[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： ]a\HgFp@  
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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。 P\.1w>X  
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背景： )cxML<j'  
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。
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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。 `xu/|})KI  
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步骤 qeoj
  
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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。 O.wk
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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） kI#yW!  
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 Z/=HQ8  
例如下所示： |[ ,|S{  
Sample name:  EDF-C1-56 atjrn:X  
Merging data from file EDF-C1-56 0-0.txt Ed&M  
Finished merging RPC data for sample EDF-C1-56 ^[-3qi  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt J
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4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 /? HLEX  
a. 创建一个新的散射库
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b. 散射模型命名 <LOas$
 
c. 改变散射模型为“Tabulated BSDF”. NW@guhK.  
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 ） )l*6zn`z  
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。 >-<7 r?~  
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， +#0,2wR#  
g. 点击OK 'P<T,:z?  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 :TN^}RML  
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脚本代码： A]"IQ-  
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'#Language "WWB-COM" jCv%[H7  
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Option Explicit G[!Y6c3  
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Sub Main {pW(@4U  
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    'Cleanup S)[$F}  
    ClearOutputWindow() k->cqtG  
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    Print "Merging RPC Photonics BSDF Data Files" - d(RK_  
    SetTextColor(255,0,0) ;NeN2|I]  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." X7gtR|[  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." gw);b)&mx  
    SetTextColor(0,0,0) b(.,Ex]  
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    'Current directory of this script (should be the same as the text files being merged) b".e6zev  
    Dim cDir As String X[up$<  
    cDir = MacroDir$ & "\" `jyBF  
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    'Array which will be populated with the list of files to be merged -v7O*xm"  
    Dim fList() As String, curFile As String }c~o3t(7`b  
    GetFileList( cDir, fList ) v&i,}p^M5  
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    Print "" 5Myp#!|x:  
    Print "Files found for merging:" 51lN,VVD  
    For Each curFile In fList *yxn*B_xZ  
        Print Chr(9) & curFile $9Yk]~  
    Next ($ l t@j  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. J|A:C[7 2  
    Dim nameArray() As String, sampName As String 2gnmk TyF  
    nameArray = Split(fList(0)," 0-0.txt") ;_vo2zl1  
    sampName  = nameArray(0) *(sUz?t  
    Print "" f~NGIlgR  
    Print "Sample name: " & Chr(9) & sampName nm597WeZp  
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    'Open an output file and write the FRED header data wkwsBi  
    Dim outFile As String ^E3i]Oem  
    outFile = cDir & sampName & "_FRED.txt" zU1[+JJY"{  
    Open outFile For Output As #1 Hkck=@>8H*  
    Print #1, "type bsdf_data" n!K<g.tjW  
    Print #1, "format angles=deg bsdf=value scale=1"  H*]B7?S  
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    'Loop the file list, skip the two header lines and write the remaining data to file IT\lkF2  
    Dim lineArray() As String, curLine As Long ?g21U97Q  
    For Each curFile In fList <(U:v  
        Print "Merging data from file " & curFile ;=[~2*8  
        ReadFile( cDir & curFile, lineArray ) wUbs9y<  
        For curLine = 2 To UBound(lineArray) *?GV(/Q  
            Print #1, lineArray(curLine) $WV N4fg  
        Next fq2t^c|$  
    Next zz1e)W/  
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    'Close the output file Fl'+ C   
    Close #1 LT ZoO9O  
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    Print "Finished merging RPC data for sample " & sampName 1hQeuG  
    Print "FRED formatted data file: " & Chr(9) & outFile a8Q=_4 l  
End Sub &XnbZ&_  
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'Utility function to read the contents of a file into an array of strings. /v,H%8S  
Function ReadFile(ByVal fileName As String, _ `1
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                  ByRef lineArray() As String) As Long $Jt+>.44  
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    ReadFile = -1 `V1D&}H+G  
    Dim oFSO As Object uS%Y$v  
    Set oFSO = CreateObject("Scripting.FileSystemObject") |rDv!m  
    Erase lineArray B.-1wZl  

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    Dim fid As Long %j3*j  
    If oFSO.fileexists( fileName ) Then lQolE P.pc  
        fid = FreeFile() #l!Sz247  
        Open fileName For Input As fid x3JX}yCX  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) )fo9Qwe  
        Close fid C)r!;u)AZH  
    End If &!lGx7zf  
    Set oFSO = Nothing %0z&k!P  
    Return UBound( lineArray ) >%~%O`+  
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End Function xgi/,Nk '  
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Sub GetFileList( ByVal in_dir As String, _ Wy2 pa #Q  
                 ByRef in_flist() As String ) b@yGa%Gz@  
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    'Redimension the file list array PV*U4aP  
    Erase in_flist )9L:^i6  
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    'Tracks how many files are found -}B&>w,5  
    Dim fCount As Long =vv4;az X  
    fCount = 0 j5,vSh~q;'  
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    'Recurse directory and search for text files Ri}n0}I  
    Dim f As String XL/?v" /  
    f = Dir$(in_dir & "*.txt") k|^e=I   
    While f <> "" MMMuT^X  
        ReDim Preserve in_flist(fCount) d8|bO#a%9  
        in_flist(fCount) = f z4snH%q  
        fCount += 1 .."=  
        f = Dir$() , 8NY<sFh  
    Wend a|*{BlY  
    ReDim Preserve in_flist(fCount-1) )>]~Y  
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End Sub 1Qi5t?{