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Displaying records 11 to 20 of 22 records.
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11. Matrix-based color measurement corrections of tristimulus colorimeters
Topic: Optical Technology
Published: 4/20/2012
Authors: George P Eppeldauer, Z. T. Kosztyan, J. D. Schanda
Abstract: For image taking colorimetry the tristimulus technique is still the best practical method to keep the measurement time within reasonable limits. However, the achievable color measurement uncertainties for special sources can be significant because of ...

12. Metrology for Lab-on-a-Chip Final-Product Devices
Topic: Optical Technology
Published: 5/12/2013
Authors: Darwin R Reyes-Hernandez, Michael W Halter, Jeeseong Hwang
Abstract: New metrology tools to measure the critical parameters of internal structures in lab on a chip devices are greatly needed in order to develop standard tests for this technology. Here we present a method that combines a custom made optical coherence ...

13. On-Chip Silicon Waveguide Bragg Grating Photonic Temperature Sensor
Topic: Optical Technology
Published: 8/4/2015
Authors: Nikolai Nikolayevich Klimov, Sunil Mittal, Zeeshan Ahmed, Michaela Berger
Abstract: Resistance thermometry is a time-tested method for temperature measurements. Fundamental limits to resistance-based approaches, spurred our interest in developing photonic temperature sensors as a viable alternative. In this study we demonstrate that ...

14. Performance of the NIST goniometer with a broad-band source and multichannel CCD based spectrometer
Topic: Optical Technology
Published: 9/20/2012
Authors: Vyacheslav B Podobedov, Maria E Nadal, Carl C Miller

15. Quantitative scheme for full-field polarization rotating fluorescence microscopy (PROM) using a liquid crystal variable retarder
Topic: Optical Technology
Published: 5/14/2015
Authors: John F. Lesoine, Ji Y. Lee, Hyeong Gon (Hyeonggon) Kang, Matthew Lawrence Clarke, Robert C. Chang, Ralph Nossal, Jeeseong Hwang
Abstract: We introduce real-time, full-field, polarization rotating fluorescence microscopy (PROM) to monitor the absorption dipole orientations of fluorescent molecules. A quarter-wave plate, in combination with a liquid crystal variable retarder (LCVR ...

16. Random testing reveals excessive power in commercial laser pointers
Topic: Optical Technology
Published: 5/1/2013
Authors: Joshua Aram Hadler, Edna L Tobares, Marla L Dowell
Abstract: In random testing of 122 commercial laser pointers, we observed that 89.7 % of green pointers and 44.4 % of red pointers were not in compliance with the Code of Federal Regulations, producing laser power in excess of the Accessible Emission Limit at ...

17. Reference Ballistic Chronograph
Topic: Optical Technology
Published: 4/30/2009
Authors: Nicholas G Paulter Jr., Donald R Larson
Abstract: A ballistic chronograph with a measurement uncertainty of less than +/- 0.1 m/s has been designed, constructed and tested. Because of this low uncertainty, this chronograph can be used as a reference to calibrate and/or characterize the performance o ...

18. Spectral responsivity based calibration of photometer and colorimeter standards
Topic: Optical Technology
Published: 6/19/2013
Author: George P Eppeldauer
Abstract: Several new generation transfer- and working-standard illuminance meters and tristimulus colorimeters have been developed at the National Institute of Standards and Technology (NIST) to measure all kinds of light sources with low uncertainty. The spe ...

19. Standardization of Broadband UV Measurements
Topic: Optical Technology
Published: 1/1/2013
Author: George P Eppeldauer
Abstract: The CIE standardized rectangular-shape UV response functions can be realized only with large spectral mismatch errors. The spectral power-distribution of UV sources is not standardized. Accordingly, the readings of different types of UV meters, even ...

20. Standoff passive video imaging at 350 GHz with 251 superconducting detectors
Topic: Optical Technology
Published: 6/20/2014
Authors: Daniel Thomas Becker, James A Beall, Hsiao-Mei Cho, Gene C Hilton, Nicholas G Paulter Jr., Carl D Reintsema, Robert E Schwall, Cale Gentry, Ilya Smirnov, Peter Ade, W D Duncan, Mark Halpern, Carole Tucker
Abstract: Millimeter wavelength radiation holds promise for detection of security threats at a distance, including suicide bomb belts and maritime threats in poor weather. The high sensitivity of superconducting Transition Edge Sensor (TES) detectors makes the ...

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