| US 7,482,969 B2 | ||
| Material movement sensing techniques | ||
| Gregory Hilding Huff, College Station, Tex. (US); Jennifer T. Bernhard, Champaign, Ill. (US); Susan Hagness, Madison, Wis. (US); and Debra Laefer, Dublin (Ireland) | ||
| Assigned to Board of Trustees of the University of Illinois, Urbana, Ill. (US) | ||
| Filed on Jun. 14, 2006, as Appl. No. 11/453,259. | ||
| Prior Publication US 2007/0290917 A1, Dec. 20, 2007 | ||
| Int. Cl. G01S 13/89 (2006.01); G01S 13/88 (2006.01) | ||
| U.S. Cl. 342—22 [324/332; 324/337; 342/5; 342/118; 342/179] | 27 Claims |
| 21. A method, comprising:
providing several electromagnetic radiation reflectors within a volume, the volume including solid portions subject to movement
relative to one another, at least a portion of the reflectors being positioned beneath one or more of the solid portions and
moving in response to movement of at least some of the solid portions;
irradiating the volume with electromagnetic radiation, the electromagnetic radiation having one or more frequencies in a range
of one kHz through one THz;
detecting a reflection of at least a portion of the electromagnetic radiation from each of the reflectors in response to the
irradiating; and
evaluating movement among the solid portions from the reflection of each of the reflectors which includes determining a spatial
orientation of each one of the reflectors as a function of at least one of polarization selectivity and frequency selectivity.
|