This paper describe the development of a quasianalog accelerometer which uses an array of acceleration switches. The investigations are based on results or fabricated and evaluated single-microswitch sensors. The new ...
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This paper describe the development of a quasianalog accelerometer which uses an array of acceleration switches. The investigations are based on results or fabricated and evaluated single-microswitch sensors. The new acceleration sensor concept combines the advantage of high EMI immunity and simple signal pre-conditioning circuitry. Important characteristics of the laterally moving cantilevers, such as resonance frequency and switching time, can he determined by a single mask. First test devices have been fabricated by the use of a special sacrificial-layer additive technology. This Microform technology combines UV patterning of very thick photoresist layers and moulding of the resulting patterns by electroplated metals. This technology is used for the fabrication of laterally driven microswitches, each having a different acceleration threshold. tinder an applied acceleration, the cantilever beam deflects laterally and closes a contact with an electrode. With an electrode on each side of the cantilever, two directions of acceleration can be measured. A simulation model has been developed which enables the design of quasianalog sensors for different applications. Different layouts are created to investigate the basic characteristics. The simulation results are verified on a shaker using the fabricated lest structures of a single-microswitch sensor.
This paper describe the development of a quasianalog accelerometer which uses an array of acceleration switches. The investigations are based on results or fabricated and evaluated single-microswitch sensors. The new ...
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This paper describe the development of a quasianalog accelerometer which uses an array of acceleration switches. The investigations are based on results or fabricated and evaluated single-microswitch sensors. The new acceleration sensor concept combines the advantage of high EMI immunity and simple signal pre-conditioning circuitry. Important characteristics of the laterally moving cantilevers, such as resonance frequency and switching time, can he determined by a single mask. First test devices have been fabricated by the use of a special sacrificial-layer additive technology. This Microform technology combines UV patterning of very thick photoresist layers and moulding of the resulting patterns by electroplated metals. This technology is used for the fabrication of laterally driven microswitches, each having a different acceleration threshold. tinder an applied acceleration, the cantilever beam deflects laterally and closes a contact with an electrode. With an electrode on each side of the cantilever, two directions of acceleration can be measured. A simulation model has been developed which enables the design of quasianalog sensors for different applications. Different layouts are created to investigate the basic characteristics. The simulation results are verified on a shaker using the fabricated lest structures of a single-microswitch sensor.
The ability to condition the radiance of laser diodes using shaped-fiber cylindrical-microlens technology has dramatically increased the number of applications that can be practically engaged by diode laser arrays. La...
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ISBN:
(纸本)0819417300
The ability to condition the radiance of laser diodes using shaped-fiber cylindrical-microlens technology has dramatically increased the number of applications that can be practically engaged by diode laser arrays. Lawrence Livermore National Laboratory (LLNL) has actively pursued optical efficiency and engineering improvements in this technology in an effort to supply large radiance-conditioned laser diode array sources for its own internal programs. This effort has centered on the development of a modular integrated laser diode packaging technology with the goal of enabling the simple and flexible construction of high average power, high density, two-dimensional arrays with integrated cylindrical microlenses. Within LLNL, the principal applications of microlens-conditioned laser diode arrays are as high intensity pump sources for diode pumped solidstate lasers (DPSSLs). A simple end-pumping architecture has been developed and demonstrated that allows the radiation from microlens- conditioned, two-dimensional diode array apertures to be efficiently delivered to the end of rod lasers. This architecture enables the generation of pump bemas that are scalable in absolute power with intensities approaching 100 kW/cm2. To date, pump powers as high as 2.5 kW have been delivered to 3 mm diameter laser rods. Such high power levels are critical for pumping solidstate lasers in which the terminal laser level is a Stark level lying in the ground state manifold. Previously, such systems have often required operation of the solidstate gain medium at low temperature to freeze out the terminal laser Stark level population, so as to minimize losses resulting from reabsorption of the laser radiation. The necessity of low temperature operation has rendered such systems impractical for many applications. Our recently developed high intensity pump sources overcome this difficulty by effectively pumping to much higher inversion levels, allowing efficient operation at or ne
The development and implementation are described of the time of flight validation system, a system for the automated diagnosis of a large-scale nuclear physics detector. The diagnostic system is multi-leveled, combini...
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The development and implementation are described of the time of flight validation system, a system for the automated diagnosis of a large-scale nuclear physics detector. The diagnostic system is multi-leveled, combining a single monitoring level based on statistical methods with two model-based diagnostic levels, one operating on structural information and the other using both structural and behavioral models. The later diagnostic level uses a qualitative data model of the detector to provide evidence that is mapped on a continuous basis from observation values to belief in component failure hypotheses. The general architecture is scalable.< >
The development of a high-sensitivity 320 X 244 element MOS area sensor and a novel fixed pattern noise (FPN) suppressing circuit are reported in this paper. The new device incorporates p/sup +/-n/sup +/ high-C photod...
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The development of a high-sensitivity 320 X 244 element MOS area sensor and a novel fixed pattern noise (FPN) suppressing circuit are reported in this paper. The new device incorporates p/sup +/-n/sup +/ high-C photodiodes and double-diffused sense lines. The p/sup +/-n/sup +/ high-C photodiodes provide a large dynamic range and a large saturation signat of 1.4 /spl mu/A with 6-1x W-lamp illumination. The double-diffused sense lines are introduced to vastly improve blooming characteristics, making use of a built-in potential barrier. FPN is proved to stem mainly from inversion charge variations through horizontal switching MOS gate capacitances. A simple high-performance FPN suppressing circuit is proposed which realizes high signal-to-noise (S/N) ratios of more than 68 dB at saturation. The new sensor is tested in a high-sensitivity black-and-white VTR hand-held camera and will find broad applications.
A RECENTLY-DESCRIBED single-dimension self-scanning photodiode array has been seminal to a growing number of modified structures for a variety of applications. The MOS shift register, which controls array scanning, ha...
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A RECENTLY-DESCRIBED single-dimension self-scanning photodiode array has been seminal to a growing number of modified structures for a variety of applications. The MOS shift register, which controls array scanning, has in particular demonstrated considerable versatility and applicability for different array designs. This paper will discuss the tradeoffs in shift register and photodiode structure which set the limits on array performance.
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