Study of macro-bending biconical tapered plastic optical fiber for relative humidity sensing

Guo, Zi Hao; Chu, Fenghong; Fan, Jinyu; Zhang, Ze; Bian, Zhenglan; Li, Gaofang; Song, Xiaojun

doi:10.1108/sr-03-2018-0058

Cited by 11 publications

(7 citation statements)

References 14 publications

(19 reference statements)

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“…At the same time, the residual solvent on the fiber surface can change the properties of the fiber material and thus affect the subsequent application. The heat-and-pull technique can be used to form a cladding POF taper [15,16]. The cladding of a taper remains and the damage to the robustness is small.…”

Section: Introductionmentioning

confidence: 99%

Ethanol Gas Sensitivity Sensor Based on Roughened POF Taper of Modified Polypyrrole Films

Liu

Hou

2020

Sensors

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The three polypyrrole (PPy) films with different mixture ratios, namely PPy1, PPy2, and PPy3, were synthesized by chemical oxidation with pyrrole and ferric chloride (FeCl3). The roughened plastic optical fiber (POF) taper assembled PPy films (POF-PPy1, POF-PPy2, and POF-PPy3) were facilely prepared and bent U shape structure for testing ethanol gas at room temperature. The morphologies of the PPy films and the roughened POF taper were studied using electron microscopy. The effect of the three PPy films on the gas response was investigated and the results showed that the POF-PPy2 exhibited a high sensitivity of 5.08 × 10−5 dB/ppm. The detection limit of the sensor was 140 ppm and its response and recovery times were 5 s and 8 s, respectively. The results also showed that as the bending radius decreased, the response and recovery times gradually shortened, while the output power increased. In addition, the proposed sensor has advantages of a low cost and simple structure.

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Section: Introductionmentioning

confidence: 99%

Ethanol Gas Sensitivity Sensor Based on Roughened POF Taper of Modified Polypyrrole Films

Liu

Hou

2020

Sensors

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“…The bending losses of POF were investigated simulatively and experimentally in numerous studies in the past [40,42,46,[92][93][94][95][96]. For POF sensing, bending losses can be used as a feature, e.g., when it comes to measuring displacement [97], deformation [98], strain [99], pressure [100], weight [101], humidity [102], refractive index [95], breathing rate [103] or bending itself [104], among others, or to increase the penetration depth of evanescent waves [105] in other sensing applications.…”

Section: Bendingmentioning

confidence: 99%

An Overview on Methods for Producing Side-Emitting Polymer Optical Fibers

et al. 2021

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An overview of the most important methods for producing side-emitting polymer optical fibers is given. Based on a systematic literature and patent search, the methods that are applied in practice and explored in research are identified. The fabrication methods are classified into four groups according to the physical phenomenon that hinders total internal reflection: bulk scattering, bending, surface perforations and luminescence. Subdivisions are made regarding the actual processing steps. The production methods are described in detail and discussed with respect to their customizability and applications.

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“…Humidity measurement using optical fibers (OF) is a potential alternative as it has many advantages, such as small size [11,12], bio-compatible [13], has remote sensing ability [4], free of electromagnetic interference [2], and can withstand impacts and vibrations [14]. In general, there are 2 types of OF, viz.…”

Section: Introductionmentioning

confidence: 99%

“…The bending may be circular with certain diameter and/or smaller (local) bent forms known as macro-and micro bendings, respectively. Macro bending the POF has been utilized as the sensing element for humidity sensors, e.g., see [15,17,18] via producing power loss upon the POF.…”

Section: Introductionmentioning

confidence: 99%

Increasing the Sensitivity of Polymer Optical Fiber Sensing Element in Detecting Humidity: Combination of Macro and Micro Bendings

2022

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Humidity sensing is essential in various fields, including industrial processes, agriculture, engineering, and health. A material suitable as a sensing element for humidity detecting is polymer optical fiber (POF). In this study, a combination of micro and macro bendings was proposed to increase the sensitivity of the sensing element. The sensing element was constructed by peeling the out-most coating of the POF, but keeping intact the cladding and core. The macro bending was done upon the peeled part of the POF by making a circular form with varying diameter of 3.5, 4.0 and 4.5 cm. The micro bending was constructed by making a local bent via subjecting to electrical discharge flame from an inductor generator with varying number of micro bendings, i.e., 1, 2 and 3. The sensing element was then tested for its sensitivity as a humidity sensor. The sensing element was positioned inside a self-custom made humidity measurement box consisting of a hygrometer and a pipe to stream water vapor inside the box. The normalized power was measured by varying the % humidity inside the box. In general, the result showed that increasing the humidity caused the normalized lupower to decrease, hence increasing the power loss of the sensing element. Moreover, the sensitivity of the sensing element was increased 10 times for the combined micro and macro bendings compared to a sensing element without micro bendings. HIGHLIGHTS In this study, we increase the sensitivity of a polymer optical fiber (POF) sensing element via a combination of micro and macro bendings. The sensing element is constructed by peeling the out-most coating of the POF, but keeping the cladding and core The macro bending is done upon the peeled part of the POF in a circular form. The micro bending is constructed by making a local bent via subjecting to electrical discharge flame from an inductor generator The sensing element is then tested for its sensitivity as a humidity sensor. The sensing element is put inside a self-custom made humidity box. The normalized power was measured by varying the % humidity inside the box The result shows that increasing the humidity causes the normalized power to decrease, hence increasing the power loss of the sensing element. Moreover, the sensitivity of the sensing element is increased 10 times for the combined micro and macro bendings compared to a sensing element without micro bendings GRAPHICAL ABSTRACT

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Study of macro-bending biconical tapered plastic optical fiber for relative humidity sensing

Cited by 11 publications

References 14 publications

Ethanol Gas Sensitivity Sensor Based on Roughened POF Taper of Modified Polypyrrole Films

Ethanol Gas Sensitivity Sensor Based on Roughened POF Taper of Modified Polypyrrole Films

An Overview on Methods for Producing Side-Emitting Polymer Optical Fibers

Increasing the Sensitivity of Polymer Optical Fiber Sensing Element in Detecting Humidity: Combination of Macro and Micro Bendings

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