Interferometer having a short coherence length light source and means for identifying interference fringes

摘要

PCT No. PCT/GB90/00267 Sec. 371 Date Sep. 23, 1991 Sec. 102(e) Date Sep. 23, 1991 PCT Filed Feb. 19, 1989 PCT Pub. No. WO90/09557 PCT Pub. Date Aug. 23, 1990.An interferometer utilises a short coherence length light source in such a way that the visibility of fringes produced varies as a function of the measurand. In order to provide a signal which represents the value of the measurand, the visibility of the fringes is calculated.