JPH05272979A - Method for setting measurement point in parabola antenna - Google Patents

Abstract

PURPOSE:To set a measurement point efficiently by fixing one edge of a tape measure to a tape measure reference point at the center of a mirror surface, suspending a tape measure case outside the outer edge of the mirror surface, mounting a weight to the tape measure case so that the tape measure tension reaches a prescribed value, and then marking a prescribed straight line distance from the reference point on the mirror surface by holding the tape measure. CONSTITUTION:A tape measure case 4a where one edge of a tape measure 4 is fixed to a tape measure reference point 9 is suspended outside a parabola antenna 1 through a tension device 10 which is provided at an outer edge 1b of a mirror surface and a weight is mounted to the case 4a. By adjusting the weight of the weight 5, tension of the tape measure is adjusted. A spring scale is connected to the reference point 9 before measurement and adjustment is made so that a prescribed tension can be obtained. Simply by suspending the case 4a and the weight 5 externally from an outer edge 1b through the device 10, a worker B reads a prescribe straight line distance d from the tape measure 4 and marks on a mirror surface 1a, thus setting a measurement point 8. Therefore. a certain tension can be applied to the tape measure 4 constantly, thus performing an extremely accurate marking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for setting measuring points on a large parabolic antenna used for satellite communication antennas, radio telescopes and the like.

[0002]

2. Description of the Related Art A large number of measuring points (targets) provided on a mirror surface are used to adjust and measure the mirror surface accuracy of a large parabolic antenna.
Is performed by measuring the depression angle from the water surface with an optical instrument installed at the center of the mirror surface. In addition, the installation of the measurement point,
It is performed by measuring a straight line distance from a tape measure reference point installed with an optical instrument at the center of the mirror surface and marking on the mirror surface with a scribble or a pencil. These measuring points are provided at several hundred to several thousand points depending on the diameter of the antenna. A metal tape (tape measure) is used to measure the linear distance, but the tension applied to the tape measure changes the slack error and extension error of the tape measure, so the tape tension must be kept at a specified value for measurement. ..

A conventional method of setting measurement points on a parabolic antenna will be described with reference to FIG. As shown in the figure, an optical instrument 2 for measuring the depression / elevation angle from a horizontal plane and a tape measure reference point 9 as a reference point of the tape measure 4 are provided at the center of the parabolic antenna 1. After the worker A secures a foothold,
Tape measure case 4 with one end of tape measure 4 fixed to tape measure reference point 9
In order to keep the tension of the tape measure 4 at a prescribed value by holding the spring clasp 7 connected to the tape measuring tape 4a and the tape measure case 4a with both arms, the spring tension 7 is adjusted while adjusting the tension so that the scale of the spring taper 7 shows the prescribed value. I'm pulling. For this work, it is necessary to match the breathing with the worker B, and the worker B sets the measurement point 8 by marking a mark on the mirror surface 1a at the time of the specified tension.

[0004]

However, in the conventional method of setting the measuring points in the parabolic antenna, there is a large error in the tension due to the skill of the worker who pulls the tape measure with a constant tension, the accuracy of the spring backlash, and the like. Person's risk,
There is a problem that the degree of fatigue is high.

The present invention has been made in view of the above point, and eliminates the work involving danger, fatigue, and error, that is, the manual work of pulling a tape measure with a prescribed tension, and setting of a highly accurate measurement point. It is an object of the present invention to provide a method of setting measurement points on a parabolic antenna that can efficiently perform.

[0006]

In order to solve the above-mentioned problems, a method of setting a measurement point on a parabolic antenna according to the present invention is a straight line in the method of setting a measurement point which is a point of mirror surface precision adjustment and measurement of a large parabolic antenna. One end of the tape measure to measure the distance is fixed to the tape measure reference point installed at the center of the mirror surface, the tape measure case is hung outside the outer edge of the mirror surface, and the tape measure tension becomes the specified value on the tape measure case hung outside the outer edge of the mirror surface. Set a measurement point by attaching a weight with such a weight, pressing the tape measure between the tape measure reference point and the outer edge of the mirror surface to read the linear distance from the tape measure reference point, and marking the specified linear distance on the mirror surface. It is characterized by

[0007]

