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Optics Letters, 1992 Self-focusing in conjunction with an intracavity aperture creates a power-dependent amplitude modulation in laser oscillators, which allows passive mode locking.
Christian Spielmann, T Brabec
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Velocity and depth contours with a mode-locked pulse
Applied Optics, 1976An expression is derived for the intensity in the reconstructed image of a three-dimensional object in motion. The particular cases of (1) a stationary three-dimensional object and (2) a moving object with exact path matching are treated separately. The displacement of the object during the exposure is assumed to be insignificant in comparison with the
S, Mallick, D, Malacara
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Defect depth quantification using lock-in thermography
Quantitative InfraRed Thermography Journal, 2015In this paper we explore the defect evaluation in austenitic stainless steel (SS) using Lock-in technique and the effect of modulation frequency on defect detectability. A review of international literature indicates that while such studies have been attempted on materials like Perspex and composites, studies on austenitic SS like AISI 316, which are ...
Sharath Delanthabettu +3 more
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Depth-gated imaging using lock-in holography
Journal of the Optical Society of America B, 2002Holographic depth-gated imaging is investigated with perpendicular-field multiple-quantum-well optically addressed spatial light modulators. It is shown that the signal-to-noise ratio of the image can be improved by use of the spatial light modulators in lock-in mode.
R. Mahon +5 more
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Lock-in thermography with depth resolution on silicon solar cells
Solar Energy Materials and Solar Cells, 2018Abstract Lock-in thermography (LIT) is the standard method for imaging and evaluating leakage currents in solar cells. For usually applied lock-in frequencies in the order of 10 Hz, silicon solar cells are considered to be thermally thin. Hence, depth-dependent investigations, as they are performed in non-destructive testing and failure analysis of ...
Breitenstein, O., Straube, H., Iwig, K.
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Reconciling seismicity and geodetic locking depths on the Anza section of the San Jacinto fault [PDF]
Geophysical Research Letters, 2016 AbstractObservations from the Anza section of the San Jacinto Fault in Southern California reveal that microseismicity extends to depths of 15–18 km, while the geodetically determined locking depth is less than ~10 km. This contrasts with observations from other major faults in the region and also with predictions of fault models assuming a simple ...
Yuri Fialko, Junle Jiang
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Lock-in thermography for evaluation of destruction area and determination of depth
SPIE Proceedings, 2007Infrared Thermography is a Nondestructive Testing and Evaluating (NDT&E) technique that allows the non-contact inspection of systems and materials through a mapping of thermal patterns on the surface of the objects of interest. Defect detection principle in active thermography is based on the fact that a difference of thermal properties exists between ...
Zijun Wang, Junyan Liu, Jingmin Dai
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Determining Subsurface Defects’ Depth in CFRP Composites Using Lock-In Thermography
2021The lock-in infrared thermography technique was used for inspecting a carbon fiber reinforced polymer (CFRP) sample to detect and to determine the depth of internal defects located underneath its top surface. The frequency dependency of incident modulated light on heat transport through the sample is explored to investigate its effect on the emitted ...
Carlos Manzano +3 more
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Modulation method for minimizing the depth distortion offset of lock-in TOF cameras
2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2013Registered depth and intensity data at a high frame rate, a compact design, low weight and a reduced power consumption have motivated the increasing usage of lock-in time-of-flight cameras in research areas such as computer graphics, machine vision and robotics.
Stephan Hussmann, Florian Johannes Knoll
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A sensor to monitor limb depth in transtibial sockets with locking pin suspension: a technical note
Prosthetics & Orthotics International, 2021Background: Monitoring of limb depth in transtibial sockets may provide useful information toward patient education and care. Objective: The objective was to develop a sensor to detect the depth of a locking pin in the shuttle lock of a transtibial socket and to monitor the small ...
Sam Bennett +5 more
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