The DSP System Of Optical Fiber Drop Sensor

As the increasingly maturity of optical fiber sensor technology, optical fiber drop analysis technology tends towards from experiment to practical application gradually. In the past, the optical fiber drop analysis systems were based on personal computer (PC), so that the ayalysis systems were inconvenient to be brought as measurement instruments. The digital signal processors (DSPs) solve this problem perfectly. With the help of DSPs, the optical liquid drop sensors could be established on DSPs chips. Without PC, the optical fiber drop anaylsis systems are more suitable to practical application.The main work of this thesis is to apply DSP technology in the optical fiber drop analysis systems. An optical fiber drop analysis instrument has been built up based on DSPs. The main contexts of this thesis focus on the building of DSP-embedded system, the programme for DSP program, the realization of the correlaction arithmetic, combination of DSPs and a touch screen, the experiment test and so on. The detailed contents are shown as follows:1. The correlation arithmetic was studied. The correlation coefficient and correlation function was used in optical fiber drop analysis.2. The optical fiber drop sensor fabricated previously was improved on in order to adapt to the DSP embedded system.3. A DSP embedded system was built up, which realize the transition from optical fiber drop sensors to optical fiber drop analysis instruments.4. All DSP programs were programmed to realize the functions such as signal collection, digital filter, correlaction arithmetic, touch screen displaying and controlling, auto restart and so on. All this work makes the DSP embedded systems have functions as checking instruments.5. Some experiments have been done using alcohol solutions of different concentrations to test the practicability of this DSP embedded optical fiber drop analysis instrument.