| 摘要 |
PURPOSE:To transmit and receive general information at the same time, to provide convenience for measuring operation, and to make the whole system simple in constitution by measuring light information showing a distribution state when the distribution state of distribution temperature, etc., is measured by an optical fiber and also provided optical multiplexer demultiplexers on the path of the optical fiber sensor. CONSTITUTION:A distribution temperature measurement system which uses the distribution type optical fiber sensor 1 make pulse light having specific wavelength incident on the optical fiber sensor 1 from a distribution temperature measuring instrument 3, and photodetects back scattered light, returning to the incidence terminal by Raman scattering from an optical position and converts it into an electric signal by the measuring instrument 3 to obtain distribution temperature data on each length position. At the same time, a transmitter 4 and a receiver 4' for optical communication which make a communication of general information are additionally provided and the communication is made through the optical multiplexer demultiplexers 2 and 2' provided halfway on the optical path of the optical fiber sensor 1. Different wavelengths are used for the measured back scattered light and a light signal for communication and the light beams having those wavelengths are multiplexed on a transmission die and demultiplexed on a reception side. |
