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Sensors development and instrumentation

What if it was possible for farmers to install dozens or hundreds of inexpensive sensors in the soil to monitor water content, macro- and micro-nutrient status all year round on their fields?

What if soil sensors were so inexpensive that they were easily accessible to scientists across the globe and especially in the developing world?

What if it was possible for scientists to collect information on processes at high spatio-temporal resolution simultaneously in the soil, air and water?

Rapid advances in material science, computer science and wireless technology are increasingly making such a world a reality. One of my goal is to apply these technological advances to the field of soil and water conservation to develop new sensing technologies or improve existing ones. Here are some of my recent projects.

Wireless salinity sensors

Used in a network of multiple sensors to detect changes in runoff electrical resistance as water travels on the hillslope. Electrical resistance is an indicator of salt concentration. More details on this poster.

Wireless soil moisture sensor

Designed to be low-cost, this sensor can measure soil moisture and electrical conductivity. A network of these sensors provides information on the spatial distribution of soil moisture in a field.

Runoff monitoring system

This system was designed to monitor runoff from 12 separate research plots while significantly reducing cost. A $35 single-board computer (Raspberry Pi) was used to log the data at a fraction of the cost of conventional dataloggers.