Single frequency thermal wave radar: A next-generation dynamic thermography for quantitative non-destructive imaging over wide modulation frequency ranges

2018 ◽  
Vol 89 (4) ◽  
pp. 044901 ◽  
Author(s):  
Alexander Melnikov ◽  
Liangjie Chen ◽  
Diego Ramirez Venegas ◽  
Koneswaran Sivagurunathan ◽  
Qiming Sun ◽  
...  
Keyword(s):  
Thermal Wave ◽  
Modulation Frequency ◽  
Single Frequency ◽  
Next Generation ◽  
Wave Radar ◽  
Non Destructive ◽  
Dynamic Thermography

Non-destructive thermal-wave-radar imaging of manufactured green powder metallurgy compact flaws (cracks)

2017 ◽  
Vol 86 ◽  
pp. 140-152 ◽  
Author(s):  
A. Melnikov ◽  
K. Sivagurunathan ◽  
X. Guo ◽  
J. Tolev ◽  
A. Mandelis ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Thermal Wave ◽  
Radar Imaging ◽  
Wave Radar ◽  
Non Destructive

Non-destructive measurements of large case depths in hardened steels using the thermal-wave radar

2012 ◽  
Vol 45 (1) ◽  
pp. 16-21 ◽  
Author(s):  
R. Velazquez-Hernandez ◽  
A. Melnikov ◽  
A. Mandelis ◽  
K. Sivagurunathan ◽  
M.E. Rodriguez-Garcia ◽  
...  
Keyword(s):  
Thermal Wave ◽  
Hardened Steels ◽  
Wave Radar ◽  
Non Destructive ◽  
Large Case

scholarly journals A Local Oscillator Phase Compensation Technique for Ultra-Wideband Stepped-Frequency Continuous Wave Radar Based on a Low-Cost Software-Defined Radio

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 780
Author(s):  
Kazunori Takahashi ◽  
Takashi Miwa
Keyword(s):  
Software Defined Radio ◽  
Initial Phase ◽  
Continuous Wave ◽  
Low Cost ◽  
Local Oscillator ◽  
The Other ◽  
Ultra Wideband ◽  
Single Frequency ◽  
Wave Radar ◽  
Stepped Frequency

The paper discusses a way to configure a stepped-frequency continuous wave (SFCW) radar using a low-cost software-defined radio (SDR). The most of high-end SDRs offer multiple transmitter (TX) and receiver (RX) channels, one of which can be used as the reference channel for compensating the initial phases of TX and RX local oscillator (LO) signals. It is same as how commercial vector network analyzers (VNAs) compensate for the LO initial phase. These SDRs can thus acquire phase-coherent in-phase and quadrature (I/Q) data without additional components and an SFCW radar can be easily configured. On the other hand, low-cost SDRs typically have only one transmitter and receiver. Therefore, the LO initial phase has to be compensated and the phases of the received I/Q signals have to be retrieved, preferably without employing an additional receiver and components to retain the system low-cost and simple. The present paper illustrates that the difference between the phases of TX and RX LO signals varies when the LO frequency is changed because of the timing of the commencement of the mixing. The paper then proposes a technique to compensate for the LO initial phases using the internal RF loopback of the transceiver chip and to reconstruct a pulse, which requires two streaming: one for the device under test (DUT) channel and the other for the internal RF loopback channel. The effect of the LO initial phase and the proposed method for the compensation are demonstrated by experiments at a single frequency and sweeping frequency, respectively. The results show that the proposed method can compensate for the LO initial phases and ultra-wideband (UWB) pulses can be reconstructed correctly from the data sampled by a low-cost SDR.

NON-DESTRUCTIVE EVALUATION OF CONCRETE STRUCTURES BY NON-STATIONARY THERMAL WAVE IMAGING

2012 ◽  
Vol 32 ◽  
pp. 39-48 ◽  
Author(s):  
Ravibabu Mulaveesala ◽  
Soma Sekhara Balaji Panda ◽  
Rupla Naik Mude ◽  
Muniyappa Amarnath
Keyword(s):  
Thermal Wave ◽  
Concrete Structures ◽  
Non Destructive Evaluation ◽  
Wave Imaging ◽  
Non Destructive ◽  
Thermal Wave Imaging

Single-Frequency Fiber Amplifiers for Next-Generation Gravitational Wave Detectors

2018 ◽  
Vol 24 (3) ◽  
pp. 1-13 ◽  
Author(s):  
Michael Steinke ◽  
Henrik Tunnermann ◽  
Vincent Kuhn ◽  
Thomas Theeg ◽  
Malte Karow ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Fiber Amplifiers ◽  
Single Frequency ◽  
Next Generation ◽  
Gravitational Wave Detectors

Recent advances in thermal wave detection and ranging for non-destructive testing and evaluation of materials

2013 ◽  
Author(s):  
Ravibabu Mulaveesala ◽  
V. S. Ghali ◽  
Vanita Arora ◽  
Juned A. Siddiqui ◽  
Amarnath Muniyappa ◽  
...  
Keyword(s):  
Thermal Wave ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Wave Detection ◽  
Recent Advances ◽  
Non Destructive ◽  
Testing And Evaluation
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