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Nano Memory



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New Products

The MDrive 14Plus Motion Control system from Intelligent Motion Systems (Marlborough, CT) combines the motor, driver, controller, and encoder in one system using a NEMA size 14 brushless 1.8-degree motor. It measures 1.9 x 1.4 x 2.0" and includes a programmable controller and programming instruction set. Communication is via RS-422/485 or optional CANopen. The system includes up to eight 5V to 24V general- purpose I/O lines, one 10-bit analog input, 0 to 5 MHz step clock rate, and 20 microstep resolutions up to 51,200 steps per revolution. Optional closed loop control is available.

Posted in: Blog

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Long-Life Pump



Posted in: Blog

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Low-Distortion Imaging Spectrometers

Distortion would be minimized by use of modified Offner optics. "Pushbroom" imaging spectrometers of a proposed type would exhibit little or no distortion in either the spectral or spatial direction. These spectrometers would feature modified Offner optics, which afford a desirable combination of compactness and a high degree of optical correction. Although Offner optics have been used in some spectrometer designs, their potential for eliminating distortion does not appear to have been exploited.

Posted in: Physical Sciences, Briefs

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First-Order Theory of Control of Motion of a Crane and Load

Suitably modulated motion of the crane could prevent swinging of the load. A first-order mathematical model has been developed in a theoretical study of the dynamics of a load suspended by a cable from a crane that moves along a straight track. The model is the basis of a proposed method of computer control of the velocity as well as the position of the crane to minimize or prevent swinging of the load. (Traditionally, only the position of the crane is controlled; there is no engineering provision against swinging of the load.) Velocity and position control to prevent swinging would be highly desirable, especially in situations in which there are requirements for precise placement of large loads and/or the delays incurred in waiting for damping of pendulum oscillations of loads are unacceptable. Because most modern cranes are already controlled by computers and include position-indicating control subsystems, the implementation of this method of control would entail little or no additional equipment and thus should be relatively inexpensive.

Posted in: Mechanical Components, Briefs

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Hardware and Software for Air-to-Air Schlieren Imaging

Accurate positioning and camera control are necessary for success in schlieren imaging. Software and electronic hardware are being developed to provide cockpit guidance and camera control for an air-to-air schlieren photography system that is to be used to take high-resolution pictures of shock waves generated by a full-scale airplane (see Figure 1). For success in schlieren imaging, it will be necessary to position two airplanes — an observing airplane and the one generating the shock waves — precisely along a line of sight to the Sun, which will be used for illumination. The shock-wave-generating airplane will fly at supersonic speed, while the observing airplane will have to fly at a much lower speed of 250 knots (129 m/s).

Posted in: Tech Briefs, ptb catchall, Photonics, Briefs

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A Multifunctional Active-Excitation Spectral Analyzer

A portable, near-room-temperature instrument would optically probe chemical compositions of surfaces. A highly sensitive, low-power, low-noise multifunctional active-excitation spectral analyzer (MAESA) that would span the wavelength range of 0.5 to 2.5 µm and would operate near room temperature is undergoing development. The fully developed MAESA is expected to be a portable and highly miniaturized version of a prototype of the instrument that has been demonstrated in a laboratory. The MAESA is intended primarily for use in remote sensing of chemical compositions of mineral surfaces on planets or on Earth.

Posted in: Tech Briefs, ptb catchall, Physical Sciences, Briefs

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