Fibre-optic liquid-level display device

摘要

A fibre-optic liquid-level display device has a first optical fibre (11), assigned to a light source (6), and a second optical fibre (12), assigned to a light detector (9). The two optical fibres (11, 12) are coupled via a fibre coupler (10) to a third optical fibre (13) and a fourth optical fibre (14). The third optical fibre (13) and the fourth optical fibre (14) reach with their ends (3, 15) to different depths into the vessel containing the liquid (1) to be measured. Depending on the level, the light at the ends (3, 15) of the optical fibres (13, 14) is coupled out or reflected and fed to the photodiode (9), with the result that the level range of the liquid (1) can be detected by means of the current of said photodiode. <IMAGE>