Tham khảo tài liệu 'nonimaging optics winston episode 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | The Finite Disk Source with Rotational Optics 169 y component of P2 X T2 0. Estimate an intermediate point P12 P1 P2 2 and its normal N12 N1 N2 2. 3. Carry out the 3D ray-tracing on P12 associating it with the area of refractive surface between P1 and P2 with the direction of impingement U Ỡ2 to obtain the value AAap12 and thus calculate Aap2 d2 Aap1 d2 AAap12 estimated angular response for the angle Ớ2 of the portion of lens up to P2. 4. Repeat the steps from 2 to 3 iterating on the value of the parameter s note that AAap12 increases with s until obtaining that 1 - Aap Q2 Aap2 d2 e e being a preset margin of error. 5. Carry out the 3D ray-tracing on the point P12 resulting from the iteration 4 associating it with the area of the refractive surface between P1 and the point P2 resulting from the iteration 4 in order to obtain the function AAap12 ff and thus calculate Aap2 ff Aap1 ff AAap12 ớ estimated angular response of the portion of lens up to P2. 6. Increase the value ớ3 ớ2 AỚ and repeat the steps from 2 to 5 increasing the subindices by one unit until for a given angle dn the coordinate z of point Pn is negative. 7. Repeat the steps 1-6 iterating on the abscissa of point P1 until 1 - dn ỘmaxI e e being another preset margin of error. The design is finished. The refractive surface is defined by the set of points calculated in the process. If required it is possible to fit these points by a spline or a polynomial curve which facilitates handling of the data. The design guarantees that the prescription is adjusted in the whole range 0 d dM but the stepped transition to zero at d dM is not . the prescription for 8 dM cannot be adjusted because there are no degrees of freedom to make the outer portion of the lens perform as a Cartesian oval as done in Section for the linear case . However it should be emphasized that the design procedure uses rays impinging on the receiver from nearly all possible directions the whole field of view of the photodiode is
