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You searched on: Author: patrick egan Sorted by: date

Displaying records 1 to 10 of 15 records.
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1. Laser Refractometer as a Transfer Standard of the Pascal
Published: 7/10/2016
Authors: Patrick F Egan, Jack A Stone Jr., Jacob E Ricker, Jay H Hendricks
Abstract: We have developed a new low pressure sensor which is based on the measurement of (nitrogen) gas refractivity inside a Fabry-Perot (FP) cavity. We compare pressure determinations via this laser refractometer to that of well-established ultrasonic mano ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=920182

2. Comparison measurements of low-pressure between a laser refractometer and ultrasonic manometer
Published: 5/13/2016
Authors: Patrick F Egan, Jack A Stone Jr., Jacob E Ricker, Jay H Hendricks
Abstract: We have developed a new low-pressure sensor which is based on the measurement of (nitrogen) gas refractivity inside a Fabry-Perot (FP) cavity. We compare pressure determinations via this laser refractometer to that of well-established ultrasonic man ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=920466

3. MEASURING PRESSURE AND VACUUM WITH LIGHT: A NEW PHOTONIC, QUANTUM-BASED, PRESSURE STANDARD
Published: 9/3/2015
Authors: Jay H Hendricks, Jacob E Ricker, Jack A Stone Jr., Patrick F Egan, Gregory E Scace, Gregory F Strouse, Douglas A Olson, Donavon Gerty
Abstract: The future of pressure and vacuum measurement will rely on lasers and Fabry-Perot optical cavities, and will be based on fundamental physics of light interacting with a gas. Light interacts at the quantum level with matter such that light travels at ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918150

4. Performance of a dual Fabry-Perot cavity refractometer
Published: 8/18/2015
Authors: Patrick F Egan, Jack A Stone Jr., Jay H Hendricks, Jacob E Ricker, Gregory E Scace, Gregory F Strouse
Abstract: We have built and characterized a refractometer that utilizes two Fabry-Perot cavities formed on a dimensionally stable spacer. In the typical mode of operation, one cavity is held at vacuum and the other cavity is filled with nitrogen gas. The dif ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918403

5. Clearing the fog for best in the world air-wavelength
Published: 7/1/2015
Authors: Patrick F Egan, Jack A Stone Jr.
Abstract: Laser interferometry, the basis for modern length metrology, achieves very high accuracies as a consequence of the stable, well-known frequencies of laser sources. However, length measurements in air also require corrections based on precise knowledg ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918742

6. In Search of Better Pressure Standards
Published: 8/1/2014
Authors: Jay H Hendricks, Jacob E Ricker, Patrick F Egan, Gregory F Strouse
Abstract: Based on highly accurate optical interferometry and fundamental quantum calculations, researchers at the National Institute of Standards and Technology (NIST) in the US are developing an improved definition of the SI unit for pressure that will consi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916352

7. Metrology for comparison of displacements at the picometer level
Published: 7/31/2014
Authors: Jack A Stone Jr., Patrick F Egan, Jay H Hendricks, Gregory F Strouse, Douglas A Olson, Jacob E Ricker, Gregory E Scace, Donavon Gerty
Abstract: An apparatus capable of comparing displacements with picometer accuracy is currently being designed at NIST. In principle, we wish to compare one displacement in vacuum to a second, equal displacement in gas, in order to determine gas refractive inde ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914470

8. Picometer Metrology for Precise Measurement of Refractive Index, Pressure, and Temperature
Published: 12/18/2013
Authors: Jack A Stone Jr., Patrick F Egan, Donavon Gerty, Jay H Hendricks, Douglas A Olson, Jacob E Ricker, Gregory E Scace, Gregory F Strouse
Abstract: Fabry-Perot interferometers can be used for very precise measurement of the refractive index of gasses. This can enable increased accuracy of interferometer-based length measurement. In addition, because the refractive index of a gas depends on its ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914549

9. Picometer metrology for precise measurement of refractive index, pressure, and temperature
Published: 7/14/2013
Authors: Jack A Stone Jr., Patrick F Egan, Jay H Hendricks, Gregory F Strouse, Douglas A Olson, Jacob E Ricker, Gregory E Scace
Abstract: For several years we have been studying the use of Fabry-Perot interferometers for precise measurement of the refractive index of gasses, where the primary motivation has been to improve interferometer-based length measurement. Because the refractiv ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913914

10. Weak value thermostat with 0.2 mK precision
Published: 12/1/2012
Authors: Patrick F Egan, Jack A Stone Jr.
Abstract: A new laser-based thermostat sensitive to 0.2 mK at room temperature is reported. The method utilizes a fluid-filled prism and interferometric weak value amplification to sense nanoradian deviations of a laser beam: due to the high thermooptic coef ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912232



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