JPH0359409A - Parabolic surface shape measuring instrument - Google Patents

Abstract

PURPOSE:To easily measure the shape of a parabolic surface even if the shape changes by measuring the shape of the parabolic surface by trigonometry which uses laser light. CONSTITUTION:A parabolic antenna reflecting plate 1 is mounted on a set base 2 with its parabolic surface up so that its center axis 5 is vertical. Then the parabolic surface is irradiated with laser light horizontally from a laser 3 and a laser moving mechanism 4 moves the laser 3 in the direction of the center axis 5. In the plane which contains the axis of the laser light from the laser 3 and the center axis 5, a photodetector 6 photodetects the laser light which is reflected by the parabolic surface of the reflecting plate 1. Then a reflected light position measuring mechanism 7 moves the reflected light position in the plane in two horizontal and vertical axis directions and the position of the photodetector 6 which receives the laser light is measured. A rotary mechanism 8 rotates the laser 3, mechanism 4, photodetector 6, and mechanism 7 around the center axis 5 and a central processor 9 measures the shape of the parabolic surface by trigonometry to measure the shape of the object parabolic surface even if the shape changes.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a parabolic shape measuring device, and more particularly to a parabolic shape measuring device that can be applied to measuring the shape of a reflecting surface of a parabolic antenna.

[Conventional technology]

The reflective surface of a parabolic antenna usually has a parabolic shape, but if it deviates from the parabolic shape, the antenna will not be able to achieve its intended performance. The shape of the surface is measured to check whether it is a paraboloid.

Conventional parabolic shape measuring devices measure multiple electric micrometers on a parabolic curve that is theoretically strong in the direction that hits the parabolic surface within a plane that includes the central axis of the parabolic surface of the object to be measured. A measuring jig placed at the position, a jig moving mechanism that moves the measuring jig in the direction of the central axis of the paraboloid, and a rotating mechanism that rotates the measuring jig about the central axis of the paraboloid. The precepts include:

FIG. 3 is a configuration explanatory diagram showing an example of a conventional parabolic shape measuring device.

As shown in FIG. 3, the parabolic antenna reflector 31, which is the object to be measured, is placed on a set table 32 with the measurement surface facing upward and the center axis 33 of the paraboloid being vertical. The electric micrometer 34 is connected to the parabolic antenna reflector 31
On the outside of a half-moon-shaped measurement jig 35 whose outer shape matches the shape of They are placed at right angles and facing outward. This measurement jig 35 is moved by a jig moving mechanism 36, and the electric micrometer 34 is applied to the parabolic antenna reflector 31 to read the value, and the theoretical parabolic curve is corrected to obtain the measurement curve. . The parabolic shape of the parabolic antenna reflector 31 was measured by performing this operation at a plurality of rotational positions by rotating the measurement jig 35 using the rotating mechanism 37.

[Problem to be solved by the invention]

In the conventional parabolic shape measuring device described above, the electric micrometer is placed along the parabolic curve, so setting it up is difficult, and it is difficult to set it up if the size or shape of the paraboloid to be measured changes. However, this method has the disadvantage that a new measuring jig is required.

Further, the conventional parabolic shape measuring device has the disadvantage that the measurement results are discrete because the electric micrometers cannot be arranged continuously.

[Means to solve the problem]

The paraboloidal shape measuring device of the present invention includes a laser beam that irradiates the paraboloid with a laser beam located within a plane including the central axis of the paraboloid of an object to be measured and at a predetermined angle with the central axis. Irradiator (
(hereinafter referred to as a laser); a laser moving mechanism that moves the laser in the direction of the central axis within the plane; and a laser moving mechanism located within the plane that receives laser light emitted from the laser and reflected by the paraboloid. a light receiver, a reflected light position measuring mechanism (hereinafter referred to as RM mechanism) that moves the light receiver within the plane and measures the position where the light receiver receives the laser beam; the laser; the laser moving mechanism; the light receiver;
The RM mechanism includes a rotation mechanism that rotates the RM mechanisms together about the central axis as a rotation axis.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration explanatory diagram showing an embodiment of the parabolic shape measuring device of the present invention.

