# US 7,743,643 B2 · Innovative gas monitoring with spacial and temporal analysis

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- Number: US 7,743,643 B2
- Document ID: US7743643B2
- Status: Granted
- Kind: B2
- Application number: 12/182,632
- Filed: 2008-07-30
- Published: 2009-05-28
- Granted: 2010-06-29
- Earliest claimed: 2003-08-20
- Assignees: Airdar Inc.
- Inventors: Dennis Scott Prince
- Web page: https://patentgrep.com/patent/US7743643B2

## CPC

- G01N 33/0057: {Warfare agents or explosives}
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

The present invention relates to the monitoring of gas concentrations possible in very low ranges (i.e., low ppb and even ppt ranges) and especially use thereof in environmental monitoring, exposure assessment, bomb detection, and health studies. The invention can use a spatial and temporal assessment of gas concentrations that enables the sources of the gas in question to be located and identified which is useful in environmental and health field but can also be applied to other fields an example of which is detecting and locating explosives. This technology can uses small, light weight, and low power components that allow for the monitor to be portable and even worn on a person as a personal monitor. This technology can be used in a stationary monitors as well.

## Claims

### Claim 1

A method for determining a concentration for a gas, said method utilizing a sensor and comprising the steps of:
monitoring an output from the sensor during a first exposure condition;
determining a rate of change for the sensor output for said first exposure condition;
monitoring the output from the sensor during a second exposure condition and determining a rate of change for the sensor output for said second exposure condition;
determining differences in said rates of change for the sensor output during said first and said second exposure conditions; and
correlating the differences in said rates of change to determine the concentration of the gas.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein said step of correlating comprises a logarithmic curve fitting to quantify the differences in said rates of change.

### Claim 3 (depends on 1)

The method as claimed in claim 1, wherein said first exposure condition comprises subjecting the sensor to a sample comprising a sample of the gas and another compound.

### Claim 4 (depends on 3)

The method as claimed in claim 3, wherein said second exposure condition comprises eliminating the other compound from said sample.

### Claim 5 (depends on 1)

The method as claimed in claim 1, wherein said second exposure condition comprises subjecting the sensor to a sample comprising a sample of the gas and a plurality of other compounds.

### Claim 6 (depends on 1)

The method as claimed in claim 1, wherein said first exposure condition comprises a sample of the gas and said second exposure condition comprises a sample of a known concentration.

### Claim 7 (depends on 6)

The method as claimed in claim 6, wherein said second exposure condition comprises superimposing a compound to amplify the response of the sensor.

### Claim 8 (depends on 7)

The method as claimed in claim 7, wherein said second exposure condition comprises superimposing a compound for increasing the sensitivity of the sensor.

### Claim 9 (depends on 1)

The method as claimed in claim 1, wherein said sensor comprises a plurality of sensors and each of said plurality of sensors is configured to measure a different gas.

### Claim 10 (depends on 1)

The method of claim 1 wherein the gas is related to explosive devices.

### Claim 11 (depends on 10)

The method of claim 10 wherein the gas is at least one explosive indicator compound.

### Claim 12 (depends on 1)

The method of claim 1 wherein the gas is a health concern.