| 摘要 |
<p>An ultrasonic transmitter (E) is subjected to two different wave modes and mounted on a support (2) which simultaneously forms a waveguide. When the transmitter is driven at its axial resonance frequency, ultrasonic waves are transmitted through the liquid to provide a detection signal, and when driven at its radial resonance frequency, ultrasonic waves are generated which propagate along the support (2) to provide an operational control signal. This detector may be used to detect various liquids in a wide range of conditions and is suitable for industrial applications, particularly in safety and control systems.</p> |
