Abstract: A method of making a highly sensitive epitaxial germanium low temperature sensor that is superior in the method of production and performance than those currently available. The geometry and sensitivity of the sensor can be tuned to desired temperature ranges, and specifically can operate at cryogenic temperatures. The sensor can be manufactured uniformly and reproducibly in large quantities at relatively low cost in which large area arrays are possible. The applications of the sensors range from conventional low temperature thermometry and control in laboratory and industrial settings, to applications associated with infrared, x-ray, particle and plasma physics and spectroscopy.

Abstract: X-ray diagnostic system. The system includes a source of x-rays which communicates with an x-ray beam concentrator spaced apart from the x-ray source and disposed for receiving x-rays from the x-ray source. An x-ray spectrometer is disposed for receiving x-rays from the concentrator. In a preferred embodiment, the concentrator is formed of a cylindrical spiral of a metal-coated plastic material having a surface for reflecting x-rays. In another embodiment, the concentrator includes a plurality of concentric nested cylinders of a metal-coated plastic material for reflecting x-rays. In yet another embodiment, the concentrator is a glass capillary bundle. The concentrator allows the spectrometer to be spaced away from the source of x-rays such as scanning electron microscope.

Abstract: Multi-element microcalorimeter array. The microcalorimeter array includes at least two microcalorimeter with each microcalorimeter including a detector coupled thermally to a cold bath. Each detector has associated with it a thermal sensor to generate a signal proportional to a rise in the detector's temperature. A single negative voltage feedback JFET preamplifier circuit is connected to each of the detectors and includes a JFET with a gate, the signals from the thermal sensors connected to the gate. The output of the preamplifier circuit is proportional to radiation energy absorbed by the detector. Each detector has a different thermal recovery time so that the detectors can be discriminated. The multiplexing arrangement of the invention makes it possible to reduce the overall number of preamplifier and post-processing channels for a large multi-element array. This reduction in turn significantly lowers the JFET heat load, mass and power requirements for the microcalorimeter array.

Abstract: X-ray diagnostic system. The system includes a source of x-rays which communicates with an x-ray beam concentrator spaced apart from the x-ray source and disposed for receiving x-rays from the x-ray source. An x-ray spectrometer is disposed for receiving x-rays from the concentrator. In a preferred embodiment, the concentrator is formed of a cylindrical spiral of a metal-coated plastic material having a surface for reflecting x-rays. In another embodiment, the concentrator includes a plurality of concentric nested cylinders of a metal-coated plastic material for reflecting x-rays. In yet another embodiment, the concentrator is a glass capillary bundle. The concentrator allows the spectrometer to be spaced away from the source of x-rays such as scanning electron microscope.

Abstract: A broad bandwidth high resolution x-ray fluorescence spectrometer has a performance that is superior in many ways to those currently available. It consists of an array of 4 large area microcalorimeters with 95% quantum efficiency at 6 keV and it produces x-ray spectra between 0.2 keV and 7 keV with an energy resolution of 7 to 10 eV. The resolution is obtained at input count rates per array element of 10 to 50 Hz in real-time, with analog pulse processing and thermal pile-up rejection. This performance cannot be matched by currently available x-ray spectrometers. The detectors are incorporated into a compact and portable cryogenic refrigerator system that is ready for use in many analytical spectroscopy applications as a tool for x-ray microanalysis or in research applications such as laboratory and astrophysical x-ray and particle spectroscopy.