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Figure 12
Zemax simulation system of the NT method with a point secondary light source. (a) Schematic of the verification system designed in the non-sequential mode of Zemax. (b) Angle errors [\Delta\theta] = [{\theta}^{\,\prime}-\theta] obtained from Zemax simulations within an angle range of ±5 mrad. θ is the angle variation of the mirror, θ′ is the measured angle of the NT method and the aperture of the pinhole is 1 mm.

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