Soil moisture and electrical conductivity probe
US10935537B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 2015 |
| Grant date | Mar 2, 2021 |
| Priority date | — |
| Expiry date | Sep 18, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/0098
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A Soil Moisture and Electrical Conductivity Probe. The soil moisture probe employs brass ring pairs, wherein each pair incorporates dual feedpoints. There is a single main control circuit for operating the plurality of sensor ring pairs in a multiplexed approach. In order to allow for multiplexed operation, each sensor ring pair includes a signal tuning assembly. The signal tuning assembly includes apparatus for attenuating the signal noise at each sensor ring pair, as well as apparatus for matching the ring-pair to ring-pair lead impedence. The temperature of each ring pair is individually detected to improve the accuracy of all of the sensor ring pairs. This temperature sensing is accomplished by multiplexing a single reference voltage with all of the sensor rings, and by implementing a thermistor at each sensor ring pair.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.