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Metrology

Optical/photometry/laser metrology

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Displaying 351 - 375 of 389

Optical Metrology for LEDs and Solid State Lighting

February 9, 2006
Author(s)
Yoshi Ohno
The performance of Light Emitting Diodes (LEDs), including efficiency, flux level, lifetime, and the variation of color, is advancing at a remarkable pace. LEDs are increasingly used for many applications including automotive, aviation, display

Terahertz Spectroscopy of Solid Serine and Cysteine

November 10, 2005
Author(s)
Timothy M. Korter, M B. Campbell, M C. Beard, Edwin J. Heilweil
Terahertz (THz) absorption spectra of the amino acids L-serine and L-cysteine in teh solid phase at 77K and 298 K are reported and compared to vibrational spectral results from Density Functional Theory for these species.

Effect of Dissolved Air on the Density and Refractive Index of Water

September 30, 2005
Author(s)
Allan H. Harvey, Simon G. Kaplan, John H. Burnett
We consider the effect of dissolved air on the density and the refractive index of liquid water from 0 ¿aC to 50 ¿aC. The density effect is calculated from the best available values of Henry's constants and partial molar volumes for the components of air

Luminance probes for contrast measurements in medical displays

May 1, 2003
Author(s)
Aldo Badano, Scott Pappada, Edward F. Kelley, Michael J. Flynn, Sandrine Martin, Jerzy Kanicki
We report on a comparative study that examines four conic luminance probes in their ability to measure small-spot display contrast. We performed linear scans of a slit using a computer-controlled stage. We found that, although the probes were assembled

Current Projects in Display Metrology at the NIST Flat Panel Display Laboratory

February 1, 2003
Author(s)
Paul A. Boynton, Edward F. Kelley, John M. Libert
The NIST Flat Panel Display Laboratory (FPDL) is operated through the Display Metrology Project (DMP) of the Electronic Information Technology Group in the Electricity Division of the Electronics and Electrical Engineering Laboratory of NIST. The DMP works

NIST Stray Light Elimination Tube Prototype

March 1, 2002
Author(s)
Paul A. Boynton, Edward F. Kelley
Electronic projection displays involve the projection of an image, usually through a lens system, onto a viewing screen. Metrics such as light output, contrast, non-uniformity, and color gamut are used to describe the resultant image quality. although

Comparison of Optical Coherence Tomography, X-Ray Computed Tomography, and Confocal Microscopy Results From an Impact Damaged Epoxy/E-Glass Composite

January 1, 2002
Author(s)
Joy Dunkers, D P. Sanders, Donald L. Hunston, M J. Everett, William H. Green
Optical coherence tomography (OCT) is an emerging technique for imaging of synthetic materials. OCT is attractive because of the combination of its high sensitivity (>90 dB), high resolution ((10-20) mm), and low cost ($75 k). The value of any new

The Prediction of Permeability for an Epoxy/E-Glass Composite Using Optical Coherence Tomographic Images

December 1, 2001
Author(s)
Joy Dunkers, Frederick R. Phelan Jr., C G. Zimba, Kathleen M. Flynn, D P. Sanders, R C. Peterson, Richard~undefined~undefined~undefined~undefined~undefined Parnas
Knowledge of the permeability tensor in liquid composite molding is important for process optimization. Unfortunately, experimental determination of permeability is difficult and time consuming. A rapid, non-destructive technique called optical coherence

Compensation for Stray Light in Projection Display Metrology

June 30, 2001
Author(s)
Paul A. Boynton, Edward F. Kelley
Electronic projection display specifications are often based on measurements made in ideal darkroom conditions and assume ideal measurement instrumentation. However, not everyone has access to such a facility, and not always will the light-measuring

Measurements of Static Noise in Display Images

January 1, 2001
Author(s)
John W. Roberts, Edward F. Kelley
The appearance of noise on a display is an important usability issue. Sources of noise include electrical interference, display driver artifacts, resampling artifacts, transmission artifacts, compression artifacts, and any intrinsic noise artifacts

The Application of Optical Coherence Tomography to Problems in Polymer Matrix Composites

January 1, 2001
Author(s)
Joy Dunkers, Frederick R. Phelan Jr., D P. Sanders, M J. Everett, William H. Green, Donald L. Hunston, Richard~undefined~undefined~undefined~undefined~undefined Parnas
The Composites Group at the National Institute of Standards and Technology has found optical coherence tomography (OCT) to be a powerful tool for non-destructive characterization of polymer matrix composites. Composites often exhibit superior properties to

An Assessment Standard for the Evaluation of Display Measurement Capabilities

November 1, 2000
Author(s)
John M. Libert, Paul A. Boynton, Edward F. Kelley, Steven W. Brown, Yoshi Ohno
A prototype display measurement assessment transfer standard (DMATS) is being developed by NIST to assist the display industry in standardizing measurement methods used to quantify the performance of electronic displays. Designed as an idealized electronic

Meeting the Metrology Needs of the Microdisplay Industry

August 31, 2000
Author(s)
Paul A. Boynton, Edward F. Kelley, John M. Libert
Measuring the optical characteristics of microdisplays produce challenges to traditional display metrology. When using light-measuring devices to measure scenes having high contrasts or wide color variations, they suffer the effects of veiling glare or

Mosquito Noise in MPEG-compressed Video: Test Patterns and Metrics

June 24, 2000
Author(s)
Charles D. Fenimore, John M. Libert, Peter Roitman
Mosquito noise is a time dependent video compression impairment in which the high frequency spatial detail in video images having crisp edges is aliased intermittently. A new synthetic test pattern of moving spirals or circles is described which generates

Imaging of Composite Defects and Damage Using Optical Coherence Tomography

May 1, 2000
Author(s)
Joy Dunkers, M J. Everett, D P. Sanders, Donald L. Hunston
The Composites Group at the National Institute of Standards and Technology has found optical coherence tomography (OCT) to be a powerful tool for non-destructive characterization of polymer matrix composites. Composites can be made more cost competitive by

Imaging of Impact Damage in Composites Using Optical Coherence Tomography

February 1, 2000
Author(s)
Joy Dunkers, D P. Sanders, Donald L. Hunston, M J. Everett
Resistance to impact damage is extremely important for most composites. Such damage can initiate delamination, one of the most common failure modes in composites.. Because this is such an important failure mode, many studies have tried to develop matrix

Diagnostics for Light Measuring Devices in Flying-spot Display Measurements

January 31, 2000
Author(s)
Paul A. Boynton, Edward F. Kelley, S. Highnote, R. Hurtado
Flying-spot displays, such as some laser projection displays, use a high-energy beam as a light source that scans the image across the display screen. Each pixel can be a narrow, high-energy pulse. When such displays are measured with convential light

Characterization of Composite Microstructure and Damage Using Optical Coherence Tomography

January 1, 1999
Author(s)
Joy Dunkers, C G. Zimba, Kathleen M. Flynn, Donald L. Hunston, R Prasankumar, X Li, J G. Fujimoto
Optical coherence tomography (OCT) is a non-destructive and non-contact technique that images microstructure within scattering media. In this work, the versatility of OCT for non-destructive evaluation is demonstrated through imaging of composite
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