Hanson, Steen Grüner

Jakobsen, Michael Linde

Larsen, Henning Engelbrecht

Olesen, Anders Sig

Pedersen, Henrik Chresten

Pedersen, T.F.

Stubager, Jørgen

As a part of the work carried out in a project supported by the Danish Council for Technology and Innovation, we have investigated the option of smoothing standard CNC-machined surfaces. In the process of constructing optical prototypes, involving custom-designed optics, the development cost and time consumption can become prohibitive in a research budget. Machining the optical surfaces directly is expensive and time consuming. Alternatively, a more standardized and cheaper machining method can be used, calling for the object to be manually polished. During the polishing process, the operator needs information about the RMS-value of the surface roughness and the current direction of the scratches introduced by the polishing process. The RMS-value indicates to the operator how far he is from the final finish, and the scratch orientation is often specified by the customer in order to avoid complications during the casting process. In this work we present a method for measuring the RMS-values of the surface roughness while simultaneously determining the polishing direction. We are mainly interested in the RMS-values in the range from 0 – 100 nm, which corresponds to the finish categories of A1, A2 and A3 (Finishing guide, Bales). Based on simple intensity measurements, we estimate the RMS-value of the surface roughness, and by using a sectioned annually shaped photo-detector to collect the scattered light, we can determine the direction of polishing and distinguish light scattered from random structures and light scattered from scratches

Online Research Database In Technology

Sensing roughness and polish direction - DTU Orbit (09/11/2017) Sensing roughness and polish directionAs a part of the work carried out in a project supported by the Danish Council for Technology and Innovation, we haveinvestigated the option of smoothing standard CNC-machined surfaces. In the process of constructing optical prototypes,involving custom-designed optics, the development cost and time consumption can become prohibitive in a researchbudget. Machining the optical surfaces directly is expensive and time consuming. Alternatively, a more standardized andcheaper machining method can be used, calling for the object to be manually polished. During the polishing process, theoperator needs information about the RMS-value of the surface roughness and the current direction of the scratchesintroduced by the polishing process. The RMS-value indicates to the operator how far he is from the final finish, and thescratch orientation is often specified by the customer in order to avoid complications during the casting process. In thiswork we present a method for measuring the RMS-values of the surface roughness while simultaneously determining thepolishing direction. We are mainly interested in the RMS-values in the range from 0 – 100 nm, which corresponds to thefinish categories of A1, A2 and A3 (Finishing guide, Bales). Based on simple intensity measurements, we estimate theRMS-value of the surface roughness, and by using a sectioned annually shaped photo-detector to collect the scatteredlight, we can determine the direction of polishing and distinguish light scattered from random structures and light scatteredfrom scratches.  General informationState: PublishedOrganisations: Department of Photonics Engineering, Optical Sensor Technology, Optical Microsensors andMicromaterials, FORCE TechnologyAuthors: Jakobsen, M. L. (Intern), Olesen, A. S. (Intern), Larsen, H. E. (Intern), Stubager, J. (Intern), Hanson, S. G.(Intern), Pedersen, T. (Ekstern), Pedersen, H. C. (Intern)Number of pages: 8Publication date: 2016 Host publication informationTitle of host publication: Proceedings of SPIEVolume: 9890Publisher: SPIE - International Society for Optical EngineeringArticle number: 98900SISBN (Print): 9781510601352Main Research Area: Technical/natural sciencesConference: Optical Micro- and Nanometrology VI, Brussels, Belgium, 03/04/2016 - 03/04/2016Scattering, Surface Roughness, Surface finishDOIs: 10.1117/12.2229440  Bibliographical notehttp://proceedings.spiedigitallibrary.org/volume.aspx?volumeid=17636Source: PublicationPreSubmissionSource-ID: 123604707Publication: Research - peer-review › Article in proceedings – Annual report year: 2016 

Sensing roughness and polish direction

M. L. Jakobsen

A. S. Olesen

H. E. Larsen

J. Stubager

S. G. Hanson

T. F. Pedersen

H. C. Pedersen

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Sensing roughness and polish direction

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