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Displaying 2551 - 2575 of 2717

Metrology with the Ultraviolet Scanning Transmission Microscope

May 1, 1995
Author(s)
Richard M. Silver, James E. Potzick, Y Hu
A novel design for an ultraviolet critical dimension measurement transmission microscope utilizing the Stewart platform as the rigid main structure has been implemented. This new design shows improved vibration characteristics and is able to accommodate

Overlay Measurements and Standards

May 1, 1995
Author(s)
Richard M. Silver, James E. Potzick, Robert D. Larrabee
The relative misalignment of features produced by different mask levels (i.e., overlay error) is projected to become an increasingly important problem to the semiconductor industry as the size of the critical features continues to decrease. In response to

Re-Evaluation of the Accuracy of NIST Photomask Linewidth Standards

May 1, 1995
Author(s)
James E. Potzick
Every artifact measurement standard has some uncertainty associated with its calibration, and the NIST Photomask Linewidth Standards are no exception. This uncertainty is caused by a combination of those factors which influence the calibration measurement

Interim testing artifact (ITA) : a performance evaluation system for coordinate measuring machines (CMMs) : user manual

February 1, 1995
Author(s)
Amy Singer, J Land, Steven D. Phillips, Daniel S. Sawyer, Bruce R. Borchardt, Gregory W. Caskey, D Ward, P Snoots, B Faust
The Interim Testing Artifact (ITA) is designed to quickly test CMMs for performance problems so that they can be repaired before significant numbers of good parts are erroneously rejected (or bad parts accepted) by the CMM. Frequent testing using the ITA

Microform Calibrations in Surface Metrology

February 1, 1995
Author(s)
Jun-Feng Song, F Rudder, Theodore V. Vorburger, A Hartman, Brian R. Scace, J Smith
Microform calibrations include the measurement of complex profile forms and position errors of micrometer scale in combination with the measurement of deviations from a specified profile and surface texture of profile segments. Tolerances on the profile

The Estimation of Measurement Uncertainty of Small Circular Features Measured by CMMs

February 1, 1995
Author(s)
Steven D. Phillips, Bruce R. Borchardt, William T. Estler
This paper examines the measurement uncertainty of small circular features as a function of the sampling strategy, i.e., the number and distribution of measurement points. Specifically, we examine measuring a circular feature using a three-point sampling

A Metrology Approach to Unifying Rockwell C Hardness Scales

January 1, 1995
Author(s)
Jun-Feng Song, J Smith, Theodore V. Vorburger
Current Rockwell C hardness scales (HRC) are unified by performance comparisons. Unless a reliable metrology approach is used for the direct verification of standard hardness machines and diamond indenters, the unified hardness scale may exhibit a

Automated Calibration of Scanning Probe Microscopy by Image Processing

January 1, 1995
Author(s)
J Jorgensen
The continuing drive within high technology industries to push dimensional tolerances to still smaller values motivates the use of surface measuring techniques with better resolution. This requirement can be met by the scanning probe microscopy (SPM)

Calibration Uncertainties for Microform of Rockwell Hardness Indenters

January 1, 1995
Author(s)
F Rudder, Jun-Feng Song
A microform calibration procedure has been developed at NIST to certify geometric conformity of Rockwell C hardness indenters. The interest in microform calibrations is to unify national and international comparisons of hardness tests. Using accepted

Computer Modeling of Heterodyne Interferometer Errors

January 1, 1995
Author(s)
Lowell P. Howard, Jack A. Stone Jr.
A computer model and methodology for modeling optical mixing errors in heterodyne interferometers is presented. The model is based on the Jones calculus and uses a matrix formalism to eliminate simplifications and reduce assumptions in the model. The model

Enhanced Machinability of Silicon Carbide via Microstructural Design

January 1, 1995
Author(s)
Nitin P. Padture, Christopher J. Evans, Hockin D. Xu, Brian R. Lawn
The machinability of a heterogeneous silicon carbide with weak interphase boundaries, elongated grains, and high internal stresses is evaluated relative to a homogeneous control material with a well-bonded, equiaxed, and unstressed grain structure

Error Compensation for CMM Touch Trigger Probes

January 1, 1995
Author(s)
William T. Estler, Steven D. Phillips, Bruce R. Borchardt, Ted Hopp, Christoph J. Witzgall, M Levenson, et al
We present the analysis of a simple mechanical model of a common type of kinematic seat touch trigger probe widely used on modem coordinate measuring machines (CMMs). The model provides a quantitative description of the pre-travel variation or probe lobing
Displaying 2551 - 2575 of 2717
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