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  • 1
    Electronic Resource
    Electronic Resource
    Observing and Calibration Strategies for FIR Imaging with SIRTF (2000)
    Springer
    Experimental astronomy 10 (2000), S. 403-413 
    Details
    ISSN: 1572-9508
    Keywords: FIR detectors ; MIPS ; SIRTF ; space instrumentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present data from a 16×32 array of unstressed Ge:Gadetectors, showing the long time constant responses and hook effectcharacteristic of these devices. This array is half the size of the70 μm imaging array planned for MIPS, the Multiband ImagingPhotometer for SIRTF. We present simulations of the FIR (farinfrared) sky as viewed by a MIPS array, including realistic noiseeffects and extraction of point sources with a standard photometrypackage, showing that the photometric goals of MIPS are attainablewith the current array performance and using standard analysistechniques. Previous calculations by Heim et al. (1998) haddetermined that MIPS would achieve 5-σ detections of ≤1 mJy at 70 μm in 2000 s; the simulations presented hereobtain results consistent with those calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008027931585
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Germanium Blocked Impurity Band (BIB) detectors (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Information is given in viewgraph form. The advantages of the Si blocked impurity band (BIB) detector invented by M. D. Petroff and M. G. Stabelbroek are noted: smaller detection volume leading to a reduction of cosmic ray interference, extended wavelength response because of dopant wavefunction overlap, and photoconductive gain of unity. It is argued that the stated advantages of Si BIB detectors should be realizable for Ge BIB detectors. Information is given on detector development, subtrate choice and preparation, wafer polising, epitaxy, characterization of epi layers, and preliminary Ge BIB detector test results.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA, Ames Research Center, Proceedings of the Third Infrared Detector Technology Workshop; p 85-115
    Format: application/pdf
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  • 3
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    Stressed Ge:Ga photoconductors for space-based astronomy. (Is there life beyond 120 micron) (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Information is given in viewgraph form. Information is given on the characteristics of stressed Ge:Ga, a spring type stress cavity, mounting hardware, materials parameters affecting dark current, and the behavior of low dark current stressed Ge:Ga. It is concluded that detectors exist today for background-limited detection at 200 microns, that researchers are narrowing in on the significant parameters that effect dark current in stressed photoconductors, that these findings may be applied to other photoconductor materials, and that some creative problem solving for an ionizing effect reset mechanism is needed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA, Ames Research Center, Proceedings of the Third Infrared Detector Technology Workshop; p 5-2
    Format: application/pdf
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  • 4
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    Ga:Ge array development (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Work at the University of Arizona and at Lawrence Berkeley Laboratory on the development of a far infrared array camera for the Multiband Imaging Photometer on the Space Infrared Telescope Facility (SIRTF) is discussed. The camera design uses stacked linear arrays of Ge:Ga photoconductors to make a full two-dimensional array. Initial results from a 1 x 16 array using a thermally isolated J-FET readout are presented. Dark currents below 300 electrons s(exp -1) and readout noises of 60 electrons were attained. Operation of these types of detectors in an ionizing radiation environment are discussed. Results of radiation testing using both low energy gamma rays and protons are given. Work on advanced C-MOS cascode readouts that promise lower temperature operation and higher levels of performance than the current J-FET based devices is described.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA, Ames Research Center, Proceedings of the Third Infrared Detector Technology Workshop; p 125-133
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  • 5
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    An ac bridge readout for bolometric detectors (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The authors have developed a bolometer readout circuit which greatly improves the low-frequency stability of bolometric detectors. The circuit uses an ac bias voltage and two matched bolometers and allows stable dc bolometer operation for integration times greater than 10 s. In astronomical applications the readout allows for qualitatively different observation modes (e.g. staring or slow-drift scanning) which are particularly well suited for space observations and for the use of arrays. In many applications the readout can increase sensitivity. The authors present noise spectra for 4He temperature bolometers with no excess noise at frequencies greater than 0.1 Hz. The measured optical responsivity of a bolometer operated with the present readout is the same as that of a bolometer operated with a conventional readout.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: IEEE Transactions on Nuclear Science (ISSN 0018-9499); 36; 946-949
    Format: text
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  • 6
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    Feasibility of KTa(1-x)Nb(x)O3 as a dielectric or pyroelectric microcalorimeter (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: We are developing a dielectric microcalorimeter for X-ray spectroscopy. We will present the results of our measurement of the dielectric permittivity, the spontaneous polarization, and the pyroelectric coefficient of the mixed-crystal quantum ferroelectric KTa(1-x)Nb(x)O3 with a doping of x = 0.012, as a function of temperature and bias voltage across the device. The effects of surface layers on the permittivity and the pyroelectric coefficient are discussed. We also show the signal results from infrared LED and alpha-particle radiation.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: In: EUV, X-ray, and gamma-ray instrumentation for astronomy III; Proceedings of the Meeting, San Diego, CA, July 22-24, 1992 (A93-29476 10-35); p. 380-390.
