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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Measuring moisture content using time-domain reflectometry ： ウィキペディア英語版 Measuring moisture content using time-domain reflectometry Time-domain reflectometry or TDR is a measurement technique which correlates the frequency-dependant electric and dielectric properties of materials such as soil, agrarian products, snow, wood or concrete to their moisture content. Measurement usually involves inserting a sensor into the substance to be tested and then applying either Standard Waveform Analysis to determine the average moisture content along the sensor or Profile Analysis to provide moisture content at discrete points along the sensor. A spatial location can be achieved by appropriate installation of several sensors. == Standard Waveform Analysis == In the waveform analysis a sensor (usually a probe) is placed in the material to be tested. The sensor contains a waveguide consisting of two or three parallel wires which is connected via a coaxial cable to a voltage pulse generator which sends precisely defined voltage pulses into the sensor. As the pulse travels along the waveguide its progress varies depending on the moisture content of the material being examined. When the pulse reaches the end of the waveguide it is reflected. This reflection is visualised in a TDR waveform using an oscilloscope connected to the sensor. The intensity of the pulse in the probe is measured and related to moisture content, with higher voltage indicating an increase of moisture. By comparing the measured reflection to the initial pulse the average moisture content and relative permitivity of the sample can be calculated by using an equivalent circuit as a reference. Standard waveform analysis can be used either manually (hand held instruments) or automatically for monitoring moisture content in several areas such as hydrology, agriculture and construction. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Measuring moisture content using time-domain reflectometry」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.