Abstract: A calibration device for a radiometer includes an integrating cavity and a honeycomb blackbody mounted to the integrating cavity. A plurality of emitters are mounted to the exterior rim of the integrating cavity for transmitting narrow band wavelengths of light into and out of the integrating cavity. A controller, selectively, activates one or more emitters to radiate a single narrow band wavelength of light during an ON period and turn OFF during another period. A plurality of reference detectors are also mounted to the exterior rim of the integrating cavity for measuring the intensity of each narrow band radiation outputted from the integrating cavity. The reference detectors are effective in determining changes in intensity output by each of the narrow band emitters from the integrating cavity. The measured changes in intensity outputted by the emitters are used to calibrate the radiometer with the changes traced back to a NIST standard.

Abstract: A system for measuring movement of an object includes a source of light for emitting a beam; an object for receiving the beam from the source and reflecting the beam; and a reflective optic for receiving the beam reflected from the object and again reflecting the beam at a first angle. The system also includes a receiver for receiving the reflected beam from the reflective optic. When the object moves in distance, the reflective optic reflects the beam at a second angle. The reflective optic may be replaced by an equivalent refractive optic(s). The receiver measures movement of the object, based on a difference between the first angle and the second angle. The reflective optic may include a cylindrical reflective optic, or a spherical reflective optic. The refractive optic(s) may include a plano hemispheric refractive optic, or a meniscus refractive optic. The receiver may include a quad-cell imaging system, or a focal plane array (FPA). The source of light may include a laser, or any collimated beam source.