JPS58117598U

JPS58117598U - Physical quantity measuring device using optical sensor

Info

Publication number: JPS58117598U
Application number: JP1148482U
Authority: JP
Inventors: 行雄佐井
Original assignee: 株式会社東芝
Priority date: 1982-02-01
Filing date: 1982-02-01
Publication date: 1983-08-11

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は２波長式の光応用センサを用いた物理量測定装
置の従来例を示すブロック図、第２図は本考案−実施例
の光応用センサを用いた物理量測定装置の構成を示すブ
爾ツク図、第３図ａ、　　ｂ乃至第６図ａ、　　ｂは第
２図の装置の各部における信号の波形を示すもので、第
３図ａ、　　ｂはそれぞれ周波数変調された発光素子２
，３の圧力光の信号波形図、第４図は谷波器４から光フ
ァイバー５に入射された光の信号波形図、第５図は光応
用センサ６の出力光の信号波形図、第６図ａ、　　ｂは
それぞれフィルタ回路１３で分離された電気信号の信号
波形図である。２・・・発光波長λ□の発光素子、３、・・・発光波長
λ２の発光素子、４・・・合波器、５・・・光ファイバ
ー、６・・・光応用センサ、８・・・受光素子、１１．
１２・・・変調駆動回路、１３・・・フィルタ回路。 −第１．１　　− 第３図　　　　　′Fig. 1 is a block diagram showing a conventional example of a physical quantity measuring device using a two-wavelength optical sensor, and Fig. 2 is a block diagram showing the configuration of a physical quantity measuring device using an optical sensor of the present invention. Figures 3a and 3b to 6a and 6b show signal waveforms in each part of the device shown in Figure 2, and Figures 3a and 3b show frequency-modulated light emitting elements 2, respectively.
, 3, FIG. 4 is a signal waveform diagram of the light incident on the optical fiber 5 from the trough wave device 4, FIG. 5 is a signal waveform diagram of the output light of the optical sensor 6, and FIG. a and b are signal waveform diagrams of electrical signals separated by the filter circuit 13, respectively. 2... Light emitting element with emission wavelength λ□, 3... Light emitting element with emission wavelength λ2, 4... Multiplexer, 5... Optical fiber, 6... Optical application sensor, 8... Light receiving element, 11.
12... Modulation drive circuit, 13... Filter circuit. -Chapter 1.1 - Figure 3'

Claims

[Scope of utility model registration request]

(1) A light emitting element that emits light with a wavelength of □ whose intensity is modulated at a frequency f □ by a modulation drive circuit, a light emitting element that emits light with a wavelength λ2 whose intensity is modulated at a frequency f 2 by another modulation drive circuit, and these elements. A multiplexer that combines the light from both optical elements and inputs it into an optical transmission line such as an optical fiber, and a multiplexer that attenuates the light at wavelengths λ1 and λ2 transmitted through the optical transmission line differently according to physical quantities. An optical sensor that attenuates at a rate of A physical quantity measuring device using an optical sensor comprising a filter circuit that separates an electrical signal generated by the signal into signals of frequencies f1 and f2 and outputs the signals.

(2) The optical sensor has a characteristic of attenuating light with wavelength λ1 according to a physical quantity, and causing a constant loss of light with wavelength λ2 regardless of the physical quantity. A physical quantity measuring device using the optical sensor according to claim 1.

(3) A physical quantity using the optical sensor according to claim 1 or 2, characterized in that the modulation frequency of light with wavelength λ2 is zero, that is, direct current light. measuring device.