LIGHTGUIDE FLOAT-TYPE NON-CONTACT LEVEL GAUGE WITH DIGITAL OUTPUT OF RESULTS Russian patent published in 2009 - IPC G01F23/22 G01F23/30 

FIELD: instrument engineering.

SUBSTANCE: invention refers to control and measurement equipment and can be used for measurement (control) of liquid level in reservoirs. Essence of invention: level gauge includes vertically oriented transparent tube (1) that communicates with controlled reservoir. Float (8) with light source (7) located in this tube forms narrow round (0.2÷0.3 mm) laser beam at some angle α. Round translucent tube there are long flat (planar) beam guides (9) that have two layers. The first layer forms dense semi translucent mirror coating (mirror is inside of beam guide). The second coating layer - light-tight - is complete coating from 3 sides of beam guide that forms cross line code screens (10) from the 4^th side. On the one end of beam guides there are photosensors (photodiodes) (5) connected to decoders (3) with digital output through sharpener-amplifiers (4). Float light source (7) is fed by power transformed by high-frequency generator the output circuit (12) of which is wound over beam guide code sensors.

EFFECT: liquid level non-contact measurement, flow metre readings output is performed in digital form to indicators (2) that can be transmitted to computer (1), for instance for production of liquid level dynamic measurement (or pressure drop).

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