Journal ArticleDOI
Integrating amplifiers using cooled JFETs
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TLDR
The data are seen as indicating that extremely low values of NEP can be obtained for integration times of 1 sec and that longer integrations continue to improve the SNR at a rate faster than the square root of time when background noise is not present.Abstract:
It is shown how a simple integrating amplifier based on commercially available JFET and MOSFET switches can be used to measure photocurrents from detectors with noise levels as low as 1.6 x 10 to the -18th A/root Hz (10 electrons/sec). A figure shows the basic circuit, along with the waveform at the output. The readout is completely nondestructive; the reset noise does not contribute since sampling of the accumulated charge occurs between resets which are required only when the stored charge has reached a very high level. The storage capacity ranges from 10 to the 6th to 10 to the 9th electrons, depending on detector parameters and linearity requirements. Data taken with an Si:Sb detector operated at 24 microns are presented. The responsivity agrees well with the value obtained by Young et al. (1981) in the transimpedance amplifier circuit. The data are seen as indicating that extremely low values of NEP can be obtained for integration times of 1 sec and that longer integrations continue to improve the SNR at a rate faster than the square root of time when background noise is not present.read more
Citations
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Journal ArticleDOI
Recent developments in silicon avalanche photodiodes
TL;DR: In this paper, a review of recent developments in silicon reach-through avalanche photodiodes (RAPDs) is presented, which includes devices with: • Broader spectral response ( quantum efficiency > 60% from 400 to 1000 nm ) • Lower bulk dark-current densities • Lower excess-noise-factor devices ( k eff reduced from.02 to.006) • Multi-element APDs.
Journal ArticleDOI
Infrared detection and imaging
TL;DR: In this article, the physics of infrared detection is presented with emphasis on the electrical properties of semiconductors involved in photoconductors, photovoltaic and thermal detectors, which are the main types of detectors used in arrays.
Book ChapterDOI
Infrared Spectroscopy of Adsorbates on Metals: Direct Absorption and Emission
P. L. Richards,R. G. Tobin +1 more
TL;DR: In many cases, multiple surfaces cannot be used and small signals must be measured that are superimposed on background radiation that can be many orders of magnitude stronger to be successful, an experiment must be both well conceived and well executed as discussed by the authors.
Journal ArticleDOI
Low noise near infrared detection system using InGaAs pin photodiode
I. Mizumoto,S. Mashiko +1 more
TL;DR: In this paper, a low noise detection system using an InGaAs pin photodiode for near infra-red spectroscopic measurement was developed, where the minimum detectable power of 10−16 W was achieved at 1.28 μm wavelength.
Journal ArticleDOI
Calibration and performance of doped-Ge photoconductors for the ISO Long Wavelength Spectrometer
TL;DR: The Long Wavelength Spectrometer (LWS) part of the Infrared Space Observatory (ISO) uses an array of 10 doped-germanium photoconductors to cover the wavelength range 45-180 μm as discussed by the authors.
References
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Journal ArticleDOI
Some aspects of detectors and electronics for X-ray fluorescence analysis
TL;DR: In this article, the authors present some of the less recognized and potentially important parameters of the electronics and detectors used in X-ray fluorescence spectrometers, including window effects, time-dependent background and excess background.