RPC Photonics扩散片BSDF
摘要: g|P hNo FMn&2fH 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。 !r|X6`g z)%1 i 背景: (yP55PC
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。 @I&"P:E0F; 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。 .*j+?
图1. RPC Photonics工程漫射体结构及光束投射形状 AV p[gr oo!g?X[[ }$-VI\96 步骤 {9Y'v $<v_Vm?6d 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。
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图2. RPC Photonics工程漫射体不同类型的散射数据 f2wW2]Fg 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) Bu1z$#AC 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 K\b O[J 例如下所示: />C~a]} Sample name: EDF-C1-56 ]lUu%<-; Merging data from file EDF-C1-56 0-0.txt -e~Uu Finished merging RPC data for sample EDF-C1-56 "b
0cj FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt hptuTBD 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 q3F5\6aN a. 创建一个新的散射库 N-gRfra+8L b. 散射模型命名 C~qhwwh c. 改变散射模型为“Tabulated BSDF”. C t)MvZ 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 ) ?^~"x.<nr 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。 ~8*oGG~s 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, 7g)3\C g. 点击OK $hSZ@w|IF 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 `VtwKt* $]kg_l) %z~U@Mka 脚本代码: ozC!q)j n5.>;N.* '#Language "WWB-COM"
#-T.@a1X 1v&Fo2ML Option Explicit `fZD%o3l aLi_Hrb9 Sub Main .gGvyscdH; |A0$XU{ 'Cleanup ht)nx,e= ClearOutputWindow() -vHr1I< N@6OQ:,[F Print "Merging RPC Photonics BSDF Data Files" P/Kit?kngS SetTextColor(255,0,0) R*Z] Print "Note: Script should be located in the same folder as the BSDF TXT files." m> (h_j Print "Note: Do not run this script multiple times without deleting the output file between executions." iIaT1i4t. SetTextColor(0,0,0) {X<4wxeTo ( 'n8=J 'Current directory of this script (should be the same as the text files being merged) WEtA4zCO Dim cDir As String ]<gCq/V # cDir = MacroDir$ & "\" V<4+g/ HhmVV"g 'Array which will be populated with the list of files to be merged _AYC|R| Dim fList() As String, curFile As String eJw=" GetFileList( cDir, fList ) uxyTu2L7 GWhAjL/N Print "" *xg`Kwl5Kl Print "Files found for merging:" ,|X+/|gm For Each curFile In fList :KSor}t Print Chr(9) & curFile u\R`IZ&O Next neh;`7~5@K +'/}[1q1/T 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. d:hL
)x Dim nameArray() As String, sampName As String 8i;)|z7 nameArray = Split(fList(0)," 0-0.txt") VtO;UN sampName = nameArray(0) 2l@"p!ar= Print "" yv)nW::D( Print "Sample name: " & Chr(9) & sampName 0sDwTb" vA"niO 'Open an output file and write the FRED header data ^2^|AXNES Dim outFile As String u:$x6/t outFile = cDir & sampName & "_FRED.txt" 030U7 VT1 Open outFile For Output As #1 B>Cs&}Y! Print #1, "type bsdf_data" pp]_/46nN Print #1, "format angles=deg bsdf=value scale=1" b"M`@';+ s`=/fvf. 'Loop the file list, skip the two header lines and write the remaining data to file r1ok u0 o Dim lineArray() As String, curLine As Long b"nG-0JR For Each curFile In fList oU0
h3 Print "Merging data from file " & curFile Pc)VK>.fc ReadFile( cDir & curFile, lineArray ) 8b:clvh For curLine = 2 To UBound(lineArray) pAil]f6 Print #1, lineArray(curLine) *)bd1B# Next 3`k[!! Next rjL?eTU"s +K;Y+
K&;2 'Close the output file 5U{4TeUH Close #1 v0`qMBr1y px_s@>l` Print "Finished merging RPC data for sample " & sampName W&e'3gk _ Print "FRED formatted data file: " & Chr(9) & outFile iog #
, End Sub 4e@&QOo`Cu .vN%UNu 'Utility function to read the contents of a file into an array of strings. t0e{|du Function ReadFile(ByVal fileName As String, _ [Iw>|q<e ByRef lineArray() As String) As Long |,;twj[?4 O:;OR'N9 ReadFile = -1 [O7w = Dim oFSO As Object >X[|c"l. Set oFSO = CreateObject("Scripting.FileSystemObject") NTm<6Is` Erase lineArray 3+(yI 4 K[uY+!'1 Dim fid As Long u3Usq=Ij{ If oFSO.fileexists( fileName ) Then "mPSA Z fid = FreeFile() WVS$O99Y Open fileName For Input As fid s]y-pZ lineArray = Split(Input(LOF(fid), fid), vbCrLf) %'L].+$t Close fid %1\v7Xw{9 End If 894r;UA7 Set oFSO = Nothing Cf0|Z Return UBound( lineArray ) _BG8/"h32 x0\e<x9s End Function (;0$i?3\ -ca7x`yo Sub GetFileList( ByVal in_dir As String, _ |*^8~u3J" ByRef in_flist() As String ) 4l lD6&% /"""z=q 'Redimension the file list array =oE_.ux\ Erase in_flist ^W
Y8-6 |XKOXa3. 'Tracks how many files are found :7p9t.R<$h Dim fCount As Long x37/cu fCount = 0 7hB#x]oQo j)jCu ;` 'Recurse directory and search for text files "jL1.9%" Dim f As String q&zny2]) f = Dir$(in_dir & "*.txt") vv+TKO While f <> "" AL>c:K)qO ReDim Preserve in_flist(fCount) P<%v+O in_flist(fCount) = f /8xH$n&xoC fCount += 1 ;>NP.pnA) f = Dir$() X*pZNz&E Wend tT;8r8@ ReDim Preserve in_flist(fCount-1) SQ}S4r oW0gU?Rr)u End Sub pw@`}cM= [6AHaOhR' r5o@+"! QQ:2987619807 -=>sTMWpr
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