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A Stray Light Analysis of the Apache Point Observatory 3.5

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A Stray Light Analysis of the Apache Point Observatory 3.5 scatter paths that directly illuminate the focal plane. Our A Stray Light Analysis of the approach to stray light reduction was to address the light Apache Point Observatory 3.5- paths revealed by the various PST calculations. Our calculations have shown that significant gains can be MeterTelescope System realized with simple modifications to the telescope system. Stephen M. Pompeaa, Richard N. Pfisterer', and Jeffrey S. Morganc 1. INTRODUCTION aNational Optical Astronomy Observatory, Tucson, The role of stray light analysis in improving telescope Arizona1, bphotofl Engineering LLC, Tucson, Arizona2, and telescope system performance has been well- cDepment of Astronomy, University of Washington, established in space telescopes such as SIRTF' and in Seattle, Washington3 ground-based telescopes such as the Sloan Digital Sky Survey Telescope.2 The general approach has been ABSTRACT previously summarized for both space systems3 and for ground-based systems with adaptive optics.4 Advances A stray light analysis ofthe Apache Point Observatory in stray light analysis have recently made this approach 3.5 meter telescope system was done to understand the even more effective for analysis of telescope/instrument performance for a variety ofimaging modes. The systems.5 The current computer analysis programs such telescope system consists ofthe 3.5-m telescope, its as ASAP and Fred can analyze systems of greater enclosure, and its associated imaging cameras. The complexity and in more detail than previously possible. purpose ofthe study was to assess the stray light These advances allow direct comparisons between focal performance of this system, identify where plane stray light analysis images generated using a well- modification(s) would improve the system off-axis constructed computer model and actual imaging data rejection characteristics, and assess the effectiveness of from point sources. These comparisons can also be used those modifications. A detailed telescope system to validate complex stray light models, such as the ones geometry model was created, and scatter models were presented in this paper. The current study highlights the created for telescope and enclosure components. The effectiveness of stray light studies in generating accurate computer model we created duplicated the pinhole stray values of stray light levels, and in describing the spatial light images taken with the telescope, thereby verif,'ing variations ofstray light across the focal plane. the model. The Point Source Transmittance (PST), a commonly used metric for assessing stray light was used The University of Washington wished to both improve to evaluate the stray light performance ofthe system for the stray light rejection ofthe Apache Point a number ofoff-axis angles and to suggest modifications Observatory's 3.5-m telescope when used with the to enhance the system. current suite of telescope instrumentation and to evaluate the performance ofthe telescope ifit were to be The baseline PST ofthe existing system shows virtually used with a wide field imaging camera. The proposed no falloffwith off-axis angle in the plane of the camera had a rectangular FOV with an angular coverage observatory slit. This is the result of(1) the focal plane of0.32° X 0.80° when used on the 3.5-m telescope. having a large, unobstructed view ofthe Nasmyth mirror Hereafter, we will refer to this wide field configuration and cell, primary mirror cell, and baffles mounted on the as the UWBC (UW Big Camera). Nasmyth cell, (2) relatively unobstructed illumination of telescope over a large range ofangles in the plane of the This paper describes efforts towards an understanding slit, and (3) secondary and Nasmyth baffles that are not ofthe scattered light problems with the current telescope enclosed. These attributes create a series of first-level configuration and those that will be encountered with the telescope system incorporating this wide-field imager. The goals ofthis work were to identify where 'NOAO, 950 N. Cherry Avenue, Tucson, AZ 85719. Also, modifications ofthe 3.5-m telescope system would Adjunct Associate Astronomer, Steward Observatory, improve the off-axis rejection characteristics of the University of Arizona. This work was done as a consultant before the author was affiliated with NOAO. Email: telescope and to assess the effectiveness of those modifications. The main focus of this work was to [email protected] 2 Engineering, LLC P.O. Box 31316, Tucson AZ improve the on-axis performance of the telescope. 