Optical Detection of Moisture in Air and in Soil Using Dye-Doped Plastic Fibers

Muto, Shinzo; Fukasawa, Akihiko; Ogawa, Takayuki; Morisawa, Masayuki; Itô, Hiroshi

doi:10.1143/jjap.29.l1023

Cited by 15 publications

(2 citation statements)

References 6 publications

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“…Frequency Domain sensors are much better for humid tropical soil with much easier calibration procedure [4]. Recent development in moisture sensing of soil are with fiber optic sensor [5,6], dye doped plastic fibers [8], ceramic sensor [10] are either too expensive or has reliability issues. Method of measuring soil moisture by neutron scattering [11] cannot be applied practically.…”

Section: Introductionmentioning

confidence: 99%

A Low Cost Portable Temperature-Moisture Sensing Unit With Artificial Neural Network Based Signal Conditioning For Smart Irrigation Applications

Tyagi

Reddy

Singh

et al. 2011

International Journal on Smart Sensing and Intelligent Systems

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The recent trends in developing low cost techniques to support cost effective agriculture in developing countries with large population has motivated the development of low cost sensing systems to provide for low cost irrigation facilities and also to provide for conservation of water at the same time. The current paper highlights the development of temperature and soil moisture sensor that can be placed on suitable locations on field for monitoring of temperature and moisture of soil, the two parameters to which the crops are susceptive. The sensing system is based on a feedback control mechanism with a centralized control unit which regulates the flow of water on to the field in the real time based on the instantaneous temperature and moisture values. Depending on the varied requirement of different crops, a lookup table has been prepared and referred to for ascertaining the amount of water needed by that crop. The system based on a microcontroller has been applied on rice and maize fields spanning over area of 1 acres each for 3 weeks and more than 94% of the

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Section: Introductionmentioning

confidence: 99%

A Low Cost Portable Temperature-Moisture Sensing Unit With Artificial Neural Network Based Signal Conditioning For Smart Irrigation Applications

Tyagi

Reddy

Singh

et al. 2011

International Journal on Smart Sensing and Intelligent Systems

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“…From this background, we made an attempt to develop a plastic-optical-fibre-(POF-) type sensor for detecting leakage of vapour phase alcohol because optical sensing is the safest method [5]. In addition, the POFs have many advantages such as low cost, light weight, high geometrical versatility and immunity to electromagnetic interference [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Untitled

Morisawa

Amemiya

Kohzu

et al. 2001

Meas. Sci. Technol.

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New plastic optical fibre sensors for detecting alcohol vapour have been studied. A certain kind of polymer such as a Novolac resin causes swelling when it is exposed to alcohol vapour. This effect produces a change in the polymer refractive index. Based on this principle, the plastic optical fibre (POF) type sensor head was fabricated by coating Novolac-resin and Novolac/Fe:SO complex film as a cladding layer on the plastic fibre core. When this sensor head was exposed to ethanol and methanol vapour, the light intensity passing through the sensor head changed remarkably depending on the vapour pressure. The sensor response was also found to be fast, stable and reproducible.

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