Abstract:
All-reflective coronagraph optical system for continuously imaging a wide field of view. The system can comprise a fore-optics assembly comprising a plurality of mirrors that reflect light rays, about a wide field of view centered around the Sun, to an aft-optics assembly that reflects the light rays to an image sensor. A fold mirror, having an aperture, is optically supported between the fore-optics assembly and the aft-optics assembly. The aperture defines an angular subtense sized larger than the angular subtense of the Sun, and facilitates passage of a direct solar image and a solar thermal load. A thermal control subsystem comprises a shroud radiatively coupled to each fore-optics mirror and the fold mirror. A cold radiator is thermally coupled to each shroud. Heaters adjacent fore optics mirrors and the fold mirror control temperature to provide a steady state optical system to minimize wavefront error.
Abstract:
An apparatus includes a four-braid resistive heater (100, 200), which includes a conductive structure (104, 204) configured to transport electrical currents and to generate heat based on the electrical currents. The conductive structure has first, second, third, and fourth electrical conductors (106-112, 210-212). The first and second electrical conductors are looped around each other along a length of the conductive structure. The third and fourth electrical conductors are looped around each other along the length of the conductive structure. Loops formed with the first and second conductors are interleaved with loops formed with the third and fourth conductors along the length of the conductive structure. The first and third electrical conductors can be electrically coupled together, and the second and fourth electrical conductors can be electrically coupled together.
Abstract:
A system for synchronizing a first clock and a second clock includes a receiver associated with the first clock, configured to receive a remote optical pulse from the second clock. The remote optical pulse has a pulse repetition frequency and spectral characteristics that are known to the local clock. The system also includes a local optical pulse emitter configured to create a local optical pulse at the first clock, and optics configured to align the local optical pulse and the remote optical pulse. The system further includes an interferometer configured to create an interference pattern between the local optical pulse and the remote optical pulse. A controller is provided that is configured to calculate a time delay between the first clock and the second clock based on the interference pattern between the local optical pulse and the remote optical pulse.
Abstract:
A method and a clock distribution node arranged to synchronize one or more remote clocks with a local clock are disclosed. The clock distribution node calculates a first time offset between the local clock and the remote clock from an interference pattern between a spatially aligned local pulse sequence from the local clock and remote pulse sequence from the remote clock; receives a second time offset from a remote node; and applies a time offset value based on a difference between the first and second time offsets to the remote clock to synchronize the remote to the local clock, wherein the local pulse sequence and the remote pulse sequence comprise optical pulse sequences.
Abstract:
A method and a system of processing circuitry for synchronizing a local clock and a remote clock are both disclosed. The method comprises calculating a time offset between the local clock and the remote clock from an interference pattern between a spatially aligned local pulse sequence from the local clock and remote pulse sequence from the remote clock and applying the time offset to a slave one of the local clock and the remote clock to synchronize the slave to match a master one of the local clock and the remote clock. The temporal resolution of the time offset is a fraction of a remote pulse width of the local pulse sequence and a remote pulse width of the remote pulse sequence.
Abstract:
A method and a clock distribution node arranged to synchronize one or more remote clocks with a local clock. The clock distribution node calculates a first time offset between the local clock and the remote clock from an interference pattern between a spatially aligned local pulse sequence from the local clock and remote pulse sequence from the remote clock; receives a second time offset from a remote node; and applies a time offset value based on a difference between the first and second time offsets to the remote clock to synchronize the remote to the local clock, wherein the remote node is arranged to calculate the second time offset based from an interference pattern between a spatially aligned local pulse sequence from the local clock and remote pulse sequence from the remote clock.
Abstract:
A method and a system of processing circuitry for synchronizing a local clock and a remote clock are both disclosed. The method comprises calculating a time offset between the local clock and the remote clock from an interference pattern between a spatially aligned local pulse sequence from the local clock and remote pulse sequence from the remote clock and applying the time offset to a slave one of the local clock and the remote clock to synchronize the slave to match a master one of the local clock and the remote clock. The temporal resolution of the time offset is a fraction of a remote pulse width of the local pulse sequence and a remote pulse width of the remote pulse sequence.