A new method for estimating rain attenuation at high frequencies

2004 ◽  
Author(s):  
F. Khajepiri ◽  
A. Ghorbanii ◽  
H. Amindavar
Keyword(s):  
Rain Attenuation ◽  
New Method ◽  
High Frequencies

New Method to Characterize Magnetic Hysteresis in Soft Ferrites Up to High Frequencies

2006 ◽  
Vol 55 (1) ◽  
pp. 311-315 ◽  
Author(s):  
B. Tellini ◽  
R. Giannetti ◽  
G. Robles ◽  
S. Lizon-Martinez
Keyword(s):  
Magnetic Hysteresis ◽  
New Method ◽  
High Frequencies ◽  
Soft Ferrites

Development of a Non-Contact Precision Measurement Technique Using Optical Frequency Combs

2012 ◽  
Vol 523-524 ◽  
pp. 877-882 ◽  
Author(s):  
Taro Onoe ◽  
Satoru Takahashi ◽  
Kiyoshi Takamasu ◽  
Hirokazu Matsumoto
Keyword(s):  
High Resolution ◽  
Frequency Comb ◽  
High Sensitivity ◽  
Distance Measurement ◽  
New Method ◽  
Optical Frequency ◽  
Optical Frequency Combs ◽  
High Frequencies ◽  
Frequency Combs ◽  
Lock In

We develop a new method for high-resolution and contactless distance measurement based on self frequency beats of optical frequency combs. We use two optical frequency comb lasers with Rb-stabilized repetition frequencies for doing accurate distance measurement. The repetition frequencies of the optical frequency combs are different, thus parts of the high frequencies such as several gigahertz of self beats are beat-downed to several megahertz without an RF frequency oscillator. The phases of the beat signals of several megahertz frequencies are measured by a lock-in amplifier with a high resolution and high sensitivity. The new method is applied to distance measurement for objects which have rough-surface in the distance range of several-meters.

scholarly journals Amendment of the measurement of the equivalent series resistance at high frequencies

2020 ◽  
Vol 5 (2) ◽  
Author(s):  
Huimin Liu ◽  
Baoquan Ai ◽  
Fengguo Li
Keyword(s):  
Linear Relation ◽  
Large Deviation ◽  
Series Resistance ◽  
New Method ◽  
Equivalent Series Resistance ◽  
Low Frequencies ◽  
High Frequencies

A new method is proposed in (Ivković, Marković, Ivković, & Cvetanović, 2017) to measure the equivalent series resistance (ESR) and the inductance of a coil at low frequencies. However, a special phenomenon has appeared at high frequencies. It is found that the intercept has appeared and the measured inductance value had a large deviation from its nominal value. According to the analysis of result, an amended method is proposed in this paper. The inductance value should be amended according to the linear relation between the measured value and the nominal value.

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