Abstract: Chromatic correction of a Fresnel lens is effected by collecting data at multiple detectors arrayed along the optical axis of the lens and then digitally processing data from each detector to obtain multiple sets of image data corresponding to selected tuned wavelengths associated with the multiple detectors, or to obtain composite multi-color image data. Digital processing includes deconvolving data from each detector with a point spread function (PSF) associated with the tuned wavelength of the detector, and thereby enhancing the image derived from the detector. Two possible techniques are also disclosed for deriving sub-band signal data having a wavelength that falls between the tuned wavelengths of adjacent detectors.

Abstract: A technique for providing high-contrast images of defects in solar cells and solar panels, by illuminating each cell under inspection with broadband infrared radiation, and then forming an image of radiation that is secularly reflected from the cell. Multi-junction solar cells have a metal backing layer that secularly reflects the illumination back into an appropriately positioned and aligned camera, selected to be sensitive to infrared wavelengths at which the solar cell materials are relatively transparent.

Abstract: A technique for providing high-contrast images of defects in semiconductor devices and arrays of such devices, by illuminating each semiconductor device under inspection with broadband infrared radiation, and then forming an image of radiation that is specularly reflected from the semiconductor device. Many semiconductor devices and arrays of such devices have a metal backing layer that specularly reflects the illumination back into an appropriately positioned and aligned camera, selected to be sensitive to infrared wavelengths at which the semiconductor device materials are relatively transparent.

Abstract: Apparatus, and a related method, for eliminating the effect of speckle images caused by surface imperfections in a primary mirror of a stellar coronagraph. Depending on their size, mirror imperfections can result in speckles in a field of view that also includes an image of a distant target planet. By generating a traveling surface wave in the mirror surface, and then tuning the spatial wavelength of the surface wave to approximately match that of a surface imperfection, the speckle image corresponding to that surface imperfection is made to twinkle in irradiance. Tuning the traveling surface wave though a wide range of spatial wavelengths causes each speckle image in turn to be identified by twinkling, while the target planetary image remains unvarying. Accordingly, multiple speckles corresponding to different mirror imperfections may be conveniently eliminated by image processing.

Abstract: A method for remote analysis of materials embedded in a frozen surface, such as in the icy surface of a planetary body. A laser on board a spacecraft irradiates the frozen surface and thereby releases materials in a gas cloud, by a process of desorption. The laser wavelength is selected to maximize the release of substances by the desorption process, which does not fragment materials into their elemental components. An infrared (IR) spectrometer on the spacecraft detects thermal emissions from the gas cloud against a background provided by the frozen surface, and can readily identify a variety of organic, inorganic and biological materials from their thermal spectra.

Abstract: A positioning boom disposed between a space-based observatory platform and its instrument payload provides thermal and dynamic isolation as well as fine pointing and momentum control. The inventive system isolates a sensitive payload from a warm, dynamically noisy spacecraft, which includes a sunshield. Isolation is required in terms of dynamics and heat flow, both in terms of the absolute level and its variance (thermal isolation). The present invention provides intrinsic control over momentum buildup (which is due to the separation of the center of pressure from the center of mass). The space-based platform also provides a view (field of regard) to at least half the sky (in the anti-sun direction).

Abstract: An optical sensor for detecting the presence of laser radiation in locations outside an intended optical path in a high energy laser device. An optical sensor, such as a photodiode, is positioned to receive light through an optical component when it fails to operate properly and laser light burns through the component. The optical sensor preferably includes a diffuser, an optical filter, and electrical circuitry to compare the signal generated by the photodiode with a selected reference signal, and to use the photodiode signal to actuate an alarm indicator and to disable power to the laser source. A thermal detector may be employed as a backup detection device.