In this work, the measurement noise of a point autofocus surface topography measuring instrument is evaluated, as the first step towards establishing a route to traceability for this type of instrument. The evaluation is based on the determination of the metrological characteristics for noise as outlined in draft ISO specification standards by using a calibrated optical flat. The static noise and repeatability of the autofocus sensor are evaluated. The influence of environmental disturbances on the measured surface topography and the built-in software to compensate for such influences are also investigated. The instrument was found to have a measurement noise of approximately 2 nm or, when expressed with the measurement bandwidth, 0.4 nm Hz−1 for a single-point measurement.
Noise evaluation of a point autofocus surface topography measuring instrument / Maculotti, Giacomo; Feng, Xiaobing; Galetto, Maurizio; Leach, Richard. - In: MEASUREMENT SCIENCE & TECHNOLOGY. - ISSN 0957-0233. - ELETTRONICO. - 29:6(2018), p. 065008. [10.1088/1361-6501/aab528]
|Titolo:||Noise evaluation of a point autofocus surface topography measuring instrument|
|Data di pubblicazione:||2018|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1088/1361-6501/aab528|
|Appare nelle tipologie:||1.1 Articolo in rivista|