Forward modelling of turbulence strength profile estimation using S-DIMM+

Saraswathi Kalyani Subramanian; Sridharan Rengaswamy

doi:10.1117/12.2671735

11 May 2023 Forward modelling of turbulence strength profile estimation using S-DIMM+

Saraswathi Kalyani Subramanian, Sridharan Rengaswamy

Proceedings Volume 12638, Women in Optics and Photonics in India 2022; 1263812 (2023) https://doi.org/10.1117/12.2671735
Event: Women in Optics and Photonics in India, 2022, Bangalore, India

Conference Poster

Abstract

Knowledge of the refractive index structure constant profile at an astronomical site is crucial before developing a Multi-Conjugate Adaptive Optics (MCAO) system at that site. The S-DIMM+ (S-Differential Image Motion Monitor+) method proposed by Scharmer and van Werkhoven uses the images recorded by a SHWFS (ShackHartmann Wavefront Sensor) to estimate the profile. We have performed simulations of the same using simulated solar granulation images (which are the “objects”) and multiple layers of the atmosphere characterised by Kolmogorov turbulence, a telescope of given aperture and finally a SHWFS. The images formed using the SHWFS are then processed using an inversion code developed by us to get the turbulence strength profile. We found that the code was able to invert the data satisfactorily upto a height of 10 km with our system parameters.

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Saraswathi Kalyani Subramanian and Sridharan Rengaswamy "Forward modelling of turbulence strength profile estimation using S-DIMM+", Proc. SPIE 12638, Women in Optics and Photonics in India 2022, 1263812 (11 May 2023); https://doi.org/10.1117/12.2671735

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