| 摘要 |
PURPOSE: To realize a physical quantity detection with high accuracy regardless of the environmential condition in the using time, by providing a detecting element, an optical modulator, and a light receiver. CONSTITUTION: While an electric signal including a detecting data is applied from the detecting terminals 3 of a detecting element 40 to a pair of modulator electrodes 25 in an optical modulator 1, an input transmission light from a light source 11 is transmitted to the optical modulator 1 passing through an input optical fiber 6. By using optical wave guides 22 and 23 after the part between a detector and a measure is cut off electrically, an electric signal (a voltage) detected primarily by the element 40 can be transmitted accurately under a low loss condition with no noise. Furthermore, by changing the exclusive element 40 to every detecting object by using a single measuring unit, the detector can be composed as the physical quantity detector which can detect various physical quantities except the electric quantity with high accuracy. As a result, it can be used effectively in a remote transmission, and it can detect various physical quantities without receiving the influence in the using circumstances. |
