Suche nach „[L.] [Smith]“ hat 27 Publikationen gefunden

F: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenF: Elektrotechnik und MedientechnikF: Maschinenbau und MechatronikI: Hochschulleitung und -einrichtungen

Vortrag

Markus Schinhärl, Elmar Pitschke, Rolf Rascher, Peter Sperber, R. Stamp, L. Smith, G. Smith

Temporal stability and performance of MR polishing fluid

Current Developments in Lens Design and Optical Engineering V, San Diego, CA, USA

2004

F: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenF: Elektrotechnik und MedientechnikF: Maschinenbau und MechatronikI: Hochschulleitung und -einrichtungen

Vortrag

Elmar Pitschke, Markus Schinhärl, Peter Sperber, Rolf Rascher, R. Stamp, L. Smith, M. Smith, A. Hammer

Comparison of a new contact topographical measurement system for spherical and aspherical surfaces with interferometry

Current Developments in Lens Design and Optical Engineering V, Denver, CO, USA

2004

F: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenF: Elektrotechnik und MedientechnikF: Maschinenbau und MechatronikI: Hochschulleitung und -einrichtungen

Zeitschriftenartikel

Markus Schinhärl, Elmar Pitschke, Rolf Rascher, Peter Sperber, R. Stamp, L. Smith, G. Smith

Temporal stability and performance of MR polishing fluid

Current Developments in Lens Design and Optical Engineering V, vol. 5523, pp. 273-280

2004

DOI: 10.1117/12.558897

Abstract anzeigen

The lifetime of standard magnetorheological (MR) polishing fluids, used for example in polishing machines for optical applications, is limited. Scanning electron microscope examinations as well as chemical analyses of the fluid had been undertaken in order to investigate reasons for limited lifetime. We found out that the removal rate decreases during the course of time. However, the usable fluid life is most limited by the point of time when the critical minimum amount of fluid, necessary to ensure circulation, is reached. The results in association with a new fluid conditioner show, that a standard MR polishing fluid may be used for longer periods than common periods of about 2 weeks.

F: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenF: Elektrotechnik und MedientechnikF: Maschinenbau und MechatronikI: Hochschulleitung und -einrichtungen

Zeitschriftenartikel

Elmar Pitschke, Markus Schinhärl, Peter Sperber, Rolf Rascher, R. Stamp, L. Smith, M. Smith, A. Hammer

Comparison of a new contact topographical measurement system for spherical and aspherical surfaces with interferometry

Current Developments in Lens Design and Optical Engineering V, vol. 5523, pp. 225-234

2004

DOI: 10.1117/12.558899

Abstract anzeigen

Since end of 2003 the TII-3D - the new contact topography measuring device for measuring aspherical and spherical surfaces - is available on market. Due to its novel technology, the system is specified to measure a large range with λ/10 accuracy, therefore being a very flexible tool for pre- and post-measurements in high quality zonal polishing processes like MRF. At the University of Applied Sciences Deggendorf a testing series has been carries out to compare the results of the TII-3D with CGH-interferometric measurements on aspherical surfaces. An analysis of the measurement errors is shown and ranking of the different metrology systems for production processes of high quality aspherical lenses is given.

F: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenF: Elektrotechnik und MedientechnikF: Maschinenbau und MechatronikI: Hochschulleitung und -einrichtungen

Vortrag

Elmar Pitschke, Peter Sperber, R. Stamp, Rolf Rascher, L. Smith, M. Smith, Markus Schinhärl

Prediction of MRF polishing by classification of the initial error with Zernike polynomials

Optical Manufacturing and Testing V, San Diego, CA, USA

2003

F: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenF: Elektrotechnik und MedientechnikF: Maschinenbau und MechatronikI: Hochschulleitung und -einrichtungen

Vortrag

Elmar Pitschke, Peter Sperber, Rolf Rascher, R. Stamp, M. Smith, L. Smith, Markus Schinhärl

Lens production enhancement by adoption of artificial influence functions and a knowledge-based system in a magnetorheological finishing process

Optical Manufacturing and Testing VII, San Diego, CA, USA

2003

F: Angewandte Naturwissenschaften und WirtschaftsingenieurwesenF: Elektrotechnik und MedientechnikF: Maschinenbau und MechatronikI: Hochschulleitung und -einrichtungen

Zeitschriftenartikel

Elmar Pitschke, Peter Sperber, R. Stamp, Rolf Rascher, L. Smith, M. Smith, Markus Schinhärl

Prediction of MRF polishing by classification of the initial error with Zernike polynomials

Optical Manufacturing and Testing V, vol. 5180, pp. 115-122

2003

DOI: 10.1117/12.507652

Abstract anzeigen

The magnetorheological finishing (MRF) process makes use of a magnetically stiffened magnetorheological abrasive fluid to polish the surface of a workpiece in a precise fashion. The process may be used to finish the surface of high quality optical lenses. Investigations have been undertaken to quantify the operation of MRF and to identify those parameters key to an optimal operation of this lens production process. A correlation has been developed to relate the parameters important to the removal characteristics and to the precision of the polishing result and to the duration of polishing. A relationship to indicate the most appropriate MRF processing parameters for a lens is presented. In the examples discussed Fringe-Zernike polynomials are used to quantify the error on a lens.