation of the turntable, and the aHalizing diaphragm is made in the form of two slots, respectively parallel to the slots of the light of the diaphragm.

FIG. 1 is a block diagram of an automated goniometer; FIG. 2 shows an embodiment of a light diaphragm.

The device comprises a rotary platform 1, on which a ring laser 2 is mounted, an autocollimator 3 with a lens C, a luminous diaphragm 5 and an analyzing diaphragm 6 with a photoreceiver 7, and an information processing unit 8 connected to the photoreceiver 7 and the ring laser 2.

Goniometer works as follows.

When the rotary platform 1 rotates, the autocollimation image of the light of the diaphragm 5 moves in the plane of the analyzing diaphragm 6 so that the intersection point of the glowing lines of the diaphragm 5 intersects the analyzing diaphragm 6 along a certain line. As soon as the point of intersection of the luminous lines coincides with point A (Fig. 2), one of the lines of the image of the luminous diaphragm 5 is aligned with the parallel aperture of the analyzing diaphragm 6 and the photodetector 7 generates an electrical signal that goes to the information processing unit 8. When this pulse arrives at the processing unit 8, the counting of the pulses arriving at it from the output of the ring laser 2 begins.

At the next point in time when the intersection point of the light lines coincides with another point B, the other line of the image of diaphragm 5 coincides with the second slit of the analyzing diaphragm bis of the photodetector 7 another signal arrives at the processing unit 8, stopping the counting of the pulses of the ring laser. The number of these signals is proportional to the angle / 3 of the rotation of platform 1 during the time between pulses from the photodetector, corresponding to points A and B,

From the following relations, we obtain the value of the deviation of the controlled prism

Ch - AR, iiAi-lli: D -., .and.

de SD is the height in the triangle ABC, the segment is proportional to the angular deviation f of the face of the measured prism 9 characterizing pyramidality, AB is the segment proportional to

angle, (Lj angles in triangle ABC,

formed by the intersection of the trajectory with slits of the analyzing diaphragm. Then

r-6-i4jv -tgcLa.

After these measurements have been made for each face of the prism 9, we obtain data on the pyramidality of the prism.

Thus, the implementation of the luminous diaphragm in the form of intersecting slits allows us to expand the field of application of the automated goniometer and apply it to measure the pyramidality of mirror prisms.

Claims (2)

1.Afanasyev V.A. Optical measurements. M., Nedra, 1968, p.43. 2.US patent N 36065 9, cl. G 01 B 11/26, 1977 (prototype).