The parabolic shape measuring device shown in FIG. 1 includes a set table 2 that is installed with the parabolic surface for measuring a parabolic antenna reflector 1, which is an object to be measured, facing upward and its central axis 5 being vertical;
A laser 3 that is located on the central axis 5 of the installed parabolic antenna reflector 1 and irradiates a laser beam in a horizontal direction with respect to the paraboloid, and a laser moving mechanism 4 that moves the laser 3 in the direction of the central axis 5. , a light receiver 6 that is located within a plane including the axis of the laser light emitted from the laser 3 and the central axis 5 and receives the laser light reflected by the paraboloid of the parabolic antenna reflector l.
and the receiver 6 in two axes, horizontal and vertical, within that plane.
RM41] which has a stage that moves the laser beam and measures the position where the light receiver 6 receives the laser beam; and the laser beam 3.
Laser moving mechanism 4. Photoreceiver6. A rotation mechanism 8 that collectively rotates the RM machine side 7 about the central axis 5, and a central processing unit (hereinafter referred to as CPU) 9 that controls each of these mechanisms and determines the shape of the paraboloid by triangulation. It is composed of:

FIG. 2 is a principle explanatory diagram for explaining the principle of this embodiment.

As shown in Figure 2, with the horizontal direction as the X axis and the vertical direction as the y axis, the bottom of the paraboloid to be measured is the origin (x, y
) determine the coordinate system. At this time, the point P (x, y) where the laser beam hits the paraboloid of the parabolic antenna reflector 1, and the point where the receiver 6 receives the reflected laser beam are PD (X, 3/).
, let the coordinates of the laser 3 be D(x,y).

Then, the laser 3 is moved to the LD (
0,h) and irradiate the laser beam in the X-axis direction. The laser beam is reflected at the point P (x, y) on the paraboloid,
The axis of the reflected light is inclined at an angle θ with respect to the y-axis. RM machine side 7 is
First, the light receiver 6 is moved to the position (0, h), then the light receiver 6 is moved in the X-axis direction, the X coordinate D1 of the position where the light receiver 6 receives the laser beam is measured, and the data is sent to the CPU 9. send.

Next, move the light receiver 6 by a certain distance i%id in the y-axis direction, move the light receiver 6 again in the X-axis direction, and measure the X coordinate D2 of the position where the light receiver 6 receives the laser beam again. Then, CP
Send data to U9.

Therefore, the CPU 9 determines the coordinates of the measurement point P (x, y) from the known data h, H, d and the data D, , D2 measured by the RM machine side 7. At this time, X and y are X=l)l (1/d)(Hh)(D2 DI)
y = I-1.

Furthermore, the coordinates of P (x, y) are determined by the laser moving mechanism 4 without changing h, and the shape of the parabola is measured.

By repeating the above operations while rotating each mechanism using the rotating mechanism 8, the parabolic shape of the parabolic antenna reflector l can be measured.

〔Effect of the invention〕

The paraboloid shape measuring device of the present invention uses a triangulation method using laser light to measure the difference from a theoretical paraboloid using an electric micrometer.
It is easy to set up, can be measured even if the size and shape of the paraboloid to be measured changes, and has the advantage that continuous measurement results can be easily obtained.

[Brief explanation of drawings]

Fig. 1 is a configuration explanatory diagram showing one implementation of the parabolic shape measuring device of the present invention, Fig. 2 is a principle explanatory diagram for explaining the principle of this embodiment, and Fig. 3 is a conventional parabolic shape measuring device. FIG. 1 is a configuration explanatory diagram showing an example of a shape measuring device. 1... Parabolic antenna reflector, 2... Set stand,
3... Laser, 4... Laser moving mechanism, 5... Central axis, 6... Light receiver, 7... RM mechanism, 8... Rotating mechanism, 9... CPU, 31... ...Parabola antenna reflector, 32...Set stand, 33...Center axis, 34
...Electric micrometer, 35...Measuring jig, 36
... Jig moving mechanism, 37... Rotating mechanism.

Claims (1)

[Claims] a laser beam irradiator (hereinafter referred to as a laser) that is located within a plane including a central axis of the paraboloid of the object to be measured and irradiates the paraboloid with a laser beam at a predetermined angle with the central axis; a laser moving mechanism that moves the laser in the direction of the central axis within a plane; a light receiver that is located within the plane and receives laser light emitted from the laser and reflected by the paraboloid; a reflected light position measuring mechanism that moves within the plane to measure the position where the light receiver receives the laser beam;
Parabolic shape measurement characterized by comprising: a rotation mechanism (hereinafter referred to as an RM mechanism); and a rotation mechanism that collectively rotates the laser, the laser movement mechanism, the light receiver, and the RM mechanism about the central axis as a rotation axis. Device.