USEPA, Contracts Mgmt. Div., Cincinnati, OH 45268-7001

66 -- DIGITAL PARTICLE IMAGE VELOCIMETER SOL RFQ 96-71 POC Contact Point, Angela Thompson, (513)366-2005 The USEPA plans to procure on a competitive basis a digital particle image velocimeter (DPIV) which will be used to determine instantaneous spatially resolved velocity vectors in turbulent flow by recording particle displacements and using correlation techniques, which include auto-correlation, auto-correlation with image shift, and cross-correlation with either single or multiple recorders to study flow fields with reversible flow. The system is for use with an existing Argon-Ion laser (Laxel, 4W) in the expanded beam configuration, and requires optical mounts to carry the laser and the rest of the supplied optical hardware. In this configuration the laser beam may need to be chopped using either pulse modulator or shutter techniques and synchronized with a CCD camera. The supplier must integrate EPA's current Laxel laser with the DPIV system to be supplied. Since the laser beam is Gaussian, optics capable of top-hat intensity profile are required with interchangeable cylindrical lenses of the following F.L.-6.xx,-12.xx,-25 mm. In order to capture turbulent flows surrounding various samplers, under often non-ideal (aerosol) seeding conditions, CCD camera featuring macro zoom lens with a frame rate of 30/s and improved high quality image resolution (768xx494) is needed. This implies the need of the Frame Grabber (8 bit resolution or better) with 32 frames on board image memory expandable to 64, and capable of simultaneous I/O (input and output) of the bitmaps to prevent memory fill-up. High acceptance rate, adjustable up to 100 MB/sec is needed. Consequently a 200 Mhz Pentium PC needs to be incorproated in the DPIV system, featuring 64 MB RAM and 10 GB HD. PC should have Hi-Resolution (1280x1024), 0.25 mm Dot Pitch, 17'' color monitor. Delivery address is USEPA, S-111, Annex, Alexander Drive, Research Triangle Park, NC 22711. Requests for RFQ 96-71 must be in writing to the above address or faxed to Angela Thompson at 513/366-2107. Telephone requests will not be honored. This is an unrestricted acquistion. All responsible sources may submit a bid which will be considered by the Agency. (0197)

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