Naval Research Laboratory, Code 3220, 4555 Overlook Ave. S.W., Washington, D.C. 20375-5326

66 -- PARTICLE IMAGE VELOCIMETRY SYSTEM SOL N00173-99-R-HA03 POC Hilda R. Abdon, Contract Specialist, Code 3220.HA, (202) 767-0682, Wayne A. Carrington, Contracting Officer E-MAIL: Click here to forward a request via e-mail, Abdon@Contracts.nrl.navy.mil. This is an amendment to a previously issued combined synopsis/solicitation for commercial items dated 19 February 1999 in response to questions that were submitted for the Particle Image Velocimetry System under N00173-99-R-HA03. Question No. 1: In specification 1.2.2, the solicitation is for a PIV system operating 532 nm, yet there is a requirement for uv transmission through the receiving lens. Lenses that meet the said requirement may not be available from any lens'manufacturer. If a lens is custom made, it will be costly and may not image sharply at both wavelengths of 532 and 300 nm. Clarify the wavelength transmission. Answer: The solicitation requirement is for transmission of > 70% through all of the optics in the near uv (~ 300 nm). Achromatic focusing for this wavelength range is not required. Question No. 2: In specification 1.2.5, typically a camera used for PLIF in the uv wavelength range has an additional gated image intensifier which is not used for PIV. Describe how the camera be capable of acquiring PLIF images. Answer: At a minimum the camera must be capable of acquiring PLIF images in the visible. PLIV image capture capabilities at 300 nm is highly desirable. The solicitation requires technical information to determine how likely PLIV image capture will be at 300 nm. PLIF capability in the uv (vicinity of 300 nm) is not an explicit requirement of the solicitation. Question No. 3: Clarify specification 1.3.6.1, describe further how the data analysis system be capable of utilizing variable number of pixel combinations. Is it possible also to consider 16X16 pixels as one of the smallest practical interrogation area? Answer 3: Solicitation requirement is for a software/hardware capability of 2x2 and 4x4 pixel grouping. The reduction in accuracy and dynamic range are noted. Question No. 4: Is the intensifier included with the camera (for PLIF image capture)? Answer 4: If the camera offered requires an intensifier to record PLIF images, then an intensifier must be included with the camera. Question No. 5: Is the flame doped with fluorescent particles/dye? Answer: No. Question No. 6: For PLIF, is temperature a parameter to be measured, or other species in the combustion? Answer: The temperature measurement by PLIF is not a requirement. Our objective is to image the CH and OH flame radicals. At a minimum the camera must be capable of acquiring PLIF images in the visible. PLIV image capture capabilities at 300 nm is highly desirable. The solicitation requests technical information to determine how likely PLIV image capture will be at 300 nm. PLIF capability in the uv (vicinity of 300 nm) is not an explicit requirement of the solicitation. Question No. 7: What are the seed particles used for? Answer for No. 7: Two types of seed particles will be used depending on the experiment: 0.3 micron diameter alumina particles and < 5 micron diameter water droplets. Question No. 8: Will the system be used for other applications, such as high speed flow? Answer: Higher speed flows will be measured. The solicitation requirement of a 4 microseconds minimum cross-correlation PIV analysis time separation should be sufficient for the anticipated higher flows. Question No. 9: Is intensity part of the measurements? Answer: Intensity must be part of the PLIF measurements. Intensity information is not explicitly required for the PIV measurements. The closing date is revised to 30 March 1999. The solicitation and any amendments to it will be available via the internet and paper copies will not be provided. Synopsis number HA03. Posted 03/17/99 (W-SN309657). (0076)

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