Optical waveguides – Optical waveguide sensor
Reexamination Certificate
2005-05-17
2005-05-17
Lee, John D. (Department: 2874)
Optical waveguides
Optical waveguide sensor
C250S227110
Reexamination Certificate
active
06895130
ABSTRACT:
An arrangement for measuring the true position of a diaphragm within a diaphragm valve assembly utilizes an optical probe in conjunction with a reflective surface formed on the backside of the diaphragm membrane. An optical test signal is launched from a source (such as an LED or laser) along a waveguide (such as an optical fiber) so as to impinge upon the reflective surface of the membrane. The reflected test signal is then coupled back into the waveguide and directed toward an optical receiving device. The received optical signal is translated into an electrical signal that is used as an indication of the “state” of the diaphragm. That is, as the diaphragm membrane moves between the “open” and “closed” position, the membrane surface will be deformed and thus modify the amount of reflected optical signal that is directed back into the probe. Therefore, the true position of the diaphragm can be determined by monitoring the generated electrical signal from the optical probe. Position values between the “open” and “closed” positions can also be determined, as well as the fluid pressure on the process side of the diaphragm.
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Lee John D.
Lin Tina M
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