Photonics/Optics

Manufacturing OLED Lighting

Organic Light Emitting Diode (“OLED”) lighting panels are thin planar area light sources that are naturally diffuse, low glare, high color rendering, cool to the touch, highly energy efficient and highly controllable. Together with LED light sources, they compose the solid state lighting technologies that are replacing over 100 years of bulb and tube lighting technologies, just as solid state electronics have replaced the bulbs and tubes used in electronic devices such as radios, computers and displays.

Posted in: Application Briefs, Imaging, Photonics

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‘Internal Fingerprint’ Imaging Offers Deeper Authentication

A new technology developed by researchers from The Langevin Institute (Paris, France) enables subsurface imaging of the finger. The “internal fingerprint,” according to the device’s creators, could provide cheaper, more secure authentication than traditional scanners.

Posted in: Application Briefs, Imaging, Photonics

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Thermal Cycle Qualification of Radiated Solar Arrays for 50 to 133 K Temperatures in Vacuum

A closed loop system needs no liquid helium. NASA’s Jet Propulsion Laboratory, Pasadena, California Solar arrays (radiated or non-radiated) and other technologies are candidate materials for projects in JPL. Some of the projects need to qualify these potential technologies to cryogenic extreme temperatures (from 133 to 50 K or lower). Those technologies need to survive for more than 120 thermal cycles in a thermal vacuum environment to meet three times mission life of the ECM project per JPL design principles. There is not any published thermal cycling qualification data for solar arrays in vacuum to those of cryogenic temperatures. Therefore, an experimental assessment study was undertaken on behalf of the JPL pre-project office for the proposed Europa Clipper mission.

Posted in: Briefs, TSP, Imaging, Photonics

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Downhole Regolith Interrogation with Helium-Assisted Drill and Laser Induced Breakdown Spectroscopy

Marshall Space Flight Center, Alabama It is of great interest to the scientific community to have the ability to analyze drilled boreholes in situ on the surfaces of the Moon and Mars. The goal of this work was to design and fabricate a Downhole Regolith Interrogation with Helium-assisted Drill and Laser Induced Breakdown Spectroscopy (LIBS) system (DIHeDRAL) targeted towards such applications. A DIHeDRAL instrument would provide synchronous exposure and analysis of volatiles using laser pulses, preserve borehole stratigraphy information, assess regolith mechanical properties through drilling telemetry, and analyze sensitive elemental composition.

Posted in: Briefs, Imaging, Photonics

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Large, High-Speed, Precision Optic Indexing Wheel

New wheel would enable more observational modes to be done in a given time. NASA’s Jet Propulsion Laboratory, Pasadena, California Optical indexing wheels, sometimes called “filter wheels,” are used to locate various optics or filters in a beam path to change the observational mode. Large wheels a half-meter in size or larger typically operate slowly, although the loss of a few seconds of time moving from one observation mode to another is not an issue. In certain rare applications, it is desirable to index between a large selection of optics at a faster rate. If the device is intended for space use, the power requirement becomes critical as well. Current indexing wheel designs typically use a central direct-drive motor to avoid the complication of gears, but these designs will draw too much power and work too slowly for certain applications. They also may require an ultrahigh bit encoder to achieve required positioning accuracy. Designers of such devices would readily admit that speed and power efficiency are both increased through the use of a gear reduction, but generally see the use of gears as problematic.

Posted in: Briefs, Imaging, Photonics

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Web-Based Search Service to Support Imaging Spectrometer Instrument Operations

An adaptive matched-filter approach compensates for the context and background characteristics of each scene. NASA’s Jet Propulsion Laboratory, Pasadena, California Imaging spectrometers yield rich and informative data products, but interpreting them demands time and expertise. There is a continual need for new algorithms and methods for rapid firstdraft analyses to assist analysts during instrument operations. Intelligent data analyses can summarize scenes to draft geologic maps, searching images to direct operator attention to key features. This validates data quality while facilitating rapid tactical decision-making to select follow-up targets. Ideally, these algorithms would operate in seconds, never grow bored, and be free from observation bias about the kinds of mineralogy that will be found.

Posted in: Briefs, TSP, Imaging, Photonics

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Hermetic Phototube Housing

Goddard Space Flight Center, Greenbelt, Maryland This innovation is a hermetically sealed case or very small chamber. A photomultiplier tube (PMT) is mounted inside the chamber. The circuit board is also installed inside the chamber with appropriate feedthroughs for signals. An adapter/floating mount called the phototube to light pipe system mount (PLPSM) allows the hermetic PMT housing to attach to the light guide.

Posted in: Briefs, TSP, Imaging, Photonics

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