Temperature measurement from the intensity ratio of the Raman-scattering lines in carbon tetrachloride constituting the liquid core of an optical fiber

A liquid-core optical fiber is used to measure the temperature from the intensity ratio of Raman-scattering lines. CCl4 doped with benzene, which ensures conditions for the total internal reflection, serves as the fiber core. Measurements were performed at three Raman-scattering lines in CCl4: 218, 314, and 459 cm(-1). The results obtained at 459 cm(-1) best correspond to the actual temperature. The advantages of using a liquid-core optical fiber and factors affecting the measurement results are discussed.