[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： XX~,>Q}H=  
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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。 xN(|A}w  
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背景： 3uMy]HUQ  
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 mM_H;-X  
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。 ']oQ]Yx0  
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步骤 %>s|j'{  
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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。 A)KZa
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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） xLn%hxm?,  
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 9>$p  
例如下所示： v8DC21pb  
Sample name:  EDF-C1-56 /7LR;>Bj  
Merging data from file EDF-C1-56 0-0.txt O'~+_ykTl  
Finished merging RPC data for sample EDF-C1-56 LHmZxi?  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt SY8C4vb'h  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 u
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a. 创建一个新的散射库 6zn5UW#q  
b. 散射模型命名 $]8Q(/mbK  
c. 改变散射模型为“Tabulated BSDF”. J-4:H gx  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） jq-_4}w?C  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 3N:D6
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f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， iR0y"Cii  
g. 点击OK Qei"'~1a  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 )_NO4`ejs/  
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脚本代码： WjjB<YKzF  
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'#Language "WWB-COM" 0?M:6zf_iv  
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Option Explicit -{+}@?  
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Sub Main |WUG}G")*x  
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    'Cleanup [1KuzCcK}  
    ClearOutputWindow() v9UD%@tZ  
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    Print "Merging RPC Photonics BSDF Data Files" -!9G0h&i|  
    SetTextColor(255,0,0) FCn_^l)EA  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 6`-jPR  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." w`=\5Oa.G  
    SetTextColor(0,0,0) 2Hv+W-6v  
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    'Current directory of this script (should be the same as the text files being merged) 8sCv]|cn  
    Dim cDir As String <Ok3FE.K  
    cDir = MacroDir$ & "\" +'w3 =2Bo  
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    'Array which will be populated with the list of files to be merged Hq 188<  
    Dim fList() As String, curFile As String "g#i'"qnW  
    GetFileList( cDir, fList ) <d_!mKw  
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    Print "" ;({W#Wa  
    Print "Files found for merging:" ?pZOeqqu$  
    For Each curFile In fList 40<mrVl  
        Print Chr(9) & curFile y^%y<~f
 
    Next >dG[G>  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. alvrh'51  
    Dim nameArray() As String, sampName As String
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    nameArray = Split(fList(0)," 0-0.txt")
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    sampName  = nameArray(0) JO<wU  
    Print "" i7>tU=  
    Print "Sample name: " & Chr(9) & sampName IN G@B#Cl  
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    'Open an output file and write the FRED header data t<viX's  
    Dim outFile As String ?S$P
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    outFile = cDir & sampName & "_FRED.txt" I 2|Bg,e  
    Open outFile For Output As #1 @{O`E^}-D  
    Print #1, "type bsdf_data" E\,
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    Print #1, "format angles=deg bsdf=value scale=1" :4%k9BGAj"  
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    'Loop the file list, skip the two header lines and write the remaining data to file LE>]8[f6S  
    Dim lineArray() As String, curLine As Long ^ovR7+V  
    For Each curFile In fList ]P?vdgEM&  
        Print "Merging data from file " & curFile (ICd}  
        ReadFile( cDir & curFile, lineArray ) ,WB{i^TD  
        For curLine = 2 To UBound(lineArray) iW /}#  
            Print #1, lineArray(curLine) cjIh}:|'  
        Next Oo%d]8W  
    Next 1 Ya`| ?FS  
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    'Close the output file 46&/gehr  
    Close #1 1PV'?tXp(  
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    Print "Finished merging RPC data for sample " & sampName >s?S+W[L  
    Print "FRED formatted data file: " & Chr(9) & outFile `lt"[K<  
End Sub 2V;PYI  
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'Utility function to read the contents of a file into an array of strings. -pXSSa;O9  
Function ReadFile(ByVal fileName As String, _ V% 6I\G2/:  
                  ByRef lineArray() As String) As Long KNIn:K^/  
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    ReadFile = -1 }d}Ke_Q0  
    Dim oFSO As Object "5wa91*  
    Set oFSO = CreateObject("Scripting.FileSystemObject")  O+Y6N  
    Erase lineArray u($!z^h  
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    Dim fid As Long psMvq@>  
    If oFSO.fileexists( fileName ) Then Y\?"WGL)p  
        fid = FreeFile() `,TzQ  
        Open fileName For Input As fid "mvt>X  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) (rm?jDm   
        Close fid JB[~;nLlC  
    End If EGF '"L  
    Set oFSO = Nothing \Et3|Iv  
    Return UBound( lineArray ) o!ebs0  
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End Function e [mm  
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Sub GetFileList( ByVal in_dir As String, _ S2G
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                 ByRef in_flist() As String ) !\.pq 2  
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    'Redimension the file list array GH:jH]u!V  
    Erase in_flist S8j{V5R'  
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    'Tracks how many files are found nwRc%C``UK  
    Dim fCount As Long qm8B8&-  
    fCount = 0 U7}yi$WT  
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    'Recurse directory and search for text files hAnPXiD  
    Dim f As String G.abql  
    f = Dir$(in_dir & "*.txt") l$pm_%@2]  
    While f <> "" mQ26K~  
        ReDim Preserve in_flist(fCount) UJ7*j%XQz_  
        in_flist(fCount) = f EC!02S  
        fCount += 1 |AU~_{H  
        f = Dir$() k],Q9  
    Wend HjD8u`qQ  
    ReDim Preserve in_flist(fCount-1) _ y8Wn}19f  
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End Sub BdblLUGK#