| 摘要 |
<p>Device for measuring the filling height of a liquid (11) in a receptacle (10). A first acoustic conductor (12) transmits acoustic oscillation from a sound wave generator (14) to the liquid (11), where it is diffused, picked up by a second acoustic conductor (13) and fed to a sound wave sensor (15). A phase difference or transit time difference is calculated between the original and the picked up acoustic signal, said difference varying according to the filling height (19, 20) of the liquid (11). A particular embodiment of said device connects an acoustic conductor (30) in the liquid (11) with the sound wave generator (14) as well as with the sound wave sensor (15). By specially designing the acoustic conductor in a helical manner in the lower area (31) of the receptacle (10), the device is rendered particularly suitable for measuring the fuel level in the tank of a motor vehicle.</p> |
