Humidity sensor using epoxy resin containing quaternary ammonium salts

Lee, Chil‐Won; Rhee, Hee‐Woo; Gong, Myoung‐Seon

doi:10.1016/s0925-4005(00)00668-7

Cited by 78 publications

(16 citation statements)

References 11 publications

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“…Based on functional groups, humidity-sensitive polyelectrolytes can be fundamentally divided into three major categories: quaternary ammonium salts, [105][106][107][108][109][110][111][112][113] sulfonate salts, 114 115 and phosphonium salts. 97 98 116-118 To absorb moisture, the polyelectrolytes are usually prepared as porous thin films.…”

Section: Polyelectrolyte-based Resistive Sensorsmentioning

confidence: 99%

Humidity Sensors: A Review of Materials and Mechanisms

Chen¹,

Lu²

2005

Sen Lett

1,324

708

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We have reviewed humidity sensors based on various materials for both relative and absolute humidity, including ceramic, semiconducting, and polymer materials. In the majority of publications, there are few papers dealing with absolute humidity sensors, which have extensive applications in industry. We reviewed extensively absolute humidity sensors in this article, which is unique comparing with other reviews of humidity sensors. The electrical properties of humidity sensors such as sensitivity, response time, and stability have been described in details for various materials and a considerable part of the review is focused on the sensing mechanisms. In addition, preparation and characterization of sensing materials are also described. For absolute humidity sensors, mirrorbased dew-point sensors and solid-state Al 2 O 3 moisture sensors have been described. As the major problem in Al 2 O 3 moisture sensors, long-term instability, has been solved, -Al 2 O 3 moisture sensors may have promising future in industry.

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Section: Polyelectrolyte-based Resistive Sensorsmentioning

confidence: 99%

Humidity Sensors: A Review of Materials and Mechanisms

Chen¹,

Lu²

2005

Sen Lett

1,324

708

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“…Besides the humidity measurements, moisture measurements also are very important, such as in high voltage engineering for measurements of water content in transformer oils. At present, there are various types of humidity sensors available for humidity or moisture measurements, which can be categorized into capacity, resistive, gravimetric and mechanical types based on the sensing principles used [5,11,30,34]. Most of the humidity sensors need a layer of humidity sensitive material, such as polymers or hydrogels.…”

Section: Introductionmentioning

confidence: 99%

Polyimide-Coated Fiber Bragg Grating Sensors for Humidity Measurements

Wang¹,

Fang²,

Huang³

2012

High Performance Polymers - Polyimides Based - From Chemistry to Applications

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Compared to the conventional mechanical and electrical/electronic humidity sensors, fiber-optic based humidity sensors [6,14], including silica glass fiber and polymer optical fiber (POF) based sensors [28, 46], demonstrate many unique advantages, such as small size and low weight, immunity to electromagnetic interference, corrosion resistance, potentials for remote operation and distributed sensing. In fiber-optic sensor family, the fiber grating

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“…A traditional family of humidity measurement devices are the dew-point sensors [5], particularly psychrometers [6,7]. Recent applications were developed using the properties of polymeric materials [8]. The electric Relative Humidity sensors are nowadays the most diffused, both for their simply use, both for the not expansive cost.…”

Section: Introductionmentioning

confidence: 99%

Optical psychrometer for relative humidity measurement in non-conventional environments

Pirrotta

Guglielmino

2007

Third European Workshop on Optical Fibre Sensors

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The aim of this study has been the introduction and calibration of a novel Relative Humidity meter, based on optical sensors. It consists of a psychrometer, whose temperature measurements are performed by means of two Fiber Bragg Grating sensors, working as dry-bulb and wet-bulb thermometers. Their preliminary calibration permits to convert Bragg wavelengths into temperature values with high repeatability and accuracy: hence, the local relative humidity can be evaluated, using thermal gradient and dew point temperature, by a psychrometric table implemented as analytic function inside a processing algorithm. The proposed sensor presents all the typical advantages of the optical devices, especially the immunity to electromagnetic disturbances and to corrosion, allowing to measure humidity in aggressive environments as meteorological off-shore stations, marine structures and vehicles.

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Humidity sensor using epoxy resin containing quaternary ammonium salts

Cited by 78 publications

References 11 publications

Humidity Sensors: A Review of Materials and Mechanisms

Humidity Sensors: A Review of Materials and Mechanisms

Polyimide-Coated Fiber Bragg Grating Sensors for Humidity Measurements

Optical psychrometer for relative humidity measurement in non-conventional environments

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