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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.


Papers
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Journal ArticleDOI
TL;DR: In this article, the authors studied the transmission factor of the Omicron EA125 analyzer equipped with the universal lens and showed that it is proportional to Ekin−1 for most measuring setups.
Abstract: In this article a study of the transmission factor of the Omicron EA125 analyzer equipped with the universal lens is presented. The procedure is based on a model by Cross and Castle [J. Electron Spectrosc. Relat. Phenom. 22, 53 (1981)] and is applicable to every spectrometer which can be operated in the constant analyzer energy (CAE) and in the constant retarding ratio measuring mode. The advantage of the method is its independence on the sample and on the inelastic mean free path of the electrons. We find that the transmission factor for the CAE mode is proportional to Ekin−1 for most measuring setups. This dependence is predicted by theory for an ideal analyzer. Deviations from this behavior are observed if the retarding ratio for a given kinetic energy is too small. The limit value of the retarding ratio for ideal behavior, i.e., an Ekin−1 transmission factor, depends on the analyzer entrance slit aperture which has been selected.

28 citations

Patent
25 Sep 1985
TL;DR: In this paper, the authors propose a measuring assembly for analyzing electromagnetic radiation, which consists of a linear polarizer, an optically active element, and an analyzer, arranged one behind the other in the beam path.
Abstract: The measuring assembly for analyzing electromagnetic radiation comprises the following structural groups arranged one behind the other in the beam path: at least one linear polarizer (2); at least one optically active element (3) of known optical activity, i.e. known frequency response of the rotation of the polarization plane; and at least one analyzer (4) the polarization direction of which has a fixedly set orientation with respect to the direction of transmission of the linear polarizer. The beam issuing from the analyzer (4) is passed through a photosensitive sensor (7,8) to a measuring circuit. The total intensity of the radiation under investigation is determined in various ways by forming a reference signal, namely by direct measurement with the optically active element temporarily removed from the beam path, by neutralizing a partial beam, or by a beam splitting analyzer. The measuring assembly permits very rapid analysis (up to real time measurement) of electromagnetic radiation at an extremely high resolution without requiring any mechanically movable parts. Fields of application of the measuring assembly are the determination of the optical center of gravity of the radiation, the determination of the spectral characteristic of the radiation, as well as spectrometric and/or photometric examinations of samples.

28 citations

Patent
Glenn1, E Edwin
06 Sep 1977
TL;DR: In this paper, an acoustic detector is moved through a well to detect sound at various levels within the well, and an electrical signal indicative of the detected sound is applied from the acoustic detector by way of a conductor cable to uphole recording equipment including an amplifier, spectrum analyzer, and recorder.
Abstract: An acoustic detector is moved through a well to detect sound at various levels within the well. An electrical signal indicative of the detected sound is applied from the acoustic detector by way of a conductor cable to uphole recording equipment including an amplifier, spectrum analyzer, and recorder. The spectrum analyzer provides a frequency spectrum of the amplified signal from the acoustic detector. This frequency spectrum is recorded for use in the identification of flow leaks through or behind the casing of the well in accordance with predetermined spectrum analysis characteristics of single-phase gas and single-phase liquid leaks.

28 citations

Journal ArticleDOI
TL;DR: Optical frequency stability measurements show that the comb has a reduced sensitivity to environmental fluctuations, and out-of-band ASE rejection is shown to be >36 dB, a tenfold improvement over that of a laser with a 1000 finesse FPE.
Abstract: An optical frequency comb is constructed using a semiconductor gain medium with a fiber-coupled external cavity and stabilized to an intracavity 10,000 finesse etalon, which is temperature stabilized and held in a vacuum chamber at 10−6 Torr. Optical frequency stability measurements show that the comb has a reduced sensitivity to environmental fluctuations. An upper limit on the optical frequency variation of 100 kHz over >12 min of continuous operation is measured using a real-time spectrum analyzer. This measurement is limited by the linewidth of the reference source, and further measurements with a frequency counter show a fractional deviation of 2×10−11 at 50 ms. Furthermore, out-of-band ASE rejection is shown to be >36 dB, a tenfold improvement over that of a laser with a 1000 finesse FPE.

28 citations

Journal ArticleDOI
TL;DR: In this paper, a new type of optical spectrum analyzer is proposed that features the cascade connection of different arrayed-waveguide gratings (AWGs) with different channel spacings through optical switches.
Abstract: A new type of optical spectrum analyzer is proposed that features the cascade connection of different arrayed-waveguide gratings (AWGs) with different channel spacings through optical switches. The spectral resolution of our system is determined by the narrowest channel spacing and its available channels are ten times the original channels of the AWG with the spacing. We demonstrate the analyzer using 100- and 10-GHz spaced AWGs.

28 citations


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