Abstract
Abstract In the context of space-based optics, contamination due to particle deposition on the optics is inevitable and constitutes a critical issue. This gets more challenging for the sensitive heterodyne measurements of the Laser Interferometer Space Antenna (LISA), the space-based gravitational wave observatory to be launched in 2034. Therefore, table-top experiments need to be developed for a better understanding of how micrometer to millimeter sized dust particles, present on optical surfaces, affect LISA measurements. In this work, we present an experimental setup for the simultaneous measurement of the coherent backscattering and the monitoring of particles deposition on the optics to be tested. The results of the first measurements are presented and discussed in this article.
Highlights
In the context of space-based optics, contamination due to particle deposition on the optics is inevitable and constitutes a critical issue
Table-top experiments need to be developed for a better understanding of how micrometer to millimeter sized dust particles, present on optical surfaces, affect Laser Interferometer Space Antenna (LISA) measurements
We present an experimental setup for the simultaneous measurement of the coherent backscattering and the monitoring of particles deposition on the optics to be tested
Summary
Our imaging methodology is described in the following. In the first instance, a sparse and positive image composed of compact structures is estimated from the original image using convex optimisation theory and sparse representations framework [4]. LAB built-in functions where segmentation is performed, followed by the classification of the detected spots (size, position, flux, peak intensity). A Gaussian fit is performed on each of the identified bright sources to extract information on their major and minor axis, spot area, flux and peak intensity. In our pictures the pixel-size, and the pixels separation, corresponds to 5 μm This value is slightly better than the 7-8 μm that can be expected from the MTF (modulation transfer function) of the macro objective lens presented in the manufacturer’s documentation
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