Document Type and Number:
Japanese Patent JPH0456947
Kind Code:
B2
Abstract:
A plurality of scanning regions (22) are disposed about the anticipated region of a phase boundary (32) of two media. The change in position of the phase boundary (32) is detected by a scanning means (18) with which each scanning region (22) is scanned and a signal is generated for each of the scanning regions (22). The first media is more radiation-permeable than the second media. A beam path is generated by the scanning means and is detected and evaluated by a discriminator circuit as a logic one. The second media is less radiation-permeable than the first media. The absence of a beam path corresponding to scanning regions in the second media is evaluated by the discriminator circuit as a logic zero. The number of signals per measuring cycle is compared against the actual number of scanning regions (22) to locate and control the position of the phase boundary (32).
Inventors:
HANSUUYURUGEN NOIMAN
ARUTSURU MAISUBERUGAA
ARUTSURU MAISUBERUGAA
Application Number:
JP369884A
Publication Date:
September 10, 1992
Filing Date:
January 13, 1984
Export Citation:
Assignee:
FRESENIUS AG
International Classes:
B01D17/025; B01D17/12; B01D21/26; B04B11/02; B04B13/00; G01N33/48; G05D9/12
Next Patent: JPH0456948