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1. (WO2017066721) CONTINUOUS FLOW FLUID CONTAMINANT SENSING SYSTEM AND METHOD

Pub. No.:    WO/2017/066721    International Application No.:    PCT/US2016/057239
Publication Date: Fri Apr 21 01:59:59 CEST 2017 International Filing Date: Sat Oct 15 01:59:59 CEST 2016
IPC: G01N 15/06
G01F 1/12
G01N 11/00
G01N 29/00
Applicants: QUANSOR CORPORATION
Inventors: MERRILL, John H.
WALDROP, Alex, A., III
BECKS, Eric R.
Title: CONTINUOUS FLOW FLUID CONTAMINANT SENSING SYSTEM AND METHOD
Abstract:
A sample fluid (14) is pumped through a first cavity (38) associated with a first piezoelectric resonator (20.1) and pumped through a second cavity (40) associated with a second piezoelectric resonator (20.2). An electrode (26) of the first piezoelectric resonator (20.1) exposed to the sample fluid (14) in the first cavity (38) is coated with an adsorption layer (34.1) that provides for adsorbing a substance (12) to be detected in the sample fluid (14). The adsorbed substance (12) changes the resonant frequency of the first piezoelectric resonator (20.1) relative to that of the second piezoelectric resonator (20.2), wherein a change in the frequency difference therebetween relative to an initial frequency difference is responsive to and provides a measure of the mass of adsorbed substance (12). The adsorption layer (34.1) of the first piezoelectric resonator (20.1) is automatically refreshed when a change in the frequency difference crosses a threshold (ΔFEOR).