Accession Number : ADD014005

Title :   Fiber Optic Coherence Meter.

Descriptive Note : Patent, Filed 26 Sep 86, patented 31 May 88,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Geary, Joseph M

Report Date : 31 May 1988

Pagination or Media Count : 5

Abstract : An incident light field is applied to the two separate front fiber faces of a pair of identical optical fiber which are initially held in a common plane. One fiber face is always kept stationary. The other fiber face may be moved either laterally in a plane common to the stationary face or longitudinally into and out of the common place. The output end of the device comprises two separate rear fiber faces that are held in a common plane. These faces are stationary. There is no lateral or longitudinal motion of one relative to the other. The light emerging from these two faces interferes in the far field. Straight line interference fringes whose spacing depends upon the lateral separation of the rear fiber faces are formed. The fringe modulation, however, depends upon the relative position of the front fiber faces. This modulation changes as one front face is scanned either laterally or longitudinally. The modulation changes with such motion is related to the degree of spatial or temporal coherence of the incident light field. Patents. (RH)

Descriptors :   *FIBER OPTICS, COHERENCE, FAR FIELD, FIBERS, INTERFERENCE GUARD BAND, LIGHT, MEASURING INSTRUMENTS, MODULATION, PATENTS, POSITION(LOCATION), RANGE(DISTANCE), SEPARATION

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE