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Geometrical analysis of an optical fiber bundle displacement sensor
Applied Optics
|December 15, 2010
Summary
This study enhances optical lever performance by analyzing multifiber designs. Finer fibers with more bundles improve sensitivity and displacement detection limits for precise measurements.
Area of Science:
- Optics and Photonics
- Mechanical Engineering
- Instrumentation
Background:
- Optical levers are crucial for precise displacement sensing.
- Existing models require extension for multifiber configurations.
- Understanding geometric effects on sensitivity is key.
Purpose of the Study:
- To geometrically analyze multifiber optical lever performance.
- To derive generalized relationships for sensitivity and detection limits.
- To investigate the impact of fiber core radius, illumination, and coupling angle.
Main Methods:
- Extended the Cook and Hamm model for a seven-fiber optical lever.
- Analyzed three light source types: parallel beam, infinite plane, and point source.
- Validated point source analysis with a light-emitting diode measurement.
Main Results:
- Sensitivity is inversely proportional to fiber core radius.
- Receiving light power is proportional to the number of fibers.
- Bundling finer fibers increases sensitivity and improves displacement detection.
Conclusions:
- Multifiber optical levers offer enhanced performance.
- Optimizing fiber number and size improves sensitivity and detection limits.
- The findings are applicable to various light source conditions.
