Theoretical Analysis and Numerical Simulation of GFRP Specimens' Defects Detection Using Infrared Thermal Wave Testing Technology Based on Linear Frequency Modulation Excitation

2020 ◽  
Author(s):  
Tang Qingju ◽  
Wang Yunze
Keyword(s):  
Numerical Simulation ◽  
Theoretical Analysis ◽  
Frequency Modulation ◽  
Thermal Wave ◽  
Linear Frequency Modulation ◽  
Linear Frequency ◽  
Testing Technology ◽  
Modulation Excitation

scholarly journals Thermal barrier coating debonding defects detection based on infrared thermal wave testing technology under linear frequency modulation heat exitation

2019 ◽  
Vol 23 (3 Part A) ◽  
pp. 1607-1613
Author(s):  
Yuanlin Liu ◽  
Guojin Zhao ◽  
Yongzhi Du ◽  
Yang Zhang
Keyword(s):  
Light Source ◽  
Frequency Modulation ◽  
Thermal Wave ◽  
Signal To Noise Ratio ◽  
Linear Frequency Modulation ◽  
Thermal Barrier ◽  
Signal To Noise ◽  
Linear Frequency ◽  
Barrier Coating ◽  
Testing Technology

Thermal barrier coating debonding defects detection based on infrared thermal wave testing technology under linear frequency modulation heat excitation was studied. The principle the infrared thermal wave testing technology under linear frequency modulation was presented. The effects of different light source power and Chirp modulation frequency on signal-to-noise ratio were compared and analyzed. The results show that, defects can be more easily detected with the bigger power of light source, and the signal-to-noise ratio can be increased by using lower initial and termination frequencies.

Wideband dipole logging based on segment linear frequency modulation excitation

2018 ◽  
Vol 15 (2) ◽  
pp. 197-207
Author(s):  
Xue-Shen Cao ◽  
Hao Chen ◽  
Ping Li ◽  
Hong-Bin He ◽  
Yin-Qiu Zhou ◽  
...  
Keyword(s):  
Frequency Modulation ◽  
Linear Frequency Modulation ◽  
Linear Frequency ◽  
Modulation Excitation

scholarly journals Co-designed radar-communication using linear frequency modulation waveform

2016 ◽  
Author(s):  
Michael J. Nowak ◽  
Zhiping Zhang ◽  
Yang Qu ◽  
Dimitri A. Dessources ◽  
Michael Wicks ◽  
...  
Keyword(s):  
Frequency Modulation ◽  
Linear Frequency Modulation ◽  
Linear Frequency

scholarly journals Designing a waveform using LFM, NLFM for MIMO radar

2017 ◽  
Vol 7 (1.5) ◽  
pp. 84
Author(s):  
G S Krishnam Naidu Yedla ◽  
D. Siva Sankar Prasad ◽  
P. Raghavendra Rao ◽  
M Siva Kumar ◽  
M VenuGopala Rao
Keyword(s):  
Frequency Modulation ◽  
Frequency Component ◽  
Side Lobe ◽  
Mimo Radar ◽  
Linear Frequency Modulation ◽  
Wave Form ◽  
Boundary Segment ◽  
Middle Segment ◽  
Time Frequency ◽  
Linear Frequency

We propose a waveform that includes Linear frequency modulation and non linear frequency modulation wave applicable for MIMO radar. The wave form consists of three segments where the boundary segment consists of LFM content and the middle segment consists of NLFM. The time frequency component in the middle segment is controlled. The range and Doppler side lobe suppression is improved. The genetic algorithm is implemented to suppress the side lobes in the auto correlation and cross correlation functions. The performance is analysed by using ambiguity function.

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