| 摘要 |
<p>Flow rate of a stream (1) of molten radiation emitting material is determined using the signals emitted by two radiation detectors (S1,S2) arranged to receive radiation emitted from a limited section of the material flow at two mutually spaced points along the flow path. Signals from the detectors are fed to circuits (ST1,ST2) which discriminate any pulse like variations (P) exceeding a given smallest amplitude and which are caused by the presence of gas bubbles in the material. A time measuring circuit (RC) measures the time interval between a pulse (P') occurring on the output of the upstream detector (S1) and the next occurring pulse (P') occurring on the output of the downstream detector (S2). A gating circuit (B) is provided in the output of the circuit (ST1) to block the transfer of a signal pulse occurring on the output of the upstream detector (S1) within a given time interval after the preceeding occurrence of a signal pulse of that output. Used for measuring a flow rate of molten glass ceramic or mineral materials. Provides a simple reliable measurement of flow rate without any physical contact with the stream of material.</p> |
