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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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Patent
19 Feb 2009
TL;DR: A gas analyzer system includes an optical source, an optical filter assembly, a controller, and an analyzer as discussed by the authors, which detects which types of multiple different gases are present in the sample.
Abstract: A gas analyzer system includes an optical source, an optical filter assembly, a controller, and an analyzer. The optical source generates an optical signal. The optical filter assembly includes different optical filters in which to filter the optical signal. During operation, the controller selects sequential application of each of the different optical filters in a path of the optical signal to modulate the optical signal using different frequency bands of optical energy. The modulated optical signal passes through an unknown sample. Based on absorption of the optical signal by the sample gas at different frequencies, the optical analyzer detects which types of multiple different gases are present in the sample.

39 citations

Patent
13 Apr 1981
TL;DR: In this paper, the authors present a digital video analyzer which provides in a single enclosure, waveform displays, composite video line displays, differential gain/differential phase displays, and vector displays, for a number of different video input signals.
Abstract: A digital video analyzer apparatus which provides in a single enclosure, waveform displays, composite video line displays, differential gain/differential phase displays, and vector displays, for a number of different video input signals, the apparatus being capable of displaying the above signals for at least one full horizontal line as selected by the user, and, for a waveform display for at least a full field.

39 citations

Patent
19 Dec 1997
TL;DR: In this article, a spectrum analyzer is placed in a cable modem termination system located in a head-end of a cable television system, which is operable in a first mode to receive a signal having an associated frequency spectrum made up of several channels.
Abstract: A device, system and method are disclosed for locating clean channels for upstream data carriers that are certain to have lower noise levels than the currently utilized channel used for carrying data upstream, thereby enabling intelligent placement of an upstream data carrier in a cable television system utilizing cable modems for two-way data transmission. A spectrum analyzer is placed in a cable modem termination system located in a headend of a cable television system. The spectrum analyzer contains a programmable device comprised of programmable circuitry. The circuitry is operable in a first mode to receive a signal having an associated frequency spectrum made up of several channels. The circuitry also determines a noise level for each of the channels. The circuitry is also operable in a second mode to receive the signal described above and filter the signal to generate several filtered signals where each filtered signal corresponds to one of the channels. The circuitry is also operable in the second mode to monitor another noise level associated with each of the filtered signals. The channels associated with the filtered signals are selected based on the noise levels determined in the first mode.

39 citations

Journal ArticleDOI
TL;DR: In this article, the authors proposed a new method based on the use of maximum length pseudorandom binary sequence (MLBS) but with a specified Fourier amplitude spectrum in order to avoid the said problem.
Abstract: Switched-mode power converters are extensively used to power various electronic loads and processes. The use of low-cost components with high parameter variation together with the requirement of short time to market has set new challenges for the designers such as the necessity to characterize a large number of converters before production ramp-up. It has been shown that the frequency-domain characterization yields most useful information on the quality of a converter. The conventional frequency response analyzers can be used for measuring the responses, but the time required for one measurement is too long for characterizing hundreds or thousands of converters. Recent studies show that the time for single measurement can be drastically reduced by using broadband excitation signals such as the maximum length pseudorandom binary sequence (MLBS). The MLBS excitation signal is not well suited for measuring the voltage or current loop gains because of their sensitivity to the disturbance signals. This paper proposes a new method based on the use of MLBS but with a specified Fourier amplitude spectrum in order to avoid the said problem. The method is verified both with simulation and practical measurements, and the results are compared to the conventional MLBS technique.

39 citations

Journal ArticleDOI
TL;DR: In this paper, a novel CO2 gas analyzer based on infrared ray (IR) absorption is presented sufficiently in this paper, and a novel space-double-beam optical structure is established successfully.

39 citations


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