|
COMMERCE BUSINESS DAILY ISSUE OF JANUARY 2,1998 PSA#2003DOC; 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)
66 - Instruments and Laboratory Equipment Index Page
|
|