【摘要】：提出一種基于馬赫-曾德爾干涉的球形結(jié)構(gòu)光纖溫度傳感器。該傳感器通過在單模光纖上熔接兩個球形結(jié)構(gòu)形成球形-單模-球形結(jié)構(gòu)的馬赫-曾德爾干涉儀。外界溫度的變化會引起光纖包層模的有效折射率變化,從而導(dǎo)致干涉光譜的變化,通過檢測干涉谷的特征波長漂移量,實(shí)現(xiàn)對溫度的測量。實(shí)驗(yàn)結(jié)果表明,在溫度變化范圍為18~78℃時,當(dāng)中間單模光纖長度為1.8cm時,傳感器的靈敏度為0.129 7nm/℃,當(dāng)中間單模光纖長度為2.4cm時,傳感器靈敏度為0.121 4nm/℃,當(dāng)中間單模光纖長度為4.0cm時,傳感器靈敏度為0.070 4nm/℃。根據(jù)0.01nm的波長分辨率,該傳感器可以實(shí)現(xiàn)溫度的分辨率為0.077 1℃。該球形結(jié)構(gòu)的光纖溫度傳感器靈敏度高、結(jié)構(gòu)緊湊、制作簡單、成本低廉,在溫度檢測方面具有良好的應(yīng)用前景。
[Abstract]:A spherical optical fiber temperature sensor based on Mach-Zehnder interference is proposed. The sensor is fused to two spherical structures on a single mode fiber to form a mach-Zehnder interferometer with a spherical-single-mode-spherical structure. The change of external temperature will cause the change of the effective refractive index of the cladding mode of the fiber, which will lead to the change of the interference spectrum. The temperature can be measured by detecting the characteristic wavelength drift of the interference valley. The experimental results show that the sensitivity of the sensor is 0.129 7nm/ 鈩，

本文編號：2406016