| 摘要 |
<p>A method of detecting the displacement of a target in a given environment comprises storing reference data comprising data representative of the environment; transmitting a transmit signal towards the target; sensing the return signals from the target and the environment; and detecting the displacement of the target by comparing the return signals and the stored reference data. A method of detecting the level of a sample in a container is also disclosed. Analogous apparatus features are also disclosed.</p> |
