[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： qKNX^n;  
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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。 r!:W-Y%&#  
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背景： |W4 \  
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。 0goKiPx  
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。  O_^O1  
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步骤 U'(}emh}  
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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。 B w?Kb@  
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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） k.=67L  
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 /^ *GoB  
例如下所示： e[
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Sample name:  EDF-C1-56 7.g)_W{7}  
Merging data from file EDF-C1-56 0-0.txt 7oaa)  
Finished merging RPC data for sample EDF-C1-56 y Nb&;E7 H  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt %.^8&4$+  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 eLE9-K+  
a. 创建一个新的散射库 tKg\qbY&
 
b. 散射模型命名 DwM4/m  
c. 改变散射模型为“Tabulated BSDF”. L(tS]yWHw  
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 ） NCbl|v=  
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。 FD>j\  
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， w20E]4"  
g. 点击OK ;m6Mm`[i
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5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 kB_uU !G  
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脚本代码： obWBX'  
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'#Language "WWB-COM" L-ans2?  
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Option Explicit V"":_`1VW  
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Sub Main sX53(|?*  
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    'Cleanup 7+]T}4;  
    ClearOutputWindow() N}{CL(xi  
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    Print "Merging RPC Photonics BSDF Data Files" &We1i&w  
    SetTextColor(255,0,0) Q]X0O10  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." x" 2
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    Print "Note: Do not run this script multiple times without deleting the output file between executions." f:
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    SetTextColor(0,0,0) -f?Rr:#  
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    'Current directory of this script (should be the same as the text files being merged) ,Yhy7w  
    Dim cDir As String bqY}t. Y&"  
    cDir = MacroDir$ & "\" INwc@XB  
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    'Array which will be populated with the list of files to be merged /Z<"6g?  
    Dim fList() As String, curFile As String JtYc'%OF  
    GetFileList( cDir, fList ) 
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    Print "" ]e+IaZ[Wo  
    Print "Files found for merging:" {#M=gDhbX  
    For Each curFile In fList #u+BjuZo  
        Print Chr(9) & curFile L^PZ\OC  
    Next  I0ycLx  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 3}O.B r|  
    Dim nameArray() As String, sampName As String rC]jz$sle  
    nameArray = Split(fList(0)," 0-0.txt") Cnf;5/  
    sampName  = nameArray(0) bu"Jb4_a>  
    Print "" 2cfzLW(  
    Print "Sample name: " & Chr(9) & sampName }i_[wq{E&  
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    'Open an output file and write the FRED header data ixN>KwH  
    Dim outFile As String Q6?+#}  
    outFile = cDir & sampName & "_FRED.txt" b!hxx Z  
    Open outFile For Output As #1 uE:#m.Q  
    Print #1, "type bsdf_data" ;@K,>$ur-  
    Print #1, "format angles=deg bsdf=value scale=1" {y0
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    'Loop the file list, skip the two header lines and write the remaining data to file EVmQ"PKL'  
    Dim lineArray() As String, curLine As Long K/oPfD]  
    For Each curFile In fList R7T"fN  
        Print "Merging data from file " & curFile %_+9y??  
        ReadFile( cDir & curFile, lineArray ) 1DcYc-k#  
        For curLine = 2 To UBound(lineArray) FM9b0qE  
            Print #1, lineArray(curLine) >>krH'79  
        Next &:L8; m  
    Next sBp|Lo  
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    'Close the output file `g%]z@'+?  
    Close #1 H^"BK
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    Print "Finished merging RPC data for sample " & sampName GSV,  
    Print "FRED formatted data file: " & Chr(9) & outFile eG# (9  
End Sub Sw#Ez-X  
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'Utility function to read the contents of a file into an array of strings. _5M!ec  
Function ReadFile(ByVal fileName As String, _ ;3\Fb3d  
                  ByRef lineArray() As String) As Long &dvJg  
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    ReadFile = -1 ` 2|~Z H  
    Dim oFSO As Object 6 6x} |7  
    Set oFSO = CreateObject("Scripting.FileSystemObject") uW;Uq=UN  
    Erase lineArray /@FB;`'  
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    Dim fid As Long nL^6{I~  
    If oFSO.fileexists( fileName ) Then vJGxD\h  
        fid = FreeFile() i#lvt#2J0  
        Open fileName For Input As fid PGT!HdX#{  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) SrK;b .  
        Close fid L3q)j\ls  
    End If e^~t52]  
    Set oFSO = Nothing 9 )B>|#\  
    Return UBound( lineArray ) BO[Q"g$Kon  
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End Function l@1f L%f  
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Sub GetFileList( ByVal in_dir As String, _ *sJx0<!M}  
                 ByRef in_flist() As String ) pRc(>P3;  
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    'Redimension the file list array r_)-NOp  
    Erase in_flist mm#U a/~1u  
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    'Tracks how many files are found a-!"m

  
    Dim fCount As Long Kox~k?JK  
    fCount = 0 i04Sf^  
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    'Recurse directory and search for text files 2l5@gDk5  
    Dim f As String @{I55EQ]  
    f = Dir$(in_dir & "*.txt") .U5+PQN  
    While f <> "" ^0{S!fs  
        ReDim Preserve in_flist(fCount) ?2EzNNcS  
        in_flist(fCount) = f 
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        fCount += 1 V<4)'UI?k9  
        f = Dir$() 'Iyk`=R  
    Wend vA`[#(C  
    ReDim Preserve in_flist(fCount-1) mSQ!<1PM  
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End Sub ;t?pyFT2Z