<title>Fiber optic technique for relative humidity sensors</title>

Abstract The corrosion responses of a fiber-optic transceiver’s housing with zinc alloy die casting material are investigated in this study. Emphasis is placed on the determination of the weight change and corrosion rate of the housing when it is subjected to a 85% relative humidity and 85°C temperature (85%RH/85°C) test condition. Also, the average light optical power, receiver sensitivity, extinction ratio, and mask margin of transceiver modules subjected to 85%RH/85°C and 3.47V at 500, 1000, 1500, and 1600 hours are provided. Furthermore, metallography is performed on the surfaces and cross sections of the housing. Finally, measurements are made of the thickness of the oxide layer on the surfaces of the fiber-optic transceiver housing.

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Monitoring relative humidity in RPC detectors by use of fiber optic sensors

Journal of Instrumentation ◽

10.1088/1748-0221/8/03/t03003 ◽

2013 ◽

Vol 8 (03) ◽

pp. T03003-T03003 ◽

Cited By ~ 6

Author(s):

M A Caponero ◽

A Polimadei ◽

L Benussi ◽

S Bianco ◽

S Colafranceschi ◽

...

Keyword(s):

Relative Humidity ◽

Fiber Optic ◽

Fiber Optic Sensors

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Relative Humidity Sensors Based on Microfiber Knot Resonators—A Review

Sensors ◽

10.3390/s19235196 ◽

2019 ◽

Vol 19 (23) ◽

pp. 5196 ◽

Cited By ~ 3

Author(s):

Young-Geun Han

Keyword(s):

Relative Humidity ◽

High Sensitivity ◽

Physical Parameters ◽

Humidity Sensors ◽

Coating Materials ◽

High Q ◽

Sensing Applications ◽

Compact Size ◽

The Many ◽

Humidity Sensitivity

Recent research and development progress of relative humidity sensors using microfiber knot resonators (MKRs) are reviewed by considering the physical parameters of the MKR and coating materials sensitive to improve the relative humidity sensitivity. The fabrication method of the MKR based on silica or polymer is briefly described. The many advantages of the MKR such as strong evanescent field, a high Q-factor, compact size, and high sensitivity can provide a great diversity of sensing applications. The relative humidity sensitivity of the MKR is enhanced by concerning the physical parameters of the MKR, including the waist or knot diameter, sensitive materials, and Vernier effect. Many techniques for depositing the sensitive materials on the MKR surface are discussed. The adsorption effects of water vapor molecules on variations in the resonant wavelength and the transmission output of the MKR are described regarding the materials sensitive to relative humidity. The sensing performance of the MKR-based relative humidity sensors is discussed, including sensitivity, resolution, and response time.

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Chlorinated holey double-walled carbon nanotubes for relative humidity sensors

Carbon ◽

10.1016/j.carbon.2019.04.010 ◽

2019 ◽

Vol 148 ◽

pp. 413-420 ◽

Cited By ~ 8

Author(s):

L.G. Bulusheva ◽

V.I. Sysoev ◽

E.V. Lobiak ◽

Yu.V. Fedoseeva ◽

A.A. Makarova ◽

...

Keyword(s):

Carbon Nanotubes ◽

Relative Humidity ◽

Humidity Sensors ◽

Double Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

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Principles and Applications of Ceramic Humidity Sensors

Active and Passive Electronic Components ◽

10.1155/1994/91016 ◽

1994 ◽

Vol 16 (2) ◽

pp. 69-87 ◽

Cited By ~ 20

Author(s):

Mario Pelino ◽

Carlo Cantalini ◽

Marco Faccio

Keyword(s):

Impedance Spectroscopy ◽

Relative Humidity ◽

Response Time ◽

State Of The Art ◽

The State ◽

Experimental Techniques ◽

Humidity Sensors ◽

Temperature Range ◽

Si Doped ◽

Signal Response

This paper presents a brief review of the state of the art in humidity and gas ceramic sensors R&D; it also describes the principle, fabrication and application of the humidity-sensitive Si-doped a-hematite (α-Fe2O3) sintered compacts. The humidity signal response is characterized by volt-amperometric and impedance spectroscopy techniques in the 0-97% relative humidity (RH) range. The response time of the sensor is evaluated by 0-60% RH variations. Experimental techniques used to measure the hysteresis, drift, and aging of the humidity setasor are presented and the results are discussed. The CO sensitivity is investigated by activating the sensor in the 350-450℃ temperature range. A humidity-meter prototype, based on the α-Fe2O3ceramic compact is described, and its electronics and features are presented in this paper.

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Effect of Ceramsite Prewetting Degree on the Internal Relative Humidity of Ceramsite Concrete

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.94-96.1451 ◽

2011 ◽

Vol 94-96 ◽

pp. 1451-1455

Author(s):

Cai Yi Chen ◽

Tao Ji ◽

Yong Bo Chen ◽

Yong Ning Liang

Keyword(s):

Relative Humidity ◽

Water Absorption ◽

Pressure Measurement ◽

Humidity Sensors ◽

Measurement Device ◽

Desorption Process ◽

Reservoir Function ◽

Internal Relative Humidity

The water absorption and desorption process of different prewetting degree ceramsites embedded in ceramsite concrete was obtained by a U-tube micro pressure measurement device. The internal relative humidities of ceramsite concrete using different prewetting degree ceramsites were monitored by humidity sensors. The study reveals that, with the increase of ceramsite prewetting degree, the internal relative humidity of ceramsite concrete increases because the reservoir function of ceramsite is more obvious.

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