Measuring and testing – Liquid level or depth gauge – Sight glass
Patent
1982-11-09
1984-12-25
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
Sight glass
350 9623, G01F 2302
Patent
active
044896026
ABSTRACT:
A rod-like apparatus for determining the existing level of liquids in containers, channels or the like has a lightguide 1 to be arranged in a container and comprising a core of a transparent material with a first refractive index and also a transmitter 14 and a receiver 15 for light to be sent through the lightguide 1. In order to be able to measure changes in the filling height in the container in a quasi-analog or analog manner, the lightguide 1, which may have a cladding, is wound about a rod-shaped carrier body of non-uniform cross-section. The non-uniform regions of the carrier body 5 have a form such that the lightguide 1 is shaped so that at the particularly curved regions 10 the conditions for total reflection hold when ambient air is present, while on wetting with liquid the conditions fall below those for total reflection so that light emerges into the liquid.
REFERENCES:
patent: 2620660 (1952-12-01), Goldsmith
patent: 3384885 (1968-05-01), Forbush
patent: 3448616 (1969-06-01), Wostl et al.
patent: 3884171 (1974-10-01), Rodger
patent: 4151747 (1979-05-01), Gottlieb et al.
patent: 4287427 (1981-09-01), Scifres
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