Wideband quad optical sensor for high-speed sub-nanometer interferometry

2017 ◽  
Vol 56 (3) ◽  
pp. 397 ◽  
Author(s):  
L. M. Riobo ◽  
F. E. Veiras ◽  
P. A. Sorichetti ◽  
M. T. Garea
Keyword(s):  
Optical Sensor ◽  
High Speed

Modeling of Characteristics of Magneto-Optical Sensor Using FEM and Dipole Model for Nondestructive Evaluation

2005 ◽  
Vol 297-300 ◽  
pp. 2022-2027 ◽  
Author(s):  
Jin Yi Lee ◽  
Ji Seoung Hwang ◽  
Tetsuo Shoji ◽  
Jae Kyoo Lim
Keyword(s):  
Optical Sensor ◽  
High Speed ◽  
Crack Depth ◽  
Image Data ◽  
Nondestructive Inspection ◽  
Dipole Model ◽  
Inspection System ◽  
Optical Intensity ◽  
The Finite Element Method ◽  
Reflected Light

The magneto-optical nondestructive inspection system (hereafter refer to as RMO system) using magneto-optical sensor (hereafter refer to as MO sensor) offers the benefits of providing image data and LMF information at the same time. Therefore this system makes it possible to carry out remote and high speed inspection of cracks from the intensity of the reflected light and to estimate the shape of a crack more effectively than by already existing methods. In other words, the shape of crack could be evaluated using image data, and crack depth can be determined by calculating the intensity of reflected light. The purposes of this study were to confirm the vertical components of leakage magnetic flux from a crack using RMO system and to verify the effects of MO sensor using the finite element method and dipole model calculation. The effectiveness of these analysis methods was compared with experiments using a RMO system and several types and sizes of the crack on plate specimens. The volume of a crack could be estimated using the optical intensity regardless of the shape of cracks.

High-speed wafer film measurement with heterogeneous optical sensor system

2021 ◽  
Author(s):  
Doo-Hyun Cho ◽  
Seung Beom Park ◽  
Sung-Ha Kim ◽  
Taejoong Kim ◽  
Kwangsung Lee
Keyword(s):  
Optical Sensor ◽  
High Speed ◽  
Sensor System

High-Speed, High Dynamic-Range Optical Sensor Arrays

2009 ◽  
Vol 56 (3) ◽  
pp. 1069-1075 ◽  
Author(s):  
Stuart Kleinfelder ◽  
Shiuh-Hua Wood Chiang ◽  
Wei Huang ◽  
Ashish Shah ◽  
Kris Kwiatkowski
Keyword(s):  
Optical Sensor ◽  
High Speed ◽  
Dynamic Range ◽  
Sensor Arrays ◽  
High Dynamic Range ◽  
High Dynamic

scholarly journals Development of an optical swirl sensor for DI-diesel engines

2009 ◽  
Vol 137 (2) ◽  
pp. 37-49
Author(s):  
Robin VANHAELST ◽  
Werner HENTSCHEL ◽  
Christian MÜLLER ◽  
Jakub CZAJKA
Keyword(s):  
Diesel Engine ◽  
Optical Sensor ◽  
High Speed ◽  
Swirling Flow ◽  
Combustion Process ◽  
Optical Probe ◽  
Swirl Ratio ◽  
Acceptance Angle ◽  
Di Diesel Engine ◽  
Dimensional Simulation

In this paper the systematic development of an optical swirl sensor to measure the swirl ratio in an operating serial turbocharged DI-diesel engine is described. The optical sensor detects the visible light of the combustion, in particular the emission of the sooting flame in a wavelength range from 600 nm up to 1000 nm. The acceptance angle is so small that the soot clouds from every spray can be detected as they are being turned under the optical sensor by the swirling flow. In a first part the new optical probe method was validated on a transparent engine by comparison with high speed video recordings. In the second part several hardware variations were made on a serial DI-diesel engine which was equipped with a variable swirl valve. The influence of the opened- and closed swirl valve constellation and the piston geometry on the swirl ratio was measured with the optical probe technique. The results were compared with a zero dimensional simulation model. There was a good agreement between the swirl measurements and the 0D-model. The optical swirl sensor has proven to be a powerful tool to optimise the combustion process. Without any modifications on the cylinder head, the effect of application parameters and hardware parts on the swirl strength can be quantified for all engine loads and speeds.

