同時測量溫度和折射率的光纖傳感器
發(fā)布時間：2018-09-11 21:47
【摘要】：提出了一種基于馬赫-曾德干涉儀(MZI)的溫度與折射率同步測量的光纖傳感器。本文傳感器結(jié)構(gòu)由兩個球形結(jié)構(gòu)級聯(lián)一個錐結(jié)構(gòu)組成,球形結(jié)構(gòu)激發(fā)高階包層模,錐結(jié)構(gòu)擴(kuò)大了倏逝場穿透深度范圍。其原理是當(dāng)纖芯中傳輸?shù)墓馔ㄟ^第1個球形結(jié)構(gòu)時,一部分光進(jìn)入包層中傳輸形成包層模,另一部分光繼續(xù)在纖芯中傳輸形成纖芯模,由于纖芯與包層具有不同的折射率,因而纖芯模和包層模之間產(chǎn)生光程差,當(dāng)兩部分光到達(dá)另一端的球形結(jié)構(gòu)時,在包層中傳輸?shù)墓怦詈线M(jìn)入纖芯,從而與纖芯中傳輸?shù)墓庠诹硪磺虺錾涮幇l(fā)生干涉,當(dāng)外界環(huán)境(如溫度、折射率等)發(fā)生改變,影響光程差,則干涉譜也將隨之改變。實驗結(jié)果表明,本文傳感器結(jié)構(gòu)的透射譜中,干涉峰對溫度和折射率具有不同的響應(yīng)靈敏度,因此可以利用矩陣法實現(xiàn)對溫度和折射率的同步測量。在10~100℃和1.343 2~1.402 6RIU(refractive index unity)的測量范圍內(nèi),強(qiáng)度解調(diào)可以達(dá)到約0.22℃和1×10~(-4) RIU溫度和折射率分辨率。同時發(fā)現(xiàn),波長解調(diào)可以達(dá)到0.37℃溫度分辨率。本文傳感器結(jié)構(gòu)簡單緊湊、成本低,可適用于多領(lǐng)域?qū)崿F(xiàn)溫度和折射率的雙參量同步測量。
[Abstract]:An optical fiber sensor based on (MZI) for simultaneous measurement of temperature and refractive index is proposed. In this paper, the sensor structure is composed of two spherical structures cascade and a cone structure. The spherical structure excites the high-order cladding mode, and the cone structure expands the penetrating depth range of evanescent field. The principle is that when the light in the core passes through the first spherical structure, some of the light flows into the cladding to form the cladding mode, and the other part of the light continues to propagate in the core to form the core mode, because the core and the cladding have different refractive index. Thus, the optical path difference between the core mode and the cladding mode is produced. When the two parts of the light reach the spherical structure at the other end, the light transmitted in the cladding coupling into the core, thus interfering with the light transmitted in the core at the point of the other sphere. When the external environment (such as temperature, refractive index, etc.) changes and affects the optical path difference, the interference spectrum will also change. The experimental results show that the interference peak has different sensitivity to temperature and refractive index in the transmission spectrum of the sensor structure, so the simultaneous measurement of temperature and refractive index can be realized by matrix method. The intensity demodulation can reach about 0.22 鈩，
本文編號：2237949
[Abstract]:An optical fiber sensor based on (MZI) for simultaneous measurement of temperature and refractive index is proposed. In this paper, the sensor structure is composed of two spherical structures cascade and a cone structure. The spherical structure excites the high-order cladding mode, and the cone structure expands the penetrating depth range of evanescent field. The principle is that when the light in the core passes through the first spherical structure, some of the light flows into the cladding to form the cladding mode, and the other part of the light continues to propagate in the core to form the core mode, because the core and the cladding have different refractive index. Thus, the optical path difference between the core mode and the cladding mode is produced. When the two parts of the light reach the spherical structure at the other end, the light transmitted in the cladding coupling into the core, thus interfering with the light transmitted in the core at the point of the other sphere. When the external environment (such as temperature, refractive index, etc.) changes and affects the optical path difference, the interference spectrum will also change. The experimental results show that the interference peak has different sensitivity to temperature and refractive index in the transmission spectrum of the sensor structure, so the simultaneous measurement of temperature and refractive index can be realized by matrix method. The intensity demodulation can reach about 0.22 鈩，
本文編號：2237949
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