| 摘要 |
<p>PURPOSE:To measure exactly a temp. without an electric noise by introducing a polarized light to an optical fiber preserving polarized wave surface provided at a temp. measuring place, detecting a rotation of a polarization axis by Senarmonp method and by comparing it with a rotating property measured previously. CONSTITUTION:A temp. sensitive part 6 of the optical fiber 2 preserving polarization wave surface is provided at the temp. measuring place and the light of a light source 5 is polarized linearly through a polarizer 1 and is made incident. A phase difference caused at this time is measured by Senarmonp method. The transmitted polarization light made elliptical at the part 6 is changed to the linear polarized light by a 1/4 wavelength plate 3 and is made incident to an analyzer 4, and the light strength is detected by a photoelectric detector 7 and a light power meter 8. At the time, the analyzer 4 is rotated so that a needle of a meter 8 indicates min. light amount, and temp. variation can be known by comparing the rotation angle with the rotation property due to temp. variation measured previously. Thereby, the temp. can be measured exactly without the electrical noise.</p> |
