Hydac dh optical fiber temperature sensor classification and interference
hydac dh temperature sensor head end by Cr3, + ion doping, realize the optical excitation fluorescence emission. With length is 8 ~ 10 mm. End the outer surface of the fiber optic plating black body cavity at the same time, used in radiation temperature measurement. ( At this time, the black body cavity length and the diameter ratio of more than 10, can satisfy the requirement of black body radiation apparent rate constant) 。 It is worth noting, avoid or reduce the interference of fluorescence emission parts and thermal radiation, to ensure the performance of the whole system is very important.
after analysis, the interference can be found that the main performance is:
1) Fluorescence signals in the radiation background influence on fluorescence lifetime testing precision,
2) fiber optic equipment surface plating influence on fluorescence intensity,
3) Fiber Cr3, + ion doping on the black body cavity within the influence of thermal radiation signal.
type of temperature sensor is divided into: distributed temperature sensor and fluorescence temperature sensor.
the distributed temperature sensor
distributed temperature sensor, usually with the detection of spatial temperature distribution in the system, its principle as early as in 1981, as scientists after experimental research, developed the technology. The principle of sensor development is based on the research of three kinds of sensors, respectively is Rayleigh scattering and brillouin scattering, Raman scattering. In the Rayleigh scattering ( OTDR） And the brillouin scattering ( OTDR） Research has made great progress, so the sensor research focus in the future, will be on based on Raman scattering ( OTDR） New research of distributed sensor.
close to the Turkish Gunes Yilmaz developed a distributed temperature sensor, the sensor temperature resolution is 1 ℃, the spatial resolution is 1. 23m。 Also has a lot of university in China carried out the study of distributed temperature sensor, for example, China university of measurement in 1997 invented the coal temperature detection sensor system, the test temperature for - 49 ℃ ~ 150 ℃, the temperature resolution of 0. 1℃。
fiber optic fluorescence temperature sensor
when is a hot research, is for the fiber optic fluorescence temperature sensor, the use of fluorescent material is glowing characteristics, to detect the temperature of the light emitting area. The fluorescent material is usually in ultraviolet or infrared stimulation, there will be glowing, emitting light parameters and temperature is a connection, so you can through the detection of fluorescence intensity to test temperature.
in colleges and universities around the world are designed such sensors, for example, in Seoul, South Korea university found 10 cm double doped fiber, reflected in its 915 nm index of the fluorescence intensity of the corresponding temperature is 20 ℃ ~ 290 ℃; Tsinghua university in China to borrow GaAs semiconductor materials to absorb the light, and then to the principle of light change with temperature, developed temperature range is 0 ℃ ~ 160 ℃ of fiber optic fluorescence temperature sensor.
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