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Optimal Design Of Optic Fiber Temperature Measurement System Based On The Fluorescence Decay

Posted on:2010-09-19Degree:MasterType:Thesis
Country:ChinaCandidate:T JiaFull Text:PDF
GTID:2178360272999409Subject:Detection Technology and Automation
Abstract/Summary:PDF Full Text Request
The fluorescence optical fiber temperature sensor is one of the interested problems that are researched in the field of modern optical fiber sensor technology. The situations of measurement temperature are specially, it is difficult to measure temperature for them, and so the other temperature sensor is searched in all research. The virtues of the fluorescence optical fiber temperature sensor are electromagnetic interference resisting, little bulk, low transmission loss, corrosion resisting. More and more attention is put on the fluorescence optical fiber temperature sensor.In order to improve precision and stability of Temperature measurement system, the paper describes the optimal design of optical temperature measuring system based on fluorescence lifetime in three aspects, including sensing section, data processing algorithms and the design of detection circuit.It is found that the fluorescent decay can not be treated as exponential variation. The fluorescent lifetime has relationship with its intensity, it makes the lifetime changing with many factors such as the intensity of exciting light,the light transmission efficiency and the amplification factor of channel. The fluorescent light-emitting mechanism is analyzed deeply and points out the reason of the non-exponention is the relationship between the non-exponential component of fluorescent decay and the light spectra. So a cutting and normalized method based on graphic is given to determine the non-exponential degree of according to the comparition of the density degree of different cutting and normalized curvesFour kinds of common decay curves data processing methods based on single-exponential model is analyzed in simulations, which including least square method, integral area ratio method, 1-m method and FFT method. In order to match the mathematic model, a prony method for multi-exponential model has been bring in, and the potential of prony in processing multi-exponential model is presented by simulation experiments. In the optimal design of detection circuitry, the analysis is focused on the linearization of optoelectronic devices, frequency band of amplifier and the suppression of noise and interference.The temperature measurement experiment is build and the correctness of the above analysis has been verified.
Keywords/Search Tags:Fluorescence, Data Processing, Lifetime, Optical Sensor
PDF Full Text Request
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