| 摘要 |
PURPOSE:To enable the prevention of ignited explosion in a mine or the like by having a high molecular substance dissolved or dispersed somewhere between two light wave guides while an organic medium adapted to be reversibly precipitated by a temperature change. CONSTITUTION:A light temperature sensor is made up of a temperature detection body 1, optical fibers 2 and 2', a light source 3, a photodetector 4 and focusing lenses 5 and 5' while the detection body 1 houses an organic medium in which a high molecular substance is dissolved or dispersed in a transparent cell. The high molecular substance and the organic medium preferably combine polystylene and cyclohexane and polyethylene and diphenyl ether to be reversibly precipitated at the room temperature and near 150 deg.C or dissolved. The blending ratio thereof is more than 0.01vol% for the high molecular substance in terms of the total of the two components. The thickness of a cell housing both shall be 0.5mm. or more. |
