| Pat.#3995212: | Apparatus and method for sensing a liquid with a single wire transmission line | ||
| INVENTORS: | Ross; Gerald F., Lexington, MA | ||
| ASSIGNEES: | Sperry Rand Corporation, New York, NY | ||
| ISSUED: | Nov. 30, 1976 | ||
| FILED: | Apr. 14, 1975 | ||
| ABSTRACT: A method and apparatus for measuring the level and dielectric constant of a liquid which includes a device for generating a subnanosecond baseband pulse that propagates through a transition device to a single wire transmission line that extends through an air filled region into the liquid. A discontinuity created at the air liquid interface produces a reflection of the baseband pulse that is compared with the transmitted pulse with respect to time of arrival and amplitude to determine the liquid level and the reflection coefficient at the air liquid interface. The reflection coefficient is then utilized to determine the dielectric constant of the liquid. | |||