| 摘要 |
PURPOSE:To perform stable measurement even under the environment such that the vibration is applied to a measuring meter, by dividing luminous flux to be measured into a pair of two luminous fluxes and respectively propagating both luminous fluxes through independent solid closed passages. CONSTITUTION:The luminous flux 2 to be measured emitted from a beam source 1 becomes parallel luminous flux 4 to be incident to an optical fiber bundle 5. The optical fiber bundle 5 is composed of (N) pairs of fiber pairs 6 each consisting of two fibers. One fiber 7 of each fiber pair has an equal beam path length (l) with respect to (N) pairs of fiber pairs 6 and the other fibers 8 are different at every pairs and the beam path length of one fiber of the n-th pair becomes l+(n-N/2)XDELTAl. By this constitution, there is beam path length difference of (n-N/2)XDELTAl between two fibers of the n-th pair and beam path difference is different by DELTAl between the n-th pair and the (n+1)-th pair. The beam from two fibers 7, 8 of each pair is again coupled by a beam coupler 9 to generate interference and detected by the corresponding pixel 11 of a unidimensional multichannel beam detector 10 composed of N-bit pixels. By this method, stable measurement can be performed even under the environ ment such that vibration is applied. |