scholarly journals Survivable Deployments of Optical Sensor Networks against Multiple Failures and Disasters: A Survey

Sensors ◽  
2019 ◽  
Vol 19 (21) ◽  
pp. 4790 ◽  
Author(s):  
Yongjun Zhang ◽  
Jingjie Xin
Keyword(s):  
Sensor Networks ◽  
Optical Communication ◽  
Optical Sensor ◽  
Data Transmission ◽  
High Speed ◽  
Optical Sensing ◽  
Self Healing ◽  
Multiple Failures ◽  
Sensing Data ◽  
Potential Development

Optical sensing that integrates communication and sensing functions is playing a more and more important role in both military and civil applications. Incorporating optical sensing and optical communication, optical sensor networks (OSNs) that undertake the task of high-speed and large-capacity applications and sensing data transmissions have become an important communication infrastructure. However, multiple failures and disasters in OSNs can cause serious sensing provisioning problems. To ensure uninterrupted sensing data transmission, survivability has always been an important research emphasis. This paper focuses on the survivable deployment of OSNs against multiple failures and disasters. We first review and evaluate the existing survivability technologies developed for or applied to OSNs, such as fiber bus protection, self-healing architecture, and 1 + 1 protection. We then elaborate on the disaster-resilient survivability requirement of OSNs. Moreover, we propose a new k-node (edge) sensing connectivity concept, which ensures the connectivity between sensing data and users. Based on k-node (edge) sensing connectivity, the disaster-resilient survivability technologies are developed. The key technologies necessary to implement k-node (edge) sensing connectivity are also elaborated. Recently, artificial intelligence (AI) has developed rapidly. It can be used to improve the survivability of OSNs. This paper details potential development directions of survivability technologies of optical sensing in OSNs employing AI.

High-speed 3D surface measurement with a fringe projection based optical sensor

2014 ◽  
Author(s):  
Christian Bräuer-Burchardt ◽  
Stefan Heist ◽  
Peter Kühmstedt ◽  
Gunther Notni
Keyword(s):  
Optical Sensor ◽  
High Speed ◽  
Fringe Projection ◽  
Surface Measurement ◽  
3D Surface

scholarly journals Development of an optical swirl sensor for DI-diesel engines

2010 ◽  
Vol 143 (4) ◽  
pp. 45-59
Author(s):  
Robin VANHAELST ◽  
Jakub CZAJKA
Keyword(s):  
Diesel Engine ◽  
Optical Sensor ◽  
High Speed ◽  
Swirling Flow ◽  
Combustion Process ◽  
Optical Probe ◽  
Swirl Ratio ◽  
Acceptance Angle ◽  
Di Diesel Engine ◽  
Dimensional Simulation

In this paper the systematic development of an optical swirl sensor to measure the swirl ratio in an operating serial turbocharged DI-diesel engine is described. The optical sensor detects the visible light of the combustion, in particular the emission of the sooting flame in a wavelength range from 600 nm up to 1000 nm. The acceptance angle is so small that the soot clouds from every spray can be detected as they are beeing turned under the optical sensor by the swirling flow. In a first part the new optical probe method was validated on a transparent engine by comparison with high speed video recordings. In the second part several hardware variations were made on a serial DI-diesel engine which was equipped with a variable swirl valve. The influence of the opened- and closed swirl valve constellation, the piston geometry and the injector influence on the swirl ratio was measured with the optical probe technique. The results were compared with a zero dimensional simulation model. There was a good agreement between the swirl measurements and the 0D-model. The optical swirl sensor has proven to be a powerful tool to optimise the combustion process. Without any modifications on the cylinder head, the effect of application parameters and hardware parts on the swirl strength can be quantified for all engine loads and speeds.

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