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Using a Hexagonal Mirror for Varying Light Intensity in the Measurement of Small-Angle Variation.

Meng-Chang Hsieh¹, Jiun-You Lin², Chia-Ou Chang^3,4

¹Institute of Applied Mechanics, National Taiwan University, No. 1, Sec. 4 Roosevelt Road, Taipei 10617, Taiwan. jang1985@msn.com.

Sensors (Basel, Switzerland)

|August 19, 2016

Summary

This summary is machine-generated.

This study introduces a novel optical mechanism for precise small-angle measurement using light intensity variations. The method achieves high resolution and sensitivity, crucial for industrial precision fabrication.

Keywords:

Gaussian beam hexagonal mirror laser beam shifter small angle

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Area of Science:

Optical Engineering
Metrology
Industrial Instrumentation

Background:

Precision positioning and control are vital for industrial processing machines.
Accurate measurement of small-angle variations is essential for high-precision component fabrication.

Purpose of the Study:

To develop a new, simple optical mechanism for measuring small-angle variations.
To utilize light intensity variation for accurate angle measurement.

Main Methods:

A He-Ne laser beam was directed through an attenuator and beam splitter.
Transmitted light interacted with a custom hexagonal mirror, undergoing four reflections.
Rotational changes in the mirror caused parallel shifts in the laser beam, altering detected light intensity.

Main Results:

The variation in detected light intensity directly correlates with small-angle variations.
Achieved resolution of 3 × 10⁻⁴° and sensitivity of 4 mW/° for a 0.6° range.
Achieved resolution of 9.3 × 10⁻⁵° and sensitivity of 13 mW/° for a 0.25° range.

Conclusions:

The proposed optical mechanism effectively measures small-angle variations.
The method demonstrates feasibility and offers high resolution and sensitivity for precision applications.
This technique is suitable for industrial use requiring accurate angle metrology.