TDT Overview

TDT (Time Domain Transmissometry)

Technology Explainer

TDT sensors measure the dielectric constant of the soil by sending a high-frequency signal through a probe and measuring the time it takes for the signal to travel through the soil. The dielectric constant changes with soil moisture content, allowing the sensor to estimate moisture levels. The measurement output is given in volumetric water content, which shows how much of the soil is water (%).

Accuracy

Given that the TDT sensor has a measurement frequency above 100 MHz, the TDT sensors have the best measurement accuracy and are therefore used by many research institutions besides the agricultural sector.

Price

TDT sensors, with a high measuring frequency, give the end user the best value for money, as they guarantee the highest accuracy.

Installation & Maintenance

TDT sensors need to be buried in the ground. This requires that a hole is dug to the depth the sensors should be installed at. Thereafter, the sensors need to be inserted into the side walls of the holes.

Once installed, TDT sensors do not require any maintenance or recalibration.

Soil Types

TDT sensors work in all types of natural soils

Measurements

Besides measuring volumetric water content (VWC) TDT sensors also measure soil temperature.

Summary

High Accuracy: TDT sensors provide precise measurements of soil moisture, making them highly reliable for scientific and commercial agricultural use.

Depth Profiling: These sensors can measure soil moisture at various depths, offering a detailed moisture profile.

Temperature Compensation: TDT sensors often include temperature compensation, which enhances measurement accuracy.

Cost: High quality TDT sensors are generally more expensive compared to other types, which can be a barrier for small-scale farmers.

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