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Principle of soil temperature sensor

Principle of soil temperature sensor

2021-10-22

Principle of soil temperature sensor

  Soil temperature sensor is a soil temperature sensor that can monitor the temperature of soil, atmosphere and water, and is used in experiments and scientific research. Soil temperature is abbreviated as ground temperature, which is the general term for surface temperature and ground temperature. The soil temperature is closely related to the growth and development of crops, the decomposition of fertilizers and the accumulation of organic matter. It is an important environmental factor in agricultural production. Soil temperature is also an extremely important factor in the formation of microclimate, so the measurement and research of soil temperature is an important part of microclimate observation and agrometeorological observation. The rise and fall of soil temperature is mainly determined by the size and direction of soil heat flux, but it is also related to soil thermal properties such as soil volume heat capacity, thermal conductivity, density, specific heat and porosity, and soil moisture content. For non-horizontal surfaces, it is also related to the position and size of the slope.


   Then what is the working principle of the soil temperature sensor?


Actually seeing this, many friends want to know the principle of this kind of sensor. In fact, it is similar to the principle of ordinary temperature sensor. It is designed using the thermistor principle, but compared with the conventional temperature sensor, the soil temperature sensor has The more durable sealed shell structure ensures that the sensor can keep working when buried deep underground.


Principle of soil temperature sensor_application of soil temperature sensor

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   Soil temperature sensor error source

  The error of the temperature sensor mainly comes from two aspects. On the one hand, the error comes from the matching measurement and control circuit system. However, the sub-microwatt detection circuit can effectively reduce the self-heating error of the sensor. The resolution of the signal detection circuit can be better than 0.01°C, and the accuracy can reach 0.1°C or even higher. On the other hand, the error comes from solar radiation. When the solar radiation reaches the surface of the temperature sensor, the temperature rise of the temperature sensor caused by the radiation absorption method will be superimposed on the real atmospheric temperature measured by the temperature measuring element. The effect is equivalent to directing the temperature sensor directly Heating, the temperature rise caused by radiant heating can be called solar radiant heating error (abbreviated as radiant error).


Principle of soil temperature sensor_application of soil temperature sensor


   Application of soil temperature sensor

  Soil temperature sensor is widely used in the measurement and research of agriculture, forestry, geology, farmland, water conservancy, forest, lawn, highway, railway maintenance, etc. The intelligent soil temperature monitoring recorder adopts rainproof design. The soil temperature sensor has the characteristics of rapid response and long-term operation in humid environments. It can simultaneously monitor the temperature of soil, atmosphere, and water in real time, with high measurement accuracy and good consistency of the soil temperature sensor. , Large storage capacity, small size, easy to carry. The soil temperature sensor can continuously monitor the soil temperature, with stable performance, high reliability, and maintenance-free.


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