Echo location system which provides for measuring liquid level and flow rate and flow volume of flowing liquids
US4254482A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 14, 1979 |
| Grant date | Mar 3, 1981 |
| Priority date | — |
| Expiry date | Mar 14, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for the automatic measurement of the level, of material in a container and especially of liquid flowing through a channel is described. An echolocation system operates to detect returns of reflected sonic signals from the surface of the liquid in the channel during successive transmission cycles. A source of pulses is provided having a frequency which provides a certain number of pulses corresponding to the travel time of the sonic signals over a distance equal to a maximum predetermined level or head of the liquid in the channel. The time interval between signal transmission and reception is excess of twice the time for travel of the signals between the transmitter and the maximum level of liquid is a measurement of the liquid level in the channel. A first return from a reference reflector disposed in the path of the sonic signals to the surface of the liquid in the channel is utilized in the echolocation system to provide signals for controlling the frequency of the pulses from which the level measurements are obtained. The echolocation system is operative to provide the sonic signals in a burst during a preset interval of time at the beginning of each transmission cycle…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.