PULSED ABSORPTION DIFFRACTOMETER FOR DETECTING TRACE SPECIES

Award Information
Agency: National Science Foundation
Branch: N/A
Contract: N/A
Agency Tracking Number: 21613
Amount: $49,929.00
Phase: Phase I
Program: SBIR
Awards Year: 1993
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Science Research Laboratory
15 Ward St, Somerville, MA, 02143
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Allen Flusberg
 (617) 547-1122
Business Contact
Phone: () -
Research Institution
N/A
Abstract
WITH THE INCREASE IN ATMOSPHERIC POLLUTION AND A NEW, GROWING PUBLIC AWARENESS OF RESULTING ENVIRONMENTAL DAMAGE, THERE IS A NEED FOR NEW TECHNOLOGY TO MEASURE THE CONCENTRATION OF TRACE SPECIES IN THE ATMOSPHERE. EXTRACTIVE METHODS, IN WHICH A SEALED SAMPLE OF AIR IS ANALYZED IN A LABORATORY, ARE EXPENSIVE AND INAPPLICABLE TO CONTINUOUS, IN SITU MONITORING OF CONCENTRATIONS. THE DEVELOPMENT OF AN INSTRUMENT CALLED A PULSED ABSORPTION DIFFRACTOMETER (PAD) IS BEING DEVELOPED TO FILL THIS NEED. THE BASIS OF THIS INSTRUMENT IS THE DETECTION OF A TRANSIENT, VOLUMETRIC DIFFRACTION GRATING THAT IS FORMED AFTER A PULSED LASER BEAM IS ABSORBED BY TRACE SPECIES PRESENT IN THE ILLUMINATED REGION. THE PAD IS SENSITIVE TO PARTS-PER-TRILLION TRACE-GAS CONCENTRATIONS, 2-3 ORDERS OF MAGNITUDE BETTER THAN INSTRUMENTS BASED ON OTHER APPROACHES TO MONITOR TRACE SPECIES IN THE FIELD.

* information listed above is at the time of submission.

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