The implementation of a high accuracy optical measurement technique of particular interest to miniature optics

1991 ◽  
Vol 4 (12) ◽  
pp. 524-527
Author(s):  
H. Ghafouri-Shiraz ◽  
Ian Vince Mcloughlin
Keyword(s):  
Measurement Technique ◽  
Optical Measurement ◽  
High Accuracy

A High Accuracy of Magnetometer by Using Independent Directional Magnetic Field Measurement Technique

2014 ◽  
Vol 565 ◽  
pp. 133-137
Author(s):  
Athirot Mano ◽  
Wisut Titiroongruang
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Flux Density ◽  
Measurement Technique ◽  
Field Measurement ◽  
High Accuracy ◽  
Two Dimensions ◽  
Magnetic Flux Density ◽  
Magnetic Field Measurement ◽  
Hall Sensors

In a measurement of magnetic flux density with high accuracy by using Hall effect sensor must be considered position of Hall sensor, that perfect perpendicular with magnetic flux line for measurement. Only one Hall element can cause measuring error. Therefore, this paper presents an application of independent directional magnetic field measurement technique on two dimensions for high accuracy magnetometer. It is presented by using two Hall sensors locate perpendicular to each other and use the relation of the two voltage output signal from both Hall sensors to calculate constant Hall voltage and Magnetic flux density with high accuracy by using trigonometric function with Lab-View programming. And as the result of experiment, this technique can reduce the limitation in term of this angle in the range magnetic flux density can be measured 0-1800 gauss. A calibration curve of this system compare with standard Gauss meter shows the coefficient of determination (R2) equal to 1 and has the accuracy percentage as less than 0.5%.

Timber screw connection: Study of the strain along the interface using optical measurement techniques and simulations

BioResources ◽  
2020 ◽  
Vol 15 (2) ◽  
pp. 3859-3873
Author(s):  
Cedou Kumpenza ◽  
Andreas Ringhofer ◽  
Thomas Krenke ◽  
Adeayo Sotayo ◽  
Maximilian Pramreiter ◽  
...  
Keyword(s):  
Measurement Technique ◽  
Optical Measurement ◽  
Speckle Pattern ◽  
Measurement Techniques ◽  
Axial Loading ◽  
Electronic Speckle Pattern Interferometry ◽  
Pull Out ◽  
Grain Orientations ◽  
Thread Length ◽  
D 12

In various engineering applications, self-tapping screws are used to connect timber members. To describe their load-deformation relationship, a better understanding of the strain along the mechanical interface (i.e., timber-screw interface) is required. With a focus on the axial loading of self-tapping screws, only a few studies have dealt with the determination of the strain based on optical measurement techniques. Therefore, in the present study, the strain distribution at the timber-screw interface was monitored during pull-out tests using an optical measurement technique, called electronic speckle pattern interferometry (ESPI). Strains obtained from the ESPI measurements were compared with the results obtained from structural simulations conducted with finite element modelling (FEM). Three different types of solid spruce wood (Picea abies (L.) Karst.) specimens with different grain orientations connected with self-tapping screws (thread length lg = 130 mm, outer thread diameter d = 12 mm) were tested in withdrawal. There was a good agreement between the ESPI and FEM results, confirming that ESPI was a suitable measurement technique. The study also provided insights and results regarding the region of strain concentrations across the length of self-tapping screws.

Variations in the Measured Carrier Lifetimes of n- 4H-SiC Epilayers

2008 ◽  
Vol 600-603 ◽  
pp. 489-492
Author(s):  
Paul B. Klein ◽  
Joshua D. Caldwell ◽  
Amitesh Shrivastava ◽  
Tangali S. Sudarshan
Keyword(s):  
Measurement Technique ◽  
Reasonable Agreement ◽  
Optical Measurement ◽  
Measurement Techniques ◽  
Carrier Dynamics ◽  
Injection Level ◽  
Carrier Lifetimes ◽  
Dynamics Simulations ◽  
Recombination Kinetics ◽  
Insight Into

The effects of measurement technique and measurement conditions (injection level, temperature) on the measured carrier lifetimes in n- 4H-SiC epilayers are investigated. For three optical measurement techniques, it is shown that the high and low injection lifetimes can vary dramatically. Differences in the lifetime for varying injection level and temperature are approached both experimentally and via carrier dynamics simulations, assuming Z1/Z2 as the dominant defect. Reasonable agreement between measured and calculated behavior is obtained, as is insight into the recombination kinetics associated with the lifetime limiting defect.

Raman microspectroscopy and multivariate data analysis: optical differentiation of aqueous d- and l-tryptophan solutions

2017 ◽  
Vol 19 (45) ◽  
pp. 30533-30539 ◽  
Author(s):  
H. Koch ◽  
S. Polepil ◽  
K. Eisen ◽  
S. Will
Keyword(s):  
Raman Spectroscopy ◽  
Data Analysis ◽  
Intermolecular Interactions ◽  
Measurement Technique ◽  
Multivariate Data Analysis ◽  
Optical Measurement ◽  
Multivariate Data ◽  
Raman Microspectroscopy

The combination of Raman spectroscopy as a sensitive and selective optical measurement technique and multivariate data analysis forms a powerful tool for probing intermolecular interactions between enantiomers.

Development of a novel optical measurement technique to investigate the hot cracking susceptibility during laser beam welding

2018 ◽  
Vol 63 (2) ◽  
pp. 435-441 ◽  
Author(s):  
N. Bakir ◽  
V. Pavlov ◽  
S. Zavjalov ◽  
S. Volvenko ◽  
A. Gumenyuk ◽  
...  
Keyword(s):  
Laser Beam ◽  
Measurement Technique ◽  
Optical Measurement ◽  
Laser Beam Welding ◽  
Hot Cracking
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