Gas Sensor
First Claim
Patent Images
1. 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.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
16 Claims
-
1. 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. - View Dependent Claims (2, 3, 4, 5, 11)
-
-
6. 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; a third oscillator exposed to an environment containing another gas to be sensed, and having a third frequency output; circuitry configured for determining if the gases are sensed by the second and third oscillators by producing first and second frequency difference signals that are a difference between the first and second, and first and third frequency outputs, respectively; and a controller configured to determine a concentration of the sensed gases as functions of the first and second frequency difference signals and the one or more environmental sensor outputs. - View Dependent Claims (7, 8, 9, 10)
-
-
12. A gas sensor comprising:
-
a first oscillator exposed to a gas environment and outputting a first frequency output; a second oscillator comprising a gas sorbent coating and exposed to a gas environment, and outputting a second frequency output; circuitry configured for determining a mass of gas absorbed by the sorbent coating on the second oscillator by producing a frequency signal that is a difference between the first and second frequency outputs; a gas pressure sensor; a humidity sensor; a temperature sensor; and a controller configured for determining a concentration of the mass of the absorbed gas as a function of the frequency difference signal and signals from the gas pressure sensor, humidity sensor, and the temperature sensor. - View Dependent Claims (13, 14, 15, 16)
-
Specification