[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： ])x1MmRg\  
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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。 !QUY (  
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背景： T5BZD +Ta  
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。 ^S9y7b^;r  
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。 l.[pnLD  
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步骤 da{]B5p\  
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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。 2EY"[xK|  
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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） -wlj;U  
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 l?Y^3x}j  
例如下所示： j)1yv.  
Sample name:  EDF-C1-56 wN2+3LY{  
Merging data from file EDF-C1-56 0-0.txt yoi4w 7:  
Finished merging RPC data for sample EDF-C1-56 N!A20Bv  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt .J#'k+>  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 R+sT &d  
a. 创建一个新的散射库 r;cDYg  
b. 散射模型命名 0MQ= Rt  
c. 改变散射模型为“Tabulated BSDF”. &{iC:zp  
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 ） fSh5u/F!  
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。 GnV0~?  
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，  i
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g. 点击OK 8WP>u8&  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 >&L|oq7$  
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脚本代码： O9gq <d  
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'#Language "WWB-COM" ]`o5eByo  
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Option Explicit xQ?>72grP  
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Sub Main Z1Qz LvWs  
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    'Cleanup 4Nm>5*]  
    ClearOutputWindow() fBO/0uW  
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    Print "Merging RPC Photonics BSDF Data Files" Jx*cq;`Vee  
    SetTextColor(255,0,0) Gk;YAI  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ! VwU=5  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 5'lVh/  
    SetTextColor(0,0,0) S"Al[{  
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    'Current directory of this script (should be the same as the text files being merged) :I"CQ C[Z  
    Dim cDir As String @xG&K{j  
    cDir = MacroDir$ & "\" :}Jx  
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    'Array which will be populated with the list of files to be merged (1/Sf&2i  
    Dim fList() As String, curFile As String M8^ID #  
    GetFileList( cDir, fList ) ~{
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    Print "" 6)HmE[[F  
    Print "Files found for merging:" #J5BHY~  
    For Each curFile In fList 6fwNlC/9  
        Print Chr(9) & curFile 5zuwqOD*  
    Next 8&QST!JGSX  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. *MJm:  
    Dim nameArray() As String, sampName As String b#2)"V(  
    nameArray = Split(fList(0)," 0-0.txt") g/?Vl2W  
    sampName  = nameArray(0)
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    Print "" y@LImiRG  
    Print "Sample name: " & Chr(9) & sampName 6#w>6g4V~R  
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    'Open an output file and write the FRED header data 0Q3U\cDr  
    Dim outFile As String (qcFGM22U  
    outFile = cDir & sampName & "_FRED.txt" GT>'|~e  
    Open outFile For Output As #1 wG3L+[,  
    Print #1, "type bsdf_data" F)P:lvp<r  
    Print #1, "format angles=deg bsdf=value scale=1" iAd&o`C  
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    'Loop the file list, skip the two header lines and write the remaining data to file ,%i Scr,z  
    Dim lineArray() As String, curLine As Long YV>a 3  
    For Each curFile In fList UBo0c?,4  
        Print "Merging data from file " & curFile lH fZw})d  
        ReadFile( cDir & curFile, lineArray ) +Z#=z,.
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        For curLine = 2 To UBound(lineArray) VO#rJ
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            Print #1, lineArray(curLine) *i#2>=)  
        Next vE]ge  
    Next ;H$Cq' I  
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    'Close the output file " <bjS  
    Close #1 h'ik3mLH  
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    Print "Finished merging RPC data for sample " & sampName H4i}gdR  
    Print "FRED formatted data file: " & Chr(9) & outFile =^"Sx??V  
End Sub Q0*E&;|  
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'Utility function to read the contents of a file into an array of strings. 2[ sY?C  
Function ReadFile(ByVal fileName As String, _ y"?`MzcJ0  
                  ByRef lineArray() As String) As Long qxRsq&_  
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    ReadFile = -1 32G
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    Dim oFSO As Object %PW-E($o<  
    Set oFSO = CreateObject("Scripting.FileSystemObject") mR}8}K]L  
    Erase lineArray b:1B >  
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    Dim fid As Long T! }G51  
    If oFSO.fileexists( fileName ) Then &-/J~b)"  
        fid = FreeFile() /P
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        Open fileName For Input As fid L1IF$eC  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) "jZZ>\  
        Close fid Rsx6vF8]5  
    End If aru2H6  
    Set oFSO = Nothing _ep&`K  
    Return UBound( lineArray ) [gzaOP`f  
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End Function l@Lk+-[D  
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Sub GetFileList( ByVal in_dir As String, _ +:A `e+\  
                 ByRef in_flist() As String ) AFt- V  
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    'Redimension the file list array pbz
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    Erase in_flist G>~/  
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    'Tracks how many files are found LM<*VhX  
    Dim fCount As Long .]9`eGVWj  
    fCount = 0 EXdX%T\  
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    'Recurse directory and search for text files jLFaf#G]  
    Dim f As String 8YSvBy  
    f = Dir$(in_dir & "*.txt") NbWEP\dS'z  
    While f <> "" AyJl
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        ReDim Preserve in_flist(fCount) |E13W  
        in_flist(fCount) = f B"v*[p?  
        fCount += 1 #jbC@A9Pe  
        f = Dir$() /{R ^J#  
    Wend e{6wFN  
    ReDim Preserve in_flist(fCount-1) D(z
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End Sub CW;zviH5  
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