[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： 8HX(1nNj}  
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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。 eHF#ME  
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背景： \v9IbU*js  
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。 cbs
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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。 T=:O(R1*0  
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步骤 "^ydoRZ  
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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。 *GbC`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） -2o4v#d  
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 AW&HWc~A  
例如下所示： 2uZ <q?=  
Sample name:  EDF-C1-56 /S$p_7N  
Merging data from file EDF-C1-56 0-0.txt I.Co8is  
Finished merging RPC data for sample EDF-C1-56 .6xP>!E}Q  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt W tnZF]1:u  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 1 <.I2\^  
a. 创建一个新的散射库 
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b. 散射模型命名 A@j;H|  
c. 改变散射模型为“Tabulated BSDF”. [5:
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d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） -6;0 x  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 6%JKY
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f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， f*Xonb  
g. 点击OK [^A.$,  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 {0q;:
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脚本代码： vpFN{UfD  
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'#Language "WWB-COM" 'v* =}k  
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Option Explicit e7t).s)b{  
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Sub Main Z=sy~6m+v  
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    'Cleanup 3q R@$pm  
    ClearOutputWindow() 5znLpBX<N  
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    Print "Merging RPC Photonics BSDF Data Files" 4-eb&
 
    SetTextColor(255,0,0) ilw<Q-o4(  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." =%znY`0b56  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." Kf76./  
    SetTextColor(0,0,0) {q~Bss{z  
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    'Current directory of this script (should be the same as the text files being merged) r) T^ Td1  
    Dim cDir As String ZD6rD(l9  
    cDir = MacroDir$ & "\" i6-q%%]6  
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    'Array which will be populated with the list of files to be merged $lOx 6rL  
    Dim fList() As String, curFile As String @/lLLGrZ"  
    GetFileList( cDir, fList ) /R^HRzTO  
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    Print "" @CP"AYB #  
    Print "Files found for merging:" 7I/Sfmqy"O  
    For Each curFile In fList SIKy8?Fn  
        Print Chr(9) & curFile n!|K#  
    Next p)f OAr
 
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. X"(!\{ySI;  
    Dim nameArray() As String, sampName As String i)1E[jc{p!  
    nameArray = Split(fList(0)," 0-0.txt") U>(5J,G  
    sampName  = nameArray(0) ;Z-Cn.  
    Print "" ;*:d)'A  
    Print "Sample name: " & Chr(9) & sampName &O#a==F!(  
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    'Open an output file and write the FRED header data I.fV_ H^  
    Dim outFile As String n4 KiC!*i0  
    outFile = cDir & sampName & "_FRED.txt" Bg-C:Ok2'  
    Open outFile For Output As #1 { Y|h;@j$  
    Print #1, "type bsdf_data" Z_iu^Q  
    Print #1, "format angles=deg bsdf=value scale=1"
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    'Loop the file list, skip the two header lines and write the remaining data to file yrdJX  
    Dim lineArray() As String, curLine As Long ":"QsS#*"#  
    For Each curFile In fList H:`W\CP7_  
        Print "Merging data from file " & curFile HyiuU`  
        ReadFile( cDir & curFile, lineArray ) Xf:CGR8_  
        For curLine = 2 To UBound(lineArray) X9/V;!  
            Print #1, lineArray(curLine) T73oW/.0X?  
        Next C0jmjZ%w@  
    Next jm =E_86_  
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    'Close the output file uw LT$  
    Close #1 .hg<\-:_  
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    Print "Finished merging RPC data for sample " & sampName @I]uK[qd  
    Print "FRED formatted data file: " & Chr(9) & outFile ;QR|v  
End Sub -vGyEd7  
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'Utility function to read the contents of a file into an array of strings. N(dn"`
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Function ReadFile(ByVal fileName As String, _ Qf414 oW  
                  ByRef lineArray() As String) As Long %{yr#F=t#]  

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    ReadFile = -1 H+F?)VX}oA  
    Dim oFSO As Object L:`|lc=^  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 4.,e3  
    Erase lineArray j5R= K*y  
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    Dim fid As Long &m5WmEz>`  
    If oFSO.fileexists( fileName ) Then NRcg~Nu  
        fid = FreeFile() ]b'K BAMy  
        Open fileName For Input As fid Ufq"_^4  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) <eO 7b6_  
        Close fid <.l5>mgkCw  
    End If 3a:(\:?z  
    Set oFSO = Nothing 'an{<82i  
    Return UBound( lineArray ) 7Hf6$2Wh  
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End Function 0+/L?J3  
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Sub GetFileList( ByVal in_dir As String, _ D?}LKs[  
                 ByRef in_flist() As String ) <!y_L5S|  
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    'Redimension the file list array J%aW^+O  
    Erase in_flist 3cT  
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    'Tracks how many files are found Z
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    Dim fCount As Long kC01s  
    fCount = 0 5`^"<wNI  
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    'Recurse directory and search for text files oMLpl3pl  
    Dim f As String &'WgBjP  
    f = Dir$(in_dir & "*.txt") iFF/[P  
    While f <> "" YxS*im[%]  
        ReDim Preserve in_flist(fCount) /# 0@C[9  
        in_flist(fCount) = f To}L%
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        fCount += 1 /p<mD-:.M  
        f = Dir$() IhM-a Y y5  
    Wend MG8-1M  
    ReDim Preserve in_flist(fCount-1) eP&K]#  
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End Sub }=?r`J+Ev;