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You searched for subject:(aspheric surface). Showing records 1 – 3 of 3 total matches.

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NSYSU

1. Liu, Yu-Zhong. A study on form error compensation method for aspheric surface polishing.

Degree: Master, Mechanical and Electro-Mechanical Engineering, 2009, NSYSU

A strategy was proposed to make machining rate stable and the machining precision achieved by properly tool dwelling time when surface still has form error after previously machining. Using computer simulation to plan tool dwelling time and to estimate practicability of this strategy. As a result of curvatures are different on the every points of the work piece surface. Normal vectors that between tool and work pieces surface are not stable in polishing process.HDP conditions and film thickness will be changed by curvature radius of work pieces.So HDP conditions must be controlled when the planning of tool motion. Analyzing all of different aspheric surfaces to make sure this strategy can be used. The different thing that between axially symmetric and axially non-symmetric is tool dwelling time should be a linear function the product of the depth function of profile and the radius for symmetric work pieces, but that of axially non-symmetric work pieces only should be linearly proportional to the depth function of profile. Advisors/Committee Members: Tu-Chich Hung (chair), KUANG-HUA FUH (chair), Yaw-Terng Su (committee member), Jung-Shu Wu (chair).

Subjects/Keywords: axially non-symmetric; curvature radius; aspheric surface

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APA (6th Edition):

Liu, Y. (2009). A study on form error compensation method for aspheric surface polishing. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0822109-113611

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Liu, Yu-Zhong. “A study on form error compensation method for aspheric surface polishing.” 2009. Thesis, NSYSU. Accessed January 19, 2020. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0822109-113611.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Liu, Yu-Zhong. “A study on form error compensation method for aspheric surface polishing.” 2009. Web. 19 Jan 2020.

Vancouver:

Liu Y. A study on form error compensation method for aspheric surface polishing. [Internet] [Thesis]. NSYSU; 2009. [cited 2020 Jan 19]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0822109-113611.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Liu Y. A study on form error compensation method for aspheric surface polishing. [Thesis]. NSYSU; 2009. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0822109-113611

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. MOHAMMAD SAZEDUR RAHMAN. Design and development of an on-machine profile measurement system for an ELID grinding machine.

Degree: 2007, National University of Singapore

Subjects/Keywords: ELID; On-Machine Measurement; aspheric surface; software compensation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

RAHMAN, M. S. (2007). Design and development of an on-machine profile measurement system for an ELID grinding machine. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/23085

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

RAHMAN, MOHAMMAD SAZEDUR. “Design and development of an on-machine profile measurement system for an ELID grinding machine.” 2007. Thesis, National University of Singapore. Accessed January 19, 2020. http://scholarbank.nus.edu.sg/handle/10635/23085.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

RAHMAN, MOHAMMAD SAZEDUR. “Design and development of an on-machine profile measurement system for an ELID grinding machine.” 2007. Web. 19 Jan 2020.

Vancouver:

RAHMAN MS. Design and development of an on-machine profile measurement system for an ELID grinding machine. [Internet] [Thesis]. National University of Singapore; 2007. [cited 2020 Jan 19]. Available from: http://scholarbank.nus.edu.sg/handle/10635/23085.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

RAHMAN MS. Design and development of an on-machine profile measurement system for an ELID grinding machine. [Thesis]. National University of Singapore; 2007. Available from: http://scholarbank.nus.edu.sg/handle/10635/23085

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of Arizona

3. Su, Peng. Absolute Measurements of Large Mirrors .

Degree: 2008, University of Arizona

The ability to produce mirrors for large astronomical telescopes is limited by the accuracy of the systems used to test the surfaces of such mirrors. Typically the mirror surfaces are measured by comparing their actual shapes to a precision master, which may be created using combinations of mirrors, lenses, and holograms. The work presented here develops several optical testing techniques that do not rely on a large or expensive precision, master reference surface. In a sense these techniques provide absolute optical testing.The Giant Magellan Telescope (GMT) has been designed with a 350 m2 collecting area provided by a 25 m diameter primary mirror made out from seven circular independent mirror segments. These segments create an equivalent f/0.7 paraboloidal primary mirror consisting of a central segment and six outer segments. Each of the outer segments is 8.4 m in diameter and has an off-axis aspheric shape departing 14.5 mm from the best-fitting sphere. Much of the work in this dissertation is motivated by the need to measure the surfaces or such large mirrors accurately, without relying on a large or expensive precision reference surface.One method for absolute testing describing in this dissertation uses multiple measurements relative to a reference surface that is located in different positions with respect to the test surface of interest. The test measurements are performed with an algorithm that is based on the maximum likelihood (ML) method. Some methodologies for measuring large flat surfaces in the 2 m diameter range and for measuring the GMT primary mirror segments were specifically developed. For example, the optical figure of a 1.6-m flat mirror was determined to 2 nm rms accuracy using multiple 1-meter sub-aperture measurements. The optical figure of the reference surface used in the 1-meter sub-aperture measurements was also determined to the 2 nm level. The optical test methodology for a 1.7-m off axis parabola was evaluated by moving several times the mirror under test in relation to the test system. The result was a separation of errors in the optical test system to those errors from the mirror under test. This method proved to be accurate to 12nm rms.Another absolute measurement technique discussed in this dissertation utilizes the property of a paraboloidal surface of reflecting rays parallel to its optical axis, to its focal point. We have developed a scanning pentaprism technique that exploits this geometry to measure off-axis paraboloidal mirrors such as the GMT segments. This technique was demonstrated on a 1.7 m diameter prototype and proved to have a precision of about 50 nm rms. Advisors/Committee Members: Sasian, Jose (advisor), Burge, James H. (committeemember), Chipman, Russell (committeemember), Martin, Hurbert (committeemember).

Subjects/Keywords: Optical metrology; Optical testing; absolute test; large mirrors; Aspheric surface; sub-aperture testing

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Su, P. (2008). Absolute Measurements of Large Mirrors . (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/194868

Chicago Manual of Style (16th Edition):

Su, Peng. “Absolute Measurements of Large Mirrors .” 2008. Doctoral Dissertation, University of Arizona. Accessed January 19, 2020. http://hdl.handle.net/10150/194868.

MLA Handbook (7th Edition):

Su, Peng. “Absolute Measurements of Large Mirrors .” 2008. Web. 19 Jan 2020.

Vancouver:

Su P. Absolute Measurements of Large Mirrors . [Internet] [Doctoral dissertation]. University of Arizona; 2008. [cited 2020 Jan 19]. Available from: http://hdl.handle.net/10150/194868.

Council of Science Editors:

Su P. Absolute Measurements of Large Mirrors . [Doctoral Dissertation]. University of Arizona; 2008. Available from: http://hdl.handle.net/10150/194868

.