Dr. Tom E. Ingerson Profile

Dr. Tom E. Ingerson

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Proceedings Article | 27 June 2006 Paper

Revitalizing the LNA 1.6-m telescope with a versatile instrument support module

Fernando Santoro, Thomas Ingerson

Proceedings Volume 6269, 62695Q (2006) https://doi.org/10.1117/12.671540

KEYWORDS: Mirrors, Telescopes, Cameras, Image quality, Stars, Lamps, Imaging systems, Astronomy, Atmospheric optics, Projection systems

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In recent years, much astronomical observation has migrated to large shared facilities in excellent locations, e.g. Gemini, Keck, VLT, etc., often leaving underutilized smaller telescopes such as the 1.6M at the Brazilian National Observatory Pico Dos Dias (OPD). This is unfortunate, because research can often be done more cost-effectively on such telescopes, saving time on larger facilities. Smaller telescopes are also good platforms for the development and testing of new instruments. We have designed a new facility Instrument Support Module for the 1.6M. It will be under construction soon and should significantly increase the usefulness of the telescope at relatively low cost. The design is modular and incorporates a number of features. These include the capability of switching between up to four simultaneously mounted instruments; an inexpensive corrector that improves image quality and increases field size; a tip-tilt liquid prism; continuous auto focus; a facility guide/tip-tilt camera; a comparison lamp projector; and a target acquisition camera. This paper describes the design of the ISM and tests being performed to determine if the seeing of the site warrants building the tip-tilt module. The ISM design is straightforward and would be relatively easy to adapt for use on similar telescopes.

Proceedings Article | 28 September 2004 Paper

Instrument support modules for the SOAR telescope

Fernando Santoro, Thomas Ingerson, Hugo Schwarz, Roberto Tighe, Manuel Martinez, Juan Gallardo, Hugo Ochoa

Proceedings Volume 5489, (2004) https://doi.org/10.1117/12.551710

KEYWORDS: Mirrors, Lamps, Telescopes, Device simulation, Cameras, Beam steering, Optical alignment, Charge-coupled devices, Imaging systems, Projection systems

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The SOAR Telescope, near completion on Cerro Pachon - Chile, will carry Instrument Support Modules (ISMs) mounted at the two Nasmyth foci. Each ISM has three focal stations and is capable of making rapid instrument changes between them. Both ISMs also carry a Comparison Lamp System (CLS), guider and an acquisition camera, which are shared between the three instruments. One ISM supports IR instruments. The other is used for "Optical" instruments operating at wavelengths below 900nm. Beam steering mechanisms direct light from the SOAR science field or the CLS to the instrument in use. In the IR-ISM, light is sent to the lateral ports by dichroic mirrors which reflect IR and transmit wavelengths from 400-900nm to the guider. In the Optical-ISM, light is directed to the lateral ports by the use of first surface pick-off mirrors. Guiding is done off-axis. During operation, both ISMs can be rotated by 360° and must carefully control differential flexure between the guider and focal planes. A method of accurate relative flexure measurement has been developed where the ISM is rotated on its handling cart while carrying instrument mass simulators which reproduce its nominal payloads. In this paper, the ISM and its support sub-modules are described. Results of flexure measurements and tests of the CLS are provided.

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