Results 251 to 260 of about 115,709 (298)

Injection-depth-locking axial motion guided handheld micro-injector using CP-SSOCT

2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2014
This paper presents a handheld micro-injector system using common-path swept source optical coherence tomography (CP-SSOCT) as a distal sensor with highly accurate injection-depth-locking. To achieve real-time, highly precise, and intuitive freehand control, the system used graphics processing unit (GPU) to process the oversampled OCT signal with high ...
Gyeong Woo, Cheon, Yong, Huang, Hye Rin, Kwag, Ki-Young, Kim, Russell H, Taylor, Peter L, Gehlbach, Jin U, Kang   +6 more
openaire   +2 more sources

Open crack depth sizing by laser stimulated infrared lock-in thermography

Journal of Physics D: Applied Physics, 2014
Recent advances in infrared imaging have made active thermography an interesting non destructive technique for sub-surface defect detection. Here, we present a method for the estimation of the depth of open surface defects by infrared lock-in thermography, based on the relation between the crack depth and the Laplacian of the surface temperature ...
Y Fedala, M Streza, J-P Roger, G Tessier, C Boué   +4 more
openaire   +1 more source

Ultrasound lock-in thermography for advanced depth resolved defect selective imaging

Insight - Non-Destructive Testing and Condition Monitoring, 2007
Ultrasound lock-in thermography ('attenuation mapping') is a defect selective 'dark field' NDT technique with a high probability of defect detection (PoD), since only defects produce a signal while other features are suppressed. The basic contrast mechanism is the enhanced local mechanical loss turning a variably loaded defect into a heat source.
A Gleiter, G Riegert, Th Zweschper, G Busse   +3 more
openaire   +1 more source

Defect Z-depth Determination in Flip-chip using lock-in thermography

2017 IEEE 24th International Symposium on the Physical and Failure Analysis of Integrated Circuits (IPFA), 2017
This paper describes the use of Lock-In Thermography (LIT) technique to determine the defect Z-depth in flip chip. An empirical phase shift versus applied lock-in frequency plot for Flip-chip is first created by using samples with known defect Z-depth.
Wen Qiu, Bemice Zee, Herve Deslandes, Brian Lai, David Tien   +4 more
openaire   +1 more source

Video Detection System Design of Meshing Depth of Elevator’s Door Lock

Advanced Materials Research, 2012
The detection of meshing depth of elevator’s door lock is an important content in the detections of elevator safety performance. Based on machine vision and the principle of image processing, this paper established a detection system of meshing depth of elevator’s door lock, and designed a handheld instrument.
Zhi Yuan LU, Bo Zhao, Tie Liu, Yun Peng Song, You Meng Zhang   +4 more
openaire   +1 more source

Performance analysis of locking methods with limited wait depth

Performance Evaluation, 1998
Abstract A number of recent studies have proposed lock conflict resolution methods to improve the performance of standard locking, i.e., the two-phase locking concurrency control method with the general waiting policy. The wait depth limited (WDL) method, which is an improvement on the running priority (RPS) method, outperforms other known ...
openaire   +1 more source

Lock-in thermography for evaluation of destruction area and determination of depth

SPIE Proceedings, 2007
Infrared 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
openaire   +1 more source

A sensor to monitor limb depth in transtibial sockets with locking pin suspension: a technical note

Prosthetics & Orthotics International, 2021
Background: 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, Clement Gurrey, Horace Wang, Mathew Weissinger, Brian Larsen, Joan E. Sanders   +5 more
openaire   +2 more sources

Photonic skin-depth engineering: universal spin-momentum locking of light (Conference Presentation)

High Contrast Metastructures VI, 2017
Here, we surpass the diffraction limit of light by a new class of all-dielectric artificial materials that are lossless. This overcomes one of the fundamental challenges of light confinement in metamaterials and plasmonics: metallic loss. Our approach relies on controlling the optical momentum of evanescent waves as opposed to conventional photonic ...
Saman Jahani, Zubin Jacob
openaire   +1 more source

A performance comparison of locking methods with limited wait depth

IEEE Transactions on Knowledge and Data Engineering, 1997
A number of recent studies have proposed lock conflict resolution methods to improve the performance of standard locking, i.e., strict two-phase locking with the general waiting method. This paper is primarily concerned with the performance of wait depth limited methods with respect to each other and some other methods.
openaire   +1 more source