Sensor for detecting hydrocarbon in a seal

Details Sensor for detecting hydrocarbon in a seal Sensor for detecting hydrocarbon in a seal

2008-05-31

2011-11-15

Look, Edward (Department: 3745)

Rotary kinetic fluid motors or pumps

With inspection, signaling, indicating or measuring means

C415S168200, C073S040000, C250S221000, C250S573000

Reexamination Certificate

active

08057165

ABSTRACT:
A hydrocarbon presence sensor used to detect for the presence of a fuel in a buffer cavity of an inter-propellant seal. A sensor is formed on a rotor shaft in the buffer cavity and an optical imaging device is used to view a change in appearance of the sensor when a hydrocarbon forms on the surface. In one embodiment, the sensor is a coating of porous silicon. In other embodiments, the sensor can be a mirrored or frosted surface on the shaft. A white light source or a laser is reflected off of the sensor and an optical imaging device reads the reflected light to detect for a change in color or intensity of the light to indicate if a hydrocarbon is present on the sensor surface.

REFERENCES:
patent: 6976679 (2005-12-01), Goss et al.
patent: 6984465 (2006-01-01), Canepa et al.
patent: 7687270 (2010-03-01), Crispin et al.

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