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You searched on: Author: gregory scace

Displaying records 11 to 20 of 22 records.
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11. Design and Performance of the new NIST Hybrid Humidity Generator
Published: 8/1/2008
Authors: Christopher W Meyer, W Wyatt Miller, Dean C Ripple, Gregory E Scace
Abstract: A new humidity generator has been constructed at the National Institute of Standards and Technology. Once fully operational, the NIST Hybrid Humidity Generator (HHG) will replace the Two-Pressure (2-P) Humidity Generator Mark II as the NIST primary ...

12. Automated Continuous-Flow Gravimetric Hygrometer as a Primary Humidity Standard
Published: 5/1/2008
Authors: Christopher W Meyer, Joseph Terence Hodges, R W. Hyland, Gregory E Scace, J Valencia-Rodriguez, James R Whetstone
Abstract: A new primary gravimetric hygrometer has been completed at the National Institute of Standards and Technology (NIST). This apparatus determines the humidity in a steadily flowing gas stream by first separating the water from the carrier gas using de ...

13. A Reference Standard for Measuring Humidity of Air Using a Re-entrant Radio Frequency Resonator
Published: 5/2/2006
Authors: Peter H. Huang, Dean C Ripple, Michael R Moldover, Gregory E Scace
Abstract: We developed a stable reference hygrometer suitable for operation at temperatures above ambient that has a robust design, inherent stability, and a well-understood theory of measurement. This hygrometer uses a reentrant, radio-frequency, cavity reson ...

14. Developing advanced humidity standards to measure trace water vapor in specialty gases
Published: 1/1/2006
Authors: Joseph Terence Hodges, Gregory E Scace
Abstract: We describe primary thermodynamic standards for trace humidity generation maintained at NIST. Also, a discussion of NIST calibration services providing traceability of transfer standards to NIST primary standards is presented. Applications to the m ...

15. Frequency-Stabilized Single-Mode Cavity Ring-Down Apparatus for High-Resolution Absorption Spectroscopy
Published: 4/1/2004
Authors: Joseph Terence Hodges, Howard P. Layer, W Wyatt Miller, Gregory E Scace
Abstract: We present a new cavity ring-down spectroscopy (CRDS) apparatus suitable for high-resolution absorption spectroscopy. The central feature of the spectrometer is a ring-down cavity whose comb of eigenfrequencies is actively stabilized with respect to ...

16. Calibrating Water Permeation Tubes Using Saturator-Based Primary Trace Humidity Standards
Published: 5/1/2003
Authors: Gregory E Scace, Joseph Terence Hodges
Abstract: H^d2^O-containing permeation tubes are a key component of permeation tube humidity generators (PTGs). These devices are widely used for calibrating atmospheric pressure ionization mass spectrometers (APIMS) and for calibrating other trace humidity a ...

17. Referencing Dilution-Based Trace Humidity Generators to Primary Humidity Standards
Published: 6/1/2001
Authors: Peter H. Huang, Gregory E Scace, Joseph Terence Hodges
Abstract: We describe a technique for measuring the trace humidity level delivered by a permeationtube type moisture generator (PTMG). Amount fractions in the range 10 nmol/mol to 100 nmol/mol of H2O in N2 carrier gas were considered. The measurements are re ...

18. Uncertainty of the NIST Low Frost-Point Humidity Generator
Published: 6/1/2001
Authors: Gregory E Scace, Joseph Terence Hodges
Abstract: The NIST Low Frost-point Humidity Generator (LFPG) produces water vapor gas mixtures with mole fractions from approximately 5 nmol/mol to 4 mmol/mol for research, calibration of transfer standards, and testing and development of new humidity instrum ...

19. Wavelength-Modulation Laser Hygrometer for Ultrasensitive Detection of Water Vapor in Semiconductor Gases
Published: 2/1/2001
Authors: D C Hovde, Joseph Terence Hodges, Gregory E Scace, J A Silver
Abstract: The ability to quantify trace amounts of water vapor in semiconductor process gases is critical to quality control plasma etching and other semiconductorfabrication techniques. This paper demonstrates a first-principles method for the measurement of ...

20. Performance of a Precision Low Frost-Point Humidity Generator
Published: 2/12/1998
Authors: Gregory E Scace, D C Hovde, Joseph Terence Hodges, Peter H. Huang, J A Silver, James R Whetstone

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