PURPOSE: To obtain an interferometer sensor in which the sum of interference spectrums related to temperature variation and pressure variation can be found using central and outer luminous fluxes being transmitted concentrically through an optical fiber.
CONSTITUTION: At the time of operation, a sensor membrane 115 is subjected to pressure and temperature of a production pit and moved by a distance equal to the thickness of flat plates 13, 12 in response to the parameters thereof. Consequently, the stagger of luminous flux passing through a first interferometer along an optical path A in the vicinity of the axis of symmetry of sensor is varied as a function of the membrane 115. An annular luminous flux passing through a second interferometer along an optical path B is shifted over the distance between elements 16, 17. The distance is varied by the difference of expansion coefficient between respective elements as a function of temperature. Consequently, the stagger of luminous flux on the optical path B is varied. Output lights from two interferometers are mixed at the inlet of fiber 113 and carries a stagger indicative of the moving distances 2e, 2e'.
JIYATSUKU PUROO
FURANSOWAAMARI ROBEERU
GUZABIE DEFUORUJIYU
