Types of Soil Moisture Sensors

There are various types of soil moisture sensors, and different types are suitable for different application scenarios and measurement needs. Here are a few common types of soil moisture sensors:

Capacitive soil moisture sensor: this type of sensor utilizes the principle of capacitance to measure the moisture content in the soil. It consists of two metal electrodes and calculates the moisture content in the soil by measuring the capacitance value between the two electrodes. This sensor is suitable for all types of soil and has high measurement accuracy and stability.

Resistive soil moisture sensor: this sensor utilizes the principle of electrical resistance to measure the moisture content in the soil. It consists of two metal electrodes and calculates the moisture content in the soil by measuring the resistance between the two electrodes. This sensor is suitable for cohesive and sandy soils, but is susceptible to salt and ion concentrations.

Spectral Soil Moisture Sensor: This type of sensor utilizes spectral analysis technology to measure the moisture content in the soil. It calculates the moisture content of the soil by transmitting electromagnetic waves of a certain frequency into the soil and measuring the change in frequency of the reflected electromagnetic waves. This type of sensor is suitable for all types of soil, but is more expensive.

Weight-based soil moisture sensor: This sensor utilizes the principle of weight to measure the moisture content in the soil. It calculates the moisture content in the soil by measuring the reduction in the mass of soil in the container. This sensor is suitable for all types of soil but requires frequent weighing and data recording.

Infrared Soil Moisture Sensor: This sensor utilizes the infrared principle to measure the moisture content in the soil. It calculates the moisture content of the soil by emitting infrared light of a certain wavelength into the soil and measuring the change in wavelength of the reflected infrared light. This sensor is suitable for all types of soil but is more expensive.

In conclusion, when choosing a soil moisture sensor, it is necessary to make comprehensive consideration according to the actual needs and budget, and choose the suitable sensor type and specification to ensure the accuracy and stability of the measurement.

Agricultural Sensors Catalogue

Agriculture-Sensors-Catalog-NiuBoL-2024.pdf