Self Calibration Devices for Chemical and Bio analytical Trace Detection Systems

• US 20090205398A1
• Filed: 10/16/2008
• Published: 08/20/2009
• Est. Priority Date: 10/17/2007
• Status: Active Grant

• Current Assignee: George Washington University, Navy Government of The USA As Represented By The Secretary of The
• Original Assignee: Navy Government of The USA As Represented By The Secretary of The
• Inventors: Nagel, David, McGill, R. Andrew, Pai, Rekha, Mills, Patrick
• Granted Patent: US 8,051,697 B2
• Time in Patent Office: Days
• US Class Current: 73/1.20
• CPC Class Codes: G01N 27/622 Ion mobility spectrometry

Abstract

The present invention relates to chemical and bioanalytical sensors and sensor systems, particularly to systems incorporating a calibration device for sensors where the calibration device is composed of structures and materials for trapping and retaining calibrant materials until they are needed and released quantitatively.

Claims

1. A microelectromechanical device for calibration of a sensor, comprising:

(i) an array of micromachined MEMS structures for storage of calibrant molecules; and

(ii) a calibrant releasing or interferent releasing structure operatively associated with the array.

3. The device of claim 1, further comprising wherein the calibrant releasing or interferent releasing structure is a film that comprises a polymeric film containing a calibrant or interferent wherein the film is fixed on a microelectrical-mechanical system (MEMS) array, and wherein the array comprises a heating element adjacent to said film, and wherein heating of said film releases said calibrant or interferent, and wherein the film comprises at least two or more films of differing thicknesses wherein calibration using the at least two or more films provides a sensitive calibration profile.

8. The device of claim 1, wherein the calibrant releasing or interferent releasing structure is a reservoir that comprises (i) a canal or well within a MEMS array;

(ii) a membrane covering said canal or well; and

(iii) a rupture mechanism operatively associated with the membrane, wherein the membrane is capable of trapping a calibrant or interferent within the canal or well, and wherein upon rupture of the membrane the calibrant or interferent is released, and wherein the reservoir well or canal comprises wells of at least two different sizes wherein calibration using the at least different wells provides a sensitive concentration-to-volume calibration profile.

2. A film for calibration of a sensor, comprising:

a polymeric film containing a composition selected from a calibrant or an interferent wherein the film is fixed on a microelectrical-mechanical system (MEMS) array, and wherein the array comprises a heating element adjacent said film, and wherein heating of said film releases said calibrant or interferent composition.

4. A calibrant or interferent reservoir for calibration of a sensor, comprising:

(i) a canal or well within a MEMS array;

(ii) a membrane covering said canal or well; and

(iii) a rupture mechanism operatively associated with the membrane, wherein the membrane is capable of trapping a calibrant or interferent within the canal or well, and wherein upon rupture of the membrane the calibrant or interferent is released.

5. The calibrant reservoir of claim 4, wherein rupture mechanism is an electronically actuated rupture device.

6. The calibrant reservoir of claim 4, wherein rupture mechanism is an optically actuated rupture device.

7. The calibrant reservoir of claim 4, further comprising a heater device for heating the calibrant.

9. A retrofit unit for a sensor, comprising:

a) housing suitable for operational integration with an existing sensor; and

b) a microelectromechanical device for calibration of a sensor, comprising;

an array of micromachined MEMS structures; and

a calibrant releasing or interferent releasing structure operatively associated with the array.

10. The retrofit unit of claim 9, wherein the existing sensor is selected from the group consisting of hand-held sensors, desktop sensors, and built-in sensors.

11. A slide-in replacement for a sensor, comprising:

a) housing suitable for operational replaceable integration with an existing sensor; and

b) a microelectromechanical device for calibration of a sensor, comprising;

an array of micromachined MEMS structures; and

a calibrant releasing or interferent releasing structure operatively associated with the array.

12. The slide-in replacement unit of claim 11, wherein the existing sensor is selected from the group consisting of hand-held sensors, desktop sensors, and built-in sensors.