Agarose coated macro-bend fiber sensor for relative humidity and temperature measurement at 2 μm

Chen, Weijuan; Chen, Zhihao; Zhang, Yi; Li, Hui; Lian, Yanhui

doi:10.1016/j.yofte.2019.03.007

Cited by 19 publications

(3 citation statements)

References 29 publications

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“…Recently, three publications have reported on humidity sensors working in the 2 µm waveband [24][25][26]. In our recent work, we reported a macro-bend fiber humidity sensor based on the water absorption band at 2 µm [24]. The sensor showed good performance in both humidity and temperature.…”

Section: Introductionmentioning

confidence: 93%

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Fiber sensor for relative humidity measurement in the water absorption band at 2 µm

Chen

Zhang

et al. 2019

Meas. Sci. Technol.

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An optical-fiber sensor based on a Mach-Zehnder interferometer is proposed and experimentally demonstrated for relative humidity (RH) measurement in the water absorption band at 2 µm. The sensor head is formed by a dual biconical fiber coated with agarose gel. Both the simulation and experimental results show that the proposed sensor is more sensitive to refractive index in the 2 µm waveband compared with the 1.5 µm waveband. Furthermore, we applied the sensor for humidity sensing. The results show that the sensor is very sensitive to humidity due to strong water absorption and weaker field confinement in the fiber core in the 2 µm waveband. The sensitivity achieved in our experiment was 231 pm/% RH, which was 3.5 times higher than for that sensor at 1.5 µm.

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Section: Introductionmentioning

confidence: 93%

“…Firstly, there is a strong water absorption in the 2 µm waveband [23]. Recently, three publications have reported on humidity sensors working in the 2 µm waveband [24][25][26]. In our recent work, we reported a macro-bend fiber humidity sensor based on the water absorption band at 2 µm [24].…”

Section: Introductionmentioning

confidence: 96%

Fiber sensor for relative humidity measurement in the water absorption band at 2 µm

Chen

Zhang

et al. 2019

Meas. Sci. Technol.

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“…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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Optimized convolutional neural network-based temperature and refractive index fiber optic sensor

Geetha,

Chellaswamy,

Kaliraja

2024

J Opt

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Agarose coated macro-bend fiber sensor for relative humidity and temperature measurement at 2 μm

Cited by 19 publications

References 29 publications

Fiber sensor for relative humidity measurement in the water absorption band at 2 µm

Fiber sensor for relative humidity measurement in the water absorption band at 2 µm

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

Optimized convolutional neural network-based temperature and refractive index fiber optic sensor

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Agarose coated macro-bend fiber sensor for relative humidity and temperature measurement at 2 μm

Cited by 19 publications

References 29 publications

Fiber sensor for relative humidity measurement in the water absorption band at 2 µm

Fiber sensor for relative humidity measurement in the water absorption band at 2 µm

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

Optimized convolutional neural network-based temperature and refractive index fiber optic sensor

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Product

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Agarose coated macro-bend fiber sensor for relative humidity and temperature measurement at 2 μm