Department of Commerce, Mountain Administrative Support Center, Procurement Division, MC3, 325 Broadway, Boulder, CO 80303-3328

66 -- NON-LINEAR ULTRASONIC MEASUREMENT SYSTEM SOL 52RANB50C048 DUE 031395 POC Procurement Technician (303) 497-3221 In the absence of other qualified sources it is the intent of the National Institute of Standards and Technology (NIST) to purchase a Nonlinear Ultrasonic Measurement System from RITEC, Inc., 60 Alhambra Road, Suite 5, Warwick, Rhode Island under the ''other than full and open competition'' procedures, pursuant to 41 U.S.C. 253 (c)(1) - only one responsible source. This system must be compatible with existing computer controlled equipment designed by RITEC and NIST as part of a Cooperative Research and Development Agreement (CRDA). This system contains a very high power tone burst gated amplifier, a superheterodyne receiver, multiple frequency synthesis, quadrature phase sensitive detection, and gated analog integration functions. It has been specifically designed to satisfy the requirements for nonlinear acoustic measurements which include the ability to: (i) transmit at one frequency and receive at another while retaining the phase relationship of signals through the superheterodyne receiver; (ii) transmit simultaneously at two frequencies and receive at the difference between these two frequencies; (iii) transmit simultaneously at two frequencies and receive at the difference between the harmonics of these two frequencies; and (iv) produce high power bursts with computer controllable amplitudes in order to study the relationship between received signals and transmitted amplitude. As a minimum, the equipment shall meet the following specifications: (1) Gated Amplifier: Frequency range from less than 100 kHz to above 15 MHz; (2) Gated Amplifier power output greater than: i) 1 kW for frequency less than 200 kHz, (ii) 2 kW from 200 kHz to 400 kHz, (iii) 4 kW from 400 kHz to 500 kHz, (iv) 5 kW from 500 kHz to 5 MHz, (v) 4kW from 5 MHz to 7 MHz, (vi) 2 kW from 7 MHz to 10 MHz, (vii) 1 kW for frequency greater than 10 MHz; (3) Receiver Type: Superheterodyne with: Frequency Range - 100 kHz to 40 MHz; High Pass Filters - 75 kHz, 500 kHz & 2.5 MHz; Low Pass Filters - 10, 20 & 45 MHz; Intermediate Frequency (IF) - 20 MHz; IF bandwidth - 0.5, 2, & 5 MHz; Detection technique - Quadrature Phase Sensitive Detectors operating at the IF frequency; Maximum Gain - 100 dB from input to output of the detectors; and Gain Control Range - 78 dB in 2 dB steps; (4) Data Acquisition: Gated Analog Integrators, Sample-and-hold circuits, and 12 bit A/D; (5) Frequency sources: Three direct digital synthesizers (DDS) and one 80 MHz quartz clock. The first two synthesizers establish the transmitting frequencies and the third determines the receive frequency. All synthesizers are independently programmable and are coherently gated from the same 80 MHz clock. All other timing functions are derived from this same clock. Interested concerns having the capability to furnish this system have 45 days from the date of this notice to submit a written qualification statement that clearly establishes the firm's capability to meet the above requirement. See Note 22. (0038)

Loren Data Corp. http://www.ld.com (SYN# 0410 19950208\66-0001.SOL)