Results 81 to 90 of about 1,781,876 (250)

Characterization and Repetition Rate Locking of a 1 GHz Erbium‐Doped ZBLAN Waveguide‐Chip Comb Laser

Laser &Photonics Reviews, EarlyView.
A compact, erbium‐doped ZBLAN waveguide chip mode‐locked laser that self‐starts, delivers stable ultrashort pulses, and repetition rate locked to a 1 GHz radio‐frequency reference. The laser produces near transform‐limited 324 fs pulses and 12 nm bandwidth with low noise and long‐term stability, with potential applications in optical frequency ...
Wen Qi Zhang, Nicolas Bourbeau Hébert, Dale E. Otten, Colin Hall, David G. Lancaster   +4 more
wiley   +1 more source

Optical Fiber Demodulation System with High Performance for Assessing Fretting Damage of Steam Generator Tubes

Sensors, 2018
In order to access the fretting damage of the steam generator tube (SGT), a fast fiber Fabry-Perot (F-P) non-scanning correlation demodulation system based on a super luminescent light emitting diode (SLED) was performed. By demodulating the light signal
Peijian Huang, Ning Wang, Junying Li, Yong Zhu, Jie Zhang, Zhide Xi   +5 more
doaj   +1 more source

Simultaneous ToF/FMCW LiDAR Using a Dual‐Mode Light Source in a Single Architecture

Laser &Photonics Reviews, EarlyView.
A simultaneous ToF/FMCW LiDAR architecture is demonstrated using a dual‐mode light source that alternately generates optical pulses and frequency‐chirped light within a single acquisition. By combining time‐domain ToF and coherent FMCW ranging, the system achieves high‐resolution ranging and velocity sensing while extending the measurable range beyond ...
Gyeongmin Kweon, Wontae Choe, Sang Min Park, Chang‐Seok Kim, Gyeong Hun Kim, Hwidon Lee   +5 more
wiley   +1 more source

Femtosecond‐Laser‐Inscribed Cladding Fiber Bragg Gratings: Architectures, Design Trade‐Offs and Future Sensing Opportunities

Laser &Photonics Reviews, EarlyView.
Femtosecond‐laser inscription enables precise positioning of fiber Bragg gratings within the cladding, introducing new spatial and modal design freedoms. Auxiliary‐waveguide, near‐core evanescent‐field, and direct cladding‐mode‐excitation architectures provide complementary pathways toward multiparameter, vector, distributed, and environmentally ...
Koustav Dey, Rex E. Gerald, Chen Zhu, Jie Huang   +3 more
wiley   +1 more source

Demonstration of Eight-Sensor Sagnac Fiber-Optic Hydrophone Array with Alternative Quadrature Phase Bias and Response Equalization Demodulation Algorithm

Photonics
The Sagnac interferometer-based fiber-optic hydrophone (S-FOH) exhibits a frequency-dependent response, causing the output signal to deviate from the original acoustic signal, with severe cases leading to signal distortion.
Delong Zhao, Ke Wang, Shuolin Yang, Wenjie Xie, Yuzhong Chen, Jie Yang, Zhangqi Song, Zhaohua Sun   +7 more
doaj   +1 more source

Self‐calibrated B1+ and B0 Field Inhomogeneities Estimation (SAFE) in 3D Magnetic Resonance Fingerprinting

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose To develop SAFE, a self‐calibrated framework to estimate B1+ and B0 field inhomogeneities directly from conventional magnetic resonance fingerprinting (MRF) acquisitions and improve its quantification accuracy. Methods SAFE utilized a two‐step approach. First, two physics‐informed image markers are extracted from the MRF data to create
Mengze Gao, Xiaozhi Cao, Daniel Raz Abraham, Zihan Zhou, Nan Wang, Congyu Liao, Yang Yang, Hanlin Sun, Hongwei Li, Yan Bai, Yu Shen, Yaping Wu, Meiyun Wang, Kawin Setsompop   +13 more
wiley   +1 more source

Differential-Phase Radar with Amplitude-Compensated Complex Signal Demodulation for Vital Sign Detection

, 2019
A differential-phase radar with amplitude-compensated complex signal demodulation (ACCSD) is presented., which can detect vital-signals from one-side of the human body even during back-and-forth random movements.
Han, Kawon, Songcheol Hong, Kawon Han, Hong, Songcheol   +3 more
core   +1 more source

1D Pre‐Acquisition Navigator Correcting Respiratory‐Induced Field Fluctuations in Multi‐Echo Gradient‐Echo Imaging of the Thoracic Spinal Cord

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose In the spinal cord (SC), multi‐echo gradient echo (ME‐GRE) increases gray (GM) and white matter (WM) contrast and improves sensitivity to lesions in people with multiple sclerosis (pwMS). However, SC ME‐GRE is susceptible to breathing‐induced field fluctuations, causing ghosting artifacts and signal loss.
Alicia E. Cronin, Alexandre D'Astous, Nathan Williams, Antoine Guénette, Aimee Salakhov, Seth Stubblefield, Colin D. McKnight, Lipika Narisetti, Subramaniam Sriram, Seth A. Smith, Ryan K. Robison, Guillaume Gilbert, Julien Cohen‐Adad, Kristin P. O'Grady   +13 more
wiley   +1 more source

Iterative Stochastic Resonance Demodulation Algorithm of Frequency-Hopping Signal

, 2019
: In order to improve the demodulation performance of frequency-hopping signals, this paper proposes a digital receiving algorithm based on the bistable stochastic resonance.
Baili, Zhang, Tian, Zhumei, Yang, Yuhua, Ren, Yongfeng, Li, Haixia   +4 more
core   +1 more source

Application of Self-Adaptive Wavelet Ridge Demodulation Method Based on LCD to Incipient Fault Diagnosis

Shock and Vibration, 2015
When a local defect occurs in gearbox, the vibration signals present as the form of multicomponent amplitude modulation and frequency modulation (AM-FM). Demodulation analysis is an effective way for this kind of signal.
Songrong Luo, Junsheng Cheng, Jianping Fu   +2 more
doaj   +1 more source