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摘要: 4/HY[FT RP~vB#} 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。 95$pG/o /63W\ 背景: "M9TB. O Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 %="~\1y FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 nszpG1U: 图1. RPC Photonics工程漫射体结构及光束投射形状 !cN?SGafZI QIij>!c4 ~']&. 步骤 :kME ]r/(n]=( 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 x1m8~F qPXANx<^ 图2. RPC Photonics工程漫射体不同类型的散射数据 ?JXBWB4 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) C3
gZ6m 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 #$rf-E5g-K 例如下所示: Z7/vrME6 Sample name: EDF-C1-56 I" 8d5a} Merging data from file EDF-C1-56 0-0.txt Ynv9&P Finished merging RPC data for sample EDF-C1-56 *D=K{bUe' FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 69[V <1 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 \#\`!L[1 a. 创建一个新的散射库 NK+FQ^m[ b. 散射模型命名 <S\;k@f c. 改变散射模型为“Tabulated BSDF”. gB/;clCdX) 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 ) lSn5=^]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。 ]PR|d\O 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, `"xk,fVYd g. 点击OK O%YjWb 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 QO5OnYh Jj=yG"$! xNC* ]8d 脚本代码: W:VW_3 l9_m>X~ '#Language "WWB-COM" ojN`#%X !: m`9o8 Option Explicit gf:vb*#Wa s~'9Hv9 Sub Main ?*CRa$_I| <WM -@J(1 'Cleanup _wm~}_Q ClearOutputWindow() CCuxC9i7 !(W[!% Print "Merging RPC Photonics BSDF Data Files" 4]"a;( SetTextColor(255,0,0) i'Y-V]-> Print "Note: Script should be located in the same folder as the BSDF TXT files." @
\!KF*v Print "Note: Do not run this script multiple times without deleting the output file between executions." W:`5nj]H9 SetTextColor(0,0,0) Z -pyFK\ ge^!F>whr 'Current directory of this script (should be the same as the text files being merged) tW:W&|q Dim cDir As String
P7}t lHX cDir = MacroDir$ & "\" xM% H~( {udrT"h 'Array which will be populated with the list of files to be merged AiY|O S3R Dim fList() As String, curFile As String qzz[y#q( GetFileList( cDir, fList ) jZa25Z00 q|n97.vD Print "" ])N|[ |$ Print "Files found for merging:" .KFA218h*x For Each curFile In fList ;rNd701p" Print Chr(9) & curFile p:Iw%eZ: Next NU|qX {- 40 Au9o 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. CIIY|DI`l Dim nameArray() As String, sampName As String ''_,S,.a20 nameArray = Split(fList(0)," 0-0.txt") H9sZR>(^ sampName = nameArray(0) gB>(xY>LrA Print "" O-i4_YdVt Print "Sample name: " & Chr(9) & sampName D._{E*vg +<gg 'Open an output file and write the FRED header data -_s%8l^ Dim outFile As String d
"2wO[ outFile = cDir & sampName & "_FRED.txt" =nLO?qoe Open outFile For Output As #1 mRwXN*Izw Print #1, "type bsdf_data" s5Pq$< Print #1, "format angles=deg bsdf=value scale=1" &8Zeq3~ w"q-#,37j 'Loop the file list, skip the two header lines and write the remaining data to file R'Sa?6xS4 Dim lineArray() As String, curLine As Long >+L7k^[,0 For Each curFile In fList aZP2R" Print "Merging data from file " & curFile :){)JZ}-95 ReadFile( cDir & curFile, lineArray ) bi+9R-=& For curLine = 2 To UBound(lineArray) Cm^Ylp Print #1, lineArray(curLine) Xc{ZN1 4n Next 9`&?hi49nK Next ol50d73B KrS 'Close the output file I[@ts!YD Close #1 :*=Ns[Y M
Z2^@It Print "Finished merging RPC data for sample " & sampName 'Cg V0&@ Print "FRED formatted data file: " & Chr(9) & outFile kl=xu3j End Sub </,.K`''W N5yJ'i~,M 'Utility function to read the contents of a file into an array of strings. K6-6{vt Function ReadFile(ByVal fileName As String, _ 'gYg~= ByRef lineArray() As String) As Long (/-lV&eR
x9h?e` ReadFile = -1 nkTYWw Dim oFSO As Object iZC>)&ax Set oFSO = CreateObject("Scripting.FileSystemObject") F9%,MSt Erase lineArray 7vw;Egd@@- ka/nQ~_#< Dim fid As Long /\d(c/, 4 If oFSO.fileexists( fileName ) Then Zgy7!AF! fid = FreeFile() aFyh, Open fileName For Input As fid >d#3|;RY lineArray = Split(Input(LOF(fid), fid), vbCrLf) Sg_O?.r Close fid [O(m/ End If u
>4ArtF Set oFSO = Nothing uj)yk* Return UBound( lineArray ) "$r1$mBi alVdQfu End Function r|<6Aae& \Y+") Sub GetFileList( ByVal in_dir As String, _ ;uK";we ByRef in_flist() As String ) .8K6C]gw ewpig4 'Redimension the file list array Gy9
$Wj Erase in_flist lirN YJ]tO x7HA722w 'Tracks how many files are found 0 k9<& Dim fCount As Long CG.,/]_ fCount = 0 UoHd - EZ/^nG 'Recurse directory and search for text files ;?zF6zvQ Dim f As String *Z; r
B f = Dir$(in_dir & "*.txt") Je 31". While f <> "" *,0+RAS vq ReDim Preserve in_flist(fCount) ?,>5[Ha^? in_flist(fCount) = f V:OiW"/ fCount += 1 Y([d;_#P f = Dir$() i-]U+m* Wend yyjw?#\8 ReDim Preserve in_flist(fCount-1) O>%$q8x@i (xu=% End Sub []gRfM]$&
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