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.
|Number of pages||1|
|Publication status||Published - 2017|
|Event||euspen’s 17th International Conference & Exhibition - Hannover Congress Centre, Hannover, Germany|
Duration: 29 May 2017 → 2 Jun 2017
|Conference||euspen’s 17th International Conference & Exhibition|
|Location||Hannover Congress Centre|
|Period||29/05/2017 → 02/06/2017|
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.