Simultaneous multichannel pulse compression for broadband dynamic dispersion compensation

2004 ◽  
Author(s):  
M. Sauer ◽  
D. Nolan ◽  
M. Li ◽  
G. Berkey
Keyword(s):  
Pulse Compression ◽  
Dispersion Compensation ◽  
Dynamic Dispersion Compensation

Excitation series design and pulse compression synthesis for high-resolution Lamb wave inspection

2018 ◽  
Vol 18 (5-6) ◽  
pp. 1464-1478
Author(s):  
Jiadong Hua ◽  
Liang Zeng ◽  
Jing Lin ◽  
Liping Huang
Keyword(s):  
Lamb Wave ◽  
Pulse Compression ◽  
Lamb Waves ◽  
Dispersion Compensation ◽  
Synthesis Method ◽  
Side Lobe ◽  
Main Lobe ◽  
Window Functions ◽  
Windowing Technique ◽  
Lobe Width

Lamb wave pulse compression is a promising technique for ultrasonic nondestructive evaluation and structural health monitoring, in which the excitation waveform is designed to exhibit attractive auto-correlation characteristics including short main-lobe width and small side-lobe amplitude. However, narrowing main-lobe will increase side-lobe amplitude, and vice versa. Conventional time windowing technique is a balance between main-lobe width and side-lobe amplitude. An improvement over time windowing is proposed using pulse compression synthesis method. In this method, a series of excitation waveforms are used to actuate Lamb waves, each response is processed by pulse compression, and all the compression signals are summed together. The excitation series are constructed as linear chirps weighted with different combinations of rectangular and Hanning window functions. The selection of the combination coefficients is optimized to ensure best signal summation. The effectiveness of the proposed method is demonstrated by an experiment, and the robustness to inaccuracy in dispersion compensation is also evaluated. Application of the proposed method for damage detection is demonstrated by a further experiment.

Semiconductor mirror for optical noise suppression and dynamic dispersion compensation

2003 ◽  
Vol 39 (11) ◽  
pp. 1481-1485 ◽  
Author(s):  
A. Isomaki ◽  
A.-M. Vainionpaa ◽  
J. Lyytikainen ◽  
O.G. Okhotnikov
Keyword(s):  
Noise Suppression ◽  
Dispersion Compensation ◽  
Optical Noise ◽  
Dynamic Dispersion Compensation

Dynamic Dispersion Compensation for the Polarization Coupling Measurement System of Polarization Maintaining Fiber

2012 ◽  
Vol 39 (1) ◽  
pp. 0105001
Author(s):  
张红霞 Zhang Hongxia ◽  
任亚光 Ren Yaguang ◽  
叶雯婷 Ye Wenting ◽  
陈信伟 Chen Xinwei ◽  
贾大功 Jia Dagong ◽  
...  
Keyword(s):  
Measurement System ◽  
Dispersion Compensation ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining ◽  
Dynamic Dispersion Compensation
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