[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： y15 MWZ  
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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。 7m4gGkX#r  
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背景： 1q?b?.  
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。 3CKd[=-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。 7@[HRr  
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步骤 4$5d*7  
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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。 i8h(b2odQ  
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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） gY\g+df-  
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 0 |/:m  
例如下所示： Q140b;Z  
Sample name:  EDF-C1-56 ]JQ+*ZYUE  
Merging data from file EDF-C1-56 0-0.txt )td?t.4
 
Finished merging RPC data for sample EDF-C1-56 N5ph70#y3  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt )aV\=a |A  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 5s
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a. 创建一个新的散射库 rE&`G[(b  
b. 散射模型命名 Q|gw\.]$&[  
c. 改变散射模型为“Tabulated BSDF”. f1Z
 
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 ） P!6v0ezN  
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。 `:aml+  
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， n+sV$*wvS  
g. 点击OK 31y>/*}  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 iXF iFsb  
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脚本代码： P' ";L6h  
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'#Language "WWB-COM" k;7R3O@  
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Option Explicit GlVb|O"  
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Sub Main hJ)\Vo  
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    'Cleanup H'2J!/V  
    ClearOutputWindow() _,"?R]MO  
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    Print "Merging RPC Photonics BSDF Data Files" p aQ"[w  
    SetTextColor(255,0,0) (O[:-Aqm  
    Print "Note: Script should be located in the same folder as the BSDF TXT files."
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    Print "Note: Do not run this script multiple times without deleting the output file between executions." E$4_.Z8sRw  
    SetTextColor(0,0,0) #4yh-D"  
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    'Current directory of this script (should be the same as the text files being merged) \68x]q[  
    Dim cDir As String M%3P@GRg  
    cDir = MacroDir$ & "\" MV(Sb:RZ  
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    'Array which will be populated with the list of files to be merged Ej[
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    Dim fList() As String, curFile As String  9Kpzj43  
    GetFileList( cDir, fList ) 1"hd5a  
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    Print "" fQ[& ^S$  
    Print "Files found for merging:" Vgj&hdbd  
    For Each curFile In fList b|rMmx8vA  
        Print Chr(9) & curFile MF41q%9p  
    Next 'XbrO|%  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. QE#Ar8tU  
    Dim nameArray() As String, sampName As String I7S#vIMXR.  
    nameArray = Split(fList(0)," 0-0.txt") 34Fc oud);  
    sampName  = nameArray(0) ]N& Y25oT5  
    Print "" mY'c<>6t  
    Print "Sample name: " & Chr(9) & sampName fr19C%{  
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    'Open an output file and write the FRED header data z_ 01*O  
    Dim outFile As String x!i(M>P  
    outFile = cDir & sampName & "_FRED.txt" |e%o  
    Open outFile For Output As #1 e7$ZA#A_5v  
    Print #1, "type bsdf_data" ^&Exa6=*FT  
    Print #1, "format angles=deg bsdf=value scale=1" fYt y7  
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    'Loop the file list, skip the two header lines and write the remaining data to file MS=
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    Dim lineArray() As String, curLine As Long J% b`*?A  
    For Each curFile In fList T, z80m}  
        Print "Merging data from file " & curFile k^%Kw(/  
        ReadFile( cDir & curFile, lineArray ) y-1!@|l0:6  
        For curLine = 2 To UBound(lineArray) +n>_NVe  
            Print #1, lineArray(curLine) wuV*!oefo  
        Next Ofm?`SE*|  
    Next SKUri  
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    'Close the output file 7<Yf  
    Close #1 G9|w o)N  
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    Print "Finished merging RPC data for sample " & sampName !Z}d^$  
    Print "FRED formatted data file: " & Chr(9) & outFile $GI
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End Sub G9YfJ?I  
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'Utility function to read the contents of a file into an array of strings. eF06B'uL  
Function ReadFile(ByVal fileName As String, _ j{`C|zg  
                  ByRef lineArray() As String) As Long "J
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    ReadFile = -1 r2xXS&9!|  
    Dim oFSO As Object 1[
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    Set oFSO = CreateObject("Scripting.FileSystemObject") l`wF;W!  
    Erase lineArray "{@Q..hxC  
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    Dim fid As Long A#@9|3  
    If oFSO.fileexists( fileName ) Then je[1>\3W  
        fid = FreeFile() ;WqWD
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        Open fileName For Input As fid d OYEl<!J  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) })#SjFq<V  
        Close fid 3$yOv"`  
    End If vTk\6o q  
    Set oFSO = Nothing d8p<f+  
    Return UBound( lineArray ) +5k^-  
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End Function .:U`4->E  
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Sub GetFileList( ByVal in_dir As String, _ |3:e$  
                 ByRef in_flist() As String ) Fs}vI~}  
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    'Redimension the file list array @,i_Gw)  
    Erase in_flist EG&97lb  
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    'Tracks how many files are found @}oY6cW;B*  
    Dim fCount As Long 0LW|5BVbIO  
    fCount = 0 G oHdhne3  
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    'Recurse directory and search for text files KccIYn~  
    Dim f As String 7/>#yR  
    f = Dir$(in_dir & "*.txt") G<_<j}=  
    While f <> "" Fo:60)
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        ReDim Preserve in_flist(fCount) !C3ozZ<  
        in_flist(fCount) = f
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        fCount += 1 m.g2>r`NU  
        f = Dir$() Gdu5 &]H#6  
    Wend E8LZ% N#  
    ReDim Preserve in_flist(fCount-1) L8WYxJ k  
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End Sub F39H@%R  
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