PHOTOELECTRIC FIELD SENSOR HEAD

• Main Authors: SHUNDO MASASHI, SATO NOBUYUKI, SUGIMOTO TOMOHIKO, HAMADA ATSUSHI, TOBA YOSHIKAZU, KAWAI YOJI, OKUTANI KAZUHITO
• Format: Patent
• Language: English; Japanese
• Published: 11.03.2021
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TESTING

To provide a photoelectric field sensor head that can always operate stably even in an environment with large temperature fluctuations.SOLUTION: The photoelectric field sensor has an optical modulator 1, an input/output optical fiber 2, and a package 3 made of insulator material. The optical modulator 1 has a substrate 4 made of a material having electro-optical effects, a bifurcated interference type optical waveguide 5 formed on the substrate 4, and an electrode antenna 20. The electrode antenna 20 has an antenna unit and a driving electrode unit that applies a voltage signal induced in the antenna unit to a phase-shifted optical waveguide to change its refractive index. On sides 4a, 4b of the substrate 4, antistatic elements 8 made of a material with lower resistivity than the substrate 4 are installed.SELECTED DRAWING: Figure 1 【課題】温度変動の大きな環境下においても常に安定した動作が可能な光電界センサヘッドを提供する。【解決手段】光変調器１と、入出力光ファイバ２と、絶縁体材料で構成されたパッケージ３とを有し、光変調器１は、電気光学効果を有する材料からなる基板４と、基板４上に形成された分岐干渉型光導波路５と電極アンテナ２０とを備えている。電極アンテナ２０は、アンテナ部と、アンテナ部に誘起された電圧信号を位相シフト光導波路に印加しその屈折率を変化させる駆動電極部とを有している。基板４の側面４ａ、４ｂには、基板４よりも抵抗率の低い材料からなる帯電防止体８が設置されている。【選択図】図１