基于微波解調(diào)技術(shù)的光纖折射率陣列傳感器研究
發(fā)布時間：2018-09-02 08:00
【摘要】：折射率是一個表征液體特性的重要參數(shù),光纖折射率傳感器因其抗電磁干擾能力強(qiáng)、探頭微型化等一系列優(yōu)點而備受關(guān)注,使得其在生物醫(yī)學(xué)和環(huán)境監(jiān)測等領(lǐng)域有著廣泛的應(yīng)用。針對目前光纖折射率傳感器結(jié)構(gòu)復(fù)雜、集成度差等問題,本文研制了一種光纖折射率陣列傳感器,該陣列可實現(xiàn)傳感器的多功能化以及解決交叉敏感等問題。本文還基于微波解調(diào)技術(shù)搭建了一套折射率陣列傳感器解調(diào)系統(tǒng),并使用該系統(tǒng)來實現(xiàn)折射率傳感。本文研究的主要內(nèi)容如下:(1)本文對光載波的微波測量技術(shù)進(jìn)行了理論分析,并通過仿真驗證了該技術(shù)的可行性。在理論分析和仿真的基礎(chǔ)上,搭建了一套用于折射率陣列傳感器的解調(diào)系統(tǒng)。(2)使用去噪算法對信號做處理,并對該解調(diào)系統(tǒng)進(jìn)行了性能分析。本文使用累加平均和小波變換兩種算法對解調(diào)信號進(jìn)行了去噪處理,對比去噪前后信號,累加平均和小波變換對噪聲有較好的抑制作用。(3)用搭建好的系統(tǒng)來解調(diào)光纖折射率陣列傳感器,并做了液體折射率測量實驗。本文提出了一種自校準(zhǔn)結(jié)構(gòu)來提高測量精度,并制作了自校準(zhǔn)傳感器。本文中的折射率傳感器是基于菲涅爾反射型的,采用一個1×8的光纖分路器來實現(xiàn)傳感器陣列的并聯(lián)復(fù)用,從而實現(xiàn)了折射率陣列傳感器的8通道同時測量。實驗結(jié)果表明由此解調(diào)的折射率傳感器靈敏度可達(dá)4.228mV/RIU,線性度約為0.989,并具有良好的穩(wěn)定性和重復(fù)性。由于本文提出的解調(diào)技術(shù)是基于強(qiáng)度解調(diào),因此易受光源波動和傳感光纖振動等干擾,為此提出了一種自校準(zhǔn)結(jié)構(gòu)。自校準(zhǔn)結(jié)構(gòu)就是制作一種具有兩個反射面的傳感器,一個反射面位于光纖內(nèi)作為參考面,一個反射面作為測量面,將兩個反射信號的反射強(qiáng)度相除便可以消除波動的干擾,實驗結(jié)果表明自校準(zhǔn)傳感器可使測量精度由0.052%提高到0.015%,線性度由0.9888提高到0.9996。
[Abstract]:Refractive index is an important parameter to characterize liquid properties. Optical fiber refractive index sensor has attracted much attention because of its strong ability to resist electromagnetic interference and miniaturization of probe. It has been widely used in biomedicine and environmental monitoring. Aiming at the problems of complex structure and poor integration of optical fiber refractive index sensor, a kind of optical fiber refractive index array sensor is developed in this paper, which can realize the multi-function of the sensor and solve the problem of cross-sensitivity. A refractive index array sensor demodulation system is built based on microwave demodulation technology, and the system is used to realize refractive index sensor. The main contents of this paper are as follows: (1) the microwave measurement technology of optical carrier is theoretically analyzed, and the feasibility of the technique is verified by simulation. On the basis of theoretical analysis and simulation, a demodulation system for refractive index array sensor is built. (2) the signal is processed by denoising algorithm, and the performance of the demodulation system is analyzed. In this paper, the demodulation signal is de-noised using the accumulative average algorithm and the wavelet transform algorithm, and the signal before and after denoising is compared. Accumulative average and wavelet transform can suppress noise. (3) Fiber-optic refractive index array sensor is demodulated with a good system, and the liquid refractive index measurement experiment is done. In this paper, a self-calibration structure is proposed to improve the measurement accuracy, and a self-calibration sensor is made. The refractive index sensor in this paper is based on Fresnel reflection type. A 1 脳 8 optical fiber splitter is used to realize the parallel multiplexing of the sensor array, thus the 8 channel simultaneous measurement of the refractive index array sensor is realized. The experimental results show that the sensitivity of the demodulated refractive index sensor is 4.228 MV / RIU.The linearity is about 0.989, and the sensor has good stability and repeatability. Because the demodulation technique proposed in this paper is based on intensity demodulation, it is easy to be interfered by the fluctuation of light source and the vibration of sensing fiber. Therefore, a self-calibration structure is proposed. The self-calibrating structure is to make a sensor with two reflectors, one of which is located in the optical fiber as the reference plane and the other as the measuring plane. The interference of the wave can be eliminated by dividing the reflection intensity of the two reflected signals. The experimental results show that the self-calibration sensor can improve the measurement accuracy from 0.052% to 0.015% and the linearity from 0.9888 to 0.9996.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP212
本文編號：2218751
[Abstract]:Refractive index is an important parameter to characterize liquid properties. Optical fiber refractive index sensor has attracted much attention because of its strong ability to resist electromagnetic interference and miniaturization of probe. It has been widely used in biomedicine and environmental monitoring. Aiming at the problems of complex structure and poor integration of optical fiber refractive index sensor, a kind of optical fiber refractive index array sensor is developed in this paper, which can realize the multi-function of the sensor and solve the problem of cross-sensitivity. A refractive index array sensor demodulation system is built based on microwave demodulation technology, and the system is used to realize refractive index sensor. The main contents of this paper are as follows: (1) the microwave measurement technology of optical carrier is theoretically analyzed, and the feasibility of the technique is verified by simulation. On the basis of theoretical analysis and simulation, a demodulation system for refractive index array sensor is built. (2) the signal is processed by denoising algorithm, and the performance of the demodulation system is analyzed. In this paper, the demodulation signal is de-noised using the accumulative average algorithm and the wavelet transform algorithm, and the signal before and after denoising is compared. Accumulative average and wavelet transform can suppress noise. (3) Fiber-optic refractive index array sensor is demodulated with a good system, and the liquid refractive index measurement experiment is done. In this paper, a self-calibration structure is proposed to improve the measurement accuracy, and a self-calibration sensor is made. The refractive index sensor in this paper is based on Fresnel reflection type. A 1 脳 8 optical fiber splitter is used to realize the parallel multiplexing of the sensor array, thus the 8 channel simultaneous measurement of the refractive index array sensor is realized. The experimental results show that the sensitivity of the demodulated refractive index sensor is 4.228 MV / RIU.The linearity is about 0.989, and the sensor has good stability and repeatability. Because the demodulation technique proposed in this paper is based on intensity demodulation, it is easy to be interfered by the fluctuation of light source and the vibration of sensing fiber. Therefore, a self-calibration structure is proposed. The self-calibrating structure is to make a sensor with two reflectors, one of which is located in the optical fiber as the reference plane and the other as the measuring plane. The interference of the wave can be eliminated by dividing the reflection intensity of the two reflected signals. The experimental results show that the self-calibration sensor can improve the measurement accuracy from 0.052% to 0.015% and the linearity from 0.9888 to 0.9996.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP212
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