Method and device for determination of the presenc

专利名称：Method and device for determination of the

presence of a liquid in a container

发明人：LATHER, DIETER, DIPL.-ING.,LINGENBERG,

DIETER, DIPL.-PHYS.

申请号：EP921195.0申请日：19921116公开号：EP04173B1公开日：19950125

摘要：The invention relates to a method and a device for determining whether a liquid(F) is contained in a container (B). In this case, a signal (S1) is fed into an external surface(1a) of the wall (1) of the container (B). If liquid (F) is present at the opposite inner surface(1b) of the wall (1) energy is coupled out there from the signal (S1) into the liquid (F). Thesignal (S1) is measured, attenuated by the amount coupled out, as a reflected signal (S1')at a receiver (E1). It is provided that signals (S1) are fed in at intervals in time and thatreflected signals (S1') are measured. A first threshold value characteristic (6) isdetermined which is an amount less than the respectively largest measured reflectedsignal (5). A second threshold value characteristic (8) is also determined, which is anamount above the respectively smallest measured reflected signal (7). If liquid (F) waspresent before, the absence of the liquid (F) is indicated if a measured, reflected signal(S1') is above the second threshold value characteristic (8). If no liquid (F) was presentpreviously, liquid (F) is indicated if a measured, reflected signal (S1') is below the firstthreshold value characteristic (6). In all other cases, the previous display is confirmed.

申请人：SIEMENS AKTIENGESELLSCHAFT,SIEMENS AG,SIEMENS AKTIENGESELLSCHAFT

地址：DE

国籍：DE

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