Method And System For Human Presence Correlation Using Carbon Dioxide
AssigneeSRC, Inc.
InventorsMark Angeli, John Durst, Garrett Liddil, Marcello M. DiStasio
Life of this patent
Estimating the term…
Abstract
Method and system for detecting and/or quantifying recent human presence in an environment using a calculated rate of decay of carbon dioxide concentration levels within that environment. A sensor measures the change in carbon dioxide levels over time to calculate the rate of decay to equilibrium and extrapolate recent human presence. Also provided is a method and system for quantifying recent human activity in an environment using the calculated rate of decay to equilibrium.
Claims12
A method for detecting recent human presence in a space, the method comprising the steps of:
- measuring the concentration of carbon dioxide within said space to obtain a first carbon dioxide measurement;
- measuring the concentration of carbon dioxide within said space after a first period of time elapses to obtain at least a second carbon dioxide measurement;
- calculating the carbon dioxide rate of decay using at least said first and said second carbon dioxide measurements;
- accepting a carbon dioxide concentration of interest;
- extrapolating the time at which the concentration of carbon dioxide in said space was approximately equivalent to said carbon dioxide concentration of interest;
- and
- correlating said carbon dioxide rate of decay to a level of human presence in said space at said extrapolated time.
A system for detecting recent human presence in a space, the system comprising:
- measuring means configured to measure the concentration of carbon dioxide within said space to obtain a first carbon dioxide measurement and configured to measure the concentration of carbon dioxide within said space after a first period of time elapses to obtain at least a second carbon dioxide measurement;
- calculating means configured to calculate the carbon dioxide rate of decay using at least said first and said second carbon dioxide measurements;
- accepting means configured to accept a carbon dioxide concentration of interest;
- extrapolating means configured to extrapolate the time at which the concentration of carbon dioxide in said space was approximately equivalent to said carbon dioxide concentration of interest;
- and
- correlating means configured to correlate said carbon dioxide rate of decay to a level of human presence in said space at said extrapolated time.
A computer program stored on a computer useable storage medium, the computer program configured to implement a method for detecting recent human presence in a space, the method comprising the steps of:
- measuring the concentration of carbon dioxide within said space to obtain a first carbon dioxide measurement;
- measuring the concentration of carbon dioxide within said space after a first period of time elapses to obtain at least a second carbon dioxide measurement;
- calculating the carbon dioxide rate of decay using at least said first and said second carbon dioxide measurements;
- accepting a carbon dioxide concentration of interest;
- extrapolating the time at which the concentration of carbon dioxide in said space was approximately equivalent to said carbon dioxide concentration of interest;
- and
- correlating said carbon dioxide rate of decay to a level of human presence in said space at said extrapolated time.
Dependencies are inferred from the claim text.