(info thanks to donpat of the Raging Bull APNT private members' forum)

WO/2011/085193 GAS SENSOR

Pub. No.:
WO/2011/085193

International Application No.:
PCT/US2011/020510

Publication Date:
14.07.2011

International Filing Date:
07.01.2011

Applicants:
APPLIED NANOTECH HOLDINGS, INC. [US/US]; Suite 107 3006 Longhorn Blvd. Austin, Texas 78758 (US) (All Except US).
PAVLOVSKY, Igor [RU/US]; (US) (US Only).

Inventor:
PAVLOVSKY, Igor; (US).

Priority Data:
12/685,629
11.01.2010
US

Title: GAS SENSOR

Abstract:
A gas sensor with instant response uses one or more oscillators while no chemical reactions or other material modifications are involved. Sensor can be used in any application to measure a percent range of gas concentrations, or mass of the absorbed gas.

WHAT IS CLAIMED IS:
l . A gas sensor comprising:

a first oscillator sealed in a hermetic package and having a first frequency output; a second oscillator exposed to an environment containing a gas to be sensed, and having a second frequency output;

circuitry configured for determining if the gas is sensed by the second oscillator by producing a first frequency difference signal that is a difference between the first and second frequency outputs;

one or more environmental sensors configured for measuring an environmental variable of the environment containing the gas to be sensed, and having one or more environmental sensor outputs; and

a controller configured to determine a concentration of the sensed gas as a function of the first frequency difference signal and the one or more environmental sensor outputs.

http://is.gd/mBBBDM