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摘要: 5hh6;) oArXP\# 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。 !,C8 ?6HnN0A) 背景: Dy:r)\KX 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。 $<"I*l@ FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 ah,"c9YX 图1. RPC Photonics工程漫射体结构及光束投射形状 c^&4m[?C[u 64vj6 &L [KCR@__ 步骤 Q3Y(K\ +~= j3U 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 R&$fWV;' y.s\MWvv>u 图2. RPC Photonics工程漫射体不同类型的散射数据 -wf>N: 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) m4yWhUi(o 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 9Q*:II 例如下所示: i52JY&N Sample name: EDF-C1-56 >UV}^OO Merging data from file EDF-C1-56 0-0.txt 4?bvJJuf) Finished merging RPC data for sample EDF-C1-56 >
6=3y4tP FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt z.+%{_pe 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Az-!X!O*f a. 创建一个新的散射库 ;/kmV~KG b. 散射模型命名 i g
. c. 改变散射模型为“Tabulated BSDF”. <;uM/vSi 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 ) oX'@,(6) 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。 +zXcTT[V 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, awjAv8tPO! g. 点击OK VDxF%!h( 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 P]OUzI, m&z(2yb1 ~N7;.
3 7 脚本代码: 0F.S[!I URt+MTU[ '#Language "WWB-COM" ;),,Hk r'lANl-v Option Explicit YK5(o KFN [_}8Vv&6 Sub Main G}LV"0? 0cVxP)J+ 'Cleanup _%23L| ClearOutputWindow() W}%"xy ]N ~Nf|,{[(5 Print "Merging RPC Photonics BSDF Data Files" JT=ax/%Mo SetTextColor(255,0,0) l ?YO!$ Print "Note: Script should be located in the same folder as the BSDF TXT files." rq Uk_|Xa Print "Note: Do not run this script multiple times without deleting the output file between executions." >3~)2)Q SetTextColor(0,0,0) 2m} bddS O%6D2d 'Current directory of this script (should be the same as the text files being merged) * dk(<g=fM Dim cDir As String "@|rU4Y cDir = MacroDir$ & "\" tOxH 9 B6KG\,'| 'Array which will be populated with the list of files to be merged 2$`Y 4b 3t Dim fList() As String, curFile As String ,}"jiGgS4 GetFileList( cDir, fList ) wp5H|ctl uu"hu||0_ Print "" 4tx6h<L#s Print "Files found for merging:" #!%zf{(C+ For Each curFile In fList [7g-M/jvY Print Chr(9) & curFile TCIbPsE Next ;*ULrX4[ wXKt)3dm u 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. MZB}O"
r Dim nameArray() As String, sampName As String ckv8QAm nameArray = Split(fList(0)," 0-0.txt") H
SGz- sampName = nameArray(0) s&<76kwl Print "" $<Y%4LI Print "Sample name: " & Chr(9) & sampName 3-)}.8F N8x.D-=gG 'Open an output file and write the FRED header data NV@$\< Dim outFile As String (<-m|H}; outFile = cDir & sampName & "_FRED.txt" g+c%J#F= Open outFile For Output As #1 wO`G_!W9 Print #1, "type bsdf_data" .+<Ka0 Print #1, "format angles=deg bsdf=value scale=1" n}fV$qu i}i>ho-8 'Loop the file list, skip the two header lines and write the remaining data to file <[K)PI Dim lineArray() As String, curLine As Long e@ $|xa") For Each curFile In fList 98 ]pkqp4 Print "Merging data from file " & curFile g W9`k,U ReadFile( cDir & curFile, lineArray ) U~t!
For curLine = 2 To UBound(lineArray) (0.JoeA`y Print #1, lineArray(curLine) bNiJ"k<pN Next 79-50}A Next 5J1a8RBR o^//|]H3Y 'Close the output file j]]5&u/l Close #1 o)x&|0_ >l/pwb@ Print "Finished merging RPC data for sample " & sampName J#t8xL Print "FRED formatted data file: " & Chr(9) & outFile $J,$_O6 End Sub n%iL+I "r3h+(5 'Utility function to read the contents of a file into an array of strings. ~l{Qz0& Function ReadFile(ByVal fileName As String, _ i~R+g3oi ByRef lineArray() As String) As Long m\bmBK"I m_BpY9c]5 ReadFile = -1 LU`) Dim oFSO As Object &-JIXVd*R Set oFSO = CreateObject("Scripting.FileSystemObject") -1`}|t; Erase lineArray 51H6
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XE%r Dim fid As Long q;IuV&B
If oFSO.fileexists( fileName ) Then V[kn'QkWv fid = FreeFile() ;l `Ufx Open fileName For Input As fid Wa.!eAe} lineArray = Split(Input(LOF(fid), fid), vbCrLf) *yo'Nqu Close fid a|#pl! End If P4c3kO0 Set oFSO = Nothing #o9CC)q5G Return UBound( lineArray ) :(tKc3z OYn5k6 End Function Qu7ML]e?z ^P/OHuDL Sub GetFileList( ByVal in_dir As String, _ rd$T6!I ByRef in_flist() As String ) -U?%A:,a| NLYf 'Redimension the file list array b9 li Erase in_flist "wKJ8 Cw kQhj? 'Tracks how many files are found _5O~]} Dim fCount As Long hNgT/y8 fCount = 0 x_?K6[G&} A&%7Z^Pp 'Recurse directory and search for text files .*>C[^ Dim f As String u|u)8;'9( f = Dir$(in_dir & "*.txt") ~|ZAS] While f <> "" 3pL4Zhf ReDim Preserve in_flist(fCount) M(C}2.20 in_flist(fCount) = f )hoVB fCount += 1 6"}F
KRR f = Dir$() gSyBoY Wend KM"?l<x0Y ReDim Preserve in_flist(fCount-1) i.?rom B4+u/hkbh? End Sub Nlwt}7
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