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Metrology

Optical/photometry/laser metrology

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Displaying 276 - 300 of 389

Coupled-cavity ring-down spectroscopy technique

August 6, 2012
Author(s)
Jeremie B. Courtois, Joseph T. Hodges
We present a technique called coupled-cavity ring-down spectroscopy (CC-RDS) for controlling the finesse of an optical resonator. Applications include extending the sensitivity and dynamic range of a cavity-enhanced spectrometer, as well as widening the

A compact and robust method for full Stokes spectropolarimetry

August 1, 2012
Author(s)
William Sparks, Thomas Germer, John MacKenty, Frans Snik
We present an approach to spectropolarimetry which requires neither moving parts nor time dependent modulation, and which o ers the prospect of achieving high sensitivity. The concept, which is one of those generically known as channeled polarimetry, is to

Calibration of an Astrophysical Spectrograph below 1 m/s using a Laser Frequency Comb

June 4, 2012
Author(s)
David F. Phillips, Alexander G. Glenday, Chih-hao Li, Claire E. Cramer, Gabor Furesz, Guoquing Chang, Andrew Benedick, Li-Jin Chen, F X. Kaertner, Sylvain G. Korzennik, Dimitar Sasselov, Andrew Szentgyorgyi, Ronald L. Walsworth
We deployed two wavelength calibrators based on laser frequency combs ("astro-combs") at an astronomical observatory. One astro-comb operated over a 100 nm band in the deep red ( 800 nm) and a second operated over a 20 nm band in the blue ( 400 nm). We

Stray light correction algorithm for multi-spectral hyperspectral spectrographs

June 1, 2012
Author(s)
Michael Feinholz, Stephanie J. Flora, Steven W. Brown, Yuqin Zong, Keith R. Lykke, Mark A. Yarbrough, B. Carol Johnson, D. K. Clark
An algorithm is developed to correct a multi-channel fiber-coupled spectrograph for stray or scattered light within the system. The efficacy of the algorithm is evaluated based on a series of validation measurements of sources with different spectral

CfA4: 93 Type Ia Supernova Light Curves from the CfA

May 17, 2012
Author(s)
Malcolm Hicken, Peter Challis, Robert Kirshner, Claire E. Cramer, Armin Rest, W. M. Wood-Vasey, Gaspar Bakos, Perry Berlind, Warren R. Brown, Nelson Caldwell, Michael Calkins, Maria Contreras, Gil Esquerdo, Mark Everett, Emilio Falco, Ted Groner, Matthew J. Holman, Robert Hutchison, Michael Pahre, Wayne Peters, Benjamin Ripman, Timothy Spahr, Andrew Szentgyorgyi, Manuel A. Torres, Amali Vaz
We present multi-band photometry of 93 type-Ia supernovae (SN Ia). Data was acquired with the Keplercam instrument between 2006 and 2011 at the F. L. Whipple Observatory of the Harvard-Smithsonian Center for Astrophysics (CfA). Our natural system SN

The Pan-STARRS1 Photometric System

May 10, 2012
Author(s)
J. L. Tonry, Christopher W. Stubbs, Keith R. Lykke, Peter Doherty, I. S. Shivvers, W. S. Burgett, K. C. Chambers, K. W. Hodapp, N. Kaiser, R -. Kudritzki, E. A. Magnier, J. S. Morgan, P. A. Price, R. J. Wainscoat
The Pan-STARRS1 survey is collecting multi-epoch, multi-color observations of the sky north of declination −30 to unprecedented depths. These data are being photometrically and astrometrically calibrated and will serve as a reference for many other

PV-MCT working standard radiometer

April 23, 2012
Author(s)
George P. Eppeldauer, Vyacheslav B. Podobedov
Sensitive infrared working-standard detectors with large active area are needed to extend the signal dynamic range of the National Institute of Standards and Technology (NIST) pyroelectric transfer-standards used for infrared spectral power responsivity

Matrix-based color measurement corrections of tristimulus colorimeters

April 20, 2012
Author(s)
George P. Eppeldauer, Z. T. Kosztyan, J. D. Schanda
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 the

Comparison of laser-based and monochromator-based thermodynamic temperature measurements

March 19, 2012
Author(s)
George P. Eppeldauer, Howard Yoon, Jorge Neira Arango, Vladimir B. Khromchenko, Charles E. Gibson, Allan W. Smith
In this work, we describe the comparisons between the laser-based and monochromator-based radiance responsivity calibrations of a radiation thermometer. The spectral selection of the radiation thermometer is performed using a photopic-response filter which

An absolute cavity pyrgeometer to measure the absolute outdoor longwave irradiance with traceability to International System of Units, SI

March 1, 2012
Author(s)
Ibrahim Reda, Jinan Zeng, Jonathan Scheuch, Leonard Hanssen, Daryl Myers, Boris Wilthan, Tom Stoffel
This article describes a method of measuring the absolute outdoor longwave irradiance using an absolute cavity pyrgeometer (ACP). The ACP consists ofa domeless thermopile pyrgeometer, gold- plated concentrator, temperature controller, and data acquisition

Results from Solar Reflective Band End-to-End Testing for VIIRS F1 Sensor Using T-SIRCUS

October 24, 2011
Author(s)
Jeff McIntire, David Moyer, James K. McCarthy, Steven W. Brown, Keith R. Lykke, Frank De Luccia, Xiaoxiong Xiong, James J. Butler, Bruce Guenther
Verification of the Visible Infrared Imager Radiometer Suite (VIIRS) End-to-End (E2E) sensor calibration is highly recommended before launch, to identify any anomalies and to improve our understanding of the sensor on-orbit calibration performance. E2E

On the electronic excited state dynamics of vibronic transitions. High resolution electronic spectra of acenaphthene and its argon van der Waals complex in the gas phase.

September 1, 2011
Author(s)
Leonardo Avarez-Valtierra, David F. Plusquellic, John T. Yi, David W. Pratt
Rotationally resolved fluorescence excitation spectroscopy has been used to study the dynamics, electronic distribution, and the relative orientation of the transition moment vector in several vibronic transitions of acenaphthene (ACN) and in its Ar van

Single-Photon Sources and Detectors

July 27, 2011
Author(s)
M D. Eisaman, Jingyun Fan, Alan L. Migdall, Sergey Polyakov
We review the current status of single-photon-source and single-photon-detector technologies operating at wavelengths from the ultraviolet to the infrared. We discuss applications of these technologies to quantum communication, a field that is currently

Synchrotron radiation-based bilateral intercomparison of ultraviolet source calibrations

July 7, 2011
Author(s)
Uwe Arp, Zhigang Li, Ping-Shine Shaw, Mathias Richter, Roman Klein, Wolfgang Paustian, Reiner Thornagel
We report on a successful bilateral inter-comparison between the Physikalisch-Technische Bundesanstalt (PTB) and the National Institute of Standards and Technology (NIST). In both laboratories deuterium lamps were calibrated using the calculability of

Four-color laser white illuminant demonstrating high color-rendering quality

July 4, 2011
Author(s)
Alexander Neumann, Jonathan Wierer , Wendy L. Davis, Yoshi Ohno, Steve Brueck, Jeff Tsao
Solid-state lighting is currently based on light-emitting diodes (LEDs) and phosphors. Solid-state lighting based on lasers would offer significant advantages including high potential efficiencies at high current densities. Light emitted from lasers
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