Sensor and method for detecting a substance

Patent No. 8,049,517

Issued: November 1, 2011
Filed: December 15, 2008

Inventors: Greenwald; Shlomo (Ithaca, NY), Greenwald; Zipora (Ithaca, NY), Greenwald; Uri Moshe (Ithaca, NY)
Assignee: Greenwald Technologies, LLC (Ithaca, NY)


A sensor for detecting a substance in a physical space, having an RF energy emitter fed by a signal source on one side of the space and an RF energy receiving element coupled to a detector at an opposite side of the channel, spaced apart by a distance (r) selected so that when the signal wavelength (.lamda.) changes based on the value of the dielectric constant (.di-elect cons.) of the particular substance in the physical space between the emitter and receiver, the mode of field type within the sensor channel changes between near field and intermediate or far field mode.

Reference to Related Applications

This application claims one or more inventions which were disclosed in Provisional Application No. 60/744,951, filed Apr. 17, 2006, entitled "Liquid/Air Bubble/Solid Objects Detector." The benefit under 35 USC 119(e) of the United States provisional application is hereby claimed, and the aforementioned application is hereby incorporated herein by reference.

This is a continuation-in-part of co-pending patent application Ser. No. 11/735,784, now US Patent 7,482,818, entitled "SYSTEMS AND METHODS FOR DETECTING THE PRESENCE AND/OR ABSENCE OF A SOLID LIQUID OR GAS", filed Apr. 16, 2007. The aforementioned application is hereby incorporated herein by reference.


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