bioaerosol agile laser detection

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Broadband agile wavelength laser for chemical aerosol detection
Army STTR FY2009A - Topic A09A-T020
Opens: February 24, 2009 - Closes: March 25, 2009 6:00am EST

 

A09A-T020 TITLE: Broadband agile wavelength laser for chemical aerosol detection

 

TECHNOLOGY AREAS: Chemical/Bio Defense, Sensors

OBJECTIVE: We are seeking an advanced compact transmitter emitting at least 100 mJ/pulse with significantly improved inter-band coverage from 9-12 �Ým for standoff detection of battlefield chemical aerosol agents at ranges of 3-5 km.

DESCRIPTION: Prior work with the FAL (Frequency Agile Laser) sensor shows that it is very capable in detection of biological aerosols by DISC (Differential Scattering) and chemical vapors by DIAL (Differential Absorption Lidar) in the LWIR (Long Wave Infrared). It is required to extend this target interrogation capability to the important cases of chemical aerosols, chemical aerosols mixed with vapor, and both target types mixed with interferents. The FAL CO2 laser presently operates in the 9.3-10.7 �Ým wavelength range on the four normal bands which is sufficient to probe features of biological aerosol and battlefield chemical vapor agents. However, there are clefts between the four normal CO2 laser bands where some important chemical aerosols such as GA and VX cannot be probed. In addition, there are chemical aerosol and vapor agent features in the 11-11.5 �Ým region that would improve detection. By extending band coverage of the normal CO2 laser the masking effects of battlefield interferents would be reduced and the robustness of detection algorithms would be improved by use of a wider data base.

PHASE I: Perform analysis and feasibility study. Develop conceptual designs for the laser critical components and the demonstrator laser, including a means to achieve rapid wideband wavelength tunability. Provide a detailed development plan for design, fabrication, and testing of the wavelength agile, broadband, compact transmitter to be carried out in the Phase II program.

PHASE II: Use the results of Phase I to develop any critical laser components required for the demonstrator laser. Fabricate, demonstrate, and deliver the new broadband transmitter, including all components required to achieve full functionality. Provide a roadmap for development of the transmitter into a fieldable brassboard device for integration with the FAL sensor.

PHASE III DUAL USE APPLICATIONS: The result of Phase II will be demonstration of a transmitter for a single sensor that can detect a large array of both chemical and biological battlefield agents in their various forms as well as a number of toxic agents found in the civilian chemical industry. In addition to a number of different military deployments, the new transmitter will support diverse applications in civilian WMD (Weapons of Mass Destruction) defense, pollution monitoring, and mapping of clouds from chemical process and transport accidents.

REFERENCES:
1. D. Cohn, J. Fox and C. Swim, "Frequency agile CO2 laser for chemical sensing", SPIE Proceedings, Los Angeles, California, vol. 2118, p 72, (Jan 1994).

2. R. E. Warren, "Discriminating Aerosols By Multi-Wavelength Lidar," Proceedings Sixth Joint Conference On Standoff Detection For Chemical and Biological Defense, Williamsburg, VA October 25-29, 2004.

3. R. Vanderbeek, R. Warren, and J. Ahl, "LWIR differential scattering discrimination of bio aerosols", 7th Joint Conference On Standoff Detection For Chemical And Biological Defense, Williamsburg, VA, Oct 2006.

4. R. Warren and R. Vanderbeek, "Extended Kalman filter for multiwavelength differential absorption lidar", Proceedings of the SPIE 15th Annual International Symposium on Aerospace/Defense Sensing, Simulation, and Controls, April 2001.

KEYWORDS: Laser standoff detection, chemical and biological defense, long wave infrared laser transmitter

TPOC: Raphael Moon
Phone: 410-436-6624
Fax: 410-436-8363
Email: raphael.moon@us.army.mil
2nd TPOC: Ed Conley
Phone: 410-436-5632
Fax: 410-436-8929
Email: edward.conley@us.army.mil

Questions may also be submitted through DoD SBIR/STTR SITIS website.

 

** TOPIC AUTHOR **

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