[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： IY9##&c3>  
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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。 wn{DY v7B  
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背景： .3T#:Hl  
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。 Jyu*{  
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。 Y]t)k9|vv  
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步骤 m:XMF)tW  
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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。 MXU8QVSY"  
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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） dD8f`*"*=  
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 <ekLL{/O'  
例如下所示： jPNm $Y1  
Sample name:  EDF-C1-56 [S!_ubP5  
Merging data from file EDF-C1-56 0-0.txt R k).D6  
Finished merging RPC data for sample EDF-C1-56 L2 tSKw~  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt P ".[=h  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 "V/6 nuCo  
a. 创建一个新的散射库 RZ&T\;m,7  
b. 散射模型命名 $]yHk  
c. 改变散射模型为“Tabulated BSDF”. /"<o""<]  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） CwVORf,uA  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 ?5g0#wqI  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， WwM/M!98J  
g. 点击OK ]RJcY1  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 x7]Yn'^'  
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脚本代码： ,s,VOyr @F  
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'#Language "WWB-COM" ^/kn#1H7&  
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Option Explicit ESl</"<J  
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Sub Main tb-:9*2j-  
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    'Cleanup ,!s;o6|*y  
    ClearOutputWindow() *g<D p2`  
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    Print "Merging RPC Photonics BSDF Data Files" }QL 2#R  
    SetTextColor(255,0,0) jLs-
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    Print "Note: Script should be located in the same folder as the BSDF TXT files." (0T6kD  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." O:Fnxp5@  
    SetTextColor(0,0,0) ?x(]U+  
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    'Current directory of this script (should be the same as the text files being merged) D|}%(N@sl  
    Dim cDir As String 67/&.d!  
    cDir = MacroDir$ & "\" ,wN>
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    'Array which will be populated with the list of files to be merged =hO0@w  
    Dim fList() As String, curFile As String 2R!1Vl  
    GetFileList( cDir, fList ) -&u2C}4s  
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    Print "" <I{)p;u1  
    Print "Files found for merging:" f@%H"8w!  
    For Each curFile In fList <d GGH  
        Print Chr(9) & curFile VE<&0d<  
    Next t@TBx=16  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. \WnI&nu  
    Dim nameArray() As String, sampName As String ]iyJ>fC  
    nameArray = Split(fList(0)," 0-0.txt") Q}N.DM@d3  
    sampName  = nameArray(0) =W6AUN/%p  
    Print "" k#I4^  
    Print "Sample name: " & Chr(9) & sampName e[HP]$\  
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    'Open an output file and write the FRED header data yE(>R(^  
    Dim outFile As String F8J;L]
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    outFile = cDir & sampName & "_FRED.txt" DL5`A?/  
    Open outFile For Output As #1 DA_[pR  
    Print #1, "type bsdf_data" Q3M;'m  
    Print #1, "format angles=deg bsdf=value scale=1" s!Xj'H7K  
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    'Loop the file list, skip the two header lines and write the remaining data to file lH6z
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    Dim lineArray() As String, curLine As Long 5h9`lS2  
    For Each curFile In fList G
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        Print "Merging data from file " & curFile S(^*DV  
        ReadFile( cDir & curFile, lineArray ) !4 4)=xW  
        For curLine = 2 To UBound(lineArray) =gCv`SFW  
            Print #1, lineArray(curLine) \>8"r,hG|  
        Next sglYT!O  
    Next 6OJ`R.DM`  
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    'Close the output file GoI3hp(  
    Close #1 &wbe^Wp  
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    Print "Finished merging RPC data for sample " & sampName )&"l3*x  
    Print "FRED formatted data file: " & Chr(9) & outFile h2 2-vX  
End Sub xF'9`y^]!@  
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'Utility function to read the contents of a file into an array of strings. N#-P}\Q9  
Function ReadFile(ByVal fileName As String, _ }LDH/# u  
                  ByRef lineArray() As String) As Long 28u)q2s^W|  
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    ReadFile = -1 bDa(@QJ-  
    Dim oFSO As Object  7(;M  
    Set oFSO = CreateObject("Scripting.FileSystemObject") X'4g\)*  
    Erase lineArray 8Yr_$5R  
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    Dim fid As Long *]Nd I  
    If oFSO.fileexists( fileName ) Then KLW#+vZ  
        fid = FreeFile() VC "66\d&  
        Open fileName For Input As fid b[<zT[.:  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) p/|]])2  
        Close fid 12\h| S~  
    End If B w1ir  
    Set oFSO = Nothing ;iJ*.wVq  
    Return UBound( lineArray ) 6Y^UC2TBs  
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End Function a"^0;a  
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Sub GetFileList( ByVal in_dir As String, _ :-B,Q3d  
                 ByRef in_flist() As String ) QMoh<[3qu  
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    'Redimension the file list array X\tE#c&K  
    Erase in_flist H]V@Q~?e  
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    'Tracks how many files are found T^3_d93}d  
    Dim fCount As Long zc&>RM  
    fCount = 0 X}.y-X#v5J  
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    'Recurse directory and search for text files rPVz!(;k  
    Dim f As String gP
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    f = Dir$(in_dir & "*.txt") T8& kxp  
    While f <> "" VG*Tdaua~  
        ReDim Preserve in_flist(fCount) 0|g|k7c{rF  
        in_flist(fCount) = f -1Acprr  
        fCount += 1 RG [*:ReB9  
        f = Dir$() CV%AqJN  
    Wend Ek|#P{!  
    ReDim Preserve in_flist(fCount-1) [5 Mt,skC:  

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End Sub *oAv:8"iY  
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