[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： 0a's[>-'A  
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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。 k!wEPi]  
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背景： Bjsg!^X7  
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。 k iY1  
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。 Md1ePp]  
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步骤 H_7EK  
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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。 WQYw@M~4Q!  
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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） eq$.np  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 ;Z{jol  
例如下所示： i~EFRI@  
Sample name:  EDF-C1-56 2GBE=T  
Merging data from file EDF-C1-56 0-0.txt 6n$g73u<=3  
Finished merging RPC data for sample EDF-C1-56 %8g1h)F"S  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt O/PO?>@-/  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 </jTWc'}  
a. 创建一个新的散射库 Z(a,$__  
b. 散射模型命名 j.7BoV  
c. 改变散射模型为“Tabulated BSDF”. pK@8=+  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） B)u*c]<qU  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 Xg1QF^  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， xr1,D5  
g. 点击OK v,A8Mk2s#  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 E4N{;'  
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脚本代码： F>s5<pKAX  
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'#Language "WWB-COM" 2"!s8x1$  
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Option Explicit ^ah9:}Ll  
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Sub Main jLv8
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    'Cleanup R>n=_C  
    ClearOutputWindow() K+@R [  
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    Print "Merging RPC Photonics BSDF Data Files" gX!-s*{E  
    SetTextColor(255,0,0) F!&$Z .  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 8XdgtYm  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." NNP ut$.  
    SetTextColor(0,0,0) Dt=@OZW  
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    'Current directory of this script (should be the same as the text files being merged) j NkobJ1  
    Dim cDir As String B0|!s  
    cDir = MacroDir$ & "\" b]k9c1x  
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    'Array which will be populated with the list of files to be merged rki0!P`  
    Dim fList() As String, curFile As String <
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    GetFileList( cDir, fList ) =WM^i86  
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    Print "" H[D<G9:  
    Print "Files found for merging:" 0*yD   
    For Each curFile In fList 85Red~-M  
        Print Chr(9) & curFile /l1OC(hm  
    Next 9vI<\ Xa  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. FDCc?>,o  
    Dim nameArray() As String, sampName As String bfXyuv  
    nameArray = Split(fList(0)," 0-0.txt") M2lvD&  
    sampName  = nameArray(0) jiqE^j3;  
    Print "" ZGj ^,?a  
    Print "Sample name: " & Chr(9) & sampName < wi9   
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    'Open an output file and write the FRED header data ~kFL[Asnaf  
    Dim outFile As String  jH>`:  
    outFile = cDir & sampName & "_FRED.txt" ]+A%37  
    Open outFile For Output As #1 FS^~e-A  
    Print #1, "type bsdf_data" 3>QkO.b  
    Print #1, "format angles=deg bsdf=value scale=1" ???`BF[|  
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    'Loop the file list, skip the two header lines and write the remaining data to file Lz{z~xNHW.  
    Dim lineArray() As String, curLine As Long @L?K
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    For Each curFile In fList {ep(_1  
        Print "Merging data from file " & curFile cp$GP*{@  
        ReadFile( cDir & curFile, lineArray ) MUn(ZnQy|  
        For curLine = 2 To UBound(lineArray) ~sT1J|  
            Print #1, lineArray(curLine) WT63ve  
        Next @8*lqV2  
    Next y4)iL?!J~  
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    'Close the output file 'e/wjV  
    Close #1 nM
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    Print "Finished merging RPC data for sample " & sampName TyhO+;  
    Print "FRED formatted data file: " & Chr(9) & outFile <.".,Na(J0  
End Sub C?j:+  
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'Utility function to read the contents of a file into an array of strings. f0&%  
Function ReadFile(ByVal fileName As String, _ F.),|t$\  
                  ByRef lineArray() As String) As Long rXP~k]tC  
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    ReadFile = -1 gCq'#G\Z  
    Dim oFSO As Object D$N;Qb  
    Set oFSO = CreateObject("Scripting.FileSystemObject") =M=v; ,I-  
    Erase lineArray C),i#v  
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    Dim fid As Long
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    If oFSO.fileexists( fileName ) Then < 1[K1'7h  
        fid = FreeFile() g%<n9AUl  
        Open fileName For Input As fid |'-%d^Z  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) CEW1T_1U<\  
        Close fid eG7Yyz+t$  
    End If _\na9T~g  
    Set oFSO = Nothing X,{ 3_  
    Return UBound( lineArray ) S$ffTdRz  
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End Function E!_3?:[S_  
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Sub GetFileList( ByVal in_dir As String, _ u'nQC*iJb  
                 ByRef in_flist() As String ) M|NQoQ8q  
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    'Redimension the file list array 2VzYP~Jg  
    Erase in_flist 5|5p -B  
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    'Tracks how many files are found 2RQ-L  
    Dim fCount As Long /,`OF/%  
    fCount = 0 H@1}_d  
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    'Recurse directory and search for text files IVY)pS"pR"  
    Dim f As String L0oVXmlr  
    f = Dir$(in_dir & "*.txt") v&bG`\!  
    While f <> "" Evd|_W-  
        ReDim Preserve in_flist(fCount) ?}uuTNLl)  
        in_flist(fCount) = f HItN
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        fCount += 1 @S=9@3m{w;  
        f = Dir$() f}J(nz>Sh  
    Wend 6tFi\,)E  
    ReDim Preserve in_flist(fCount-1) ]IEZ?+F,  
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End Sub a>x6n3{  
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