A PGC-DCDM demodulation scheme insensitive to phase modulation depth and carrier phase delay in an EOM-based SPM interferometer

2020 ◽  
Vol 474 ◽  
pp. 126183 ◽  
Author(s):  
Shihua Zhang ◽  
Yuanpeng Chen ◽  
Benyong Chen ◽  
Liping Yan ◽  
Jiandong Xie ◽  
...  
Keyword(s):  
Phase Modulation ◽  
Carrier Phase ◽  
Modulation Depth ◽  
Phase Delay

Observation of Large Photoacoustic Signal Phase Changes during a Diffusion Process

2005 ◽  
Vol 59 (11) ◽  
pp. 1420-1426
Author(s):  
Stanley J. Bajic ◽  
Roger W. Jones ◽  
John F. McClelland
Keyword(s):  
Phase Modulation ◽  
Heterogeneous Systems ◽  
Photoacoustic Signal ◽  
Phase Changes ◽  
Phase Delay ◽  
Homogeneous Sample ◽  
Heterogeneous Samples ◽  
Large Phase ◽  
Teflon Film

The phase of the photoacoustic signal is known to be a sensitive and accurate means to investigate, both qualitatively and quantitatively, static multilayer heterogeneous systems. According to theory, the maximum phase delay for a very weakly absorbing homogeneous sample should be within 45° of a very strongly absorbing sample, while for heterogeneous samples the phase delay can be greater than 45°. Here we report the observation of photoacoustic phase delays greater than 350° by extending the use of step-scan phase modulation photoacoustic spectroscopy to study a non-repetitive dynamic system in situ, in real time. These large phase delays correspond to sampling several thermal diffusion lengths into the sample. The model system used in this study consisted of a hydrocarbon grease diffusing through a porous Teflon film. The progress of the diffusion was tracked by monitoring both the photoacoustic signal magnitude and the phase of the hydrocarbon grease after isolation from the Teflon film signal contributions at two different phase modulation frequencies.

Direct and complete calibration of phase modulation depth of LCOS by using double exposure digital holography

2013 ◽  
Author(s):  
Spozmai Panezai ◽  
Dayong Wang ◽  
Jie Zhao ◽  
Yunxin Wang ◽  
Sijin Ma ◽  
...  
Keyword(s):  
Phase Modulation ◽  
Digital Holography ◽  
Modulation Depth ◽  
Double Exposure

scholarly journals Carrier phase delay altimetry with GPS-reflection/occultation interferometry from low Earth orbiters

2004 ◽  
Vol 31 (10) ◽  
pp. n/a-n/a ◽  
Author(s):  
E. Cardellach ◽  
C. O. Ao ◽  
M. de la Torre Juárez ◽  
G. A. Hajj
Keyword(s):  
Carrier Phase ◽  
Phase Delay

Extraction of Carrier Phase Delay for Nonlinear Errors Compensation of PGC Demodulation in an SPM Interferometer

2019 ◽  
Vol 37 (13) ◽  
pp. 3422-3430 ◽  
Author(s):  
Jiandong Xie ◽  
Liping Yan ◽  
Benyong Chen ◽  
Yingtian Lou
Keyword(s):  
Carrier Phase ◽  
Phase Delay ◽  
Nonlinear Errors

scholarly journals Correction of nonlinear errors from PGC carrier phase delay and AOIM in fiber-optic interferometers for nanoscale displacement measurement

2020 ◽  
Vol 28 (2) ◽  
pp. 2611
Author(s):  
Yisi Dong ◽  
Pengcheng Hu ◽  
Ming Ran ◽  
Haijin Fu ◽  
Hongxing Yang ◽  
...  
Keyword(s):  
Carrier Phase ◽  
Fiber Optic ◽  
Phase Delay ◽  
Displacement Measurement ◽  
Nonlinear Errors
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