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Research of frequency modulation to amplitude modulation with multi-frequency modulation
SPIE Proceedings, 2013ABSTRACT For better performance of laser coupling in inertial confinement fusion (ICF), beam shaping of the focus spot is required. Among all the beam smoothing methods, the multi frequency modulation smoothing by spectral dispersion (MultiFM-SSD) proposed by LLE has the advantages of the faster smoothing and better operability.
Sui Zhan +5 more
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Frequency Modulation and the Difference Limen for Frequency
The Journal of the Acoustical Society of America, 1969A system for tracking difference limen for frequency (ΔF) is described. The system uses a function generator to frequency modulate a BFO. The amplitude of the modulating voltage is controlled by a recording attenuator. Intuitive spectral analysis of the modulated tone proves to be insufficient and correction factors are given to allow determination of ...
Robert C. Bilger +2 more
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Applied Optics, 1988
We discuss two methods (Zeeman modulation and Doppler modulation) for locking the frequency of a singlemode cw laser to an atomic absorption line. These methods do not require the laser frequency to be modulated directly. In the first scheme the absorption frequency of the atom is modulated via the Zeeman effect; in the second scheme the laser ...
S Derler, A Weis
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We discuss two methods (Zeeman modulation and Doppler modulation) for locking the frequency of a singlemode cw laser to an atomic absorption line. These methods do not require the laser frequency to be modulated directly. In the first scheme the absorption frequency of the atom is modulated via the Zeeman effect; in the second scheme the laser ...
S Derler, A Weis
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Applied Optics, 2009
Frequency modulation to amplitude modulation (FM-to-AM) conversion is an important issue that can prevent fusion ignition with high power lasers such as the Laser MegaJoule (LMJ). On LMJ, most of the FM-to-AM conversion is expected in the so-called frequency conversion and focusing system, which is a nonlinear system.
Denis Penninckx +2 more
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Frequency modulation to amplitude modulation (FM-to-AM) conversion is an important issue that can prevent fusion ignition with high power lasers such as the Laser MegaJoule (LMJ). On LMJ, most of the FM-to-AM conversion is expected in the so-called frequency conversion and focusing system, which is a nonlinear system.
Denis Penninckx +2 more
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Frequency Modulation and Demodulation
2021In this chapter we will learn about frequency modulation (FM) of signals: linear (LFM), sinusoidal (SFM) and arbitrary. We will become familiar with generation of FM signals and their demodulation methods. We will discuss the problem of frequency bandwidth of FM signals and understand significance of the Carson rule.
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Evolution of frequency modulation
Electrical Engineering, 1940SOME 60 years ago the electric-power industry began the development of a system of distribution which all are now agreed was not the right system. I am referring of course to the low-voltage d-c system. The inevitableness of its replacement by the high-voltage a-c system is now obvious to everyone, although the literature of the transition stage ...
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2016
In Frequency Modulation (FM), the frequency of the carrier changes in accordance with the input analog signal, while the amplitude of the carrier remains the same. The modulated carrier contains several spectral components, requiring frequency domain analysis.
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In Frequency Modulation (FM), the frequency of the carrier changes in accordance with the input analog signal, while the amplitude of the carrier remains the same. The modulated carrier contains several spectral components, requiring frequency domain analysis.
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Frequency modulation of transmitter release
Journal of Physiology-Paris, 1993In 1952 Fatt and Katz recorded at a frog neuromuscular junction while stimulating the nerve and found "... that successive endplate potential responses varied in a step-like manner, corresponding to units of miniature endplate potentials" (J Physiol 117, 109-128). This led them to propose that fast neuromuscular transmission is 'quantal'.
J.L. Barker +3 more
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Frequency modulating transducers
Radio and Electronic Engineer, 1969Frequency modulating (f.m.) transducers are instruments whose output frequency is proportional to the measured physical parameter, such as flow (turbine flow meter), radiation (Geiger counter), pressure, density etc. The paper deals with the advantages of using f.m. in process plants and describes some f.m.
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Armstrong's Frequency Modulator
Proceedings of the IRE, 1938When the side bands of an amplitude-modulated signal are shifted 90 degrees and then recombined with the carrier, a frequency-modulated carrier results. In this paper the order and magnitudes of the distortion components of such a frequency-modulated carrier are quantitatively determined assuming an idealized receiver.
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