[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： e?bYjJq  
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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。 , *qCf@$I  
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背景： !.1%}4@Q]  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 ^`f*'Z  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 ;WL1B   
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步骤 E2L(wt}^  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 G;3~2^lB\  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） ~el3I=KC}  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 #}^-C&~  
例如下所示： | nJZie8m  
Sample name:  EDF-C1-56 *Ywpz^2?:  
Merging data from file EDF-C1-56 0-0.txt 1+`l
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Finished merging RPC data for sample EDF-C1-56 0N=X
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FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt .lhn;*Yi  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 {2`=qt2  
a. 创建一个新的散射库 drwg
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b. 散射模型命名 ;d$qc<2uA  
c. 改变散射模型为“Tabulated BSDF”. p (FlR?= S  
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 ） p1c3Q$>i  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 FZiW|G  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， c.\O/N   
g. 点击OK G1 o70  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 I &*_,d  
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脚本代码： ;DnUQj  
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'#Language "WWB-COM" N?dvuB  
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Option Explicit *sQcg8{^  
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Sub Main zq5'i!s !0  
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    'Cleanup ~#\i!I;RY}  
    ClearOutputWindow() PCc|}*b  
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    Print "Merging RPC Photonics BSDF Data Files" weMww,:^[  
    SetTextColor(255,0,0) Wi n8LOC  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." CGw--`#\  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 7:=5"ScV  
    SetTextColor(0,0,0) URcR  
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    'Current directory of this script (should be the same as the text files being merged) }W)=@t  
    Dim cDir As String N12:{U  
    cDir = MacroDir$ & "\" *0Gz)'  
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    'Array which will be populated with the list of files to be merged $N$ FtpB  
    Dim fList() As String, curFile As String p<WFqLe(":  
    GetFileList( cDir, fList ) 3HyhEVR-#~  
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    Print "" !/K8xD$  
    Print "Files found for merging:" 151tXSzLT  
    For Each curFile In fList F)$K  
        Print Chr(9) & curFile 'UM!*fk7C  
    Next ghk5rl$   
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. !rxp?V n -  
    Dim nameArray() As String, sampName As String ;)DzCc/  
    nameArray = Split(fList(0)," 0-0.txt") tqOi x/  
    sampName  = nameArray(0) j_?cpm{~ml  
    Print "" zvv:dC/p<  
    Print "Sample name: " & Chr(9) & sampName k7_I$<YDj  
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    'Open an output file and write the FRED header data V'Y
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    Dim outFile As String )Du-_Z  
    outFile = cDir & sampName & "_FRED.txt" ;i#LIHJ  
    Open outFile For Output As #1 go)p%}s  
    Print #1, "type bsdf_data" juToO  
    Print #1, "format angles=deg bsdf=value scale=1" MBk"KF  
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    'Loop the file list, skip the two header lines and write the remaining data to file 7x.%hRk  
    Dim lineArray() As String, curLine As Long @kngI7=E  
    For Each curFile In fList r -
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        Print "Merging data from file " & curFile >3;^l/2c  
        ReadFile( cDir & curFile, lineArray ) h"QbA"  
        For curLine = 2 To UBound(lineArray) FN"rZWM  
            Print #1, lineArray(curLine) nYv#4*  
        Next >L2*CV3p  
    Next zCXqBuvu1  
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    'Close the output file ((3t:  
    Close #1 4".J/I5u  
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    Print "Finished merging RPC data for sample " & sampName #t71U a  
    Print "FRED formatted data file: " & Chr(9) & outFile 4sY[az  
End Sub K, (65>86;  
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'Utility function to read the contents of a file into an array of strings. >M^&F6  
Function ReadFile(ByVal fileName As String, _ 'ND36jHcRD  
                  ByRef lineArray() As String) As Long }6~)bLzI}  
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    ReadFile = -1 qR,.W/eS8  
    Dim oFSO As Object 5 Rz/Ri\c=  
    Set oFSO = CreateObject("Scripting.FileSystemObject") $>vy(Y  
    Erase lineArray iV)ac\  
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    Dim fid As Long oW'POAr  
    If oFSO.fileexists( fileName ) Then D?u`  
        fid = FreeFile() l=Wd,$\  
        Open fileName For Input As fid A|vP$zy  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) *m_93J  
        Close fid t!l%/$-  
    End If S!j^|!  
    Set oFSO = Nothing Fe="EDh  
    Return UBound( lineArray ) G:+16XCra  
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End Function ^tE_LL+ji|  
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Sub GetFileList( ByVal in_dir As String, _ AUAI3K?  
                 ByRef in_flist() As String ) CX+9R3pa  
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    'Redimension the file list array [,7-w  
    Erase in_flist 6+%-GgPf  
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    'Tracks how many files are found #\b ;2>  
    Dim fCount As Long jfSg){  
    fCount = 0 w`#fH  
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    'Recurse directory and search for text files rA#s  
    Dim f As String 94z8B;+H]  
    f = Dir$(in_dir & "*.txt") ]18Ucf  
    While f <> "" *]!l%Uf
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        ReDim Preserve in_flist(fCount) fOW_
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        in_flist(fCount) = f F"BL#g66  
        fCount += 1 eUs-5 L  
        f = Dir$() X8b#[40:  
    Wend 6F ;Or  
    ReDim Preserve in_flist(fCount-1) WD;)VsP  
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End Sub 0#=W#Jl>