High precision angle-measuring method

Abstract

A high-precision angle measurement method. First, the object to be measured is placed on the rotating platform, and then the 720-tooth indexing table and the 391-tooth indexing table are combined on the rotating platform, and the 720-tooth indexing table and the 391-tooth indexing table are combined Place the plane mirror on the indexing table combination; then adjust the photoelectric autocollimator so that the measuring light emitted by it is aimed at the plane mirror; turn the combination of the 720-tooth indexing table and the 391-tooth indexing table to rotate an angle, and Record the value of the rotation angle at this time, and then reversely rotate the rotary platform so that the measurement light emitted by the photoelectric autocollimator is re-aimed at the same aiming position on the plane mirror. At this time, the 720-tooth indexing table and the 391-tooth indexing table are combined The value of the rotation angle is the angle value of the rotation of the sensitive device to be tested. The method of the invention has simple operation steps and can realize high-precision testing of the whole circle angle.

Description

technical field [0001] The invention relates to an angle measurement method, in particular to a large-scale and high-precision angle measurement method used for assembly and testing of aerospace remote sensors. Background technique [0002] During the installation and adjustment process of aerospace remote sensors, angle tests with a large measurement range are often required, such as system integration tests and internal orientation element tests. Angle test with high precision and large measurement range is one of the indispensable means in the development process of remote sensing cameras. It plays an important role in the process of optical inspection and assembly. Camera) and angle test camera system detection and other links, the angle measurement accuracy directly affects the quality of the camera. With the increasing requirements for the resolution of remote sensors, aerospace remote sensors are developing in the direction of telephoto, which will inevitably make th...

AI Technical Summary

Problems solved by technology

The angle measuring device using this method can generally have a load capacity of 1500kg or more, but its angle measuring accuracy is generally below 1″

For high-precision assembly and testing, the angle measurement accuracy of 1″ can no longer meet the current use requirements. For example, the geometric accuracy calibration of remote sensors requires the angle measurement accuracy to reach 0.4″ or even higher.

At present, the measurement method that can realize the angle measurement accuracy below 0.5 ", such as Cai Shuzhang, Jing Fangsheng, "Photoelectric Autocollimator and Its Application" and "Multi-tooth Indexing Table" published by China Metrology Press in 1986 The measurement method introduced has a small angle measurement range (generally below classification) or a load capacity of less than 100 kg, which cannot meet the requirements of large load and wide range angle measurement.

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