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1 – 6 of 6Zi Guo, Fenghong Chu, Jinyu Fan, Ze Zhang, Zhenglan Bian, Gaofang Li and Xiaojun Song
The purpose of this paper is to propose and optimize plastic optical fiber (POF) probe with macro-bending biconical tapered structure for the relative humidity (RH) sensing.
Abstract
Purpose
The purpose of this paper is to propose and optimize plastic optical fiber (POF) probe with macro-bending biconical tapered structure for the relative humidity (RH) sensing.
Design/methodology/approach
In this study, the principle is the evanescent wave power modulated by the ambient humidity. The probe is fabricated by using fused biconical taper and heat-setting method and then coated with a fluorescent moisture-sensitive film.
Findings
The probe’s sensing performance can be optimized by changing the probe’s curvature radius, biconical tapered transition length and taper waist diameter. The result shows that the sensitivity of the probe is up to 1.60 and 3.40 mV/ per cent, respectively, at low humidity (10-45 per cent) and high humidity (45-90 per cent). Also, this probe has good linearity, repeatability, photostability and long-term stability.
Practical implications
The proposed probe can improve the sensitivity and linearity of RH sensing without complex devices, which is necessary for mass production, remote measurement and convenient operation.
Originality/value
POF probe with macro-bending biconical tapered structure is investigated in this paper, which is proved to be effective in improving the sensitivity and linearity.
Details
Keywords
It is important to monitor wrist four direction movements (flexion, extension, adduction and abduction) for hand healthcare, wrist rehabilitation and upper limb exercise, and so…
Abstract
Purpose
It is important to monitor wrist four direction movements (flexion, extension, adduction and abduction) for hand healthcare, wrist rehabilitation and upper limb exercise, and so on. The purpose of this study is to develop a quadri-directional optical bending sensor that integrated wearable device technology in a smart glove to detect wrist four direction movements.
Design/methodology/approach
The quadri-directional optical bending sensor was designed with a microcontroller board, a Bluetooth wireless module, a side-emitting polymeric optical fibre (POF), an infrared light emitting diode and four phototransistors. A linear equation was deduced to calculate bending angle from detecting sensor value of Arduino microcontroller. The bending angle values could be seen by the smartphone screen, so the system has a good human–machine interface function.
Findings
The light emission by macro-bending of the side-emitting POFs that the transmittance of the outer side is greater than the inner. The bending POFs lateral emission phenomenon integrated with phototransistors on the edge is suitable for the development of bending sensors.
Originality/value
This study is to develop a novel quadri-directional optical bending sensor to replace two bi-direction sensors or four uni-direction sensors for wrist four direction movements monitoring.
Details
Keywords
The purpose of this article is to develop a smart illuminated polymeric optical fibre (POF) chameleonic garment, using a wearable device technology for camouflage or safety…
Abstract
Purpose
The purpose of this article is to develop a smart illuminated polymeric optical fibre (POF) chameleonic garment, using a wearable device technology for camouflage or safety warnings based on user needs.
Design/methodology/approach
This study integrates the theory of the optical foundation, control system, wireless communication, program development and apparel design into a chameleonic garment, displaying some vests, bags and shoes.
Findings
After selecting a pixel in the photo taken by the smart phone, the four modes of the application developed in this study are used to change the POF colour of the garment.
Originality/value
This study develops four modes of smart phone application; picked mode: picks a pixel colour on a smart phone canvas, contrastive mode: transfers to contrastive colour of the picked pixel, customized mode – gives input colour number manual and random mode – it based on a system random number. When users have different functional requirements, the four modes provide various choices.
Details
Keywords
The purpose of this paper is to compare the sensing characteristics of uniform fiber Bragg grating (FBG) and tilted fiber Bragg grating (TFBG) by presenting a detailed research…
Abstract
Purpose
The purpose of this paper is to compare the sensing characteristics of uniform fiber Bragg grating (FBG) and tilted fiber Bragg grating (TFBG) by presenting a detailed research review. Temperature, axial strain, bending, vibration and refractive index measurands of FBG and TFBG sensor are presented and some significant differences are found.
Design/methodology/approach
Theoretical analysis and practical application in engineering are investigated and compared from other authors' research papers and self analysis. Spectra behavior of both FBG and TFBG are discussed.
Findings
There are found to be significant differences in temperature, axial strain, bending, vibration and refractive index sensing characteristics of FBG and TFBG.
Originality/value
The paper's analysis is comprehensive and clear and provides readers with the sensing characteristics of FBG and TFBG in detail.
Details
Keywords
Jianxing Gu, Chen Yu, ZhenZe Yang, Peng Xue, Ning Jing and Saimei Yan
This study aims to optimize the structure of gold-sputtered U-shaped plastic fiber sensors.
Abstract
Purpose
This study aims to optimize the structure of gold-sputtered U-shaped plastic fiber sensors.
Design/methodology/approach
A group of U-shaped Au-sputtered plastic optical fiber sensing probes with polishing angles of 45°, 90° and 135° is prepared.
Findings
The experimental results show that the spectral response and sensitivity of the sensor at 45°polishing angle is twice that of the sensor at 90°.
Research limitations/implications
Due to the limitations of laboratory temperature and equipment, the overall effect has not reached the ideal, but the expected effect has been obvious. Experiments also optimize the sensor.
Practical implications
Optical fiber sensing has always been an indispensable part of various fields.
Social implications
Sensor optimization is of great help to the progress of technology and the development of science and technology.
Originality/value
The authors have no conflicts of interest to disclose.
Details
Keywords
This paper aims to propose a liquid level sensor with a multi-S-bend plastic optical fiber.
Abstract
Purpose
This paper aims to propose a liquid level sensor with a multi-S-bend plastic optical fiber.
Design/methodology/approach
The principle of liquid sensing used is based on the leakage of higher modes out of the fiber and repeated regeneration in the following bend sections. Therefore, a propagation loss was introduced in every bend section of the fiber with the loss depending on the refractive index of the environment.
Findings
Therefore, a continue shift in the liquid level can be detected by observing changes in the propagation loss of the fiber. The sensor features compactness and a flexible resolution.
Originality/value
Compared with the exited ones, the sensor has capability of continue liquid measurement and a greater measurement range.
Details