[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： ar__ Pf6r  
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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。 <0b)YJb4M  
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背景： ,?>s>bHV  
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。 8K:y
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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。 * @ 3Ag(  
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步骤 TE3lK(f  
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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。 ]^h]t~  
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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） [<n2Uz7MP  
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 $xzAv{  
例如下所示：
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Sample name:  EDF-C1-56 8aK)#tNWN  
Merging data from file EDF-C1-56 0-0.txt yA)/Q Yge  
Finished merging RPC data for sample EDF-C1-56 ZP@ $Q%up  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt &dqLP95  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 EMY/~bQW  
a. 创建一个新的散射库 (SpX w,:  
b. 散射模型命名 z* ^_)Z  
c. 改变散射模型为“Tabulated BSDF”. R%{<mno/_  
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 ） ~xkeuU  
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。 l3Xfc2~ 2  
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， cqQ#p2<%  
g. 点击OK ZGexdc%  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 HVi'eNgo  
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脚本代码： |:nn>E}ZA/  
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'#Language "WWB-COM" gH12[Us'`  
q ?|,O;?  
Option Explicit YWe{juXSw  
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Sub Main -.1y(k^4E  
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    'Cleanup `F-/QX[:  
    ClearOutputWindow() J?V?R  
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    Print "Merging RPC Photonics BSDF Data Files" v[ .cd*b  
    SetTextColor(255,0,0) h{%nC>m;  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." /KFfU1
 
    Print "Note: Do not run this script multiple times without deleting the output file between executions." nEJq_  
    SetTextColor(0,0,0) V3&RJ k=b  
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    'Current directory of this script (should be the same as the text files being merged) k Z?=AXu  
    Dim cDir As String &TUWW/?T  
    cDir = MacroDir$ & "\" NSxoF3  
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    'Array which will be populated with the list of files to be merged `.E[}W
  
    Dim fList() As String, curFile As String HJ9Kz^TnC  
    GetFileList( cDir, fList ) *w
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    Print "" Z/W:97M  
    Print "Files found for merging:" HHA<IZ#;,  
    For Each curFile In fList o)h_H;  
        Print Chr(9) & curFile CuFSeRe  
    Next {&cJDqz5=  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Yrb{ByO&  
    Dim nameArray() As String, sampName As String  DGRXd#  
    nameArray = Split(fList(0)," 0-0.txt") *QpMF/<?  
    sampName  = nameArray(0) b,5~b&<h  
    Print "" y`VyQWW  
    Print "Sample name: " & Chr(9) & sampName vq0Vq(V=  
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    'Open an output file and write the FRED header data R_ B7EP  
    Dim outFile As String T5R-B=YWu  
    outFile = cDir & sampName & "_FRED.txt" *F+KqZ.2  
    Open outFile For Output As #1 -f3p U:G8  
    Print #1, "type bsdf_data" Xe
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    Print #1, "format angles=deg bsdf=value scale=1" Tl%`P_J)-S  
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    'Loop the file list, skip the two header lines and write the remaining data to file IshKH-  
    Dim lineArray() As String, curLine As Long ,
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    For Each curFile In fList E-4b[xNj*+  
        Print "Merging data from file " & curFile i5en*)O8  
        ReadFile( cDir & curFile, lineArray ) @D.}\(  
        For curLine = 2 To UBound(lineArray) Sxnpq Vbk  
            Print #1, lineArray(curLine) xR-%L  
        Next cA2V2S)  
    Next n D0K).=Q  
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    'Close the output file o\[~.";Z  
    Close #1 aAZZ8V  
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    Print "Finished merging RPC data for sample " & sampName '<jyw   
    Print "FRED formatted data file: " & Chr(9) & outFile ;%B(_c  
End Sub cbNTj$'b2u  
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'Utility function to read the contents of a file into an array of strings. Umz KY  
Function ReadFile(ByVal fileName As String, _ AV:hBoO  
                  ByRef lineArray() As String) As Long {}>0e:51  
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    ReadFile = -1 i
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    Dim oFSO As Object D|lzGt  
    Set oFSO = CreateObject("Scripting.FileSystemObject") j:^#rFD4?  
    Erase lineArray s28`OKC}  
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    Dim fid As Long +dWDxguE{w  
    If oFSO.fileexists( fileName ) Then &Q%zl9g(g  
        fid = FreeFile() BTlk Etm  
        Open fileName For Input As fid F<ZYh  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) c%^7!FSg  
        Close fid |Z|-q"Rf  
    End If hP=WFD&  
    Set oFSO = Nothing I.WvLLK2  
    Return UBound( lineArray ) /vY(o1o x  
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End Function aB*Bz]5;E  
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Sub GetFileList( ByVal in_dir As String, _ m-%E-nr  
                 ByRef in_flist() As String ) <>n0arAn  
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    'Redimension the file list array 6 +Sxr  
    Erase in_flist mH54ja2  
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    'Tracks how many files are found N@;?CKU  
    Dim fCount As Long \n"{qfn`r  
    fCount = 0 y>R=`A1b  
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    'Recurse directory and search for text files pe0F0Ruy
 
    Dim f As String HpR]q05d  
    f = Dir$(in_dir & "*.txt") ;5wn67'  
    While f <> "" f"B3,6m  
        ReDim Preserve in_flist(fCount) R]Vt Y7}i,  
        in_flist(fCount) = f WKQ^NEqr3  
        fCount += 1 cec9l65d  
        f = Dir$() yID16
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    Wend Zvhsyz|  
    ReDim Preserve in_flist(fCount-1) tN[L@t9#cr  
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End Sub !*/*
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