scholarly journals Imaging-based optical barcoding for relative humidity sensing based on meta-tip

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Yin Liu ◽  
Xiaowei Li ◽  
Yufeng Chen ◽  
Guangzhou Geng ◽  
Junjie Li ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Reflection Spectrum ◽  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Semiconductor Chip ◽  
Wide Range ◽  
Path Distance ◽  
Spr Effect ◽  
Processing And Storage ◽  
Human Eyes

Abstract In a wide range of applications such as healthcare treatment, environmental monitoring, food processing and storage, and semiconductor chip manufacturing, relative humidity (RH) sensing is required. However, traditional fiber-optic humidity sensors face the challenges of miniaturization and indirectly obtaining humidity values. Here, we propose and demonstrate an optical barcode technique by cooperating with RH meta-tip, which can predict the humidity values directly. Such RH meta-tip is composed of fiber-optic sensor based on surface plasmon resonance (SPR) effect and graphene oxide film as humidity sensitizer. While SPR sensor is composed of multimode fiber (MMF) integrated with metallic metasurface. Dynamic time warping (DTW) algorithm is used to obtain the warp path distance (WPD) sequence between the measured reflection spectrum and the spectra of the precalibrated database. The distance sequence is transformed into a pseudo-color barcode, and the humidity value is corresponded to the lowest distance, which can be read by human eyes. The RH measurement depends on the collective changes of the reflection spectrum rather than tracking a single specific resonance peak/dip. This work can open up new doors to the development of a humidity sensor with direct RH recognition by human eyes.

scholarly journals Fiber optic humidity sensor based on silk fibroin interference films

2020 ◽  
Vol 12 (2) ◽  
pp. 49
Author(s):  
Zbigniew Opilski ◽  
Marcin Procek ◽  
Salvador Aznar-Cervantes ◽  
Jose Cenis ◽  
Xavier Munoz
Keyword(s):  
Relative Humidity ◽  
Optical Fibers ◽  
Silk Fibroin ◽  
Humidity Sensor ◽  
Fiber Optic ◽  
Dip Coating ◽  
Fiber Optic Sensor ◽  
Light Sources ◽  
Simple Method ◽  
Humidity Sensing

The article presents an inexpensive and simple method of fiber optic interference relative humidity (RH) sensors based on silk fibroin (SF) films. The sensors were made on standard multimode telecommunications optical fibers using dip-coating method and examined using broadband light sources. The measuring stand at which the basic sensor parameters were measured and the measured parameters were presented. Full Text: PDF ReferencesY.-G. Han, "Relative Humidity Sensors Based on Microfiber Knot Resonators—A Review", Sensors, 19(23), 5196 (2019) CrossRef L.D. Koh, Y. Cheng, C. P. Teng, Y. W. Khin, X. J. Loh, S. Y. Tee, et al., "Structures, mechanical properties and applications of silk fibroin materials", Prog. Polim. Sci. 46, 86-110 (2015) CrossRef H. Tao, D. L. Kaplan, F. G. Omenetto, "Silk Materials – A Road to Sustainable High Technology", Adv. Mater., 24, 2824-2837 (2012), CrossRef Q. Li, N. Qi, Y. Peng, Y. Zhang, L. Shi, X. Zhang, et al., "Sub-micron silk fibroin film with high humidity sensibility through color changing", RSC Adv. 7(29), 17889-17897 (2017) CrossRef S.K. Hwan, H.C. Sung, B. Roy, S. Kim, Y.H. Ahn, "Humidity sensing using THz metamaterial with silk protein fibroin", Opt. Express 26(26), 33575-33581 (2018) CrossRef M. Procek, Z. Opilski, A. M. Maqueda, X. M. Berbel, S. D. Aznar-Cervantes, J. L. Cenis, C. D. Horna, "Silk fibroin thin films for optical humidity sensing", Proc. SPIE , 11204, 0277-786X, (2019). CrossRef Y. Luo, Y. Pei, X. Feng, B. Lu, L. Wang, "Silk fibroin based transparent and wearable humidity sensor for ultra-sensitive respiration monitoring", Mater. Lett., 260, 126945 (2020) CrossRef E. Maciak, "Low-Coherence Interferometric Fiber Optic Sensor for Humidity Monitoring Based on Nafion® Thin Film†", Sensors 19(3), 629 (2019) CrossRef

scholarly journals Wide Range Fiber Displacement Sensor Based on Bending Loss

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Jinlei Zhao ◽  
Tengfei Bao ◽  
Tribikram Kundu
Keyword(s):  
Fiber Optic ◽  
Dynamic Range ◽  
Glass Fibers ◽  
Fiber Optic Sensor ◽  
Sensor System ◽  
Displacement Sensor ◽  
Optic Sensor ◽  
Wide Range ◽  
Crack Monitoring ◽  
Fiber Loop

A wide range fiber optic sensor system for displacement and crack monitoring is developed. In the proposed fiber optic sensor system, a number of fiber loops are formed from a single fiber and each fiber loop is used as a crack or displacement sensor. The feasibility and the dynamic range of the fiber sensor developed in this manner are investigated experimentally. Both glass fibers and plastic fibers are used in the experiments. Experimental results show that the new fiber optic sensor has a wide range (maximum range is 88 mm) and this sensor also has a high sensitivity for displacement and crack monitoring when an appropriate diameter of the fiber loop is selected as the sensor. Moreover, the proposed method is very simple and has low cost, so in situ application potential of the proposed sensor is high.

