NASA/Goddard Space Flight Center, Code 219, Greenbelt, MD 20771

66 -- SPECTRAL RADIOMETERS SOL NAS5-62316-261 DUE 091499 POC Cosimo Lucchese, Contract Specialist, Phone (301)614-5584, Fax (301)614-5619, Email clucches@pop200.gsfc.nasa.gov -- Rex T. Elliott, Contracting Officer, Phone (301)286-6204, Fax (301)286-0247, Email Rex.T.Elliott.1@gsfc.nasa.gov WEB: Click here for the latest information about this notice, http://nais.nasa.gov/EPS/GSFC/date.html#NAS5-62316-261. E-MAIL: Cosimo Lucchese, clucches@pop200.gsfc.nasa.gov. NASA/GSFC plans to issue a Request for Proposals for a three-year Indefinite Quantity/Indefinite Delivery contract for automatic Sun and Sky Scanning Spectral Radiometers with a Best Estimated Quantity of 60 units in support of the AERONET program. Sun and sky scanning spectral radiometers are used under this program to monitor aerosol optical properties and precipitable water in near real time for validation of satellite-derived retrievals of aerosol properties and to provide a uniform database for long-term characterization of aerosol optical properties within NASA's global climate change program. This instrument must be capable of measuring both sun and sky using a combination of spectral filters and a fully autonomous azimuth/zenith-viewing microprocessor-controlled robot. It must be capable of automatically changing gains from the sky-radiance-measurement mode to the sun-measurement mode without saturating signal response. A two-detector/two-collimator system is required in order to assess the quality of data from each detector system. The instrument must possess eight filters with the following centerband/nanometer bandwiths: 340/2, 380/4, 440/10, 675/10, 870/10, 940/10,940/50, and 1020/10. Optical characteristics include a collimator/detector for sun measurements with 1 degree FOV, no optics sky, collimator 1 degree FOV, lens required 10-5 stray light rejection relative to the sun at 2 degrees from sun.. The instrument shall have four quad silicon cells for sun tracking, with silicon sensors for sun and sky radiance in the 0.25-1.1 micron range. The instrument must be battery-powered and rechargeable from solar cells. It must be sealed from rain, humidity, dust and smoke and operate successfully within a temperature range of -40 to 60 degrees Celsius for a year with minimum maintenance. The instrument must have a demonstrated capability to communicate with the Vitel VX-1004 data collection platforms to transmit data via the international Data Collection System. The Government intends to acquire a commercial item using FAR Part 12. The commercial instrument most commonly used for this application is the Cimel Model CE-318 Photometre Automatique. Oral communications are not acceptable in response to this notice. All responsible sources may submit an offer which shall be considered by the agency. An Ombudsman has been appointed. See Internet Note "B". The solicitation and any documents related to this procurement will be available over the Internet. These documents will be in Microsoft Office (Word 6.0, Excel 5.0, or PowerPoint 4.0) format and will reside on a World Wide Web (WWW) server, which may be accessed using a WWW browser application. The WWW address, or URL of the NASA/GSFC Business Opportunities home page is http://procurement.nasa.gov/EPS/GSFC/class.html. Prospective offerors shall notify this office of their intent to submit an offer. It is the offeror's responsibility to monitor this site for the release of the solicitation and amendments (if any). Potential quoters will be responsible for downloading their own copy of the solicitation and amendments (if any). Any referenced notes can be viewed at the following URL: http://genesis.gsfc.nasa.gov/nasanote.html. Posted 08/11/99 (D-SN366423). (0223)

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