Related Experiment Videos
Modal analysis of astronomical bolometric interferometers
Stafford Withington1, Michael P Hobson, Edward S Campbell
1Cavendish Laboratory, Madingley Road, Cambridge CB3OHE, UK. stafford@mrao.cam.ac.uk
Summary
A new eigenfield procedure models astronomical bolometric interferometers. This method offers an orthogonal basis for analyzing field propagation and noise, improving interferometer performance modeling.
Area of Science:
- Astronomy and Astrophysics
- Optical Engineering
- Signal Processing
Background:
- Astronomical bolometric interferometers are crucial for sensitive sky observations.
- Modeling their behavior requires accounting for complex field propagation and detector responses.
Purpose of the Study:
- To introduce a novel procedure for modeling astronomical bolometric interferometers.
- To establish a fundamental framework based on eigenfields for analyzing interferometer behavior.
Main Methods:
- The procedure utilizes the concept of eigenfields, defining input and output field distributions.
- Eigenfields provide an orthogonal basis for propagating second-order statistical properties of fields.
- This method accounts for optical configuration, beam combination, and detector coupling.
Main Results:
- The scheme enables calculation of coupled power for coherent, partially coherent, and incoherent imaging arrays.
- It effectively incorporates spatially distributed noise sources from individual telescopes.
- Eigenfields are shown to be more fundamental than eigenmodes for this modeling.
Conclusions:
- The eigenfield procedure offers a robust and versatile method for modeling astronomical bolometric interferometers.
- This approach enhances the understanding and prediction of interferometer performance, including noise effects.
- The framework is applicable across various optical configurations and array types.