Carderock Division, Naval Surface Warfare Center, Bethesda, MD 20084-5000

20 -- TRIAXIAL MAGNETIC GRADIOMETERS SOL N00167-00-R-0064 DUE 082800 POC Scott Sentz, Contract Negotiator, Code 3324, (301) 227-5822/Contracting Officer, Renee Cairo-Iocco The Naval Surface Warfare Center, Carderock Division (NSWCCD) intends to procure through Other Than Full and Open Competition, triaxial magnetic gradiometers from Ultra Electronics Ltd. Magnetics Division, Part Number GS2, for the Closed Loop Degaussing System (CLDG) that will be installed on the MCM class of ships. The Base Requirement will provide stepladder quantities of 50 or 100 gradiometers. There will also be four Optional Requirements, with each option providing stepladder quantities of 50, 75, 100, or 125 gradiometers. The gradiometer will be a non-developmental item (NDI) with a proven design that is capable of withstanding the rigorous shipboard environment. The gradiometer will meet Grade A Shipboard Shock and Vibration Standards for MCM class ships. The sensing elements of the gradiometers will be enclosed in a watertight enclosure. The gradiometer will consist of two independent triaxial fluxgate magnetometers mounted approximately 8.5" apart. The magnetometers will have a dynamic range of +/- 100,000 nT. The corresponding axes of the two triaxial magnetometers will be differenced to generate three gradient outputs. The gradient outputs will have a dynamic range of +/- 100,000 nT/m. A temperature sensor will be located in the gradiometer probe. The three gradient signals, six magnetometer signals, and one temperature signal will be available to the user at the gradiometer connector. The manufacturer will provide correction matrices that are applied to the raw data to obtain processed data that will meet the following specifications. The processed gradient and magnetometer outputs will be aligned to the case reference to within 0.025 degrees and the alignment will not change by more than 0.0005 degrees per degree C. The processed gradient offsets will be no more than 20 nT/m and will not change by more than 0.7 nT/m per degree C. The processed magnetometer offsets will be no more than 4 nT and will not change by more than 0.1 nT per degree C. The accuracy of the gradient and magnetometer outputs will be no more than 0.05% of applied field and will change by no more than 5 ppm per degree C. Each pair of corresponding magnetometer axes will be accurate to each other to within 0.01% of applied field and will track each other to within 5 ppm/degree C. the gradiometer will have a cal test feature to allow the gradient and magnetometer outputs to be artificially changed by a known amount. When the cal test line is activated the outputs will change as follows: the gradient outputs wil change 10,000 nT/m, +/-20%; the magnetometer outputs for one triax will change 6,000 nT, +/-20%; the magnetometer outputs for the other triax will change 4,000, +/-20%. The CLDG system uses gradiometers to measure the magnetic state of the ship in order to detect and compensate for changes in the ship's permanent magnetization. Most of the gradiometers are located in the ship's engine rooms where the temperature can vary greatly. This potential for significant temperature change requires that the sensor output be extremely temperature independent. NSWCCD intends to procure the base and optional requirements, through Other than Full and Open Competition, with Ultra Electronics Ltd. Magnetics Division, Staffordshire, England WS125QZ. Ultra Electronics Ltd. Magnetics Division is the only known source that is capable of providing an ND1 gradiometer which meets the alignment and temperature coefficient specifications as cited above. Consequently, the FAR cite supporting Other than Full and Open Competition is FAR 6.302-1(a)(2)(ii), only one responsible source and no other supplies or services will satisfy agency requirements. Numbered Notes: 22. Posted 07/10/00 (W-SN473073). (0192)

Loren Data Corp. http://www.ld.com (SYN# 0220 20000712\20-0004.SOL)

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