本文選題：旋光 + 彈光調(diào)制器　； 參考：《中北大學(xué)》2017年碩士論文

【摘要】：隨著科技的發(fā)展,物質(zhì)的旋光性在食品安全、藥物鑒別、醫(yī)學(xué)、石油、化工等領(lǐng)域得到越來越廣泛的應(yīng)用,其中對(duì)旋光角的測(cè)量更是至關(guān)重要。由于彈光調(diào)制器高調(diào)制精度、寬光譜窗口、大視場(chǎng)角等優(yōu)點(diǎn),選用彈光調(diào)制器對(duì)信號(hào)進(jìn)行調(diào)制,同時(shí)利用數(shù)字鎖相解調(diào)技術(shù)獲取旋光角。本文首先分析了旋光原理、彈光調(diào)制器工作原理以及數(shù)字鎖相解調(diào)技術(shù)的原理,并根據(jù)斯托克斯參量和穆勒矩陣推導(dǎo)出基于彈光調(diào)制器測(cè)旋光的原理,然后搭建了測(cè)量旋光的光路系統(tǒng)。然后設(shè)計(jì)了以FPGA為核心的硬件電路,主要包括信號(hào)放大模塊、A/D轉(zhuǎn)換模塊、串口通信模塊以及光耦隔離模塊等。在FPGA內(nèi)部完成了基于DDS技術(shù)方波驅(qū)動(dòng)信號(hào)的產(chǎn)生、放大電路放大倍數(shù)的控制、A/D采集時(shí)鐘的控制和數(shù)字鎖相算法,并搭建SOPC系統(tǒng)實(shí)現(xiàn)了Lab VIEW對(duì)FPGA的控制。其中,通過串口將數(shù)字鎖相的乘累加數(shù)據(jù)傳輸?shù)絃ab VIEW中,在Lab VIEW中進(jìn)行數(shù)據(jù)拼接,并最終在上位機(jī)中完成數(shù)據(jù)的分析和處理。同時(shí),Lab VIEW還可以發(fā)送數(shù)據(jù)到FPGA中,對(duì)驅(qū)動(dòng)方波信號(hào)的頻率、放大電路的放大倍數(shù)以及乘累加的時(shí)間進(jìn)行控制。最后,對(duì)硬件部分和軟件部分分別進(jìn)行了測(cè)試,搭建了旋光測(cè)量實(shí)驗(yàn)平臺(tái),并對(duì)不同濃度的葡萄糖溶液進(jìn)行了旋光測(cè)量實(shí)驗(yàn)。實(shí)驗(yàn)結(jié)果表明本系統(tǒng)測(cè)量旋光角的靈敏度為0.00041°,最大相對(duì)偏差為2.78%,針對(duì)650nm入射激光葡萄糖溶液的比旋光率為31.0(°ml·g~(-1)·dm~(-1))。本系統(tǒng)具有靈敏度高、工作穩(wěn)定、便于集成化設(shè)計(jì)等優(yōu)勢(shì)。
[Abstract]:With the development of science and technology, the optical activity of substances is more and more widely used in the fields of food safety, drug identification, medicine, petroleum and chemical industry, among which the measurement of optical rotation angle is more and more important. Because of the advantages of high modulation precision, wide spectral window and large field of view, the elastic-optical modulator is used to modulate the signal, and the digital phase-locked demodulation technique is used to obtain the optical rotation angle. In this paper, the principle of optical rotation, the working principle of elastic-optic modulator and the principle of digital phase-locked demodulation are analyzed, and based on Stokes parameter and Muller matrix, the principle of measuring optical rotation based on elastic-optical modulator is deduced. Then the optical circuit system for measuring optical rotation is set up. Then the hardware circuit with FPGA as the core is designed, which mainly includes signal amplification module, serial communication module and optocoupler isolation module, etc. The generation of square wave driving signal based on DDS technology, the control of amplification power of amplifying circuit and the control of A / D acquisition clock and digital phase-locked algorithm are completed in FPGA. The SOPC system is built to realize the control of Lab VIEW to FPGA. Among them, the multiplicative accumulative data of digital phase-locked is transmitted to Lab VIEW through serial port, and the data is spliced in Lab VIEW, and finally the data is analyzed and processed in the upper computer. At the same time, Lab VIEW can also send data to FPGA to control the frequency of the driving square wave signal, the magnification of the amplifier circuit and the time of multiplication and accumulation. Finally, the hardware part and the software part were tested, the optical rotation measurement platform was set up, and the optical rotation measurement experiments were carried out for glucose solution with different concentrations. The experimental results show that the sensitivity of the system is 0.00041 擄and the maximum relative deviation is 2.78. The specific optical rotation rate of the 650nm incident laser glucose solution is 31.0 (擄ml / g ~ (-1) DMC ~ (-1). The system has the advantages of high sensitivity, stable work and easy integrated design.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN761

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