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Optical fiber sensor for small angle and infinite angle detection.

Tao Lü¹, Xianli Lang, Yanling Han

¹School of Mathematics and Physics, China University of Geosciences, Wuhan 430074, People's Republic of China.

The Review of Scientific Instruments

|June 3, 2008

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This study presents a novel optical fiber angle sensor capable of simultaneously measuring small and infinite angles with high resolution. The sensor utilizes a cam, attenuators, and a Fabry-Perot cavity for precise angular displacement detection.

Area of Science:

Photonics and Optical Sensing
Instrumentation and Measurement

Background:

Accurate angle measurement is crucial in various scientific and industrial applications.
Existing angle sensors may face limitations in resolution, range, or simultaneous measurement capabilities.

Purpose of the Study:

To develop and demonstrate a novel optical fiber angle sensor.
To achieve simultaneous measurement of small and infinite angles with high resolution.

Main Methods:

The sensor employs a cam mechanism to convert angular rotation into linear displacement.
Linear displacement attenuators modulate a sensitive Fabry-Perot cavity (FPC).
Interferometric fringe counting is used for angle measurement.

Main Results:

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Last Updated: Jul 4, 2026

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The sensor successfully measures both small and infinite angles with high resolution.
Experimental results demonstrate resolutions of 0.5 arcseconds and 1.5 arcseconds.
Achieved angular measurement ranges of 0.1944 degrees and 3.5496 degrees.

Conclusions:

The developed optical fiber angle sensor offers a promising solution for precise angular measurements.
The system's ability to measure across a wide range of angles with high resolution is a significant advancement.