Surfaces and their Measurements
This book is primarily intended to help designers and inspectors to understand the fundamentals of surface metrology and, where appropriate, point to relevant procedures for specification.
TABLE OF CONTENTS Surfaces and their Measurements
Glossary
- 2CR network
- Analogue high pass filter used in early days to block waviness and form signals and thereby allow roughness to be measured.
- A/D converter
- Electronic device to convert an analogue signal to a digital one.
- AA
- Arithmetic average roughness. Used as roughness measure in USA - equivalent to R a and CLA.
- Abb error
- Misalignment between the sensitive direction of the metrology instrument and the dimension of the workpiece being measured.
- Abbott-Firestone curve
- Material ratio curve. Sometimes also called bearing ratio curve.
- Abrasive machining
- Machining that uses multiple random grains as the cutting tools.
- Abusive machining
- Machining of such severity as to cause subsurface stresses, usually tensile, and subsurface damage.
- ACF
- Autocorrelation function.
- Adhesion
- Force of attraction at sub-nanometre distances between bodies caused by atomic and molecular forces.
- AFM
- Atomic force microscope. Measures atomic forces.
- Aliasing
- Ambiguity introduced into digital signal due to infrequent sampling, which causes a folding over of the spectrum in the frequency domain.
- Ambiguity function
- A space frequency function based on the Fourier kernel. Achieves, in effect, a two-dimensional correlation.
- Amplitude discrimination
- A way of rejecting small peaks by imposing a minimum height restriction.
- Analytic signal
- A signal that only has positive frequencies. Achieved by use of the Hubert transform.
- Angular distortion
- Distortion of angles in roundness by measuring through apparent centre of part.
- Angular motion
- Angular component of error motion.
- Anisotropy
- Degree to which a surface has lay. Deviation from isotropy.
- APDF
- Amplitude probability density function.
- Areal
- Two-dimensional measurement of...
Surface Metrology [B5]
Copyright Taylor Hobson Ltd. 2002 under license agreement with Books24x7
