Method and apparatus for measuring the liquid level of containers

摘要

A method and apparatus for measuring the liquid level in each of a plurality of containers in which each bottle passes in succession on a conveyor belt past a measuring station and between a radiation source and detector at the station. Each bottle is detected as it reaches the station to trigger actuation of the radiation source for a given number of time periods. Each period is of fixed duration and the time between periods is varied in accordance with the speed of belt and container so that each container receives the same radiation regardless of its speed.