| 摘要 |
PURPOSE:To obtain a temperature sensor consisting of a small number of components by pressing up an optical fiber directly by part of shape memory alloy and also using a two-directional coil spring. CONSTITUTION:An optical fiber 11b is fixed in a V groove 12 and a fiber 11a is pressed into the groove 12 near its tip by a leaf spring 16. Then, one terminal of torsional coil spring type two-directional shape memory alloy 15 is fixed to a main body 1 and the other terminal pressure the optical fiber 11a against the leaf spring 16 above certain temperature. Consequently, the terminal of the alloy 15 which is not fixed does not contact the optical fibers at the room temperature, so the fiber 11a is pressed into the V groove 12 by the spring 16 and the optical axes of the fibers 11a and 11b are aligned with each other. The alloy 15 is to change its shape above the certain temperature and pressure up the tip of the fiber 11a and the spring 16, so that the optical axes of the fibers 11a and 11b are not aligned any more with each other. Thus, light in the fibers 11a and 11b is transmitted and intercepted about the certain temperature.
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