    Format: text
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  • 7
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    A new thermal sensor for X-ray microcalorimetry (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A concept for a detector is introduced which exploits the significant temperature dependence of the dielectric constant in ferroelectric materials. The concept permits the use of a microcalorimeter without the resistive sensors which are associated with heat dissipation and increased Johnson noise in the electronic conversion circuit. General calorimeter features are listed, and the concepts related to dielectric calorimeters are discussed in terms of operational and detection advantages. The use of the device is delineated both theoretically and experimentally with the results of an operational dielectric material. The mixed-crystal quantum ferroelectric is employed and detects 6 MeV alpha particles while operating at 1.2 K in the first detection conducted. The temperature dependence of the dielectric constant in the materials allows for the elimination of resistive sensors in microcalorimeters, thereby improving the ultimate sensitivity of the instrument.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: High-energy astrophysics in the 21st century; Dec 11, 1989 - Dec 14, 1989; Taos, NM; United States
    Format: text
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  • 8
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    Test results of a prototype dielectric microcalorimeter (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The initial development work on a dielectric microcalorimeter is presented. It focuses on the dielectric properties of the ferroelectric material KTa(1-x)Nb(x)O3 (KTN). Measurements of the temperature dependent dielectric constant are given together with the first alpha particle detection results from a prototype composite microcalorimeter operating at 1.3 K. A nonthermal mechanism for detecting 6 MeV alpha particles in a monolithic KTN sample is also reported.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: EUV, X-ray and Gamma-Ray Instrumentation for Astronomy; Jul 11, 1990 - Jul 13, 1990; San Diego, CA; United States
    Format: text
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  • 9
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    Ion-implanted extrinsic Ge photodetectors with extended cutoff wavelength (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Far-IR Ge detectors fabricated using boron ion implantation are shown to exhibit operating characteristics compatible with requirements for low background applications. Device parameters such as low dark currents, reasonably good sensitivity, and extended wavelength threshold demonstrate that ion-implanted Ge far-IR detectors offer promise for use in astrophysics instrumentation.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Physics Letters (ISSN 0003-6951); 58; 1431-143
    Format: text
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  • 10
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    Optical efficiency of far-infrared photoconductors (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The present optimization of the geometry of far-IR photoconductive detectors with diffraction-limited throughput, on the basis of experimental and theoretical results, gives attention to the internal optical path relative to measured absorption length, photoconductive gain, uniformity of illumination, cosmic ray cross section, and design compatibility with the requirements of one- and two-dimensional arrays. It is demonstrated that a rod-shaped, square cross section detector geometry, having lateral face electrodes and a beveled backface with which to trap the radiation by total internal reflection, exhibits responsivity commensurate with that of the best available detectors in integrating cavities.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics (ISSN 0003-6935); 25; 4127-413
    Format: text
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