Laser confocal microscope noise evaluation on injection compression moulded (ICM) transparent polymer Fresnel lenses

D. Loaldi, Matteo Calaon, Danilo Quagliotti, Federico Baruffi, P. Parenti, Guido Tosello, M. Annoni

Research output: Contribution to conferencePosterResearchpeer-review

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Abstract

The evaluation of an adequate and robust measuring strategy, for roughness assessment of polymer Fresnel lenses is put under assessment. An ‘on-sample’ measurement noise, is evaluated using a laser confocal microscope (OLYMPUS © Lext). Secondly, the lowest-noise roughness measuring procedure, on an injection compression moulded (ICM) Fresnel lens, is defined. A set of two different objectives is considered, i.e. a standard series (SO), against a long working distance one (LWD); two different magnifications objectives, 50x and 100x and the use or not of a dark environment. The noise evaluation is performed by comparing ‘on-sample’ noise with the one calculated on an optical flat. Noise is investigated by means of established methods, i.e. subtraction and averaging methods. Afterwards, the lowest-noise analysis is structured following a 23 full factorial experimental planning, whose factors are measuring working distance, objective magnification and room lighting. The result confirms a strong difference of noise, using the considered objectives. The most interesting result is that the performance of SO 50x objective is better than LWD 100x.
Original languageEnglish
Publication date2017
Number of pages1
Publication statusPublished - 2017
Eventeuspen’s 17th International Conference & Exhibition - Hannover Congress Centre, Hannover, Germany
Duration: 29 May 20172 Jun 2017

Conference

Conferenceeuspen’s 17th International Conference & Exhibition
LocationHannover Congress Centre
CountryGermany
CityHannover
Period29/05/201702/06/2017

Cite this

Loaldi, D., Calaon, M., Quagliotti, D., Baruffi, F., Parenti, P., Tosello, G., & Annoni, M. (2017). Laser confocal microscope noise evaluation on injection compression moulded (ICM) transparent polymer Fresnel lenses. Poster session presented at euspen’s 17th International Conference & Exhibition, Hannover, Germany.