| 摘要 |
<p>A GAS LEAKAGE DETECTION SYSTEM INCLUDES A FLOW PATH, A DUAL MODE VALVE DISPOSED IN THE FLOW PATH, AN ULTRASONIC MEASURING SECTION INCLUDING A PAIR OF ULTRASONIC TRANSDUCERS, DISPOSED IN THE FLOW PATH UPSTREAM FROM THE DUAL MODE VALVE, A FLOW RATE CALCULATION SECTION FOR COMPUTING A FLOW RATE BASED ON A SIGNAL FROM THE ULTASONIC MEASURING SECTION, AND A CONTROL SECTION FOR CONTROLLING THE DUAL MODE VALVE. THE CONTROL SECTION CLOSES OR OPENS THE DUAL MODE VALVE INSTANTANEOUSLY, AND THE FLOW RATE CALCULATION SECTION COMPUTES A FLOW RATE WHEN THE DUAL MODE VALVE IS CLOSED. THUS, GAS LEAKAGE CAN BE DECIDED SUBSTANTIALLY WITHOUT STOPPING A GAS FLOW WHEN A USER IS USING THE GAS.(FIG 2)</p> |
