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Spectrum analyzer

About: Spectrum analyzer is a research topic. Over the lifetime, 12217 publications have been published within this topic receiving 101851 citations.


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Patent
10 Jun 1985
TL;DR: In this paper, a rotating analyzer type ellipsometer is used for receiving light which is impinged on a sample with a predetermined incident angle and reflected by the sample, a rotary phase detecting apparatus provided so as to rotate unitarily with the rotating analyzers, and a computer for obtaining a phase difference φo with which a difference between an output Ip of the photodetector and a theoretical value Io becomes a minimum or substantially zero.
Abstract: A rotating analyzer type ellipsometer comprises a rotating analyzer for receiving light which is impinged on a sample with a predetermined incident angle and reflected by the sample, a rotary phase detecting apparatus provided so as to rotate unitarily with the rotating analyzer for generating a rotary phase signal as the rotary phase detecting apparatus rotates, a rotating mechanism for rotating the rotating analyzer and the rotary phase detecting apparatus, a photodetector for producing an output responsive to light which is passed through the rotating analyzer, and a computer for obtaining a phase difference between the rotating analyzer and the rotary phase detecting apparatus from a phase difference φo with which a difference between an output Ip of the photodetector and a theoretical value Io becomes a minimum or substantially zero by entering into the computer the output Ip of the photodetector and calculating the theoretical value Io while changing the values of the output Ip and an initial value φo of the phase difference.

35 citations

Journal ArticleDOI
TL;DR: In this article, a millimicrosecond time analyzer was described for artificial pulses of 0.1 V minimum amplitude and some mΜs width, the resolving power is about 5.10-11 s. The instrument works on frequency conversion of two high frequency synusoidal damped waves ballistically excited by the input pulses.
Abstract: A millimicrosecond time analyzer is described. For artificial pulses of 0.1 V minimum amplitude and some mΜs width, the resolving power is about 5.10-11 s. The instrument works on frequency conversion of two high frequency synusoidal damped waves ballistically excited by the input pulses.

35 citations

Journal ArticleDOI
TL;DR: Using Bragg diffraction optics focusing conditions for a triple-axis setup equipped with a bent Si single crystal monochromator and analyzer for investigation of stress fields in polycrystalline materials are derived as mentioned in this paper.
Abstract: Using Bragg diffraction optics focusing conditions for a triple-axis setup equipped with a bent Si single crystal monochromator and analyzer for investigation of stress fields in polycrystalline materials are derived. Results of experimental tests of such a setup are presented. Further it is demonstrated that if certain focusing conditions for a bent monochromator are fulfilled the beam diffracted by a polycrystalline sample becomes quasi-parallel which enables high resolution measurements directly with a PSD without the use of a collimator or a crystal-analyzer. In the three axis setup maximum sensitivity in determination of Δdd ≤ 10−4 can be achieved permitting profile-broadening analysis for reasonable sample volumes and counting times.

35 citations

Journal ArticleDOI
TL;DR: An ir analyzer employing gas-filter correlation techniques has been designed and constructed to measure the concentrations of CO, NO, SO, SO(2), HCl, and HF in the stacks or ducts of stationary pollutant sources.
Abstract: An ir analyzer employing gas-filter correlation techniques has been designed and constructed to measure the concentrations of CO, NO, SO(2), HCl, and HF in the stacks or ducts of stationary pollutant sources. Use of a retroreflector allows the stack to be double passed, and no sample is extracted. For each gas, small interchangeable fixed-position grating polychromators are used as narrow (~1.5-cm(-1)) multiband spectral filters with the bands corresponding to locations of selected absorption lines. The approximate useful ranges (in parts per million-meters) over which this analyzer operates are 10-4000 for NO, 10-1500 for CO, 50-40,000 for SO(2), 10-2000 for HC1, and 5-200 for HF. The discrimination against other gases and particulates is excellent. The analyzer has been tested in the laboratory and on a variety of pollutant sources.

35 citations

01 Jan 1976
TL;DR: A review of the historical development of the electrical aerosol analyzer is given in this paper, followed by a detailed description of the operating principle of the device, including the charger, the mobility analyzer, and the electrometer current sensor.
Abstract: A review of the historical development of the Electrical Aerosol Analyzer is given This is followed by a detailed description of the operating principle of the device, including the charger, the mobility analyzer, and the electrometer current sensor The data reduction procedures are described, and in addition to the standard procedure used previously, a new procedure is described which can further reduce the data reduction errors for the instrument

35 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
2023256
2022568
2021155
2020287
2019361