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DETECTION OF EXPLOSIVES VAPOR AT THE PPT LEVEL WITH A LASER INTERFEROMETRIC…

Award Information

Agency:
Department of Transportation
Branch:
N/A
Award ID:
18811
Program Year/Program:
1993 / SBIR
Agency Tracking Number:
18811
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
SCIENCE RESEARCH LABORATORY INC
15 Ward Street Somerville, MA -
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
 
Phase 2
Fiscal Year: 1993
Title: DETECTION OF EXPLOSIVES VAPOR AT THE PPT LEVEL WITH A LASER INTERFEROMETRIC CALORIMETER
Agency: DOT
Contract: N/A
Award Amount: $272,682.00
 

Abstract:

SCIENCE RESEARCH LABORATORY (SRL) HAS DEMONSTRATED, UNDER FUNDING FROM SDIO, AN ULTRASENSITIVE TECHNIQUE FOR THE REAL-TIME MEASUREMENT OF ABSORPTION DUE TO TRACE GASES IN THE ATMOSPHERE. THE SRL TECHNIQUE, CALLER LASER INTERFEROMETRIC CALORIMETRY (LIC) IS SIMILAR IN PRINCIPLE TO LASER OPTO-ACOUSTIC (LOA) SPECTROSCOPY WHICH HAS BEEN UTILIZED FOR OVER 15 YEARS TO DETECT TRACE CONCENTRATIONS OF VAPORS FROM THE MORE VOLATILE EXPLOSIVES SUCH AS EGDN, NG AND DNT AT THE 1-10 PPB LEVEL. THE NEW LIC TECHNIQUE, HOWEVER, HAS DEMONSTRATED THE ABILITY TO DETECT ABSORPTION AT THE 2 X 10-10 CM -1 LEVEL WITH A SINGLE PULSE FROM A LASER TUNED TO A CHARACTERISTIC ABSORPTION LINE. THIS IS ABOUT 100 TIMES THE SENSITIVITY THAT OPTOACOUSTIC TECHNIQUES HAVE BEEN ABLE TO DEMONSTRATE IN PRACTICE. BY SUMMING SIGNALS FROM A LASER OPERATING AT 10 HZ RATE FOR 10 SECONDS, AN ADDITIONAL FACTOR OF 10 IN SENSITIVITY CAN BE OBTAINED, DROPPING THE MINIMUM DETECTABLE VAPOR CONCENTRATION TO THE 1-10 PPT LEVEL. A PORTABLE LIC SYSTEM COULD THUS EXTEND REAL-TIME DETECTION CAPABILITIES TO LESS VOLATILE EXPLOSIVES SUCH AS TNT. BY USING PRECONCENTRATION TECHNIQUES, OR LASER DESORPTION FROM SURFACES, EVEN LOW VAPOR PRESSURE EXPLOSIVES SUCH AS RDX COULD BE DETECTED.

Principal Investigator:

Dr Stephen F Fulghum
Principal Research Scientist
0

Business Contact:

Small Business Information at Submission:

Science Research Laboratory
15 Ward Street Somerville, MA 02143

EIN/Tax ID:
DUNS: N/A
Number of Employees: N/A
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No