WIT Press


NPL Optical Length Scales In The Range 300 Nm To 400mm

Price

Free (open access)

Paper DOI

10.2495/LAMDAMAP970171

Volume

16

Pages

10

Published

1997

Size

918 kb

Author(s)

M.B. McCarthy, J.W. Nunn and G.N. Rodger

Abstract

The National Physical Laboratory (NPL) has a long tradition in the calibration of optical length standards, a service which continues today in the form of line scales, graticules and stage micrometers. Recently it has improved the specifications of its affordable range of optical scales which include high specification standards for linewidth, two -dimensions and image analysers. This paper describes these standards, a recently launched range of quartz *NPL High Precision Line Scales' together with the apparatus used to calibrate them. The scales serve to verify the calibration of customers' optical measuring systems and they are regularly supplied to a broad range of companies and institutes world wide. 1 Introduction Recent rapid developments in micro-engineering, particularly associat

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