[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： yV]-Oa$*s0  
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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。 WCfe!P?g  
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背景： Mb/
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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。 $b 71  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 Xde=}9  
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步骤 {ZIFj.2  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 ThQEQ6y  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） ^[\53\R~  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 ?28GQyk4  
例如下所示： "?0G^zu  
Sample name:  EDF-C1-56 O>):^$-K%  
Merging data from file EDF-C1-56 0-0.txt uu/7Ie  
Finished merging RPC data for sample EDF-C1-56 ;eEtdoy  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt bg3jo
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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 (lck6v?h  
a. 创建一个新的散射库 .j<B5/+  
b. 散射模型命名 @/2wmza%2  
c. 改变散射模型为“Tabulated BSDF”. _.8]7f`*Gc  
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 ） PH4bM  
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。 ]3# @t:>  
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， 9DAwC:<r  
g. 点击OK 4y}a,  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 \,#4+&4b  
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脚本代码： |/Q."d  
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'#Language "WWB-COM" 4Jy,IKPp  
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Option Explicit
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Sub Main m3!MHe~t  
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    'Cleanup <EN[s  
    ClearOutputWindow() Uo)<_nG  
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    Print "Merging RPC Photonics BSDF Data Files" pQ`L=#WM  
    SetTextColor(255,0,0) 5+"8q#X$  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." _q4dgi z  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." _^sSI<&m  
    SetTextColor(0,0,0) =<uz'\Ytv%  
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    'Current directory of this script (should be the same as the text files being merged) ?-v?SN#  
    Dim cDir As String ?B:wV?-`  
    cDir = MacroDir$ & "\" krY.Cc]  
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    'Array which will be populated with the list of files to be merged bD[W
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    Dim fList() As String, curFile As String (=B7_jrl  
    GetFileList( cDir, fList ) ?Lb7~XKt\  
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    Print "" p.Yg-CA  
    Print "Files found for merging:" `l40awGCz  
    For Each curFile In fList /FZ )ej\  
        Print Chr(9) & curFile BqAwo  
    Next R,Uy3N  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 05zdy-Fb  
    Dim nameArray() As String, sampName As String #yOY&W:N  
    nameArray = Split(fList(0)," 0-0.txt") fBh|:2u  
    sampName  = nameArray(0) \>k#]4@rp  
    Print "" (D3m5fO  
    Print "Sample name: " & Chr(9) & sampName (?wKBUi  
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    'Open an output file and write the FRED header data `erQp0fBM  
    Dim outFile As String D"aQbQP  
    outFile = cDir & sampName & "_FRED.txt" [<Puh  
    Open outFile For Output As #1 pODo[Rkq  
    Print #1, "type bsdf_data" v333z<<S  
    Print #1, "format angles=deg bsdf=value scale=1" oQB1fs  
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    'Loop the file list, skip the two header lines and write the remaining data to file 0n^j 50Yq  
    Dim lineArray() As String, curLine As Long O3GaxM\x  
    For Each curFile In fList KywT Oq  
        Print "Merging data from file " & curFile !t{!.  
        ReadFile( cDir & curFile, lineArray ) 0+h?Bk  
        For curLine = 2 To UBound(lineArray) EFOQ;q  
            Print #1, lineArray(curLine) M,lu)~H  
        Next x&p=vUuukP  
    Next |%9~W^b  
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    'Close the output file sNTfRPC
 
    Close #1 1 crjRbi  
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    Print "Finished merging RPC data for sample " & sampName o4795r,jz  
    Print "FRED formatted data file: " & Chr(9) & outFile .=D6<4#t  
End Sub EaL+}/q&  
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'Utility function to read the contents of a file into an array of strings. O;tn5  
Function ReadFile(ByVal fileName As String, _ 4 .qjTR  
                  ByRef lineArray() As String) As Long }=)"uv  
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    ReadFile = -1 %M:"Ai5:  
    Dim oFSO As Object )A"7l7?.n)  
    Set oFSO = CreateObject("Scripting.FileSystemObject") O^hV<+CX  
    Erase lineArray Su^Z{ Ud`  
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    Dim fid As Long eIl&=gZ6>  
    If oFSO.fileexists( fileName ) Then 1uE[ %M  
        fid = FreeFile() )nVx 2m4  
        Open fileName For Input As fid W[DB!ue  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) \:S8mDI^s  
        Close fid MDt4KD+bZ  
    End If xCD+qP^  
    Set oFSO = Nothing g'@+#NMw  
    Return UBound( lineArray ) V00zk`PH  
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End Function AmFHn  
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Sub GetFileList( ByVal in_dir As String, _ C2T,1=  
                 ByRef in_flist() As String ) U/X ^  
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    'Redimension the file list array MvA_tRO  
    Erase in_flist rCYn YA  
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    'Tracks how many files are found Ig2VJs;  
    Dim fCount As Long EWi@1PAZK  
    fCount = 0 ah.Kb(d:  
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    'Recurse directory and search for text files BH1To&ol  
    Dim f As String {zcjTJ=Zt8  
    f = Dir$(in_dir & "*.txt") &-9D.'WzP  
    While f <> "" xYq8\9Qb  
        ReDim Preserve in_flist(fCount) ;DOz92X
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        in_flist(fCount) = f VrG|/2  
        fCount += 1 9v A`\\9  
        f = Dir$() 1Ppzch7  
    Wend JP]K\nQx'  
    ReDim Preserve in_flist(fCount-1) )/Vr 5b@  
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End Sub R:E:Y|&#