Homodyne coherent demodulation method for fiber laser hydrophone using a 3×3 coupler with gains adjusted real-time for symmetry

2011 ◽  
Author(s):  
Jun-bin Huang ◽  
Yu Li ◽  
Hong-can Gu ◽  
Ri-zhong Li ◽  
Bo Tan ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Real Time ◽  
Coherent Demodulation ◽  
Demodulation Method

Real-time observation of dissipative solitons formation and breaking dynamics in a mode-locked fiber laser

2021 ◽  
pp. 103786
Author(s):  
Dongdong Han ◽  
Yijie Wang ◽  
Zhanqiang Hui ◽  
Zhixing Zhang ◽  
Kaili Ren ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Real Time ◽  
Dissipative Solitons ◽  
Time Observation ◽  
Real Time Observation

Real-Time Monitoring of Coaxial Protection Fiber Laser Welding of Austenitic Stainless Steels

2017 ◽  
Vol 44 (5) ◽  
pp. 0502003 ◽  
Author(s):  
任勇 Ren Yong ◽  
武强 Wu Qiang ◽  
邹江林 Zou Jianglin ◽  
陈乐 Chen Le ◽  
肖荣诗 Xiao Rongshi
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
Real Time ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Real Time Monitoring ◽  
Fiber Laser Welding

A Round Robin Study: Detection of Damage in a Composite Plate With a Real-Time Moving Sensor Measurement Technique

2018 ◽  
Author(s):  
Da-Ming Chen ◽  
Y. F. Xu ◽  
W. D. Zhu
Keyword(s):  
Damage Detection ◽  
Real Time ◽  
Composite Plate ◽  
Detection Method ◽  
Damage Index ◽  
Laser Doppler Vibrometer ◽  
Composite Plates ◽  
Round Robin ◽  
Velocity Response ◽  
Demodulation Method

A worldwide round robin study is sponsored by the Society of Experimental Mechanics to detect damage in a composite plate with a scanning laser Doppler vibrometer (SLDV). The aim of this round robin study is to explore the potential of a SLDV for detection of damage in composite plates. In this work, a curvature-based damage detection method with use of a continuously SLDV (CSLDV) is proposed. A CSLDV can be regarded as a real-time moving sensor, since the laser spot from the CSLDV continuously moves on a structure surface and measures velocity response. An operating deflection shape (ODS) of the damaged composite plate can be obtained from velocity response by the demodulation method. The ODS of the associated undamaged composite plate is obtained by using polynomials to fit the ODS of the damaged plate. A curvature damage index (CDI) using differences between curvatures of ODSs (CODSs) associated with the ODSs from the demodulation method and the polynomial fit is proposed to detect damage. With the proposed curvature-based damage detection method, locations of two possible damage are detected in areas with consistently high CDI values at two excitation frequencies, which are in good agreement with prescribed damage locations.

Sign in / Sign up

Export Citation Format

Share Document