Kevex Corporation

Kevex Instruments

Rolf Woldseth

Richard J Bosson

Duane A Spence

For use as a substitute for liquid nitrogen cooled energy dispersive x-ray detection in spectrometry, the present invention comprises a cooper cold-finger having a lithium-drifted silicon detector and FET at one end, and a five-stage Peltier cooling stack thermally connected to the fifth stage through copper braid at the other end, an aluminum heat shield surrounding the cold-finger and thermally connected to the fourth stage of the Peltier cooling stack with a copper braid, a plurality of nylon spiders that support the cold finger within the heat shield and isolate them thermally, a stainless steel cap, a plurality of nylon spiders that support the heat shield within the cap and thermally isolates them, a heat sink in thermal communication with the hot end of the cooling stack, a remote water cooling system piped to the heat sink and mechanically isolated from vibrating the silicon detector, an ion pump to create a high-quality vacuum around the silicon detector, a motor drive to adjust the reach of the silicon detector assembly, a heat sensor, and a tip proximity sensor.

Peltier cooled lithium-drifted silicon x-ray spectrometer

A high resolution alpha particle x-ray energy analysis system, particularly useful in detecting light elements, is disclosed wherein magnetic or electrostatic suppression fields prevent charged particles that create background radiation from reaching a windowless energy dispersive x-ray detector.

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Foster City, CA, United States of America

Rolf Woldseth