8575 1. Email: richpphotonengr.com However, in light of development efforts on the UWBC, University of Washington, Box 351580, Seattle WA, 98195. a second goal of this project was to evaluate the off-axis Email: morganastro.washington.edu 128 Specialized Optical Developments in Astronomy, Eli Atad-Ettedgui, Sandro D'Odorico, Editors, Proceedings of SPIE Vol. 4842 (2003) © 2003 SPIE · 0277-786X/2003/$15.00 Downloaded from SPIE Digital Library on 20 Nov 2009 to 150.135.239.97. Terms of Use: http://spiedl.org/terms scattering for a wide field ofview system and to make view in two orientations of the instrument rotator were sure that the suggested modifications will not impede made. For each rotator position, we computed the stray the performance ofthe wide-field system. A key aspect light level before and after the suggested baffling ofthis study is the attention given to stray light as a modifications. These calculations were done at a system issue, involving the telescope, enclosure, camera, reduced spatial resolution for angles of interest of the and operations. off-axis source. There were four stages to this effort. First, the model of 2. COMPUTER MODEL OF SYSTEM the telescope system was constructed, briefly illustrated GEOMETRY AND SCATTER in Figures 1-3. We used the prescription ofthe optical CHARACTERISTICS system, a description ofall coatings used in the optical In order to be effective, computer modeling of telescope system, and drawings ofthe current support structures systems must be accurate and sufficiently detailed. In and baffles to construct a model. This model included particular, the surface scatter characteristics of the the optical properties ofall mechanical structures on the surfaces in the system, including mirror, baffle, and telescope itselfand even the optical properties of the various other system surfaces must be well-known. observing floor, the telescope enclosure, and the catwalk Efforts in the US and Canada to establish databases of which allows service personnel access to the top of the the scatter properties of surfaces6 have greatly aided this telescope structure. The catwalk consists of an open effort, as have reviews ofthe measured scatter properties grate floor and its associated railings on three sides of ofsurfaces.7 A summary ofoptical models and the telescope at about the level ofthe telescope measurements of black surfaces is given in the secondary when the telescope is pointed toward the Handbook ofOptics chapter on this topic8 and is zenith. For the purpose ofvalidating this telescope particularly useful for black baffle surface modeling. model, we obtained a set of stray light pinhole Similarly, realistic optical models ofmirror surfaces in measurements from the telescope. the observatory environment must also be constructed. Stray light modeling software allows the selection of The second stage was to compare the results from our simple scatter models or the construction of more computer model with on-axis measurements in order to complex scatter models based on bidirectional both understand the limitations ofthe model and to reflectance scatter distribution function (BRDF) improve it. The goal ofthis second stage ofwork was to measurements at a particular wavelength. produce model estimates ofboth the average level of scattered light and contour plots showing the variation We constructed models ofabout 50 surfaces of the ofscattered light within the field ofview ofthe Seaver telescope system, including the gray linoleum that Prototype Imaging camera (SPIcam), a general purpose comprises the observing floor. Of greatest importance direct imaging CCD camera. It contains a backside were models of black baffle surfaces such as the ones illuminated SITe 2048x2048 pixel device with 24- coated with Aeroglaze Z-306. The BRDF model of micron pixels and a plate scale ofO.14 arcseconds per Aeroglaze Z-306 used in the model was based upon pixel, giving a field ofview of4.78 arcminutes. The actual measurements and is shown in Figure 4. On the x- model estimates of stray light levels were made for axis is plotted log10 Isintheta —sintheta ,wheretheta several off-axis angles for a point source. and thetao are the scatter and specular angles measured from the surface normal. On the y-axis we plot the log10 The third stage ofthis effort was to use the model to ofthe BRDF for this coating. evaluate the stray light rejection characteristics of the telescope under variable conditions. These calculations Since the BRDF ofan ideal Lambertian scatterer is a were used to determine off-axis angles instructive to the constant for all angles, this data indicates that the scatter stray light performance of the system and to suggest from Aeroglaze is not Lambertian. The data shows an modifications to the telescope baffling. The suggested increasing forward-scatter component that means that modifications considered ranged from simple significant amounts of power will be scattered at larger modifications of the present design to a complete angles of incidence. redesign of the baffle system. An important part of the The mirror surfaces were assigned composite models to third stage of this effort was to evaluate what effects the represent both specular and scatter characteristics. Since proposed baffling modifications will have on the the particulate deposition rates in observatories are not UWBC's field of view. For this evaluation, model well-studied, we would have preferred to have the estimates of the stray light across the UWBC's field of mirror surfaces examined and particulate counts made in Proc. of SPIE Vol. 4842 129 Downloaded from SPIE Digital Library on 20 Nov 2009 to 150.135.239.97.
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