Systems and methods for implementing advanced agent monitoring using a heated vaporizer inlet apparatus

Patent metadata

Field	Value
Publication number	US-9347927-B2
Application number	US-201313918886-A
Country	US
Kind code	B2
Filing date	Jun 14, 2013
Priority date	Jun 14, 2013
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

A system and method are provided for implementing an advanced monitoring scheme to detect a localized presence of particular target substances, including toxic chemical agents, in a space, and particularly for detecting and monitoring a presence of chemical agents that are absorbed into porous or semi-porous products and surfaces in the space when it is determined that potential chemical agent exposure has occurred. A heated vaporizer inlet apparatus provides a sensor source that is optimized for the detection of less volatile chemical agents, and particular less volatile chemical agents, that have been absorbed by materials with porous compositions or surfaces. The heated vaporizer inlet apparatus is used for heating architectural surfaces that were exposed to chemical agents in an effort to substantially increase a vapor pressure of a target substance disposed on or absorbed in a particular target surface.

First claim

I claim:

1. A method for providing an air sample associated with a contamination level of a target surface to an analyzer, comprising:
directing a stream of air along a first air flow path in a device between an air supply source and an exit opening at an end of the device;
controlling, with a processor, a flow rate of the stream of air by controlling a pressure of air from the air supply source;
heating the stream of air upstream of the exit opening at the end of the device;
directing the stream of heated air from the exit opening toward a target surface, an impingement of the stream of heated air on the target surface causing a release of a target substance by raising a vapor pressure of the target substance, at least a portion of the target substance being entrained in the stream of heated air;
collecting a volume of return air via a second air flow path in the device, the volume of return air being at least a portion of the stream of heated air with the at least the portion of the target substance entrained therein, the second air flow path being a separate and distinct air flow path from the first air flow path;
directing the return air via the second air flow path to an air analyzer for analysis of the target substance as an indication of a contamination level of the target surface;
receiving feedback, with the processor, from the air analyzer regarding a volume of entrained components from the target substance detected in the return air; and
adjusting, with the processor, a flow rate and a temperature of the stream of heated air based on the feedback.

2. The method of claim 1 , further comprising supplying the air for the stream of air directed along the first air flow path with the air supply source, the air supply source being a blower unit that takes in ambient air through an inlet and exhausts the air for the stream of air directed along the first flow path from an outlet,
the processor controlling the pressure of the air exhausted from the blower unit via the outlet.

3. The method of claim 2 , further comprising filtering the air through a filter element placed at least one of in the inlet or in the outlet of the blower unit.

4. The method of claim 2 , the heating the stream of air comprising passing the air over heater elements, the heater elements being located at least one of (1) within the blower unit, or (2) in the first air flow path between the blower unit and exit opening.

5. The method of claim 4 , further comprising controlling, with the processor, a temperature of the heater elements to produce a selected temperature for the stream of heated air exiting the exit opening of the first air flow path.

6. The method of claim 5 , further comprising controlling, with the processor, a flow rate of the return air in the second air flow path to be greater than a flow rate of the stream of air in the first flow path.

7. The method of claim 5 , further comprising:
storing a database of material characteristics for at least one of a plurality of user-selectable target substances or at least one of a plurality of user-selectable surface materials from which the target surface may be formed.

8. The method of claim 7 , the material characteristics including at least one of vaporization temperature ranges for the plurality of target substances, physical property changing temperature ranges for the plurality of target substances, chemical property changing temperature ranges for the plurality of target substances or destructive temperature limits ranges for the plurality of target substances or the plurality of surface materials.

9. The method of claim 8 , further comprising:
receiving, via a user interface with the processor, a user input regarding a user-selected at least one of the target substance or the surface material from which the target surface is formed;
referencing, with the processor, the stored database of material characteristics; and
initially adjusting, with the processor, at least one of the flow rate or the temperature of the stream of heated air based on the received user input regarding the at least one of the target substance or the surface material from which the target surface is formed.

10. A system for providing an air sample associated with a contamination level of a target surface to an analyzer, comprising:
a controllable air supply source;
a first air flow path that directs a stream of air along between the air supply source and an exit opening;
at least one heater element that heats the stream of air in the first airflow path upstream of the exit opening, the exit opening being configured to selectively direct the stream of heated air exiting the exit opening toward a target surface, an impingement of the stream of heated air on the target surface causing a release of a target substance by raising a vapor pressure of the target substance, at least a portion of the target substance being entrained in the stream of heated air;
a second air flow path that collects a volume of return air from the target surface, the volume of return air being at least a portion of the stream of heated air with the at least the portion of the target substance entrained therein, the second air flow path being a separate and distinct air flow path from the first air flow path;
a conduit that directs the return air from the second air flow path to an input of an air analyzer for analysis of the target substance entrained in the return air as an indication of a contamination level of the target surface; and
a processor that is configured to
control a flow rate of the stream of air by controlling a pressure of air from the air supply source;
receive feedback from the air analyzer regarding a volume of entrained components from the target substance detected in the return air; and
adjust a flow rate and a temperature of the heated stream of air based on the feedback.

11. The system of claim 10 , the air supply source comprising a separate and self-contained gas source that supplies an inert gas to the first air flow path.

12. The system of claim 10 , the air supply source comprising a blower unit that takes in ambient air through an inlet and exhausts the air for the stream of air directed along the first flow path from an outlet.

13. The system of claim 12 , further comprising a filter element placed at least one of in the inlet or in the outlet of the blower unit that filters the ambient air.

14. The system of claim 12 , the at least one heater element being located at least one of (1) within the blower unit, or (2) in the first air flow path between the blower unit and exit opening.

15. The system of claim 14 , the processor being further configured to control a temperature of the at least one heater element to produce a selected temperature for the stream of heated air exiting the exit opening of the first air flow path.

16. The system of claim 15 , the processor being further programmed to control a flow rate of the return air in the second air flow path to be greater than a flow rate of the stream of air in the first flow path.

17. The system of claim 15 , further comprising a data storage unit storing a database of material characteristics for at least one of a plurality of user-selectable target substances or at least one of a plurality of user-selectable surface materials from which the target surface may be formed,
the material characteristics including at least one of vaporization temperature ranges for the plurality of target substances, physical property changing temperature ranges for the plurality of target substances, chemical proper

Assignees

• Lockheed Corp

Inventors

• Wood John

Classifications

• G01N2001/028

  Sampling from a surface, swabbing, vaporising · CPC title

• G01N1/2273

  Atmospheric sampling · CPC title

• G01N33/0009 Primary

  General constructional details of gas analysers, e.g. portable test equipment (devices for withdrawing samples in the gaseous state G01N1/22) · CPC title