[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： xqX3uq  
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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。 9295:Y| w1  
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背景： (vG*)a  
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。 2p&$bft  
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。 \8xSfe  
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步骤 |<u+Xi ~  
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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。 vL@<l^`$0  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） 2jyWkAP'  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 &<;T$Y  
例如下所示： )c4tGT<  
Sample name:  EDF-C1-56 56)!&MF  
Merging data from file EDF-C1-56 0-0.txt DT`HS/~fH  
Finished merging RPC data for sample EDF-C1-56 _|u}^ML
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FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 3/+kjY/  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 bh@CtnO  
a. 创建一个新的散射库 `-{l$Hn9|~  
b. 散射模型命名 i9L]h69r  
c. 改变散射模型为“Tabulated BSDF”. 1L*[!QT4  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） c0zcR)=mL  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 g)#?$OhP"  
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， rC!O}(4t%$  
g. 点击OK K? o p3}f?  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 ee? d?:L  
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脚本代码： zd[k|lj  
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'#Language "WWB-COM" ESB^"|9  
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Option Explicit g8.z?Ia#5Z  
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Sub Main d` ttWWPw  
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    'Cleanup th73eC'  
    ClearOutputWindow() ~2k.x*$  
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    Print "Merging RPC Photonics BSDF Data Files" eE'P)^KV  
    SetTextColor(255,0,0) v)Y)tu>  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." -rU_bnm  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." r2SZC`Z}-M  
    SetTextColor(0,0,0) DujVV(+I  
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    'Current directory of this script (should be the same as the text files being merged) v's1&%sM  
    Dim cDir As String d0)]^4HT|y  
    cDir = MacroDir$ & "\" .6`r`|=  

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    'Array which will be populated with the list of files to be merged W!<7OA g$  
    Dim fList() As String, curFile As String x\Q}fk?{t  
    GetFileList( cDir, fList ) d3q%[[@  
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    Print "" lC#wh2B6  
    Print "Files found for merging:" dXxf{|gk>  
    For Each curFile In fList J+t51B(a  
        Print Chr(9) & curFile y!1X3X,V  
    Next H/{@eaV  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 9;LjM ~Ct  
    Dim nameArray() As String, sampName As String JxinfWk  
    nameArray = Split(fList(0)," 0-0.txt") _S{TjGZ&  
    sampName  = nameArray(0) n,FyK`x  
    Print "" <<LLEdB  
    Print "Sample name: " & Chr(9) & sampName ML>M:Ik+  
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    'Open an output file and write the FRED header data 48wt  
    Dim outFile As String h)Fc<,vwBE  
    outFile = cDir & sampName & "_FRED.txt" tn$TyCzckW  
    Open outFile For Output As #1 rY(7IX  
    Print #1, "type bsdf_data" `n>|rd  
    Print #1, "format angles=deg bsdf=value scale=1" ^>an4UJt  
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    'Loop the file list, skip the two header lines and write the remaining data to file KS8@A/f  
    Dim lineArray() As String, curLine As Long kKlNhP(  
    For Each curFile In fList Rf0so  
        Print "Merging data from file " & curFile +A8q.-N G  
        ReadFile( cDir & curFile, lineArray ) t|'%0 W  
        For curLine = 2 To UBound(lineArray) >0@w"aKn  
            Print #1, lineArray(curLine) c/+6M  
        Next DU6j0lz  
    Next {v
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    'Close the output file u)Kiw
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    Close #1 J\@g3
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    Print "Finished merging RPC data for sample " & sampName JL4E`  
    Print "FRED formatted data file: " & Chr(9) & outFile 'a0M.*f}G  
End Sub U3_O}X+  
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'Utility function to read the contents of a file into an array of strings. xY]q[a?cy  
Function ReadFile(ByVal fileName As String, _ *=oO3c0|b,  
                  ByRef lineArray() As String) As Long ;@S'8  
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    ReadFile = -1 d,?D '/  
    Dim oFSO As Object ]*=!lfrV  
    Set oFSO = CreateObject("Scripting.FileSystemObject") a0)w/A&  
    Erase lineArray P Ptmh. }e  
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    Dim fid As Long }< '6FxR  
    If oFSO.fileexists( fileName ) Then sxr,]@  
        fid = FreeFile() [_%u5sc-y  
        Open fileName For Input As fid DX!dU'tj  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) Ub f5:  
        Close fid DNZ,rL:h  
    End If jR}EBaI}  
    Set oFSO = Nothing pNd`fV#jX  
    Return UBound( lineArray ) h._eP.W`  
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End Function iPl,KjGk  
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Sub GetFileList( ByVal in_dir As String, _ |_ED*ATR=  
                 ByRef in_flist() As String ) 7~J>Ga  
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    'Redimension the file list array y@v)kN)Y9\  
    Erase in_flist iLv -*%%  
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    'Tracks how many files are found muXP5MO  
    Dim fCount As Long \mLEwNhRY  
    fCount = 0 &I=o1F2B)  
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    'Recurse directory and search for text files G^ k8Or2  
    Dim f As String 43h06X`  
    f = Dir$(in_dir & "*.txt") e46`"}r  
    While f <> "" LhKbZoPp  
        ReDim Preserve in_flist(fCount) <w}^Z}fpk&  
        in_flist(fCount) = f p4IyKry,  
        fCount += 1 Cxq|N]E  
        f = Dir$() l[_antokn  
    Wend '*XIp:  
    ReDim Preserve in_flist(fCount-1) OcMB)1uh\  
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End Sub
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