초록 ▼

A liquid boundary level detector employing an open-ended conduit which directs pressure waves toward a liquid boundary layer. The conduit is moved from a starting position toward the liquid boundary and, upon contact with the boundary, there is a change in acoustic impedance within the conduit. This

A liquid boundary level detector employing an open-ended conduit which directs pressure waves toward a liquid boundary layer. The conduit is moved from a starting position toward the liquid boundary and, upon contact with the boundary, there is a change in acoustic impedance within the conduit. This change is monitored and a signal is generated indicative of such contact. Once the initial liquid boundary position is determined, that may become the reference position for subsequent liquid boundary measurements or motions.

대표청구항 ▼

Apparatus for measuring contact between a conduit and a liquid boundary comprising, an open-ended conduit adapted for insertion into a liquid boundary of a liquid body, said open-ended conduit being movable towards and away from said liquid body, pressure wave generating means directing pressure wav

Apparatus for measuring contact between a conduit and a liquid boundary comprising, an open-ended conduit adapted for insertion into a liquid boundary of a liquid body, said open-ended conduit being movable towards and away from said liquid body, pressure wave generating means directing pressure waves into said conduit for establishing a first acoustic impedance, insertion means for moving the open end of said open-ended conduit into said liquid boundary, thereby closing said open end and establishing a second acoustic impedance, said insertion means generating a conduit position signal, detector means for detecting a change in acoustic impedance during insertion of the liquid handling means into the liquid boundary from said acoustic impedance to said second acoustic impedance and for producing an electrical output signal in response thereto, and signal correlating means receiving said electrical output signal and said conduit position signal for indicating liquid boundary position.