[分享]RPC Photonics扩散片BSDF [复制链接]

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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。 
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背景： hiQ#<  
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。 3"HW{
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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。 U+FI^Xrt#  
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步骤 nWz7$O  
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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。 "|KhqV=?v  
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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） Z_.xglq{  
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 dFVx*{6  
例如下所示： f5ttQ&@FF  
Sample name:  EDF-C1-56 8.m9 =+)8  
Merging data from file EDF-C1-56 0-0.txt $WS?/H0C  
Finished merging RPC data for sample EDF-C1-56 y1c2(K>tu  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt l1I
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4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 [;RO=  
a. 创建一个新的散射库 O=E?m=FR"  
b. 散射模型命名 Hru~Y}V  
c. 改变散射模型为“Tabulated BSDF”. VY|'7in"M  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） ZD;1{  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 ly~tB LH}  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， )j/b`V6  
g. 点击OK D(&XmC[\Y  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 NA;OT7X[  
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脚本代码： V+Y;  
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'#Language "WWB-COM" h51)kN:  
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Option Explicit PyQ P K,  
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Sub Main 1 ` ={**  
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    'Cleanup e` {F7rd:  
    ClearOutputWindow() -4!S?rHwd+  
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    Print "Merging RPC Photonics BSDF Data Files" '"M9`@Y3^  
    SetTextColor(255,0,0) KzWqHq  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." cl1>S3  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 'D&[Y)f^  
    SetTextColor(0,0,0) .6HHUy  
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    'Current directory of this script (should be the same as the text files being merged) X(M|T]`b:  
    Dim cDir As String s)9d\{  
    cDir = MacroDir$ & "\" >\4"k4d}  
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    'Array which will be populated with the list of files to be merged -a\[`JHi  
    Dim fList() As String, curFile As String %ki^XB86  
    GetFileList( cDir, fList ) _?rL7oTv  
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    Print "" ]g
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    Print "Files found for merging:" 8'|
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    For Each curFile In fList '
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        Print Chr(9) & curFile b;jr;I  
    Next Zt/4|&w  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. i)=dp!Bx^  
    Dim nameArray() As String, sampName As String BBDt^$  
    nameArray = Split(fList(0)," 0-0.txt") C7Ny-rj}IA  
    sampName  = nameArray(0) R?5v//[  
    Print "" 1WUlBr/k  
    Print "Sample name: " & Chr(9) & sampName hmp!|Q[)  
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    'Open an output file and write the FRED header data %Fp1c K  
    Dim outFile As String wrm ReT?  
    outFile = cDir & sampName & "_FRED.txt" "(+p1  
    Open outFile For Output As #1 `BzjDI:a  
    Print #1, "type bsdf_data" \$W\[s4I  
    Print #1, "format angles=deg bsdf=value scale=1" 05s{Z.aK  
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    'Loop the file list, skip the two header lines and write the remaining data to file ~ya@ YP]';  
    Dim lineArray() As String, curLine As Long ')zf8>,  
    For Each curFile In fList bvF-F$n%F  
        Print "Merging data from file " & curFile sg%Ptp  
        ReadFile( cDir & curFile, lineArray ) t~_bquGk  
        For curLine = 2 To UBound(lineArray) w42=tN+B  
            Print #1, lineArray(curLine) IutU~%wv  
        Next s_#6^_  
    Next =O??W8u  
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    'Close the output file *o6hDhg  
    Close #1 LOi/+;>  
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    Print "Finished merging RPC data for sample " & sampName }s@vN8C  
    Print "FRED formatted data file: " & Chr(9) & outFile [m0G;%KR
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End Sub P-?R\(QYtR  
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'Utility function to read the contents of a file into an array of strings. (-%1z_@Y  
Function ReadFile(ByVal fileName As String, _ OJT%?P%@{  
                  ByRef lineArray() As String) As Long K9QC$b9(  
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    ReadFile = -1 75W@B}dZd  
    Dim oFSO As Object LO@o`JF  
    Set oFSO = CreateObject("Scripting.FileSystemObject") j]'ybpMT"  
    Erase lineArray '7JM/AcC#K  
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    Dim fid As Long >)6k)$x%%  
    If oFSO.fileexists( fileName ) Then 9}$'q$0R]  
        fid = FreeFile() :wY(</H  
        Open fileName For Input As fid wo5fGQJ
 
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) e)f!2'LL  
        Close fid bBY7^k  
    End If SQ-CdpT<  
    Set oFSO = Nothing G'{*guYU  
    Return UBound( lineArray ) CPci 'SO  
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End Function cCv@fks  
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Sub GetFileList( ByVal in_dir As String, _ @cB6,iUr  
                 ByRef in_flist() As String ) ]N{jF$  
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    'Redimension the file list array -+fW/Uo  
    Erase in_flist 4uE|$  
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    'Tracks how many files are found z-JYzxL9  
    Dim fCount As Long ;4k/h/o1#  
    fCount = 0 hxkwT  
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    'Recurse directory and search for text files K$c?:?wmo  
    Dim f As String ?X@uR5
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    f = Dir$(in_dir & "*.txt") mbXW$E-&R2  
    While f <> "" '}9 %12\^h  
        ReDim Preserve in_flist(fCount) `{H!V~42  
        in_flist(fCount) = f nG~^-
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        fCount += 1 e4<St`K  
        f = Dir$() d@ef+-  
    Wend K>_~|ZN1C8  
    ReDim Preserve in_flist(fCount-1) Le2rc*T  
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End Sub Zp+orc7  
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