Civil Uses of Remotely Piloted Aircraft

The technology effort is identified and assessed that is required to bring the civil uses of RPVs to fruition and to determine whether or not the potential market is real and economically practical, the technologies are within reach, the operational problems are manageable, and the benefits are worth the cost. To do so, the economic, technical, and environmental implications are examined. The time frame is 1980-85. Representative uses are selected; detailed functional and performance requirements are derived for RPV systems; and conceptual system designs are devised. Total system cost comparisons are made with non-RPV alternatives. The potential market demand for RPV systems is estimated. Environmental and safety requirements are examined, and legal and regulatory concerns are identified. A potential demand for 2,000-11,000 RPV systems is estimated. Typical cost savings of 25-35% compared to non-RPV alternatives are determined. There appear to be no environmental problems, and the safety issue appears manageable

Effect of modulation-doping on luminescence properties of plasma assisted MBE-grown GaN/AIGaN quantum well

In order to improve the crystal quality of GaN-based light emitting devices, photoluminescence (PL) characterization of below-gap states in plasma assisted MBE-grown GaN/AlGaN quantum well (QW) structures has been done by utilizing a below-gap excitation (BGE) light in addition to an above-gap excitation light. The decrease of the band-edge PL intensity due to the addition of the BGE of 1.17 eV indicates the presence of an energy-matched below-gap state in the two-wavelength excited PL. In continuation to our previous efficiency improvement by applying modulation-doping to GaAs/AlGaAs QW's. we focused on several undopcd and Si-doped GaN/AlGaN QW's. Experimental results showed that Si modulation-doping reduces the density of below-gap states in the QW region, hence it is promising for increasing internal quantum efficiency of GaN-based QW's

Online-Thermographie als Werkzeug zur Qualitätskontrolle

Die Online-Thermographie ermöglicht in vielen Fällen eine schnelle, berührungslose und in den Prozess integrierte Qualitätskontrolle einer Vielzahl von Produkten. Auch zur Fremdkörpererkennung zum Beispiel in Lebensmitteln eignet sich das Verfahren. Neben Emissivitätsunterschieden können in erster Linie Unterschiede in den thermischen Materialparametern der Messobjekte ausgenutzt werden (Wärmefluss-Thermographie). Besonders gut eignet sich die Wärmefluss-Thermographie zur Erkennung von oberflächennahen Delaminationen, Verklebungsfehlern und dergleichen in nichtmetallischen Verbundwerkstoffen

Quality control of wood-based and composite materials by infrared thermography

The wood-based panel companies face their customer's increasing demand for high and constant quality of their products and for flexible production. At the same time, the cost pressure gets stronger. Quality assurance systems following standards such as ISO/DIN/EN 9000 become more and more important and require a careful monitoring of the production process and preventive measures to avoid production failures. In the view of high production speeds and the large number of different products, process integrated non-destructive testing methods are necessary for these tasks. Some non-destructive testing methods such as ultrasonic or optical techniques are already commercially available. However, these techniques do not always meet the high demands with respect to speed, reliability, and failure detection rate. Consequently, new techniques such as infrared thermography are attracting more and more interest

Verfahren zum Pruefen eines Rotorblatts einer Windkraftanlage und Pruefvorrichtung

DE 102007059502 B3 UPAB: 20090403 NOVELTY - The method involves transmitting a target light beam in a target light beam direction to a rotor blade sweep surface. A reflection of the beam is detected at a impinge point (16) of a rotor blade (13.1) by a detecting device. A laser beam (21) to be measured is transmitted with a laser beam power density, which is larger than target light beam power density, to the impinge point in an electrically controlled manner directly after the detection of the reflection, so that the rotor blade is heated at the impinge point. A temperature distribution at the impinge point is measured. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a testing device for a wind power plant. USE - Method for testing a rotor blade of a wind power plant, in a wind park (claimed). ADVANTAGE - The laser beam to be measured is transmitted with the measuring laser stream power density to the impinge point in an electrically controlled manner directly after the detection of the reflection of the target light stream so that the rotor blade is heated at the impinge point, and the temperature distribution at the impinge point is measured, thus testing the rotor blade in a time saving and cost effective manner