Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1985-12-05
1988-02-09
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
494 10, G01D 534
Patent
active
047243171
ABSTRACT:
A non-contact apparatus is provided for acquiring velocity information off of an internal rotating housing of an Adams-type centrifuge. The apparatus includes a bidirectional transmitter of radiant energy, such as a fiber-optic member, positioned at the axis of rotation of the exterior rotatable housing of the centrifuge. An inner end of the fiber-optic member is positioned adjacent a lower surface of the inner rotatable housing. A ring of reflective, spaced-apart, members is formed on the lower surface of the rotatable housing adjacent the end of the fiber-optic member. Radiant energy from an exterior, fixed, light source is transmitted through the fiber-optic member and is incident upon the rotating ring. Radiant energy reflected off of the reflecting members of the ring passes back through the fiber-optic member and can be sensed in an externally located, stationary optical sensor. The optical sensor generates a train of electrical pulses in response to the incident pulses of reflected radiant energy. The rate of the electrical pulses can be compared to a set point to determine the velocity of the internal motor. Tachometer signals can be acquired off of the outer motor which rotates the outer housing. A control system can process the velocity signals from the internal motor and the outer motor and provide feedback signals thereto for the purpose of causing the internal motor and internal housing to rotate at twice the speed of the outer motor and outer housing.
REFERENCES:
patent: 2454959 (1948-11-01), Barnes
patent: 3471236 (1969-10-01), Pearson
patent: 4162399 (1979-07-01), Hudson
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patent: 4387299 (1983-06-01), Akiyama
patent: 4449191 (1984-05-01), Mehnert
patent: 4507110 (1985-03-01), Boeckel
patent: 4530691 (1985-07-01), Brown
Brown Richard I.
Foley John T.
Baxter Travenol Laboratories Inc.
Flattery Paul C.
Nelms David C.
Price Bradford R. L.
Vargo Paul M.
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