Palade D.D.,National Institute of Research Development in Mechatronics and Measurement Technique |
Darie C.I.,National Institute of Research Development in Mechatronics and Measurement Technique
Romanian Review Precision Mechanics, Optics and Mechatronics | Year: 2015
Herein we present a device whose sensitive element is made of a polyacrylamide hydrogel operating in cycles of water absorption-release. Changes in the volume of the sensing element are materialized by translating a rod acting on the blades of an electric contact so that when precalibrated soil moisture threshold value are reached, the lamellar contact state changes. The response time of the sensor depends on the balance of hydrophilic / hydrophobic polymer matrix specific to the type of polyacrylamide hydrogel used and its degree of reticulation. © 2015, Editura Cefin. All rights reserved.