Efficient optical modelling for far-infrared astronomical instrumentation

Créidhe O'Sullivan; J. Anthony Murphy; Neil Trappe; Marcin L. Gradziel; Tully Peacocke; Stafford Withington

doi:10.1117/12.857243

15 July 2010 Efficient optical modelling for far-infrared astronomical instrumentation

Créidhe O'Sullivan, J. Anthony Murphy, Neil Trappe, Marcin L. Gradziel, Tully Peacocke, Stafford Withington

Proceedings Volume 7741, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V; 77410R (2010) https://doi.org/10.1117/12.857243
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

Efficient optical modelling in the far infrared is challenging because of the dominance of diffraction effects in typical astronomical instruments. With the development of the next generation of array imagers and multi-moded feed systems the necessity for computational efficiency has become critical to ensure an optimised design, comprehensive system and telescope analysis and image deconvolution. A multi-technique capability is necessary to simulate both efficiently and accurately the propagation of the signal collected by the telescope through the quasi-optical beam guide and feed structures using an appropriate combination of modelling tools, seamlessly passing from one regime to the next from detector to sky. Physical optics for example, although computationally intensive, is useful tool when detailed telescope beam analysis is required, particularly for providing cross-polarisation information. Modal analysis is often appropriate for modelling beam guide structures while analysing the detector feed coupling may rely on a more complete electromagnetic analysis because of the small sizes involved and the use of waveguide and planar structures. Image recovery ideally requires a deconvolution technique based on a modal approach and precise knowledge of the beams on the sky. In this paper we report on our work in the continued development of such appropriate techniques with the particular goal of prototyping powerful efficient computational tools for imaging arrays and partially coherent systems. In the presentation, we will discuss these issues and present examples from real instrumentation.

Citation Download Citation

Créidhe O'Sullivan, J. Anthony Murphy, Neil Trappe, Marcin L. Gradziel, Tully Peacocke, and Stafford Withington "Efficient optical modelling for far-infrared astronomical instrumentation", Proc. SPIE 7741, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V, 77410R (15 July 2010); https://doi.org/10.1117/12.857243

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available