JPS5887405A - Measurement of angle - Google Patents

Abstract

PURPOSE:To measure the center direction of a target by a method wherein light is projected to a spherical target from the light source of a collimator and the reflected light received therewith to coincide with the light projection axis with the light receiving axis. CONSTITUTION:Light is projected to a spherical mirror target 1 placed on the surface of an object 10 to be measured such as reflection mirror surface of an antenna and the reflected light is coincided with the reference line to measure the angle theta of the collimator 2 to the origin O. In this case, if the distance L between the origin O and the measuring point (x, y) and the height H of the collimator 2 from the origin O are known, the relationship therebetween is given by the equations. The position (x, y) of the target can be calculated from the equations.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an angle measurement method for determining a reference angle with respect to an arbitrarily placed target.

Generally, large parabolic antennas with a diameter of 30 m or more are square!
A collimator tube for measurement is used to measure each position of the reflecting mirror surface, and the mirror surface is adjusted. This collimator has a built-in secondary light source that reflects the projected light from the target, projects the reflected light onto a light projector, and adjusts the deviation between the light source and the projected light to zero, thereby adjusting the directivity angle [1- It is up to you to decide.

Conventionally, this angle measurement method used a flat mirror as a target for the collimator, tilted the flat mirror, and determined the reference angle to be the angle at which the reflected light from the flat mirror coincided with the reference line of the collimator. However, this method has the drawback of requiring time and effort as the target's position changes and the target's mirror must be rotated vertically and horizontally.

SUMMARY OF THE INVENTION An object of the present invention is to provide an angle measurement method that eliminates the drawbacks of conventional methods, allows easy measurement by adjusting the target, and reduces measurement time and labor.

In the angle measuring method of the present invention, a target having a spherical reflecting mirror is installed at the location to be measured, light is projected from a light source of a collimator toward the spherical target, and the projected light is reflected from the mirror surface of the spherical target. The center direction of the spherical target is measured by receiving the reflected light with the collimator and aligning the light receiving axis with the light emitting axis in the collimator.

In this invention, if the measurement target point is aligned with the spherical center of the spherical target, the light incident perpendicularly to the convex spherical surface will be
It is reflected by that mirror surface and the incident optical path is redirected!
A projector with a projection light detection function searches for this light, and the reference angle of the projector at the detection point becomes the azimuth and elevation angle of the target.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a block diagram illustrating the invention in detail. In other words, the collimator 2 projects light onto a spherical mirror target l placed on the surface of the object to be measured 100, such as the reflecting mirror surface of an antenna, and the reflected light from the target 1 is made to coincide with the reference line. This is to measure the angle # from the origin 0 of the collimator.

In this case, if the distance @L between the origin 0 and the measurement point (xmy) and the height H of the collimator 2 from the origin 0 are known, these relationships can be expressed as in the following equation.

Z! 4y2==l! x=(H−y)tanθ From these equations, the target position (x, y)t″ can be calculated.

FIG. 2 is an explanatory diagram of another embodiment of the present invention, in which two projecting collimators 2. The angles α and β of target 1 from 3 and the collision of the two cars ≠−Y2,
A case in which the target position is determined from a distance H between 3 and 3 is shown in FIG. That is, these relationships are expressed as in the following equation.

Here, the height of collimator 3 is tyl, and Y'=Y-1y
1.

1=tanβ y′ H−y′ By substituting the height H1 angle α, / into these equations, the target position (xmy)v can be calculated.

According to this invention, not only does it eliminate wasted time and effort in adjusting the target, but it also eliminates the need to actually measure the distance to the target position, so it can be easily deformed like a large antenna. Measurements can be made simply by placing the target on a flexible object.

[Brief explanation of drawings]

FIGS. 1 and 2 are block diagrams for explaining the first and second embodiments of the present invention. In FIG.・Collimator, 10・
...It is an object to be measured. Agent Patent Attorney Oto Uchihara 6 / Diagram

Claims (1)

[Claims] A target with a spherical reflective mirror is set at the location to be measured, a light source of a collimator emits light toward the spherical target, and the reflected light of the projected light from the mirror surface of the spherical target is received by the collimator. An angle measuring method characterized in that the direction of the center of the target is measured by aligning the light receiving axis and the light emitting axis in the collimator.