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我在看zemax自定义面型的程序时，光线追迹的地方看不太懂，就是看不懂程序上面表达的意思是什么。 主要是下面的两段程序（下面的两段程序为平面衍射光栅的程序中的一部分）： 这两段程序，case4部分我看了几个面型的程序都是一模一样的，虽然不太理解，但应该照搬就可以了；case5部分每个面型对应不一样，这块理解不了。两部分里面的参数的意义，对应有.h文件里面有具体解释，我放在附件里面。同时附件我也放一个平面衍射光栅的和一般球面镜的完成程序，你参考下。 case 4: /*ZEMAX wants a paraxial ray trace to this surface */ /* x, y, z, and the optical path areunaffected, at least for this surface type */ /* for paraxial ray tracing, the returnz coordinate should always be zero. */ /* paraxial surfaces are always planeswith the following normals */ /* for paraxial ray tracing,grating effects are ignored */ /* this is exactly like the standardsurface code */ UD->ln = 0.0; UD->mn = 0.0; UD->nn = -1.0; power = (FD->n2 -FD->n1)*FD->cv; if ((UD->n)!= 0.0) { (UD->l) = (UD->l)/(UD->n); (UD->m) = (UD->m)/(UD->n); (UD->l) = (FD->n1*(UD->l)- (UD->x)*power)/(FD->n2); (UD->m) = (FD->n1*(UD->m)- (UD->y)*power)/(FD->n2); /* normalize */ (UD->n) = sqrt(1/(1 +(UD->l)*(UD->l) + (UD->m)*(UD->m) ) ); /* de-paraxialize */ (UD->l) = (UD->l)*(UD->n); (UD->m) = (UD->m)*(UD->n); } break; case 5: /*ZEMAX wants a real ray trace to this surface */ if (FD->cv == 0.0) { UD->ln = 0.0; UD->mn = 0.0; UD->nn = -1.0; if (Refract(FD->n1, FD->n2,&UD->l, &UD->m, &UD->n, UD->ln, UD->mn, UD->nn))return(-FD->surf); } else { /* okay, not a plane. */ a= (UD->n) * (UD->n) * FD->k + 1; b = ((UD->n)/FD->cv)- (UD->x) * (UD->l) - (UD->y) * (UD->m); c = (UD->x) *(UD->x) + (UD->y) * (UD->y); rad = b * b - a * c; if (rad < 0)return(FD->surf); /* ray missed thissurface */ if (FD->cv > 0) t =c / (b + sqrt(rad)); else t = c / (b - sqrt(rad)); (UD->x) = (UD->l) *t + (UD->x); (UD->y) = (UD->m) *t + (UD->y); (UD->z) = (UD->n) *t + (UD->z); UD->path = t; zc = (UD->z) *FD->cv; rad = zc * FD->k * (zc* (FD->k + 1) - 2) + 1; casp = FD->cv /sqrt(rad); UD->ln = (UD->x) *casp; UD->mn = (UD->y) *casp; UD->nn = ((UD->z) -((1/FD->cv) - (UD->z) * FD->k)) * casp; if (Refract(FD->n1, FD->n2, &UD->l, &UD->m,&UD->n, UD->ln, UD->mn, UD->nn)) return(-FD->surf); } /* okay, now account for the grating*/ /* the grating affects both therefraction angle and the phase, or OPD, of the ray */ T = FD->param[1]; M = FD->param[2]; L = FD->wavelength; /* here is the phase &phase change */ /* the ZEMAX convention is we subtractout the positive phase...*/ /* the index of the incident mediummust be divided out because ZEMAX will multiply in the index to convert pathto optical path! */ UD->path += UD->y*M*T*L /FD->n1; dpdx = 0.0; /* included hereonly for extension to the general case */ dpdy = M*T*L; /* This is a generic vector diffraction routinemore or less from W. T. Welford, Aberrations of optical systems,Adam Hilger Ltd 1986. */ /* account for possible change inindex or mirrors */ dpdy /= fabs(FD->n2); if (FD->n1*FD->n2 < 0) dpdy =-dpdy; if (FD->n1 < 0) nn =-1.0; else nn = 1.0; nx = -UD->ln; ny = -UD->mn; nz = -UD->nn; ux = UD->l + nn * (dpdx); uy = UD->m + nn * (dpdy); uz = UD->n; rad = nx*ux + ny*uy + nz*uz; rad = 1.0 - (ux*ux + uy*uy +uz*uz) + rad*rad; if (rad <= 0.0) rad = 0.0; else rad = sqrt(rad); UD->l = ux - (nx*ux + ny*uy+ nz*uz)*nx + nx * rad; UD->m = uy - (nx*ux + ny*uy+ nz*uz)*ny + ny * rad; UD->n = uz - (nx*ux + ny*uy+ nz*uz)*nz + nz * rad; break;
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发表于 2016-9-20 09:34
发表于 2016-9-20 13:18
发表于 2019-5-7 10:51
