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摘要: 4[ S0~O{r f4s^$Q{Q RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 2ja@NT xz+Y 1fYT 背景: CTbz?Kn Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 CZ/bO#~ FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 Y]5\%JR 图1. RPC Photonics工程漫射体结构及光束投射形状 h9McC 3 ,u^S(vxyz `J>76WN 步骤 [3s p yW$ja|^E 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 R|%R-J] +7jr ]kP9 图2. RPC Photonics工程漫射体不同类型的散射数据 2o`a^'Iw 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) Q}J'S5% 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 5pBQ~m3 例如下所示: rpgr5> Sample name: EDF-C1-56 s_=/p5\ Merging data from file EDF-C1-56 0-0.txt _l&`*
2d Finished merging RPC data for sample EDF-C1-56 |EJ&s393& FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt S^GB\uJ 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ~h~K"GbC? a. 创建一个新的散射库 s<I[)FQVr b. 散射模型命名 /`3^?zlu" c. 改变散射模型为“Tabulated BSDF”. 'oZ/fUl|7 d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) jhWNMu e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 v5|X=B>&> f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, 9E (VU. g. 点击OK ^N!l$&= 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 1Ftl1uf g<[_h(xDeG p%A(5DE 脚本代码: =?`5n|A* GfAt-huL( '#Language "WWB-COM" O jkbv PMJe6*(x/ Option Explicit 8@)/a kU8V,5 Sub Main ;SzOa7 V|> u, 'Cleanup Jy'ge4]3 ClearOutputWindow() ^;3z9}9 %d+:0.+`n Print "Merging RPC Photonics BSDF Data Files" "h/{YjUS SetTextColor(255,0,0) -{>Nrx| Print "Note: Script should be located in the same folder as the BSDF TXT files." R>"E Xq Print "Note: Do not run this script multiple times without deleting the output file between executions." A/W-'%+` SetTextColor(0,0,0) "HW~|M7>( {m9OgR5U 'Current directory of this script (should be the same as the text files being merged) Ox"4 y Dim cDir As String A6'G%of
cDir = MacroDir$ & "\" ?op6_a-wm G 3P3 'Array which will be populated with the list of files to be merged "Hmo`E B0 Dim fList() As String, curFile As String t;9f7~ GetFileList( cDir, fList ) S] Gw}d]4 /vFw5KUu Print "" hu-fwBK Print "Files found for merging:" h3issi+N For Each curFile In fList
?lzg )88I Print Chr(9) & curFile WlVC0& Next cpB$b C]( or/Y"\-! 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. ;JpU4W2/ Dim nameArray() As String, sampName As String M_V\mYC8I nameArray = Split(fList(0)," 0-0.txt") ^;B
vd! sampName = nameArray(0) od|w)?16 Print "" w
.l2 Print "Sample name: " & Chr(9) & sampName 5AR\'||u 0fnd9`N!0 'Open an output file and write the FRED header data ([s}bD.9 Dim outFile As String HoGrvt<:.P outFile = cDir & sampName & "_FRED.txt" pB{QO4qn Open outFile For Output As #1 y";{k+ Print #1, "type bsdf_data" ;$(a+? Print #1, "format angles=deg bsdf=value scale=1" >`8r 52 6q?C"\_ 'Loop the file list, skip the two header lines and write the remaining data to file 1i9}mzy% Dim lineArray() As String, curLine As Long &|xN=U/ For Each curFile In fList eKpH|S!xU Print "Merging data from file " & curFile e J>(SkR:[ ReadFile( cDir & curFile, lineArray ) ,U2
/J For curLine = 2 To UBound(lineArray) o"t+G/M Print #1, lineArray(curLine) vk+TWf Next GiB3.%R` Next N(Us 9 Y_S^B)y 'Close the output file
N\DEY] Close #1 UaCEh?D+Y 'OSZ'F3PV Print "Finished merging RPC data for sample " & sampName $k*E^~qT Print "FRED formatted data file: " & Chr(9) & outFile L #p-AK End Sub nCEt*~t9VE :{%6<j 'Utility function to read the contents of a file into an array of strings. ofl3G
{u Function ReadFile(ByVal fileName As String, _ -O3^q. ByRef lineArray() As String) As Long `N}<lg(0# .Xh ^L ReadFile = -1 eh nN Dim oFSO As Object ~my\{q Set oFSO = CreateObject("Scripting.FileSystemObject") ROr$S z Erase lineArray ^-P lTmT ]q7\
Dim fid As Long k&ujr:)5Y5 If oFSO.fileexists( fileName ) Then e2;19bj& fid = FreeFile() '@RlKMnN Open fileName For Input As fid Fkj\U^G lineArray = Split(Input(LOF(fid), fid), vbCrLf) !NK8_p|X Close fid ;%odN
d End If 8$-Wz:X& Set oFSO = Nothing ho
?.\Jq Return UBound( lineArray ) VR2BdfKU, "EF:+gi#" End Function c, \TL
] Q<P],}?: Sub GetFileList( ByVal in_dir As String, _ SQWwxFJ ByRef in_flist() As String ) dgE|*1/0 fyT:I6* 'Redimension the file list array 2X;,s`) Erase in_flist #JeZA0r5 KWCA9.w4q 'Tracks how many files are found ;2@MPx Dim fCount As Long %#2[3N{ fCount = 0 \06fP4? KnbT2 'Recurse directory and search for text files #* j Dim f As String G+ Y`65 f = Dir$(in_dir & "*.txt") -o6K_R}R While f <> "" ? QwDV` ReDim Preserve in_flist(fCount) }4ijLX>b in_flist(fCount) = f B4pheKZ2 fCount += 1 G9:[W"P f = Dir$() 5[]7baO)h1 Wend DoX#+
07u4 ReDim Preserve in_flist(fCount-1) v$p<6^kJ X8<<;?L End Sub (ScL C
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