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271 272 273 274 275 276 277 278 279 that only angles between −45◦ and 45◦ are of interest for this study, given that the octagonal layout of the IR ring of YAIR makes it difﬁcult to obtain greater angles of incidence within the range of 1 m of distance.) After the estimation of the angle of incidence, it is now possible to obtain the compensated distances x1 and x2 , using the following formula: √ √ x1 = x1 cos θ, x2 = x2 cos θ, (14) tan θ R =√ . 3, the following expression can be written to obtain the relationship between εθ and εy : (x1 + εx1y ) − (x2 + εx2y ) tan(θ + εθ ) = , L (25) x1 3 x2 3 εy 1 − εy 2 .
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