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Autocollimation angle-measurement method with a large range based on spot deformation
Optics Express
|October 19, 2022
Summary
A new hollow cylindrical cube-corner reflector (HCCCR) enhances autocollimator (AC) angle measurement range. This innovation extends the measurement range to ±30° and improves accuracy for pitch and yaw angles.
Area of Science:
- Optics and Photonics
- Metrology and Measurement Science
Background:
- Autocollimators (AC) are crucial for precise angle measurements.
- Traditional ACs have limitations in measurement range and accuracy.
- Cube-corner reflectors are commonly used in optical systems.
Purpose of the Study:
- To propose a novel hollow cylindrical cube-corner reflector (HCCCR) for autocollimators.
- To enhance the angle measuring range of autocollimators.
- To enable precise measurement of yaw and pitch angles.
Main Methods:
- Utilizing the parallel propagation characteristics of reflected and incident light.
- Analyzing morphological changes of the reflected beam to determine angles.
- Experimental validation of the HCCCR performance.
Main Results:
- Extended the autocollimation angle measurement range from ±30' to ±30°.
- Achieved a dynamic measurement distance of 0.2–5m.
- Obtained measurement accuracy better than 69" for pitch angle and 51" for yaw angle.
Conclusions:
- The proposed HCCCR significantly expands the angle measurement capabilities of autocollimators.
- The HCCCR offers high accuracy for dynamic pitch and yaw angle measurements.
- This reflector is a promising solution for advanced optical metrology applications.
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