Abstract: A device for verifying the calibration of an infrared sensor includes a body configured to be placed in orbit. The body defines a spin axis and an outer surface. The outer surface has an infrared radiant intensity that is substantially independent of the viewing angle between the spin axis of the body and the infrared sensor. The device may be used for on-orbit verification of the calibration coefficients associated with each pixel of an infrared sensor, including linearity calibration and verification of the resolution capability of the sensor. The calibration coefficients may be verified over the entire sensing capability range of the infrared sensor. After a thermal model of the device is developed, the device operates passively and provides a known source of infrared radiation observable during the device's entire orbital lifetime. The device may be designed to automatically de-orbit from space after a predictable time in orbit.

Abstract: A valve comprising an electromagnetic solenoid assembly, a valve assembly, and a fastening device is provided. The fastening device is configured to removably couple the electromagnetic solenoid assembly to the valve assembly. The fastening device is retained by the electromagnetic solenoid assembly when the electromagnetic solenoid assembly is uncoupled from the valve assembly. The valve assembly may include a valve body having a valve seat surface and a valve element having a seating surface to seat against the valve seat surface. The valve seat surface may include a resilient sealing element and a hard stop element, such that the valve element in a closed, seated position provides a substantially zero leakage valve closure.