An Adaptive Temperature Compensation Ultra-high Pricision Sensor System

Fiber Bragg Grating (FBG) has many advantages, which application is very wideand also has its unique advantages in sensing. Sensing signal demodulation technologyis a critical part for the application of fiber Bragg grating sensor. Therefore, we studiedaccording to the present existing widespread problems such as low precision and highcost, expected to promote the practical development of the fiber Bragg grating sensingsystem.This thesis puts forward a kind of adaptive temperature compensation sensorsystem of high precision based on Digital Signal Processor (DSP) and cross-correlationalgorithm. First of all, this paper introduces the theoretical principle of cross-correlationalgorithm, in order to verify the reliability and validity of the algorithm we didexperimental verification, after the cross-correlation algorithm is introduced andvalidated, we introduce the cross-correlation algorithm into the fiber grating experimentsystem (set up by high precision tunable light source part, sensor part and high precisionDSP sensing demodulation part), system calibration experiment was carried out.In the process of the experiment we found the deficiency existing in the originalsensing system and the places can be improved, optimized according to the existingproblem and the shortcomings of the sensor system, use another FBG and a new schemeof high precision tunable laser source in the sensing system are introduced, contrastvarious performance of DSP2812and DSP5509, explain the reason of the changing, thesoftware optimization of the system’s based on DSP5509, as well as the principle andthe role of the photoelectric detector and divider.Then, we adopt the method of parallel instead of series to link the two FBG, one isused as a reference and the other one is used as sensor, after completing the new trialsystem, we complete the system performance calibration experiments using the newexperiment system under the environment of zero and room temperature, usingcross-correlation algorithm to deal with the experimental data to get the precision of thesystem.Finally, there is a simple introduction and analysis of the stress and tempreturesensing principle, the experiment device and experiment process of sensor measurementis described, use our experimental system for the actual stress and tempretureexperimental measurements, do data analysis to obtain the precision of the system in thesensor. Summarizes the current situation of the experimental system, and puts forwardits shortcomings, discusse the future work.In this thesis, the research show that the designed adaptive temperaturecompensation ultra-high precision sensor system has the feasibility, effectiveness andlow cost, high precision, small volume, susceptible to external environment influence, reliability, etc.