What are circulators?

Some articles on circulator, circulators:

Optical Circulator
... An optical circulator is a special fiber-optic component that can be used to separate optical signals that travel in opposite directions in an optical fiber, analogous to the operation of an electronic circulator ... An optical circulator is a three-port device designed such that light entering any port exits from the next ... of the emitted light is reflected back to the circulator, it does not come out of port 1, but instead exits from port 3 ...
Fort St. Vrain Generating Station - Operational Experience - Water Infiltration and Corrosion Issues (Helium Circulators)
... Vrain was one piece of equipment, in particular the helium circulator, illustrated at right ... that helium did not exfiltrate through the circulator while in use ... Circulator bearings featured a timed water injection system in the event of circulator trip ...
Circulator - Types
... Circulators fall into two main classes 4-port waveguide circulators based on Faraday rotation of waves propagating in a magnetised material, and 3-port "Y-junction" circulators based on cancellation of ... Waveguide circulators may be of either type, while more compact devices based on striplines are of the 3-port type ... these differ in behaviour from a true 4-port circulator ...
Hinkley Point A Nuclear Power Station - Gas Circulator Design Problem
... fuel, problems were encountered due to noise from the single stage axial flow gas circulators ... motor driving current in number 3 and 5 gas circulators, the hot run tests were stopped and the gas circuit opened up ... and diffuser sections of the number 3 and 5 gas circulators was observed ...
Nader V. Brewer - 9th Circuit Opinion
... residency requirements for initiative circulators and candidate circulators as if the issues in both are identical ... blessing to North Dakota's residency requirement for initiative circulators ... conclusion and upheld a residency requirement for initiative-petition circulators ...