Abstract:
A hyperspectral calibrator comprises a composite light source disposed within a housing and including an ultraviolet light emitting diode (UV LED) and a phosphor arranged such that a first beam generated by the UV LED is transmitted through the phosphor to produce and emit a calibration beam that is spectrally continuous over a wavelength range extending from 0.4 μm to 0.7 μm, the housing having an output opening and configured to direct the calibration beam emitted from the composite light source to the output opening to produce a calibration beam at the output opening.
Abstract:
An apparatus includes a regenerator configured to transfer heat to a fluid and to absorb heat from the fluid as the fluid flows between a warm end and a cold end of a cryocooler. The regenerator includes an anisotropic thermal layer configured to reduce a flow of heat axially along the regenerator and to spread the absorbed heat radially or laterally in a plane of the anisotropic thermal layer. The anisotropic thermal layer includes at least one allotropic form of carbon. The anisotropic thermal layer could have a higher radial or lateral thermal conductivity and a lower axial thermal conductivity. The anisotropic thermal layer could include carbon nanotubes and/or graphene. The regenerator could include multiple anisotropic thermal layers that divide the regenerator into multiple segments, where the anisotropic thermal layers are configured to reduce heat transfer between adjacent segments of the regenerator.
Abstract:
A structure having a carbon nanotube material having a plurality of carbon nanotubes and an electrically or thermally conductive material disposed on at least a portion of the carbon nanotubes, such electrically or thermally conductive material being chemically bonded to such portion of the carbon nanotubes.
Abstract:
A cryogenic assembly includes a platform configured to support at least one electronic component. A cryocooler is thermally connected to the platform to cool the platform to a cryogenic temperature. A vacuum unit includes a housing that surrounds a cavity configured to receive the platform. The vacuum unit is configured to thermally insulate the cavity from surrounding ambient air surrounding. At least one connector is configured to deliver an electrical signal from a power supply to the cryogenic assembly. The connector includes at least one carbon nanotube interconnect that inhibits heat flow into cryogenic assembly while delivering the electrical signal.