Patent · US Expired

Method for measuring the filling level in containers and apparatus for performing the method

US4064754A · kind A · utility

17Cited by
2References
19Claims
0Family size

Assignee

Inventor

Key dates

Filing dateDec 29, 1976
Grant dateDec 27, 1977
Priority date—
Expiry dateDec 29, 1996

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01F23/686
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

In a method and apparatus for determining the level of liquid in a container, a vertical gas filled tube is provided in the container. The tube is surrounded by a magnetic float. A magnetic follower in the tube follows the vertical position of the magnet float, and serves as the termination point of an optical measuring path between a light source and a detector. An optical reference path also extends from the light source to a second mirror, which may be mounted at a fixed point in the container or on the opposite side of the follower. The system incorporates means for determining the difference in propagation time of light in the two optical paths.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.