Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1986-09-26
1988-05-31
LaRoche, Eugene R.
Optics: measuring and testing
By particle light scattering
With photocell detection
356354, G01B 902
Patent
active
047476885
ABSTRACT:
An incident light field is applied to the two separate front fiber faces of a pair of identical optical fibers 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 plane. 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.
REFERENCES:
patent: 3639063 (1972-02-01), Krogstad et al.
patent: 3879988 (1975-04-01), Jacobs
patent: 4090793 (1978-05-01), Lebduska
patent: 4265539 (1981-05-01), Gaffard
patent: 4352565 (1982-10-01), Rowe et al.
patent: 4495411 (1985-01-01), Rashleigh
Iiyama et al., "Optical Field Mapping . . . Fibers", Applied Optics, vol. 17, No. 12, pp. 1965-1971, Jun. 15, 1978.
Iiyama et al. "Optical Field Mapping . . . Fibers", Nachrichtentech Z (NTZ), Germany, vol. 31, No. 2, Feb. 1978, pp. 138-139.
Ham Seung
LaRoche Eugene R.
Singer Donald J.
Stepanishen William
The United States of America as represented by the Secretary of
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