Measuring large mirrors using SCOTS: the Software Configurable Optical Test System

Large telescope mirrors are typically measured using interferometry, which can achieve measurement accuracy of a few nanometers. However, applications of interferometry can be limited by small dynamic range, sensitivity to environment, and high cost. We have developed a range of surface measurement solutions using SCOTS, the Software Configurable Optical Test System, which illuminates the surface under test with light modulated from a digital display or moving source. The reflected light is captured and used to determine the surface slope which is integrated to provide the shape. A range of systems is presented that measures nearly all spatial scales and supports all phases of processing for large telescope mirrors.

[1]  James H. Burge,et al.  Fabrication of the LSST monolithic primary-tertiary mirror , 2012, Other Conferences.

[2]  James H. Burge,et al.  Scanning Long-wave Optical Test System: a new ground optical surface slope test system , 2011, Optical Engineering + Applications.

[3]  Chunyu Zhao,et al.  Orthonormal vector polynomials in a unit circle, Part I: Basis set derived from gradients of Zernike polynomials. , 2007, Optics express.

[4]  Lirong Wang,et al.  Software configurable optical test system: a computerized reverse Hartmann test. , 2010, Applied optics.

[5]  Mourad Idir,et al.  Non-null full field X-ray mirror metrology using SCOTS: a reflection deflectometry approach. , 2012, Optics express.

[6]  James H Burge,et al.  Binary pattern deflectometry. , 2014, Applied optics.

[7]  Run Huang,et al.  Measurement of a large deformable aspherical mirror using SCOTS (Software Configurable Optical Test System) , 2013, Optics & Photonics - Optical Engineering + Applications.

[8]  James H Burge,et al.  Design and optimization of the sine condition test for measuring misaligned optical systems. , 2013, Applied optics.

[9]  Christian Faber,et al.  Deflectometry challenges interferometry: the competition gets tougher! , 2012, Other Conferences.

[10]  Juergen Beyerer,et al.  Three-dimensional measurement of specular free-form surfaces with a structured-lighting reflection technique , 1997, Other Conferences.

[11]  Markus C. Knauer,et al.  Phase measuring deflectometry: a new approach to measure specular free-form surfaces , 2004, SPIE Photonics Europe.

[12]  Peng Su,et al.  Measuring rough optical surfaces using scanning long-wave optical test system. 1. Principle and implementation. , 2013, Applied optics.

[13]  Guillaume P. Butel Analysis and New Developments Towards Reliable and Portable Measurements in Deflectometry , 2013 .

[14]  Chunyu Zhao,et al.  Orthonormal vector polynomials in a unit circle, Part II : Completing the basis set. , 2008, Optics express.

[15]  James H. Burge,et al.  SCOTS: a useful tool for specifying and testing optics in slope space , 2012, Other Conferences.

[16]  Peng Su,et al.  Development of a portable deflectometry system for high spatial resolution surface measurements. , 2014, Applied optics.

[17]  James H. Burge,et al.  Open-source data analysis and visualization software platform: SAGUARO , 2011, Optical Engineering + Applications.

[18]  James H. Burge,et al.  Advanced surface metrology for meter-class optics , 2013, Optics & Photonics - Optical Engineering + Applications.

[19]  Armando Riccardi,et al.  The adaptive secondary mirror for the Large Binocular Telescope: optical acceptance test and preliminary on-sky commissioning results , 2010, Astronomical Telescopes + Instrumentation.