Fiber optic strain sensor and read-out system

Details Fiber optic strain sensor and read-out system Fiber optic strain sensor and read-out system

1994-02-14

1995-12-19

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356352, 385 12, G01B 902

Patent

active

054773237

ABSTRACT:
An optical sensor is described comprising a first optical fiber and a first reflective member. The first optical fiber has a first predetermined length of graded-index multimode optical fiber attached to its end. The first reflective member and the first optical fiber are arranged such that a gap is formed between the unattached end of the graded-index multimode optical fiber and the first reflective member. Also described is a rugged sensor design incorporating the first optical fiber and first reflective sensor as well as a method for providing the predetermined length of graded-index multimode fiber at the end of the first optical fiber. Finally, a readout system for an optical sensor is also described which comprises two optical paths differing in length by an amount equal to an optical path distance in the optical sensor. The readout system also comprises an optical source having a wavelength differing from that of the optical sensor, a modulator and a controller. The readout system provides a linear output signal that is independent of temperature and vibration effects associated with the read-out system.

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