TECHNOLOGY TRANSFER OPPORTUNITY: Assembly for Simplified Hi-Res Flow Visualization (LAR-TOPS-348)

NASA’s Technology Transfer Program solicits inquiries from companies interested in obtaining license rights to commercialize, manufacture and market the following technology. License rights may be issued on an exclusive or nonexclusive basis and may include specific fields of use. NASA provides no funding in conjunction with these potential licenses. THE TECHNOLOGY: Researchers at NASAs Langley Research Center have developed a simple, compact, easy-to-use projection focusing schlieren imaging system optical assembly that leverages a light source, a single physical grid element, and polarization optics to enable hi-res flow visualization. The assembly can simply be mounted in front of a camera to enable focusing schlieren imaging capability. The assembly was designed to drastically reduce the complexity and time required to align a focusing schlieren imaging experiment. Conventional focusing schlieren imaging systems and projection-based analogs require cumbersome grid alignment and peripheral resources to function (e.g., separate source and cutoff grids, projectors, specialized software). NASAs system leverages a single physical grid as both the source and cutoff grid, so the system is self-aligned, compact, does not require specialized software, and costs less than other projection-based alternatives. NASAs single grid, self-aligned focusing schlieren optical assembly is attached to a commercial-off-the-shelf camera. It directs light from the light source through a condenser lens and linear polarizer towards a polarizing beam-splitter where the linear, vertically-polarized component of light is reflected onto the optical axis of the instrument. The light passes through a Ronchi ruling grid, a polarizing prism, and a quarter-wave plate prior to projection from the assembly as right-circularly polarized light. The grid-patterned light (having passed through the Ronchi grid) is directed past the density object onto a retroreflective background that serves as the source grid. Upon reflection off the retroreflective background, the polarization state of light is mirrored. It passes the density object a second time and is then reimaged by the system. Upon encountering the polarizing prism the second time, the light is refracted resulting in a slight offset. This refracted light passes through the Ronchi ruling grid, now serving as the cutoff grid, for a second time before being imaged by the camera. Both small- and large-scale experimental set ups have been evaluated and shown to be capable of fields-of-view of 10 and 300 millimeters respectively. Observed depths of field were found to be comparable to existing systems. Light sources, polarizing prisms, retroreflective materials and lenses can be customized to suit a particular experiment. For example, with a high speed camera and laser light source, the system has collected flow images at a rate of 1MHz. To express interest in this opportunity, please submit a license application through NASA’s Automated Technology Licensing Application System (ATLAS) by visiting https://technology.nasa.gov/patent/LAR-TOPS-348 If you have any questions, please e-mail NASA’s Technology Transfer Program at [email protected] with the title of this Technology Transfer Opportunity as listed in this SAM.gov notice and your preferred contact information. For more information about licensing other NASA-developed technologies, please visit the NASA Technology Transfer Portal at https://technology.nasa.gov/ These responses are provided to members of NASA’s Technology Transfer Program for the purpose of promoting public awareness of NASA-developed technology products, and conducting preliminary market research to determine public interest in and potential for future licensing opportunities. No follow-on procurement is expected to result from responses to this Notice.