RPC Photonics扩散片BSDF
摘要: >EacXPt-O H}ie D"T_ 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。 6k4ZzQ} @k|V4 背景: @zQ.d{ 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。 MAv-`8@| 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。 ' F,.y6QU
图1. RPC Photonics工程漫射体结构及光束投射形状 pW
y+oZ [|5gw3y cs-wqxTX[$ 步骤 UPE9e
=x &"aF1 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。 6d# 7 P(Gv|Q@
图2. RPC Photonics工程漫射体不同类型的散射数据 \dx$G?R 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) @ P'("qb~ 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 7o99@K, 例如下所示: oe4r_EkYwW Sample name: EDF-C1-56 6T`F'Fk[ Merging data from file EDF-C1-56 0-0.txt 1ZrJ7a7= Finished merging RPC data for sample EDF-C1-56 i".nnAI: FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 5#WyI#YNG 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 KUE}^/%z a. 创建一个新的散射库 "p"M9P' b. 散射模型命名 3*v&6/K c. 改变散射模型为“Tabulated BSDF”. crDm2oA~t d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) [(O*W e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 EqYBT f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, ((AsZ$[S g. 点击OK cns~)j~ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 _rN1(=J b}-/~l-: xQ]^wT.Q 脚本代码: -50Nd=1 )q8!:Z '#Language "WWB-COM" o4U[;.?c s?9$o
Qq1 Option Explicit Qt~QJJN?oF =qNZ7>Qw Sub Main (Qp53g {L#+v~d^'n 'Cleanup !RPPwvNk4 ClearOutputWindow() !A|ayYBb\ NDo>"in Print "Merging RPC Photonics BSDF Data Files" P.t0o~hoK; SetTextColor(255,0,0) hgU#2`fS Print "Note: Script should be located in the same folder as the BSDF TXT files." aGx[?}= Print "Note: Do not run this script multiple times without deleting the output file between executions." z]V%&f SetTextColor(0,0,0) ]nQC qrLE1b 1$ 'Current directory of this script (should be the same as the text files being merged) V|q`KOF Dim cDir As String ,UA-Pq3} cDir = MacroDir$ & "\" uJ:SN; G,-x+e" 'Array which will be populated with the list of files to be merged gwQk
M4 Dim fList() As String, curFile As String p+y2w{{ GetFileList( cDir, fList ) _yu_Ev}R abczW[\ Print "" WWtksi, Print "Files found for merging:" M!#[(: For Each curFile In fList TPi=!*$& Print Chr(9) & curFile :&-j{8p- Next |K11Woii 6<`tb)_2~ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. wF.S ,| Dim nameArray() As String, sampName As String NNTUl$ nameArray = Split(fList(0)," 0-0.txt") {[tx^b sampName = nameArray(0) IPxK$nI^ Print "" `/+PZqdC Print "Sample name: " & Chr(9) & sampName .CAcG"42 G@+AB*Eu 'Open an output file and write the FRED header data F8En)# Dim outFile As String cq,8^o& outFile = cDir & sampName & "_FRED.txt" us2RW<Oxv Open outFile For Output As #1 :WM[[LOaC Print #1, "type bsdf_data" .G/2CVMj Print #1, "format angles=deg bsdf=value scale=1" /)LI1\o o8h1 'Loop the file list, skip the two header lines and write the remaining data to file ,2/y(JX}*! Dim lineArray() As String, curLine As Long iI@m e= For Each curFile In fList lE 09 Y Print "Merging data from file " & curFile t9Y?0O}/ ReadFile( cDir & curFile, lineArray ) a?gziCmS?C For curLine = 2 To UBound(lineArray) TD"w@jBA Print #1, lineArray(curLine) Y?b4* me Next <7X6ULQ Next ,K 1X/), +1(L5Do} 'Close the output file mq!_/3 Close #1 xZ.c@u6: f !D~aJ Print "Finished merging RPC data for sample " & sampName r!WXD9# Print "FRED formatted data file: " & Chr(9) & outFile X{-[
E^X End Sub $9In\x
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} 'Utility function to read the contents of a file into an array of strings. - )brq3L Function ReadFile(ByVal fileName As String, _ /'WIgP ByRef lineArray() As String) As Long P{{U *j/[5J0'M ReadFile = -1 |d0,54! Dim oFSO As Object l We1Q# Set oFSO = CreateObject("Scripting.FileSystemObject") +~] :oj Erase lineArray "<LVA2v; pQ/
bIuq Dim fid As Long C?47v4n-' If oFSO.fileexists( fileName ) Then TLC&@o
: fid = FreeFile() M>kk"tyM Open fileName For Input As fid Rb=8(# lineArray = Split(Input(LOF(fid), fid), vbCrLf) @!MhVNS_< Close fid VfON{ 1g End If ;+W9EbY2 Set oFSO = Nothing @ApX43U( Return UBound( lineArray ) @2eV^eO9 'D1Sm&M2%e End Function U2@Mxw 4Bc< Sub GetFileList( ByVal in_dir As String, _ kV$$GLD\ ByRef in_flist() As String ) SGUu\yS&s @cT= t0* 'Redimension the file list array [WxRwE Erase in_flist `E4OgO '
+*,|;? 'Tracks how many files are found bo%v( Dim fCount As Long ( /): fCount = 0 Ag#o&Y \'AS@L"Wj^ 'Recurse directory and search for text files v*UJ4r Dim f As String RxZ#`$F f = Dir$(in_dir & "*.txt") SF#Rc>v While f <> "" YR$)yl ReDim Preserve in_flist(fCount) u>U4w68 in_flist(fCount) = f |DZ3=eWZ fCount += 1 E
02l=M f = Dir$() ! !9l@ Wend f} _d`?K ReDim Preserve in_flist(fCount-1) v7kR]HU[y tq^d1b(j4 End Sub vs|_l!n3
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