idAbstract. The road damage due to excessive load is one of the causes of accidents on the road. A device to measure weight of the passing vehicles needs to be planted in the road structure. Thus, a weight sensor for the passing vehicles is required. In this study, we designed a weight sensor for a static load based on a power loss due to a micro bending on the optical fiber flanked on a board. The following main components are used i.e. LED 1310 nm as a light source, a multimode fiber optic as a transmission media and a power meter for measuring power loss. This works focuses on obtaining a suitable deformer design for weight sensor. Experimental results show that deformer design with 1.5 mm single side has level of accuracy as 4.32% while the design with 1.5 mm double side has level of accuracy as 98.77%. Increasing deformer length to 2.5 mm gives 71.18% level of accuracy for single side, and 76.94% level of accuracy for double side. Micro bending design with 1.5 mm double side has a high sensitivity and it is also capable of measuring load up to 100 kg. The sensor designed has been tested for measuring the weight of motor cycle, and it can be upgraded for measuring heavy vehicles.
A standard telecommunication-grade single-mode optical fiber is designed to have a low macro-bending loss in its entire operating wavelengths to comply with the ITU-T Recommendation G.652. In this paper, we described the potential use of such a fiber as an intensity-based sensor due to the macro-bending loss as an alternative to using a bendingsensitive fiber. We calculated the macro-bending loss of several single-mode optical fiber patchcords using the classical Marcuse equation at several wavelengths, and measured its transmission loss due to bending using an optical spectrum analyzer. For each type of fibers there is a wavelength with a significant macro-bending loss of the LP 11 mode when the Vnumber of the fiber lies between 2.4 and 4, and that of the LP 01 mode when the V-number of the fiber lies between 1 and 2.4. This work shows a thorough mathematical and experimental analysis for the posibility in using standard telecommunication fibers for intensity based-fiber sensor taking the benefit of bending loss phenomenon using commercial light sources.
Sensor strain digunakan untuk mengukur perubahan strain akibat stress pada suatu bahan. Dalam penelitian ini, telah dirancang sensor strain menggunakan fiber optik dari bahan dielektris plastik dengan teknik pencacatan. Teknik yang dipakai adalah untuk melihat perubahan intensitas cahaya yang terdeteksi sebagai akibat dari stress yang diterima fiber optik. Pengamatan dalam perancangan sensor fiber optik menggunakan PC mikroskop sehingga struktur permukaan fiber yang kecil dan halus dapat terlihat. Untuk mengetahui besaran strain akibat stress yang terukur dibutuhkan sumber cahaya laser, fotodetektor, rangkaian amplifier, modul akuisisi data (DAQ) dan PC. Evaluasi hasil perancangan sensor dilakukan dengan uji tarik (tensile) fiber optik yang diletakkan pada spesimen menggunakan mesin universal tensile meter (UTM).
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