Fiber optic-based correlating and sensing system

Details Fiber optic-based correlating and sensing system Fiber optic-based correlating and sensing system

1995-12-22

1997-02-25

Henry, Jon W.

Optical: systems and elements

Holographic system or element

Fourier transform holography

359 34, 359559, 382210, 382280, G03H 116, G02B 2746

Patent

active

056064357

ABSTRACT:
The fiber optic-based correlating and sensing system (the System) utilizes length of optical fiber through which the object beam travels prior to being incident on the holographic plate. First, a matched filter is created on the holographic plate of the initial condition of the environment. Then when the plate is re-placed in its original position in the System and the reference beam is blocked from reaching the plate, a correlation peak appears as the object beam passes through the holographic plate. To use the System as a correlator, the object beam is transmitted through an input scene prior to its travel through the optical fiber. The changes in the input scene from the initial scene causes broadening of the shape of and degradation of intensity of the correlation peak. To use the System as a sensor, the object beam travels through the optical fiber acquiring information regarding the environment surrounding the fiber, such as pressure, temperature, sound, electric and magnetic fields. Again, the changes in the environment are indicated by the broadening shape and decreased intensity level of the correlation peak.

REFERENCES:
patent: 4150360 (1979-04-01), Kopp et al.
patent: 4664516 (1987-05-01), Coppa et al.
patent: 5136666 (1992-08-01), Anderson et al.
patent: 5216529 (1993-06-01), Paek et al.

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