熒光偏振檢測(cè)系統(tǒng)研究
[Abstract]:The fluorescence polarization detection system is developed and designed by using fluorescence polarization as the basic principle. The system has been widely used in medical treatment, life science, drug development, environmental monitoring and so on. In this paper, fluorescence polarization detection system is mainly used in biomedical detection and detection of organic molecules in environmental protection. The principle of fluorescence polarization detection is to detect the polarization intensity of the emission light generated by the excitation of the sample labeled by the fluorescence probe. The fluorescence of a specific wavelength produced by the irradiation of the sample by excitation light passes through the emission filter and the emission polarizer, and then becomes polarized light into the photomultiplier tube, The function of photomultiplier tube is to convert vertical or horizontal polarized light signal into weak current signal. The current signal is transformed into analog voltage signal of appropriate size by conditioning circuit, and input to microprocessor via SPI interface. The microprocessor can be processed to determine whether the sample is a substance to be tested. The thesis mainly designs from two aspects: the hardware design of the fluorescence polarization detection system and the software design of the fluorescence polarization detection system. The software design of fluorescence polarization detection system is divided into system function program development and host computer software development. The hardware design of the fluorescence polarization detection system mainly includes the main control circuit, the fluorescence detection circuit, the light source brightness detection circuit, the light source driving circuit, the stepper motor driving circuit, the A / D conversion circuit, the communication circuit and so on. The driving circuit of the stepper motor is used to drive the step motor to locate the reagent plate, to select the different optical lens combination needed for different sample detection and to measure the horizontal polarized light intensity in the detection process. The horizontal polarizer and the vertical polarizer in the emission path are selected respectively. The system program function of the software part mainly introduces the whole operation flow and the fluorescence detection flow of the system. The upper computer part is not within the scope of the detailed discussion in this paper, only the function of the upper computer is simply introduced. The designed fluorescence polarization detection system is verified by various experiments and all functions meet the design requirements.
【學(xué)位授予單位】:西安工業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:TH74
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