[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： wJgM.V"yb  
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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。 OC[a?#R1  
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背景： /|\`NARI  
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。 *;}!WDr  
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。 /!
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步骤 c]n4vhUa5  
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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。 ~<$8i}7  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） %] Bb;0G  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 b
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例如下所示： *$s)p>  
Sample name:  EDF-C1-56 :2?'mKa7  
Merging data from file EDF-C1-56 0-0.txt 7_{x '#7  
Finished merging RPC data for sample EDF-C1-56 Fq{nc]L6  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt :4;>).  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ({8Q=Gh  
a. 创建一个新的散射库 l/1uP  
b. 散射模型命名 ;;U2I5 M7  
c. 改变散射模型为“Tabulated BSDF”. YnNei 7R  
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 ） &d*9#?9  
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。 \myj Y  
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， Qr0GxGWU  
g. 点击OK A]n!d}?  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 CtE".UlCA  
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脚本代码： 0)84Z.k  
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'#Language "WWB-COM" /bw-*  
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Option Explicit fZGKVxo"  
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Sub Main U} g%`<  
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    'Cleanup 5=
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    ClearOutputWindow() CZ0 {*K:  
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    Print "Merging RPC Photonics BSDF Data Files" g_}@/5?y  
    SetTextColor(255,0,0) 6)?TWr'Ke  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 1%+0OmV&  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ,=
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    SetTextColor(0,0,0) 'fgDe  
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    'Current directory of this script (should be the same as the text files being merged) N*z<VZ  
    Dim cDir As String -Z
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    cDir = MacroDir$ & "\" A,iXiDb3pK  
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    'Array which will be populated with the list of files to be merged M0]fh5O  
    Dim fList() As String, curFile As String %ZxKN;  
    GetFileList( cDir, fList ) w68qyG|wM  
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    Print "" x^;nfqn|  
    Print "Files found for merging:" }M1<a4~  
    For Each curFile In fList EZ=M^0=Hpf  
        Print Chr(9) & curFile Oc8+an1m  
    Next 3b_#xr-  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 1n5&PNu  
    Dim nameArray() As String, sampName As String x,V_P/?%  
    nameArray = Split(fList(0)," 0-0.txt") "JGaw_o  
    sampName  = nameArray(0) ^X?[zc GE  
    Print "" oW8[2$_N+  
    Print "Sample name: " & Chr(9) & sampName \k* ]w_m-  
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    'Open an output file and write the FRED header data !7w-?1?D  
    Dim outFile As String a@X'oV`(2b  
    outFile = cDir & sampName & "_FRED.txt" 9V;m;sz  
    Open outFile For Output As #1 G(4k#jB  
    Print #1, "type bsdf_data" Wqqo8Y~fq  
    Print #1, "format angles=deg bsdf=value scale=1" EXzY4D ^  
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    'Loop the file list, skip the two header lines and write the remaining data to file >Te{a*`"m:  
    Dim lineArray() As String, curLine As Long dxd}:L~z  
    For Each curFile In fList %:/;R_  
        Print "Merging data from file " & curFile FJD*A`a  
        ReadFile( cDir & curFile, lineArray ) fY `A

 
        For curLine = 2 To UBound(lineArray)
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            Print #1, lineArray(curLine)
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        Next [;b9'7j'  
    Next ' ZB%McS  
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    'Close the output file n[clYi@e  
    Close #1 ^.4<#Qs  
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    Print "Finished merging RPC data for sample " & sampName 65}:2l2<  
    Print "FRED formatted data file: " & Chr(9) & outFile Xu T|vh  
End Sub {<i!Pm  
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'Utility function to read the contents of a file into an array of strings. 6-^+btl)#  
Function ReadFile(ByVal fileName As String, _ (O&b:D/Y  
                  ByRef lineArray() As String) As Long $51#xe  
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    ReadFile = -1 @3G3l|~>  
    Dim oFSO As Object m:H )b{  
    Set oFSO = CreateObject("Scripting.FileSystemObject") z C``G<TB  
    Erase lineArray 6m{3GKaW~  
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    Dim fid As Long "47nc1T+n  
    If oFSO.fileexists( fileName ) Then g_q{3PW.  
        fid = FreeFile() ~p8!
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        Open fileName For Input As fid /RMep8&  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) }{ P}P}  
        Close fid i^W\YLE  
    End If ;m\(fW*ii  
    Set oFSO = Nothing t EN%mK  
    Return UBound( lineArray ) 2vur_`cV  
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End Function aH~il!K  
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Sub GetFileList( ByVal in_dir As String, _ OU[Sm7B  
                 ByRef in_flist() As String ) QTDI^ZeuF  
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    'Redimension the file list array ClEtw  
    Erase in_flist 5=$D~>-#  
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    'Tracks how many files are found 7+z%O3k'I  
    Dim fCount As Long m3,v&Z  
    fCount = 0 +[>m`XTq  
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    'Recurse directory and search for text files K4 >d  
    Dim f As String lKa}Bcd  
    f = Dir$(in_dir & "*.txt") E0*81PS  
    While f <> "" 7[K$os5al  
        ReDim Preserve in_flist(fCount) M^bujGD  
        in_flist(fCount) = f "{&!fD~w  
        fCount += 1 dtnAMa5$T  
        f = Dir$() ^,rbA>/L  
    Wend U_!6pqFc  
    ReDim Preserve in_flist(fCount-1) w</
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End Sub ){,8}(|  
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