scholarly journals Graphene-Oxide-Coated Long-Period Grating-Based Fiber Optic Sensor for Relative Humidity and External Refractive Index

2018 ◽  
Vol 36 (4) ◽  
pp. 1145-1151 ◽  
Author(s):  
Kasun Prabuddha Wasantha Dissanayake ◽  
Weiping Wu ◽  
Hien Nguyen ◽  
Tong Sun ◽  
Kenneth T. V. Grattan
Keyword(s):  
Refractive Index ◽  
Graphene Oxide ◽  
Relative Humidity ◽  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Long Period Grating ◽  
Long Period ◽  
Optic Sensor

scholarly journals Address Fiber Optical Sensor for Relative Humidity Measuring in a Switchgear

2020 ◽  
pp. 1-16
Author(s):  
Rin. Sh. Misbakhov ◽  
A. N. Vasev ◽  
A. Zh. Sakhabutdinov ◽  
I. I. Nureev ◽  
O. G. Morozov ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Optical Networks ◽  
Fiber Optic ◽  
Layer Structure ◽  
Broad Class ◽  
Bragg Gratings ◽  
Fiber Optic Sensors ◽  
Parallel Structure ◽  
Wide Range ◽  
On Line

A number of governing documents and by-laws of the Russian Federation, branch ministries, departments and companies have introduced the use of measuring relative air humidity, elements insulation, and SF6 into operation and maintenance process of complete switchgear. A wide range of high-precision laboratory instruments has been developed to implement these measurements. However, as a rule, these are scheduled measurements to be carried out once or twice a quarter, although the constant on-line monitoring of humidity is concerned in both the production and scientific circles of the energy industry. The possibility of on-line monitoring appeared with the advent of fiber-optic object-based passive networks for collecting information and the possibility of forming interrogation channels in them, which is provided for by the development of the Smart Grid Plus concept. Fiber optic sensors, single in their physical layer structure with passive optical networks, are highly robust and resistant to high electromagnetic fields, typical of those generated in a switchgear, and are designed to operate in harsh environments. Among their broad class, fiber optic sensors on Bragg gratings, which differ from others by direct measurement methods, have significant advantages. In particular, an increase or decrease in relative humidity will lead to a corresponding change in the wavelength of the sensing source reflected from the grating, which can be measured with an accuracy of sixth place from its absolute value.This paper proposes to consider a two-element sensor of relative humidity of a parallel structure, which differs from the existing ones by using address fiber Bragg gratings made in SMF-28 fiber. One of the gratings has a polyimide-replaced quartz shell, synthesized using a reductant fiber coating, and a completely multiplicative response to temperature and deformation caused by humidity. The second grating is recorded in a standard fiber and responds only to temperature. It is possible to include an additional third grating with a partially etched cladding, which can be used for refract metric measurements of the amount of condensed moisture on the elements of a complete switchgear. All the gratings are identical, have, as a rule, the same Bragg wavelength after manipulating their claddings, but they have differing unique addresses, which are formed by recording two transparency windows in each of the gratings with different difference frequency space. The transparency windows correspond to phase p-shifts symmetrically located at the same distance from the center of each grating. The structure obtained makes it possible to record information of the measurement conversion at the said difference frequencies in the radio range, which significantly increases the speed of relative humidity measurements and their accuracy by an order of magnitude more. In addition to what has been said, it is possible to note the capability for building a network of these sensors in series arranged in switchgear devices, with a different radiofrequency address group being used in each of them.

scholarly journals Sensitivity Enhancement of Curvature Fiber Sensor Based on Polymer-Coated Capillary Hollow-Core Fiber

Sensors ◽  
2020 ◽  
Vol 20 (13) ◽  
pp. 3763 ◽  
Author(s):  
Luis A. Herrera-Piad ◽  
Iván Hernández-Romano ◽  
Daniel A. May-Arrioja ◽  
Vladimir P. Minkovich ◽  
Miguel Torres-Cisneros
Keyword(s):  
Fiber Optic ◽  
High Sensitivity ◽  
Single Mode ◽  
Cost Effective ◽  
Fiber Optic Sensor ◽  
Hollow Core ◽  
Sensing Applications ◽  
Optic Sensor ◽  
Wide Range ◽  
Core Fiber

In this paper, we propose and experimentally demonstrate a simple technique to enhance the curvature sensitivity of a bending fiber optic sensor based on anti-resonant reflecting optical waveguide (ARROW) guidance. The sensing structure is assembled by splicing a segment of capillary hollow-core fiber (CHCF) between two single-mode fibers (SMF), and the device is set on a steel sheet for measuring different curvatures. Without any surface treatment, the ARROW sensor exhibits a curvature sensitivity of 1.6 dB/m−1 in a curvature range from 0 to 2.14 m−1. By carefully coating half of the CHCF length with polydimethylsiloxane (PDMS), the curvature sensitivity of the ARROW sensor is enhanced to −5.62 dB/m−1, as well as an increment in the curvature range (from 0 to 2.68 m−1). Moreover, the covered device exhibits a low-temperature sensitivity (0.038 dB/°C), meaning that temperature fluctuations do not compromise the bending fiber optic sensor operation. The ARROW sensor fabricated with this technique has high sensitivity and a wide range for curvature measurements, with the advantage that the technique is cost-effective and easy to implement. All these features make this technique appealing for real sensing applications, such as structural health monitoring.

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