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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Low-Cost Control and Measurement Circuit for the Implementation of Single Element Heat Dissipation Soil Water Matric Potential Sensor Based on a SnSe
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Low-Cost Control and Measurement Circuit for the Implementation of Single Element Heat Dissipation Soil Water Matric Potential Sensor Based on a SnSe

机译：基于SNSE的单元素散热土壤水门潜在传感器实现低成本控制和测量电路

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摘要

A low-cost signal processing circuit developed to measure and drive a heat dissipation soil matric potential sensor based on a single thermosensitive resistor is demonstrated. The SnSe2 has a high thermal coefficient, from −2.4Ω/°C in the 20 to 25 °C to −1.07Ω/°C in the 20 to 25 °C. The SnSe2 thermosensitive resistor is encapsulated with a porous gypsum block and is used as both the heating and temperature sensing element. To control the power dissipated on the thermosensitive resistor and keep it constant during the heat pulse, a mixed analogue/digital circuit is used. The developed control circuit is able to maintain the dissipated power at 327.98±0.3% mW when the resistor changes from 94.96Ω to 86.23Ω. When the gravimetric water content of the porous block changes from dry to saturated (θw=36.7%), we measured a variation of 4.77Ω in the thermosensitive resistor, which results in an end-point sensitivity of 130 mΩ/%. The developed system can easily meet the standard requirement of measuring the gravimetric soil water content with a resolution of approximately Δθw=1%, since the resistance is measured with a resolution of approximately 31μΩ, three orders of magnitude smaller than the sensitivity.
机译：表明了一种用于测量和驱动基于单个热敏电阻的散热土壤Matric电位传感器的低成本信号处理电路。 SNSE2在20至25°C的20至25°C中的高热系数，在20至25°C至-1.07Ω/°C中的高热系数。 SNSE2热敏电阻器用多孔石膏块封装，并用作加热和温度传感元件。为了控制在热敏电阻上消散的功率并在热脉冲期间保持恒定，使用混合的模拟/数字电路。当电阻器从94.96Ω变为86.23Ω时，开发的控制电路能够以327.98±0.3％MW的耗散功率保持在327.98±0.3％。当多孔块的重量含水量从干燥到饱和（θw= 36.7％）时，我们在热敏电阻中测量了4.77Ω的变化，这导致终点灵敏度为130mΩ/％。开发系统可以容易地满足测量重量土壤含水量的标准要求，该分辨率大约Δθw= 1％，因为测量电阻以大约31μΩ的分辨率，比灵敏度小的三个数量级。

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