An Accurate Measurement Sensor for Volumetric Soil Water Content

Award Information
Agency: Department of Agriculture
Branch: N/A
Contract: N/A
Agency Tracking Number: 30522
Amount: $55,000.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: N/A
Solicitation Number: N/A
Solicitation Year: N/A
Award Year: 1995
Award Start Date (Proposal Award Date): N/A
Award End Date (Contract End Date): N/A
Small Business Information
RR 1, Box 38, Portland, ND, 58274
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 () -
Business Contact
 Mr. Paul Stockton
Phone: () -
Research Institution
Self-calibrating, low-cost, microprocessor based, combined soil volumetric water content, conductivity, and temperature sensor is proposed herein. The objective of this feasiblity study is to conduct tests to evaluate the device under a variety of conditions and to demonstrate the validity and viability of the sensor design. Existing low-cost, high volume commercial devices designed to determine soil moisture by measuring electrical properties (conductance or capacitance) of an admixture of soil, water, salts, fertilizers, etc. have not been able to adequately resolve, utilize and/or interpret the components of reactive impedance (conductance/resistance and impedance) to provide an accurate, and repeatable measurements, especially measurements of soil moisture under a broad range of field conditions. As a result, low cost, currently available sensors may operate under limited or idealized conditions, but do not function properly under a range of typical real world conditions. An improved electronic design overcomes the short comings of earlier sensor designs providing a true, accurae measurement of capacitive reactance due to water in soil under a wide range of conditions. In addition, other significant factors effecting the soil water content determination, including temperature, conductivity, and in-situ calibration, are addressed and solved in this innovative design.

* Information listed above is at the time of submission. *

Agency Micro-sites

SBA logo
Department of Agriculture logo
Department of Commerce logo
Department of Defense logo
Department of Education logo
Department of Energy logo
Department of Health and Human Services logo
Department of Homeland Security logo
Department of Transportation logo
Environmental Protection Agency logo
National Aeronautics and Space Administration logo
National Science Foundation logo
US Flag An Official Website of the United States Government