JPH044263U

JPH044263U -

Info

Publication number: JPH044263U
Application number: JP4613490U
Authority: JP
Priority date: 1990-04-27
Filing date: 1990-04-27
Publication date: 1992-01-16

Description

[Brief explanation of drawings]

第１図は本考案の屈折率測定装置の一実施例を
示す装置構成図、第２図は第１図装置に用いられ
る光変調素子を示す図、第３図は従来例を示す装
置構成図である。１……光源、２……ハーフミラー、３……ミラ
ー、４……干渉計、５……長い長さ基準を有する
基準間隔部、６……短い長さ基準を有する基準間
隔部、７……光検出器、８……演算器、９……制
御回路、１０，２０……光スイツチ、１１，２１
……光変調素子、１２，２２……偏光板、５ａ，
５ｂ，６ａ，６ｂ……反射面。 Fig. 1 is an apparatus configuration diagram showing an embodiment of the refractive index measuring device of the present invention, Fig. 2 is a diagram showing a light modulation element used in the apparatus shown in Fig. 1, and Fig. 3 is an apparatus configuration diagram showing a conventional example. It is. DESCRIPTION OF SYMBOLS 1...Light source, 2...Half mirror, 3...Mirror, 4...Interferometer, 5...Reference interval part having a long length reference, 6...Reference interval part having a short length reference, 7... ...Photodetector, 8...Arithmetic unit, 9...Control circuit, 10,20...Optical switch, 11,21
... Light modulation element, 12, 22 ... Polarizing plate, 5a,
5b, 6a, 6b... Reflective surfaces.

Claims

[Scope of utility model registration request]

A light source, an interferometer into which the output light of the light source is input, an optical component that further splits the two lights split by the interferometer into a plurality of lights, and a reflecting surface are arranged parallel to each other with a predetermined length standard. a plurality of reference spacing sections into which a plurality of lights branched by the optical component are respectively incident; a light modulation element arranged between the optical component and the reference spacing section and rotating the plane of polarization by a voltage signal to be described later; a plurality of optical switches composed of polarizing plates for obtaining the optical signal; a photodetector for converting the interference signal obtained by the interferometer into an electrical signal as the optical path length of the light reflected from the reference interval section changes; A control circuit that controls the voltage signal applied to the switch and determines from which reference interval the electrical signal obtained from the photodetector comes from, and a control circuit that detects the phase from the electrical signal obtained from the photodetector and detects the refractive index. 1. A refractive index measuring device comprising: a computing unit for computing the absolute value of .