Phase-contrast enhancements to a speckle-based fiber optic sensor

Peter L. Fuhr

doi:10.1117/12.285599

2 September 1997 Phase-contrast enhancements to a speckle-based fiber optic sensor

Peter L. Fuhr

Proceedings Volume 3180, Third Pacific Northwest Fiber Optic Sensor Workshop; (1997) https://doi.org/10.1117/12.285599
Event: Third Pacific Northwest Fiber Optic Sensor Workshop, 1997, Troutdale, OR, United States

Abstract

Speckle based fiber optic sensors have been developed and used in laboratory and field settings for a number of years. In the case of speckle-based fiber optic vibration sensor, optical signal processing of the field emerging form a multimode fiber has been performed through the use of intensity modulating masks. In such cases, portions of the speckle pattern are not allowed to illuminate a photodetector thereby performing forms of statistical selection of modal patterns. While this technique is robust, it does inherently reduce the sensor's operational dynamic range, and signal-to-noise ratio, due to the simple fact that a portion of the light field is not used. By contrast, it is possible to use phase-contrast enhancing techniques found in microscopy to phase-modulate the fiber's speckle pattern. The performance of a multimode fiber optic sensor using these techniques is compared with the more traditional intensity-modulating fiber optic sensor.

Citation Download Citation

Peter L. Fuhr "Phase-contrast enhancements to a speckle-based fiber optic sensor", Proc. SPIE 3180, Third Pacific Northwest Fiber Optic Sensor Workshop, (2 September 1997); https://doi.org/10.1117/12.285599

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