Very high frequency noise sources in the littoral zone

2016 ◽  
Author(s):  
Grant B. Deane ◽  
James C. Preisig
Keyword(s):  
High Frequency ◽  
Littoral Zone ◽  
Frequency Noise ◽  
Very High Frequency ◽  
Noise Sources ◽  
High Frequency Noise ◽  
Very High

scholarly journals Использование высокочастотной шумоподобной модуляции для снижения дрейфовых процессов в LiNbO-=SUB=-3-=/SUB=--фазовом модуляторе волоконно-оптического гироскопа

2020 ◽  
Vol 46 (19) ◽  
pp. 11
Author(s):  
Е.В. Востриков ◽  
Д.А. Погорелая ◽  
А.Н. Никитенко ◽  
А.С. Алейник
Keyword(s):  
High Frequency ◽  
Fiber Optic ◽  
Noise Signal ◽  
Frequency Noise ◽  
Phase Modulator ◽  
Fiber Optic Gyroscope ◽  
Frequency Range ◽  
Very High Frequency ◽  
High Frequency Noise ◽  
Very High

In this paper, the phase modulator optical phase drift reduction method is proposed and researched for LiNbO3 multi-functional integrated optical chip as a part of a fiber-optic gyroscope. This approach consists of applying a very high-frequency noise signal to a phase modulator in the range from 20 MHz to 100 MHz, which is outside of a fiber-optic gyroscope operating frequency range. The presented method showed that the increase in very high-frequency noise signal voltage up to around 1.7 half-wave voltages of the phase modulator allows decreasing optical phase drift by more than 4 times in the frequency range below 64.5 kHz.

scholarly journals High-Frequency Noise Sources in Quantum Wells

2002 ◽  
Vol 102 (2) ◽  
pp. 329-335
Author(s):  
L. Ardaravičius ◽  
J. Liberis ◽  
A. Matulionis
Keyword(s):  
Quantum Wells ◽  
High Frequency ◽  
Frequency Noise ◽  
Noise Sources ◽  
High Frequency Noise

Effect of Stimulus Duration on Localization of Direction of Noise Stimuli

1970 ◽  
Vol 13 (4) ◽  
pp. 826-838 ◽  
Author(s):  
Willard R. Thurlow ◽  
James R. Mergener
Keyword(s):  
Stimulus Duration ◽  
Head Movement ◽  
High Frequency ◽  
Thermal Noise ◽  
Low Frequency ◽  
Frequency Noise ◽  
Noise Sources ◽  
Minimum Duration ◽  
High Frequency Noise ◽  
Efficient Performance

Localization of the direction of bursts of thermal noise was measured for both high-frequency and low-frequency bands, as a function of duration of bursts. Durations of 0.3, 1, 2, and 5 sec were used. Subjects were free to move their heads to aid in localization. Subjects were not specially trained in sound localization. With increase in stimulus duration, perception of elevation was slightly improved for low-frequency noise, probably due to increased information from head movement. A minimum duration of the order of 2 sec appears necessary to allow subjects to achieve maximum performance (which still is not very good for these low-frequency stimuli). Perception of the elevation of the high-frequency noise sources we used was relatively good even at the briefest duration; however, variability of judgment was larger at the shorter durations. Perception of front-back source position was much improved for both low-frequency and high-frequency noise when stimulus duration was increased. The results are understandable in terms of the increased possibility for head movement with increase in stimulus duration. It appears that one should use a minimum stimulus duration of about 2 sec if one wishes subjects to approach their most efficient performance.

Study of the Coherence of Acoustic Fields of High-Frequency Noise Sources in a Randomly Inhomogeneous Ocean

2018 ◽  
Vol 64 (2) ◽  
pp. 215-224 ◽  
Author(s):  
A. I. Khil’ko ◽  
I. P. Smirnov ◽  
A. I. Mashonin ◽  
A. V. Shafranyuk
Keyword(s):  
High Frequency ◽  
Frequency Noise ◽  
Acoustic Fields ◽  
Noise Sources ◽  
High Frequency Noise

Street‐Scale Mapping of Urban Radio Frequency Noise at Very High Frequency and Ultra High Frequency

Radio Science ◽  
2019 ◽  
Vol 54 (11) ◽  
pp. 934-948
Author(s):  
Daniel J. Breton ◽  
Caitlin E. Haedrich ◽  
Matthew J. Kamrath ◽  
D. Keith Wilson
Keyword(s):  
Radio Frequency ◽  
High Frequency ◽  
Frequency Noise ◽  
Very High Frequency ◽  
Ultra High Frequency ◽  
Very High
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