[Function] It is necessary to set a measurement point on the mirror surface for adjusting and measuring the mirror surface accuracy of a large parabolic antenna. One end of the tape measure for measuring the linear distance is fixed to the tape measure reference point installed at the center of the mirror surface. The tape measure case is hung outside the outer edge of the mirror surface, and a constant weight is attached to the tape measure case. The weight of the weight is the weight at which the tension of the tape measure reaches a specified value. The operator holds the tape measure stretched between the tape measure reference point and the outer edge of the mirror surface, reads the specified linear distance from the tape measure reference point, marks this linear distance on the mirror surface of the parabolic antenna, and sets the measurement point. In this way, since the tape measure is always stretched between the tape measure reference point and the outer edge of the mirror surface with the specified tension, it is possible to efficiently set the measurement point with high accuracy.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram illustrating a method of setting measurement points on a parabolic antenna according to the present invention. As shown in the figure, an optical instrument 2 for measuring a depression / elevation angle from a horizontal plane and a tape measure reference point 9 which is a reference point of a tape measure are provided at the center of a parabolic antenna 1. A tape measure case 4a in which one end of the tape measure 4 is fixed to the tape measure reference point 9 is hung outside the parabolic antenna 1 via a tension device 10 provided on the mirror surface outer edge 1b. A weight 5 is attached to the tape measure case 4a.
The tension of the tape measure 4 is adjusted within a specified range by adjusting the weight of the tape. Prior to the measurement, the weight 5 is connected to the tape measure reference point 9 by a spring barr and adjusted so as to have a specified tension.

By simply suspending the tape measure case 4a and the weight 5 from the mirror surface outer edge 1b via the tension device 10, the worker B reads the specified straight line distance d from the tape measure 4 and the mirror surface 1a.
The measurement point 8 is set by marking the top. Therefore, a constant tension can always be applied to the tape measure 4, an operator who pulls the tape measure 4 with a constant tension is not required, and extremely highly accurate marking can be efficiently performed.

FIG. 2 shows a tape measure tension device for applying a specified tension to the tape measure for carrying out the method for setting the measurement points on the parabolic antenna of the present invention. The tape tension device 10 is framed by an angle 12a, an angle 12b and a plate 12c. The pulley 11 is inserted into a shaft 15 provided between the angles 12a. A balancer 14 is attached to the angle 12a to maintain the balance of the tape tension device 10, and the angle 12b hooks the tape tension device 10 on the mirror surface outer edge 1b. Hang the tape measure 4 on the pulley 11 of the tape measure tension device 10,
The weight 5 is hung from the tape measure case 4a so that the tension of the tape measure 4 is kept within a certain specified value. The rope 13 connects the angle 12a and the tape measure case 4a so that the tape measure case 4a does not drop. For the weight 5, a weight (shuckle or the like) at the work site is used, and before the measurement, the spring taper is connected to the tape measure reference point 9 to adjust the tension so that the tension becomes a specified value. Balancer 1
4 can also be used at the work site (wood chips, etc.). The tape measure tension device 10 is merely hooked and placed on the mirror surface outer edge 1b, and can be easily moved by the worker B in the circumferential direction.

[0011]

As described above, according to the method of setting the measuring point on the parabolic antenna according to the present invention, one end of the tape measure for measuring the linear distance is fixed to the tape measure reference point installed in the center of the mirror surface, and the tape measure case is set. A weight having a weight such that the tape measure tension becomes a specified value is attached to the tape measure case that is hung outside the mirror surface outer edge, and the tape measure that is stretched between the tape measure reference point and the mirror surface outer edge is pressed. Since the measurement point is set by reading the linear distance from the tape measure reference point and marking the specified linear distance on the mirror surface, there is no need for dangerous, fatigue, and error-related work, that is, manual work of pulling the tape measure with the specified tension. Therefore, it is possible to efficiently set the measurement point with high accuracy.

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating a method of setting measurement points on a parabolic antenna in one embodiment of the present invention.

FIG. 2 is a tape measure tension device for applying a specified tension to the tape measure for implementing the method for setting the measurement points on the parabolic antenna of the present invention.

FIG. 3 is an explanatory diagram illustrating a method of setting measurement points on a parabolic antenna in a conventional example.

[Explanation of symbols]

 1 Parabolic antenna 1a Mirror surface 1b Mirror outer edge 2 Optical instrument 4 Tape measure 4a Tape measure case 5 Weight 7 Spring barkari 8 Measurement point 9 Tape measure reference point 10 Tension device 11 Pulley 12a Angle 12b Angle 12 Plate 13 Rope 14 Balancer 15 Axis

Claims (1)

[Claims] 1. A method of setting a measuring point which is a point for adjusting the mirror surface accuracy of a large parabolic antenna and for measuring the measuring point, wherein one end of a tape measure for measuring a linear distance is fixed to a tape measure reference point installed in the center of the mirror surface. Is hung outside the outer edge of the mirror surface, and a weight having a weight such that the tape tension is a specified value is attached to the tape measure case hung outside the outer edge of the mirror surface, and the tape measure stretched between the tape measure reference point and the outer edge of the mirror surface is pressed. A method of setting a measurement point on a parabolic antenna, which comprises setting a measurement point by reading a straight line distance from the tape measure reference point and marking a specified straight line distance on a mirror surface.