Centro de Investigaciones en Optica, Loma del Bosque 115, Col. Lomas del Campestre, Leon, Guanajuato, 37150, Mexico.
Sensors (Basel). 2012;12(1):415-28. doi: 10.3390/s120100415. Epub 2012 Jan 4.
A micro-displacement sensor consisting of a fiber-loop made with a tapered fiber is reported. The sensor operation is based on the interaction between the fundamental cladding mode propagating through the taper waist and higher order cladding modes excited when the taper is deformed to form a loop. As a result, a transmission spectrum with several notches is observed, where the notch wavelength resonances shift as a function of the loop diameter. The loop diameter is varied by the spatial displacement of one end of the fiber-loop attached to a linear translation stage. In a displacement range of 3.125 mm the maximum wavelength shift is 360.93 nm, with 0.116 nm/μm sensitivity. By using a 1,280 nm broadband low-power LED source and a single Ge-photodetector in a power transmission sensor setup, a sensitivity in the order of 2.7 nW/μm is obtained in ≈ 1 mm range. The proposed sensor is easy to implement and has a plenty of room to improve its performance.
本文报道了一种由锥形光纤构成的光纤环微位移传感器。该传感器的工作原理基于通过锥形光纤腰部传输的基模与高阶包层模之间的相互作用，当锥形光纤发生变形形成光纤环时，高阶包层模被激发。结果，观察到具有多个陷波的传输光谱，其中陷波波长共振随环直径的变化而移动。通过将光纤环的一端附着在直线平移台上，可以改变环的直径。在 3.125mm 的位移范围内，最大波长移动为 360.93nm，灵敏度为 0.116nm/μm。在功率传输传感器设置中，使用 1280nm 宽带低功率 LED 源和单个 Ge 光电探测器，在 ≈1mm 的范围内可以获得约 2.7nW/μm 的灵敏度。所提出的传感器易于实现，并且有很大的改进空间来提高其性能。
