Results 251 to 260 of about 154,815 (302)
Some of the next articles are maybe not open access.
Infrared Detector For Mid-Infrared Astronomy
Astrophysics and Space Science, 1989Recent developments of infrared detectors and arrays for mid-infrared astronomical observations are discussed with an emphasis on technical issues in designing and fabricating photometers and cameras. The discussion includes a small-scale silicon bolometer array being tested at the Steward Observatory.
openaire +1 more source
Physics Today, 1948
Since infrared or heat radiation of wavelength longer than about one micron cannot be detected by visual or photographic means, physicists, besides pushing development of standard radiation detectors such as thermopiles and bolometers, have roamed far afield in their attempts to find new and more sensitive infrared detectors.
openaire +1 more source
Since infrared or heat radiation of wavelength longer than about one micron cannot be detected by visual or photographic means, physicists, besides pushing development of standard radiation detectors such as thermopiles and bolometers, have roamed far afield in their attempts to find new and more sensitive infrared detectors.
openaire +1 more source
Infrared absorber for ferroelectric detectors
Applied Optics, 1994A thin-film, metal-dielectric coating is described that can be used as a nearly ideal IR absorber for ferroelectric and related IR detectors. This coating can provide an absorption of greater than 98% for IR wavelengths over a two-to-one spectral band.
V T, Bly, J T, Cox
openaire +2 more sources
Thallium selenide infrared detector
Applied Optics, 1977The application of semiconducting thallium selenide for ir detection is described. A responsivity of 10(6) V/W and NEP of the order of 10(-15) W/ radicalHz with a response time of 3 msec can be obtained by operating the detector at 1.5 K.
P S, Nayar, W O, Hamilton
openaire +2 more sources
Infrared Spectra of Infrared Detectors
Spectroscopy Letters, 1984Abstract Thermal detectors of infrared (IR) radiation are generally covered with a highly absorbing “black” coating in order to assure that the incident radiation is absorbed.1–3 Essentially, the black material is the prime radiation sensor which becomes warmed by the photothermal effect and in turn warms a secondary sensor or “detector.” There have ...
openaire +1 more source
Applied Physics Letters, 1976
A new class of infrared detectors is proposed and experimental results are presented for a prototype device. The material used is LaF3, an ionic conductor with a capacitance that varies exponentially with temperature. The detectivity of a prototype detector is estimated from measured signal voltages and incident power, and a Johnson noise voltage is ...
A. Sher, C. L. Fales, J. F. Stubblefield
openaire +1 more source
A new class of infrared detectors is proposed and experimental results are presented for a prototype device. The material used is LaF3, an ionic conductor with a capacitance that varies exponentially with temperature. The detectivity of a prototype detector is estimated from measured signal voltages and incident power, and a Johnson noise voltage is ...
A. Sher, C. L. Fales, J. F. Stubblefield
openaire +1 more source
SPIE Proceedings, 2011
Plasmonic has demonstrated the ability to enhance performances of photodetectors at a resonant wavelength. Absorption in a photodetector can reach 100% using nanophotonic plasmonic array. Plasmonic devices are confining light at the interface metal/dielectric, as a consequence, detection volume is smaller (100 to 1000 times) than in usual ...
N. Péré-Laperne +3 more
openaire +1 more source
Plasmonic has demonstrated the ability to enhance performances of photodetectors at a resonant wavelength. Absorption in a photodetector can reach 100% using nanophotonic plasmonic array. Plasmonic devices are confining light at the interface metal/dielectric, as a consequence, detection volume is smaller (100 to 1000 times) than in usual ...
N. Péré-Laperne +3 more
openaire +1 more source
Infrared Detectors: An Overview
Optical Engineering, 1975Infrared detectors are discussed in terms of an equivalent circuit consisting of a photocurrent generator in series with a gain mechanism, both shunted by the detector internal impedance. Detectivity, the usual measure of infrared detector sensitivity, is defined in terms of the parameters of this equivalent circuit.
R. B. Emmons, S. R. Hawkins, K. F. Cuff
openaire +1 more source
On Photosaturation of Intrinsic Infrared Detectors
Applied Optics, 1969The problem dealt with concerns the degradation of an ir detector's performance when operated at background light levels greater than those encountered under normal laboratory conditions. It is shown that the loss in detectivity experienced by photon noise limited intrinsic cells must be attributed to enhanced noise generation resulting from the ...
openaire +2 more sources
Advances in Space Research, 1982
Arrays of detectors sensitive to infrared radiation will enable astronomical observations to be made with shorter observing times than with discrete detectors and with good relative spatial accuracy. Systems using such arrays are being developed for astronomy in several regions of the electromagnetic spectrum.
openaire +1 more source
Arrays of detectors sensitive to infrared radiation will enable astronomical observations to be made with shorter observing times than with discrete detectors and with good relative spatial accuracy. Systems using such arrays are being developed for astronomy in several regions of the electromagnetic spectrum.
openaire +1 more source