Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2008-09-22
2011-11-15
Pyo, Kevin (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S577000, C073S29000R
Reexamination Certificate
active
08058635
ABSTRACT:
The invention relates to a device and a method for the continuous optical determination of the fill level of liquids in a liquid tank of a vehicle or airplane which have a refractive index of at least 1.33 at room temperature and at a wavelength of 589 nm. The device has an elongate measurement channel (3) which can be arranged on or in a liquid tank. A light emitting means (8, 8′) is arranged such that light (13, 14) emitted by the light emitting means (8, 8′) is introduced into the measurement channel (3). A detector arrangement (12, 8′) is arranged such that light (10) emitted into the measurement channel (3) by the light emitting means (8, 8′) is incident on the detector arrangement (12, 8′). The wall (15) which defines the measurement channel (3) is designed such that the reflection coefficient for light of the predetermined wavelength or from the predetermined wavelength range is at least 70%, at least for an angle of incidence up to a predetermined limit angle.
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Bebermeier Ingo
Cierullies Sven
M.U.T. Aviation-Technology GmbH
Pyo Kevin
Schwegman Lundberg & Woessner, P.A.
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