| 摘要 |
PURPOSE:To measure pressure with high accuracy by simple structure by detecting a component in a specific direction of a birefringent index elliptic body as light intensity. CONSTITUTION:Laser light emitted by a semiconductor laser generating device 14 passes through a 1/4-wavelength plate 16 and is reflected by a light branching plate 18 to enter a pressure sensing member 10 from its upper end surface. The light incident on the pressure sensing member 10 passes in the pressure sensing member 10 and reaches the other end surface, i.e., lower end surface and is reflected by a reflecting plate 12 to pass in the pressure sensing member 10 again and then travel straight in the optical branching plate 18, thereby entering an analyzer 20. Then only part of the light, i.e. light in the specific vibrating direction reaches a photodetecting element 20 through an analyzer 20 and is photodetected by the photodetecting element 22. Then stress, i.e. pressure applied to the pressure sensing member 10 is found from the output of the photodetecting element 22. Consequently, the pressure is measured with high accuracy by the simple structure.
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