Results 241 to 250 of about 255,632 (300)

Research of harmonic distortion power for harmonic source detection

2016 17th International Conference on Harmonics and Quality of Power (ICHQP), 2016
The detection of harmonic source is important for harmonic responsibility sharing and mitigation. In this paper, a new indice for harmonic source detection is investigated. This indice is a power component decomposed from apparent power recommended by IEEE Std. 1459-2010, named harmonic distortion power. The theoretical effectiveness of this indice for
null Chang-Song Li, null Zhi-Xuan Bai, null Xian-Yong Xiao, null Ya-Mei Liu, null Yi Zhang   +4 more
openaire   +1 more source

Harmonic detection using wavelet transform

Proceedings. 2005 IEEE International Joint Conference on Neural Networks, 2005., 2006
Power quality is increasingly becoming a major concern due to excessive use of sensitive equipments. Determining the cause of power quality disturbances using various approaches such as neural network and expert system becomes essential in order to take suitable corrective action. In this paper, wavelet transform is proposed to identify the predominant
S. Sangeethapriya, M. Prabhakar
openaire   +1 more source

Harmonic detection using Kalman filter

2016 International Conference on Electrical, Electronics, and Optimization Techniques (ICEEOT), 2016
Now a days, because of utilization of highly non-linear load and power electronic devices, harmonics are generated in the power system. These harmonics create stress on electrical devices connected to the power system. These harmonics also cause failure of devicesand/or create disturbances in performance of devices.
Vidit A. Desai, Sandhya Rathore
openaire   +1 more source

Passive telemetry by harmonics detection

Proceedings of 18th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2002
A wireless method is proposed to read-out a pressure sensor without active electronics in the implant. This passive approach is based on L-C-resonance. It reduces the implant size and improves its long term use since there are no batteries involved.
K. Van Schuylenbergh, R. Puers
openaire   +1 more source

Pitch detection using harmonic histograms

Speech Communication, 1982
Abstract A method of detecting the pitch frequency of voiced speech is described, which exploits the harmonic structure of the short-time spectrum. The technique is to form a harmonic histogram. Pitch is then detected as the frequency of the largest component.
R. Linggard, W. Millar
openaire   +1 more source

An improved harmonic detection algorithm

2017 Chinese Automation Congress (CAC), 2017
Accurate and fast detection of harmonics is the basis for active filters to work regularly. Propose an improved generalized IP-IQ harmonic detection algorithm. Analyzed generalized IP-IQ harmonic detection algorithm, pointed out two advantages of this algorithm: It can separate any order of harmonic and detect harmonic correctly even if the voltage of ...
Wenxin Wang, Zongchao Zhang, Wei Li, Jishun Jiang   +3 more
openaire   +1 more source

DISLOCATION DETECTION THROUGH HARMONIC GENERATION

AIP Conference Proceedings, 2010
A fundamental goal of ultrasonic nondestructive evaluation is to characterize material defects before failure. During material fatigue, dislocations tend to nucleate, becoming sources of stress concentration. Eventually, cracks start to form and lead to material failure.
B. T. Reinhardt, M. Kropf, K. Boudraeu, M. J. Guers, B. R. Tittmann, Donald O. Thompson, Dale E. Chimenti   +6 more
openaire   +1 more source

Alternating current sensor with second-harmonic detection

Applied Optics, 2000
We describe a novel optical sensor based on the Faraday effect for measuring ac. The sensing element is a piece of material of high Verdet constant placed between polarizers. When the angle between the polarizers differs by 45 degrees, a signal of twice the frequency of the ac is generated--in addition to the usual signal with the same frequency as the
J A, Ferrari, C D, Perciante, A, Dubra, A, Arnaud, E M, Frins   +4 more
openaire   +2 more sources

Harmonic saturated spectroscopy for improved atomic detection

Applied Optics, 1980
A novel method for improved cw laser-induced atomic fluorescence detection that we call harmonic saturated spectroscopy takes advantage of the nonlinear response of an optically saturated atomic system to reject background sources of interference. A reduction in background and an improved SNR are demonstrated for sodium detection in an air-acetylene ...
R P, Frueholz, J A, Gelbwachs
openaire   +2 more sources

Oxygen atom detection using third harmonic generation

Applied Optics, 1990
Atomic oxygen has been detected using the four-wave mixing technique of third harmonic generation (THG). Ground state O((3)P(j)) atoms, generated using a microwave discharge, were monitored by focusing a 391-nm dye laser beam into the post-discharge region and observing radiation at 130 nm, near resonant with the 3s (3)S(0)(1)? 2p(4)(3)P(j) transition,
F G, Celii, H R, Thorsheim, M A, Hanratty, J E, Butler   +3 more
openaire   +2 more sources