Patent · US Expired

Method for detecting flooding of a surface

US4929829A · kind A · utility

4Cited by

11References

8Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Hubert Dedden · Bitburg, DE
Eckhard Gieger · Leverkusen, DE
Christian Lauer · Regensburg, DE

Key dates

Filing date	Aug 4, 1989
Grant date	May 29, 1990
Priority date	—
Expiry date	Aug 4, 2009

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01D29/075
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

In the method for detecting the point of immersion or emergence of a solid or porous body into or out of a liquid, surface waves are generated in the liquid and the light coming from a light source and reflected on the surface of the liquid is scanned photoelectrically. Only the alternating light component of the reflected light is detected here and the rectified alternating light signal is compared with a preset threshold value. When the actual value falls below or exceeds the threshold value, a control signal is then generated which can be utilized for control or regulating actions. For detecting the alternating light component, the photoelectric scanning signal is differentiated. Advantageously, scanning of the surface of the liquid is carried out at a plurality of points. The resulting rectified alternating light components can subsequently be added up, and the total value can be compared with the preset threshold value.

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