[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： 0"#tK4  
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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。 yHCQY4/  
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背景： ok-sm~bp  
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。 R|$=Pfg~4  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 +m:U9K(\h  
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步骤 f|Z3VS0x  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 zST#X}  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） '}P)iS2  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 8BE OE<  
例如下所示： x@v,qF$K  
Sample name:  EDF-C1-56 _AI2\e  
Merging data from file EDF-C1-56 0-0.txt vFL3eu#  
Finished merging RPC data for sample EDF-C1-56 }s}b]v  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 2i |wQU5w  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 /A_</GYs  
a. 创建一个新的散射库 /'TzHO9_`  
b. 散射模型命名 fS1N(RZ1  
c. 改变散射模型为“Tabulated BSDF”. &5(|a"5+G  
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 ） s:*gjoL  
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。 z;#}uC  
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， Hi,_qlc+  
g. 点击OK : 60PO  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 []3xb`<&  
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脚本代码： qAR~js`5  
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'#Language "WWB-COM" x:xKlPGd  
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Option Explicit kzJNdYtdH  
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Sub Main 0m7J'gm{  
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    'Cleanup XXuU@G6Z7$  
    ClearOutputWindow() "}7K>|a  
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    Print "Merging RPC Photonics BSDF Data Files" }=s@y"["  
    SetTextColor(255,0,0) v :6`(5  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." JP!$uK{u  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." #q==GT7  
    SetTextColor(0,0,0) F=iz\O!6  
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    'Current directory of this script (should be the same as the text files being merged) "uTzmm$  
    Dim cDir As String jGR_EE  
    cDir = MacroDir$ & "\" [p}J=1S  
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    'Array which will be populated with the list of files to be merged zoC/Hm  
    Dim fList() As String, curFile As String DI!NP;E  
    GetFileList( cDir, fList ) G{+sC2  
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    Print "" oF]0o`U&a  
    Print "Files found for merging:" N(t1?R/e
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    For Each curFile In fList ;o%
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        Print Chr(9) & curFile Z(/jQ=ozQ  
    Next NjYpNd?g  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. xzW]D0o0  
    Dim nameArray() As String, sampName As String a3R#Bg(  
    nameArray = Split(fList(0)," 0-0.txt") f]T#q@|lE  
    sampName  = nameArray(0) }`f%"Z  
    Print "" g3LAi#m  
    Print "Sample name: " & Chr(9) & sampName #jA|
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    'Open an output file and write the FRED header data HQ/PHUg2  
    Dim outFile As String `+1*)bYxU  
    outFile = cDir & sampName & "_FRED.txt" iknBc-TLD  
    Open outFile For Output As #1 Kk9 JZ[nT'  
    Print #1, "type bsdf_data" Uk|Xs~@#E  
    Print #1, "format angles=deg bsdf=value scale=1" ,8+SQo#
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    'Loop the file list, skip the two header lines and write the remaining data to file hkHMBsNi  
    Dim lineArray() As String, curLine As Long cU%#oEMf<  
    For Each curFile In fList h!yF  
        Print "Merging data from file " & curFile (yc$W9  
        ReadFile( cDir & curFile, lineArray ) 2NIK0%6  
        For curLine = 2 To UBound(lineArray) ,dzbI{@6  
            Print #1, lineArray(curLine) 2x$\vL0  
        Next Pa0tf:  
    Next 1i bQ'bZ  
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    'Close the output file aJI>qk h?]  
    Close #1 &Vnet7LfU  
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    Print "Finished merging RPC data for sample " & sampName 2}~1poyi>  
    Print "FRED formatted data file: " & Chr(9) & outFile UupQ*,dJ  
End Sub u"X8(\pOn  
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'Utility function to read the contents of a file into an array of strings. Zm&Zz^s  
Function ReadFile(ByVal fileName As String, _ [gIStKe  
                  ByRef lineArray() As String) As Long 3"I1'+  
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    ReadFile = -1 RTLu]Bry  
    Dim oFSO As Object _f^q!tP&d  
    Set oFSO = CreateObject("Scripting.FileSystemObject") m]7Y )&3  
    Erase lineArray I[tU}ojP  
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    Dim fid As Long )ckx&e  
    If oFSO.fileexists( fileName ) Then <C# s0UX  
        fid = FreeFile() 6st(s@>  
        Open fileName For Input As fid [OH>NpL  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) Zu&trxnNf[  
        Close fid OEdp:dW|  
    End If P63z8^y  
    Set oFSO = Nothing :T%,.sH  
    Return UBound( lineArray ) J +<|8D  
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End Function F3';oyy  
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Sub GetFileList( ByVal in_dir As String, _ jDH)S{k  
                 ByRef in_flist() As String ) E<-}Jc1  
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    'Redimension the file list array iO<O2A.F  
    Erase in_flist Qbt fKn95  
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    'Tracks how many files are found &/=xtO/Z{  
    Dim fCount As Long =k3QymA  
    fCount = 0 HAGWA2wQ  
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    'Recurse directory and search for text files ]vKxgfF  
    Dim f As String Y*wbFL6`  
    f = Dir$(in_dir & "*.txt") 9FPl  
    While f <> "" `n5RDz/f0  
        ReDim Preserve in_flist(fCount) [r^f5;Z  
        in_flist(fCount) = f w$61+KHK  
        fCount += 1 tet  
        f = Dir$() O}#*U+j  
    Wend ,!sAr;Rk`  
    ReDim Preserve in_flist(fCount-1) 2S!=2u+7  
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End Sub mI0|lp 1$  
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