The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 02, 2021
Filed:
Nov. 25, 2015
Erkka Sointula, Salo, FI;
Peter Ellegaard, San Diego, CA (US);
Erkka Sointula, Salo, FI;
Peter Ellegaard, San Diego, CA (US);
AQUASPY, INC., San Diego, CA (US);
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.