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摘要: CUHT5J*sY 6(BgnH8oc 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。 z{FFTb^B V#b=mp 背景: J3(E{w8Q 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。 H
cyoNY 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。 QxN1N^a0 图1. RPC Photonics工程漫射体结构及光束投射形状 ]31=8+D x$bUd 9 c/ih%xR 步骤 x}nBUq: 3Pllxq<n 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 u1Slu%^e C\aHr! 图2. RPC Photonics工程漫射体不同类型的散射数据 t=xEUOQAn 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) dgIH`<U$ 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 Aq*?Q/pV 例如下所示: 1_#;+S Sample name: EDF-C1-56 q5L^>" Merging data from file EDF-C1-56 0-0.txt IM7<z,* oF Finished merging RPC data for sample EDF-C1-56 D7T|K :F) FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt AS@(]T#R 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 "M!m-] a. 创建一个新的散射库 gua7<z6=eh b. 散射模型命名 Lt=32SvTn c. 改变散射模型为“Tabulated BSDF”. Rw%?@X3m] 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 ) 1kw*Q: 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。 xY#J((-iH 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, (XW'1@b g. 点击OK =JgR c7 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 [U8/nT *i^$xjOa <+-n
lK4 脚本代码: Hz."4nhv abm 3q!a- '#Language "WWB-COM" N0Y4m_dm* <Q/)SN6_E Option Explicit [A/2
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Sub Main Z\EA!Cs3 \20}/& 'Cleanup Zfcf?&>< ClearOutputWindow() A8{ xZsH !CcDA/0 Print "Merging RPC Photonics BSDF Data Files" MO0NNVVi%U SetTextColor(255,0,0) WV.hQX9P Print "Note: Script should be located in the same folder as the BSDF TXT files." $x+7.%1m)~ Print "Note: Do not run this script multiple times without deleting the output file between executions." )=d)j^t9 SetTextColor(0,0,0) )!\6 "{ 8K-P]] 'Current directory of this script (should be the same as the text files being merged) <{Y3}Q Dim cDir As String SFd_k9 cDir = MacroDir$ & "\" f"P866@oWn aG^E^^Y 'Array which will be populated with the list of files to be merged 1' U Dim fList() As String, curFile As String ;Vat\,45pg GetFileList( cDir, fList ) wCg7JW# 3PZ(Kn< Print "" 4S~kNp$ Print "Files found for merging:" CvE^t#Bok For Each curFile In fList >Ti%Th, Print Chr(9) & curFile 7Tdx*1 U Next yzp# &RARK8^ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 8IRKCuV Dim nameArray() As String, sampName As String 7<!x:G?C nameArray = Split(fList(0)," 0-0.txt") qz]qG=wmL sampName = nameArray(0) \f?
K74 Print "" P@ew' JL% Print "Sample name: " & Chr(9) & sampName >pLJ ,Z 7;AK=; 'Open an output file and write the FRED header data .,xyE--;d Dim outFile As String O}Pqbx& outFile = cDir & sampName & "_FRED.txt" # euG$( Open outFile For Output As #1 ~LpkA`Hn! Print #1, "type bsdf_data" U|tacO5w` Print #1, "format angles=deg bsdf=value scale=1" [;Lgbgt3f 'LPyh ;!f 'Loop the file list, skip the two header lines and write the remaining data to file ZH;4e<gg Dim lineArray() As String, curLine As Long !>> A@3 For Each curFile In fList 3=sBe HL Print "Merging data from file " & curFile F&R*njJcc ReadFile( cDir & curFile, lineArray ) LxhS
9 For curLine = 2 To UBound(lineArray) YZ+G7D> Print #1, lineArray(curLine) yP+<kv4 Next }k-8PG = Next U'ctO% vRC >=y*= 'Close the output file |YROxY"ML Close #1 ydYsmTr ?#
FYF\P Print "Finished merging RPC data for sample " & sampName dv\bkDF4A Print "FRED formatted data file: " & Chr(9) & outFile "/e)v{ End Sub 4bA^Gq FqA4 OU 'Utility function to read the contents of a file into an array of strings. #z.n?d2Gd Function ReadFile(ByVal fileName As String, _ 06^/zr ByRef lineArray() As String) As Long b`D]L/}pr 27ZqdHd ReadFile = -1 OS@uGp=
Dim oFSO As Object -_t4A * Set oFSO = CreateObject("Scripting.FileSystemObject") d=^QK{8 Erase lineArray ;K\2/"$QD hxMRmH[f: Dim fid As Long Eej
Lso#\ If oFSO.fileexists( fileName ) Then #W)m({} fid = FreeFile() B;(U?gC Open fileName For Input As fid M{G}-QK_. lineArray = Split(Input(LOF(fid), fid), vbCrLf) CdRJ@Lf Close fid Jk(V ] End If ~M^[ Set oFSO = Nothing [%bGs1U Return UBound( lineArray ) ,b!D8{W"N r6uN6XCM End Function 0)d='3S T{Xd > Sub GetFileList( ByVal in_dir As String, _ u*2?Gky ByRef in_flist() As String ) 3#t#NW*e P'tXG 'Redimension the file list array ,M{G
X Erase in_flist 4Z%1eOR9V bI:W4y>I= 'Tracks how many files are found )1#/@cU Dim fCount As Long #)~u
YQ fCount = 0 K:'^f? P k5aB|xo 'Recurse directory and search for text files C\5G43` Dim f As String YT+b{ f = Dir$(in_dir & "*.txt") )TiM>{ While f <> "" XjL3Ar* ReDim Preserve in_flist(fCount) /.7RWy` in_flist(fCount) = f S=)
c7t?a fCount += 1 YdO*5Gb6 f = Dir$() e7"T37 Wend z7IJSj1gQI ReDim Preserve in_flist(fCount-1) <(>t"< `OMX 9i End Sub o 7kg.w|
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