[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： q5L^>"  
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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。 {=?(v`88  
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背景： _ilitwRN3  
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。 (ie%zrhS  
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。 #{{p4/:  
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步骤 CoNaGb  
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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。 ]K*R[  
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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） |bnYHP$!  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 oKCy,Ot<  
例如下所示： q(:L8nKT]  
Sample name:  EDF-C1-56 GT)7VFrL  
Merging data from file EDF-C1-56 0-0.txt Z#-N$%^F  
Finished merging RPC data for sample EDF-C1-56 [}ja\!P  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt (lV
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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 77yYdil^W+  
a. 创建一个新的散射库 NytTyk)  
b. 散射模型命名 y|KQ`;  
c. 改变散射模型为“Tabulated BSDF”. R"V90bCf  
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 ） zMu9A|  
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。 2Kz$y JTp  
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， DE?k|Get2  
g. 点击OK GT6i9*tb#  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值
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脚本代码： (0b\%;}  
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'#Language "WWB-COM" < $e#o H  
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Option Explicit ufIv
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Sub Main [)s4:V  
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    'Cleanup 5l1R")0`t_  
    ClearOutputWindow() T?m@`"L,  
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    Print "Merging RPC Photonics BSDF Data Files" '(3 QyCD  
    SetTextColor(255,0,0) eG!ma`v  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." } SWp~3P  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." IiqqdU]  
    SetTextColor(0,0,0) 5%WAnh  
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    'Current directory of this script (should be the same as the text files being merged) 1L4-;HYJm  
    Dim cDir As String b)Da6fp  
    cDir = MacroDir$ & "\" #<b\BqYG  
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    'Array which will be populated with the list of files to be merged */aQ+%>jf  
    Dim fList() As String, curFile As String G&^8)S@1  
    GetFileList( cDir, fList ) (9I(e^@]  
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    Print "" $.4A?,d  
    Print "Files found for merging:" n4S`k%CI  
    For Each curFile In fList zgEN2d  
        Print Chr(9) & curFile >"bW'  
    Next wrgB =o  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. \^"Vqx  
    Dim nameArray() As String, sampName As String c.Sd~k:3  
    nameArray = Split(fList(0)," 0-0.txt") V
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    sampName  = nameArray(0) c.Hw K\IU  
    Print "" 0H>gMXWE]  
    Print "Sample name: " & Chr(9) & sampName lr~ |=}^  
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    'Open an output file and write the FRED header data ~:7y!=8#  
    Dim outFile As String {24>&
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    outFile = cDir & sampName & "_FRED.txt" 0l[52eZ/  
    Open outFile For Output As #1 A1+:y,wXs  
    Print #1, "type bsdf_data" ; >H1A  
    Print #1, "format angles=deg bsdf=value scale=1" -#9e
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    'Loop the file list, skip the two header lines and write the remaining data to file I*.nwV<  
    Dim lineArray() As String, curLine As Long _|I8+(~)  
    For Each curFile In fList 4%~*}  
        Print "Merging data from file " & curFile we`BqZV  
        ReadFile( cDir & curFile, lineArray ) LJ~#0Zu?  
        For curLine = 2 To UBound(lineArray) lb't
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            Print #1, lineArray(curLine) '[liZCg  
        Next a)pc+w#  
    Next 07:V[@'  
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    'Close the output file w6!97x  
    Close #1 ?K7uy5Y  
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    Print "Finished merging RPC data for sample " & sampName z8t;jw  
    Print "FRED formatted data file: " & Chr(9) & outFile JK<[]>O  
End Sub rHw#<oV  
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'Utility function to read the contents of a file into an array of strings. k*N!U[]  
Function ReadFile(ByVal fileName As String, _ Dch\k<Te  
                  ByRef lineArray() As String) As Long uOzoE_i
 
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    ReadFile = -1 p%mHxYP  
    Dim oFSO As Object p=nbsS~":  
    Set oFSO = CreateObject("Scripting.FileSystemObject") K:'^f? P  
    Erase lineArray K9Mz4K_  
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    Dim fid As Long 6ScB:8M  
    If oFSO.fileexists( fileName ) Then } uS0N$4  
        fid = FreeFile() Og%Y._  
        Open fileName For Input As fid 1!.-/  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) $L0sBW&  
        Close fid 7BU7sQjs  
    End If tWy.Gz\  
    Set oFSO = Nothing EB!ne)X  
    Return UBound( lineArray ) xD&n'M]  
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End Function 1xS+r)_n@  
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Sub GetFileList( ByVal in_dir As String, _ _?O'A"  
                 ByRef in_flist() As String ) i#b/.oa  
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    'Redimension the file list array u@e.5_:S)  
    Erase in_flist gC2}?nq*  
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    'Tracks how many files are found s$pXn&:  
    Dim fCount As Long ~|S0E:*.  
    fCount = 0 9F[3B`w  
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    'Recurse directory and search for text files _-({MX[3k<  
    Dim f As String Ph""[0n%o  
    f = Dir$(in_dir & "*.txt") 082iEG  
    While f <> "" {DP9^hg  
        ReDim Preserve in_flist(fCount)  ,==_u  
        in_flist(fCount) = f -W^{)%4g
 
        fCount += 1 =QVkY7  
        f = Dir$() 'u v=D  
    Wend
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    ReDim Preserve in_flist(fCount-1) &P9fM-]b s  
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End Sub j H2)8~P