National Institute of Standards & Technology, Acquisition & Assistance Div.,100 Bureau Drive Stop 3572, Bldg. 301, Rm B117, Gaithersburg, MD 20899-3572

59 -- INSB DETECTORS SOL 53SBNB060125 DUE 080700 POC Brenda K. Lee (301) 975-6394 WEB: NIST Contracts Homepage, http://www.nist.gov/admin/od/contract/contract.htm. E-MAIL: NIST Contracts Office, Contract@nist.gov. The National Institute of Standards and Technology (NIST), intends to negotiate on a sole source basis with Judson Technology, 221 Commerce Drive, Montgomeryville, PA 18936 under authority of FAR 13.106-1(b)(1) for InSb detectors. The Government requires the following four items: 1) Judson Model No. J10D-M210-RO7M-17-NIST; InSb detector with a short window mount, cold FOV aperture located at 8 mm from 7 mm diameter detector, shunt resistance of 25 k? minimum, 17 degree field-of-view (FOV), dewar hold time of 24 hours, sapphire window assembly, Si temperature sensor, customer supplied cold filter to be mounted on FOV assembly, detector centered within +/- 1 mm of dewar optical axis defined as perpendicular center of mounting holes around window when cold, detector plane perpendicular to dewar axis within two degree when cold, detector response non-uniformity is less than 1 % due to position variations, and 20 mil separation between precision aperture and detector. NIST shall provide the precision aperture of 6.4 mm diameter, which has been measured by NIST. Filter change, repump and retest is needed in the existing detector dewar. 2) PA71-INT; Preamplifier mounted in enlarged M210 dewar terminal pin box with three customer specified switch selectable gain settings, includes OPA627 operational amplifier with 400 Hz 3 dB roll-off for all three gains. Frequency response curves provided with the amplifier indicating partial or full frequency compensations. Gain selection optimized for background current of the above InSb detector. 3) Modified Judson Model No. J10D-M210-R07M-17-NIST; InSb detector with dewar extension, cold FOV aperture located at about 50 mm from 7 mm diameter detector, shunt resistance of 25 k? minimum, 17 degree field-of-view (FOV), dewar hold time of 24 hours, sapphire window assembly, Si temperature sensor, customer supplied cold filter to be mounted on FOV assembly, detector centered within +/- 1 mm of dewar optical axis defined as perpendicular center of mounting holes around window whencold, detector plane perpendicular to dewar axis within two degree when cold, detector response non-uniformity is less than 1 % due to position variations, and 20 mil separation between detector and aperture. NIST shall provide the aperture of 6.4 mm diameter. Additional cold filter is needed in NIST existing unit (InSb detector). 4) PA-71-INT; Preamplifier with decadic gain selection mounted in enlarged M210 dewar terminal pin box with three customer specified switch selectable gain settings, includes OPA627 operational amplifier with 400 Hz 3 dB roll-off for all three gains. Frequency response curves provided with the amplifier indicating partial or full frequency compensations. Gain selection optimized for background current of modified InSb detector. NIST shall return both units to Judson Technology for modification. NIST had two contracts with Judson; as a result large area (7 mm diameter) InSb detectors were developed. InSb flashing (instabilities) was eliminated by applying a buried metal coating inside of the detectors. There are no other companies who applied this technology improvement for large area InSb detectors. NIST has already obtained the necessary performance of 7 mm diameter InSb detectors. NIST requires additional detectors of the same improved quality to satisfy the calibration requirements of its customers. The special requirements are large detector area to measure large beam diameters and flashing free operation to obtain high detector sensitivity and stability. The InSb detectors will have relatively low shunt resistance and large junction capacitance. These detectors require matched preamplifiers to achieve high accuracy photocurrent-to-voltage conversion. This means that a preamplifier has to be optimized for signal gain (up to 400 Hz), voltage gain (to minimize noise amplification), and loop gain (which depends on the operational amplifier selection) for a given detector impedance. This requires a separate preamplifier for each detector. The preamplifier and the detector shall be compatible with each other for future applications. Judson Technology is the only source that is known to be able to provide the custom made InSb detectors because they developed the flashing-free large (7 mm) detectors for NIST requirements. The Government requires a one-year warranty. after services are completed on parts and labor. FOB Designation Gaithersburg, MD. The Government requires 1 set of manuals that show test data of each unit. No solicitation package will be issued. The Contractor must be able to meet all the requirements stated herein. This notice of intent is not a request for competitive quotations. However, all quotations received by August 7, 2000 will be considered by the Government. Information received will be considered solely for the purpose of determining whether to conduct a competitive procurement. The anticipated award date of the contract is on or around August 7, 2000. In accordance with FAR 5.207(e)(3), Numbered Note 1 applies. If you have any questions regarding this announcement,please contact Brenda Lee at the telephone number identified above. Posted 07/18/00 (W-SN476111). (0200)

Loren Data Corp. http://www.ld.com (SYN# 0290 20000720\59-0003.SOL)

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