本論文使用自我注入鎖定技術，發展微波非破壞性糖度感測器，在此微波感測器中使用互補分裂環形共振器(CSRR)當作糖水感測元件，根據不同濃度糖水的介質變化，感測器解調出來的訊號將隨之不同。此論文將逐步驗證此非破壞性糖度感測器的可行性；首先初步驗證不同糖水濃度與感測元件CSRR相位的關係；進一步設計注入鎖定振盪器，搭配CSRR成為主動式糖度感測器，驗證不同糖水濃度與振盪器振盪頻率偏移量的關係；除此之外，在感測器中加入鎖相迴路(PLL)鎖定振盪器振盪頻率並解調糖水濃度訊號，擺脫以往需使用網路分析儀或頻譜分析儀解調資料的限制，並驗證PLL解調的電壓訊號與糖水濃度關係；最後於感測器迴路中加入開關提供IQ通道，藉此解調待測物的複數介電係數εr=εr'+jεr''。

This thesis develops a microwave non-destructive sucrose concentration sensor based on the self-injection-locked (SIL) technology. The complementary split ring resonator (CSRR) is treated as the sucrose sensing component in the developed SIL sensor. The demodulated output signal will be varying according to the different concentrations of the sucrose solutions, which have different permittivities. This thesis will verify the feasibility of the proposed non-destructive sucrose concentration sensor. First of all, the relationship between the sucrose concentration and the phase shift of the CSRR will be validated. Second, we design a self-injection-locked oscillator (SILO) with CSRR as an active sucrose concentration sensor, and then verify the relationship between the sucrose concentration and the frequency deviation of the SILO. Furthermore, the phase-locked loop (PLL) is added to this sensor to lock the oscillation frequency of the SILO and then used to demodulate the concentration level of liquid under test. It has a great potential to get rid of the limitation of using a network analyzer or a spectrum analyzer to demodulate the signal aforementioned sensing works. Finally, a switch is added to the sensor to provide I and Q channels for demodulating the complex permittivity, εr=εr'+jεr''.

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