FOT

Germany HYDAC dh optical fiber temperature sensor application range

by:FOT     2020-06-16

Germany HYDAC dh optical fiber temperature sensor applications

Germany HYDAC dh, many different kinds of optical fiber temperature sensor, in addition to the above introduction of fluorescence and distributed optical fiber temperature sensor, optical fiber grating temperature sensor, interferometric fiber optic temperature sensor and optical fiber temperature sensor based on bending loss, etc. , because its a lot of more phyletic, the development is also very widely used, for example, used in power system, construction, aerospace and Marine development, etc.

in the power system industry: the development of optical fiber temperature sensor in the application of power system development, because of the power cable temperature, the temperature of the internal temperature of the high-voltage power distribution equipment, power plant environment, etc. , you need to use fiber optic sensor measurement, thus promoting the continuous improvement of the optical fiber sensor and development. Especially distributed optical fiber temperature sensor has been improved through the application in electric power system industry, which makes the receiving signal and the ability to deal with detection system has improved.

in the construction industry: the development of optical fiber grating temperature sensor due to its advantages of high resolution and measuring range, temperature measurement is widely used in construction industry. Many western developed countries, this system has been widely used, for building safety indicators, such as temperature, displacement testing work, for example, the Mexican using grating temperature sensor, temperature testing of highway Bridges. Through widely used, the existing problems in the grating temperature sensor, such as: elimination of cross-sensitivity, packaging of fiber Bragg grating were resolved, and this system has been perfect.

aerospace application development: aerospace use sensors of high frequency, including the pressure, temperature, fuel of vehicle and so on various aspects of the test, you need to use optical fiber temperature sensor, and the number of sensors used in as many as hundreds of, so is very strict with the size and weight of the sensor. Therefore, based on the demand of aerospace on the sensor, optical fiber temperature sensor adjustment after the volume, weight specifications.

choose advantages: hydac dh fiber optic sensor adopts the principle, structure, style, its potential has the advantage of high accuracy of measurement, resistance to electromagnetic interference, security, explosion-proof, around well. While the existing temperature sensor should not be used for flammable and explosive occasions.

hydac dh optical fiber sensor is a kind of sensing device, use of the principle of the absorption spectrum changes over temperature, analysis of optical fiber transmission spectrum real-time temperature. Main material such as fiber optic equipment, spectrum analyzer, transparent crystal, divided into distributed, fiber optic fluorescence temperature sensor. Adopting a win min polymer materials and optical fiber refractive index matching coated fiber root welding together the two outside, make light of a single fiber input the reflecting surface from another optical output, because the new win min materials affected by the temperature, the refractive index changes, so the output optical power and function relation to the temperature.

HYDAC dh optical fiber temperature sensor in its physical essence is the use of fiber optic equipment transmission of the light wave characteristic parameters, such as amplitude, phase, polarization, wavelength and mode, etc. , the external environment factors, such as temperature, pressure, radiation sensitive characteristics, etc. It belongs to the non-contact temperature measurement.

HYDAC dh optical fiber temperature sensor system structure

from room temperature to 1800 ℃ temperature measurement of the optical fiber temperature sensor system mainly includes the end doped optical fiber sensing head, Y type quartz fiber optic equipment tracts, super bright light emitting diode ( 领导) And the drive circuit, photoelectric detector, the fluorescent signal processing system and radiation signal processing system.

HYDAC dh working principle of optical fiber sensor system as follows: in the low temperature area ( Below 400 ℃) , the radiation signal is weak, the system open the light emitting diode ( 领导) The fluorescence temperature measuring system work. Light emitting diode modulation of excitation light, the condenser is coupled to a branch of the Y type optical fiber end, the Y type optical fiber and optical fiber coupler coupling to the optical fiber temperature sensing head.

HYDAC dh optical fiber sensor head end motivated excitation and emission fluorescent light, fluorescent signal derived from optical fiber, and through the optical fiber coupler from another branch of Y type optical fiber end, consists of photoelectric detector. The light of the photodetector output signal after amplification by fluorescent signal processing system for processing, calculation fluorescence lifetime and the resulting measured temperature value. In the high temperature ( More than 400 ℃) , the radiation signal is strong enough, radiation temperature measurement system, light-emitting diodes (leds) closed. Radiation signal through the sapphire fiber and through Y type optical fiber output, converted to electrical signals by the detector, the system measured temperature is obtained by calculation of the radiation signal strength.

by the end of optical fiber sensing head Cr3, + ion doping, the realization of the optical excitation fluorescence emission. With optical fiber 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 optical fiber 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 the analysis of interference can be found that the main performance is:

1) Fluorescence signals in the radiation background influence on fluorescence lifetime testing precision.

2) The influence of fiber surface plating on fluorescence intensity.

3) Fiber Cr3, + ion doping on the black body cavity within the influence of thermal radiation signal.


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