Loren Data Corp.

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COMMERCE BUSINESS DAILY ISSUE OF JANUARY 2,1998 PSA#2003

DOC; Mountain Administrative Support Center; Acquisition Management Division; 325 Broadway MC3; Boulder, CO

66 -- GONIOMETER FOR X-RAY DIFFRACTION STUDIES SOL NB853-803212DT POC Doris Turner, Purchasing Agent, (303) 497-3872 or FAX (303) 497-3163 E-MAIL: NOAA; MASC Acquisition Management, Doris.P.Turner@noaa.gov. The National Institute of Standards and Technology (NIST) in Boulder, CO requires an accurate, rigid, and repeatable goniometric specimen and detector positioning system for high- energy transmission (and reflection) x-ray diffraction measurements of stress and texture. At least three independent rotational motions are required to rotate the specimen about the Eulerian axes in front of a stationary, collimated x-ray beam, and an additional rotational axis to position an energy sensitive detector, or area imager, to intercept diffracted x-rays. The goniometer design should provide the widest range of angular specimen motion possible, while producing a minimum of mechanical interference with our source and detector. Since we anticipate investigations of large specimens (as well as small ones), the goniometer should be capable of supporting a large (150 x 150 x 30 mm), massive (5 kg) specimen with minimal sag. A "kappa" style goniometer, appears to offer the best combination of rigidity and specimen accessibility. All rotational axes shall be driven by stepper, dc, or servo motors with sufficient torque capability to provide smooth motion with a 5 kg specimen attached to the phi axis. Each rotational axes should be equipped with an encoder having 0.002-degree resolution (or better). At least the kappa axes should be counterbalanced, to maximize rotational accuracy with minimal wobble. Each rotational axis shall be equipped with home and angular limit switches. The system shall be capable or returning each rotational axes to a home position with an uncertainty of no more than 0.01-degrees. Motion control hardware and software shall be provided to drive (in parallel) all the rotational drive motors. The motion control hardware shall have an IEEE-488 or RS-232 interface for controlling the goniometric motions from an external personal computer. NIST will furnish the computer with IEEE-488 and RS-232 interfaces. All cable and connections (motor, limit and home switches, and encoder signals) shall be managed in such a manner as not to impede the motion of the rotational stages and to minimize interference with our incident and diffracted x-ray beams. The vendor shall furnish control software for moving the rotational stages to obtain specimen, and detector angles specified by the user as Eulerian angles. Award decision will be based upon the best value to the Government, with technical merit as well as price being used to evaluate offers. As the technical merit becomes more equal, price becomes a greater factor. Procurements under Simplified Acquisition Procedures ($100,000 or less) are set-aside for small businesses unless small businesses cannot meet the need at a reasonable price. Requests for bid packages are due via mail or fax on or before January 15, 1998. (0364)

Loren Data Corp. http://www.ld.com (SYN# 0160 19980102\66-0006.SOL)


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