نتایج جستجو برای: ndfeb
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INTRODUCTION Because they have higher isolation and lower insertion loss compared to semiconductor switches, the last decade has seen the development of several types of MEMS (Micro Electro Mechanical Systems) switch. Many of these are electrostatically actuated and so need high drive voltages, limiting the initial gap between the contact points to a few micrometers [1-3]. Such small gaps betwe...
Novel developments in X-ray based spectro-microscopic characterization techniques have increased the rate of acquisition of spatially resolved spectroscopic data by several orders of magnitude over what was possible a few years ago. This accelerated data acquisition, with high spatial resolution at nanoscale and sensitivity to subtle differences in chemistry and atomic structure, provides a uni...
This paper reports a micromachined Geiger counter with integrated permanent magnets that enhance the RF transmission from the discharges initiated by incident beta particles. With the intent of wireless sensing within the ultra wideband (UWB) spectrum, the transmission in the 2.0-2.8 GHz frequency range is investigated. The device consists of a 1x2 cm micromachined glass/Si cavity sandwiched be...
We describe a micromachined optical fiber current sensor. The sensing element consists of a squared silicon membrane (8 mm long and 20 microm thick) that has a cylindrical permanent magnet (NdFeB alloy, 3-mm diameter, 1.5 mm high) fixed on its central region. This structure allows the permanent magnet to vibrate in the presence of the magnetic field gradient generated by an ac. A linear relatio...
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