Abstract: A temperature sensor comprising a hollow shield including a cone shaped tip portion and a substantially cylindrical portion. The cylindrical portion surrounds a high temperature collection rod (e.g., a lightpipe or optical fiber). The collection rod is arranged to collect radiant energy from the cone shaped tip portion and transmit the radiation to a fiber optic cable attached to the opposite end of the collecting rod.

Abstract: The present invention is directed to bleed air systems which derive air from a compressor. In one embodiment of the present invention, a compressor including three bleed ports is connected in a predetermined manner to a bleed air output connector through three controllable shutoff valves and two check valves. More particularly, the bleed air port connected to the highest pressure compressor stage is connected to the output connector through all three of the shutoff valves. The bleed air port connected to the second highest pressure compressor stage is connected to the output connector through one of the check valves and the second and third shutoff valves. Finally, the bleed air port connected to the lowest pressure compressor stage is connected to the output connector through the second check valve and the third shutoff valve.

Abstract: An improved synchrophasing system for synchrophasing fan spools and engine core spools of one or more "slave" turbofan engines to a "master" engine is disclosed. A fuel control means is provided for modulating the flow of fuel to the slave engines to first synchrophase the operation of the engine fan spools. A variable stator vane control means is provided for then modulating the position of variable stator vanes within the slave engines to synchrophase the operation of the engine core spools.

Abstract: An air bearing slider according to the present invention provides a programmable slider wherein the fly height of the read/write head may be conveniently controlled using electrical signals. In an air bearing slider according to the present invention, the rear of the slider is made to fly lower by altering the angle of attack of a rear air bearing region. In one embodiment of the present invention, a slider configuration includes a first air bearing region at the leading edge of the slider and a second air bearing region at the slider's trailing edge. The first air bearing region includes a tapered region. A deformable central region, including a non air bearing surface, joins the first and second air bearing regions and controls the relative angle between the air bearing surfaces. The relative angle is adjusted by deforming the central region using a layer of piezoelectric material which overlays the central region.

Abstract: A gas turbine engine control system which receives an engine condition and generates a parameter signal representative of the condition. The control system also receives a temperature signal representative of the engine temperature downstream of the engine combustor. A comparator is used to compare the parameter signal with the temperature signal and a nonrecoverable stall output signal is produced when the temperature signal indicates the temperature is greater than a scheduled value for the given parameter signal. The invention also includes a method for monitoring a gas turbine engine comprising the steps of receiving an engine condition and for generating a parameter signal representative of the condition.

Abstract: A color display comprised of red, green and blue picture elements is described. The picture elements are arranged to provide a substantial improvement in the monochromatic line quality of the display. Individual elements of a particular color are arranged to form the vertices of substantially square patterns within the color display. Within each of the substantially square patterns formed by the elements of a single color (e.g., red), the colors not disposed at the vertices (e.g., blue and green) are disposed along a diagonal of the substantially square pattern. In this manner, a series of substantially square patterns of alternating red, green and blue picture elements sharing common diagonals are arranged to form a complete color display.

Abstract: A single floating point that produces the result A.times.B+C with A, B and C being floating point numbers. The operand C is shifted in parallel with the beginning phases of the multiplication. The result is produced after a single addition and normalization, reducing hardware, delay and rounding errors.

Abstract: A color liquid crystal display comprises a liquid crystal interposed between two transparent electrodes. The electrode on at least one side of the liquid crystal comprises a plurality of pixel electrodes, each pixel electrode defining the area of one pixel of the display. Two or more pixels together form a picture element of the color display. One pixel (a chromatic pixel) of each picture element has a color filter covering the pixel. The other pixel (an achromatic pixel) of each picture element has a translucent (noncolored) filter covering the pixel. The translucent filter also covers a peripheral region of each color pixel. The peripheral region of each chromatic pixel (which is covered by both the color filter and the translucent filter) forms a light shield to increase the contrast of the display. A transparent (noncolored) filter is provided over each achromatic pixel to adjust the overall thickness of the liquid crystal, so as to minimize light leakage at the achromatic pixels.

Abstract: A method and apparatus are described which enhance the ablative effect of a UV laser. The ablative effect of a pulsed UV laser is enhanced using a second, longer wavelength pulsed laser. Each pulse of the first laser is followed by or combined with a pulse from the second laser. The etch depth per pulse is controlled by varying the time between pulses from the first and second lasers. The maximum etch depth per pulse occurs at a time separation which is a function of the substrate being etched. The first laser wavelength is selected to be within the absorption spectrum of the unexcited surface molecules of the substrate, while the wavelength of the second laser is selected to be within the absorption spectrum of the surface molecules excited by the incident radiation of the first laser.

Abstract: The present invention is an improved mechanism for the coarse adjustment of a scanning tunneling microscope stage. In the present invention the stage is moved by forces transmitted through rigid wire springs mounted on leaf spring assemblies which transmit the motion from rigidly mounted micrometer adjusting devices. It is intended that the coarse adjustment mechanism of the present invention will provide improved performance over coarse adjustment mechanisms presently available for STM applications.The present invention replaces separate sets of leaf springs for X and Y motion with a single set of four wire springs. This simplifies the design and increases the rigidity and stability by reducing the mechanical path length from the solid base to the X-Y-Z stage. The screw mechanisms are all directly connected to the rigid base. (This is made possible by the additional pairs of wire springs connected from the X and Y screws to the stage.