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| Number | Title | Issue Date |
| 5239176 | Tapered optical fiber sensing attenuated total reflectance A radiation transmission fiber for spectroscopic monitoring includes a transmission portion and a sensor portion; the transmission and sensor portions have a continuous core portion and continuous cladding over the core portion throughout the transmission... | 08/24/1993 |
| 5235179 | Evanescent wave liquid level sensor with density compensation An evanescent wave liquid level sensor for measuring the density-compensated level of a liquid in a container. The sensor employs an eccentric core optical fiber fully immersed in the liquid to be measured. Light is injected into one end of the fiber. Som... | 08/10/1993 |
| 4936681 | Optical sensor An optical sensor for converting a physical value into an electric output signal comprises a light source from which a beam of light rays is coupled into a first surface of a photoconductive body. The light rays are totally reflected by one boundary surfa... | 06/26/1990 |
