Novel Dynamic-response Measurement System For Electro-optic Devices Based On Optical Sampling

2005 ◽  
Author(s):  
M. Saruwatari ◽  
H. Takara ◽  
S. Kawanishi
Keyword(s):  
Dynamic Response ◽  
Measurement System ◽  
Response Measurement ◽  
Optical Sampling ◽  
Electro Optic

scholarly journals Visualization of frequency-modulated electric field based on photonic frequency tracking in asynchronous electro-optic measurement system

2018 ◽  
Vol 11 (4) ◽  
pp. 046601 ◽  
Author(s):  
Shintaro Hisatake ◽  
Koki Yamaguchi ◽  
Hirohisa Uchida ◽  
Makoto Tojyo ◽  
Yoichi Oikawa ◽  
...  
Keyword(s):  
Electric Field ◽  
Measurement System ◽  
Frequency Tracking ◽  
Electro Optic

scholarly journals COMMON CROSSING CONDITION MONITORING WITH ON BOARD INERTIAL MEASUREMENTS

2019 ◽  
Vol 59 (4) ◽  
pp. 423-434 ◽  
Author(s):  
Mykola Sysyn ◽  
Olga Nabochenko ◽  
Ulf Gerber ◽  
Vitalii Kovalchuk ◽  
Oleksiy Petrenko
Keyword(s):  
Dynamic Response ◽  
Condition Monitoring ◽  
Spectral Feature ◽  
Response Measurement ◽  
Railway Traffic ◽  
Railway Infrastructure ◽  
Vertical Accelerations ◽  
Condition Indicator ◽  
Inertial Measurements ◽  
Common Crossing

A railway turnout is an element of the railway infrastructure that influences the reliability of a railway traffic operation the most. The growing necessity for the reliability and availability in the railway transportation promotes a wide use of condition monitoring systems. These systems are typically based on the measurement of the dynamic response during operation. The inertial dynamic response measurement with on-board systems is the simplest and reliable way of monitoring the railway infrastructure. However, the new possibilities of condition monitoring are faced with new challenges of the measured information utilization. The paper deals with the condition monitoring of the most critical part of turnouts - the common crossing. The application of an on-board inertial measurement system ESAH-F for a crossing condition monitoring is presented and explained. The inertial measurements are characterized with the low correlation of maximal vertical accelerations to the lifetime. The data mining approach is used to recover the latent relations in the measurement’s information. An additional time domain and spectral feature sets are extracted from axle-box acceleration signals. The popular spectral kurtosis features are used additionally to the wavelet ones. The feature monotonicity ranking is carried out to select the most suited features for the condition indicator. The most significant features are fused in a one condition indicator with a principal component analysis. The proposed condition indicator delivers an almost two-time higher correlation to the lifetime as the maximal vertical accelerations. The regression analysis of the indicator to the lifetime with an exponential fit proves its good applicability for the crossing residual useful life prognosis.

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