Optical Sensing and Control of Polymer Processing

A NIST/industry consortium identified accurate temperature distribution measurements, as one of the major technical needs of polymer processors. NIST developed a way to make spatially resolved temperature measurements. Add a small amount of dye. During processing, focus UV illumination onto a small volume element of the process material. Use the ratio of the resulting fluorescent intensities at two wavelengths to determine the temperature. Move the focal point up and down to construct temperature profiles. The proposed Phase 1 would evaluate the feasibility of this technology for meeting the stated need. We would build a prototype with improved spatial resolution, motorized positioning and a spectrometer rather than filters for detection. Results would include the prototype, a characterization of its performance, range of operation and the influence of process and material conditions, and a comparison with the needs of industry. A negative outcome in Phase 1 would imply that some fundamental limitation exists. A positive outcome would imply that the technology can probably meet industry's needs.