[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： G@l|u  
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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。 R}=]UOqH-  
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背景： fSb@7L  
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。 0$dY;,Q.  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 X#\P.$  
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步骤 9"l%tq_  
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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。 C8%nBa/  
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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） {Ac3/U
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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 q?b)zeJ  
例如下所示： %>Q
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Sample name:  EDF-C1-56 ]`+"o[  
Merging data from file EDF-C1-56 0-0.txt iOA3x 8J  
Finished merging RPC data for sample EDF-C1-56 ,jdKcWy'  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 9cHNwgD>v  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 z8MpE  
a. 创建一个新的散射库 _KlPbyLU  
b. 散射模型命名 aG&kl O>m  
c. 改变散射模型为“Tabulated BSDF”. P24  
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 ） pz z`4VS:  
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。 EC&19  
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， Ql!6I(  
g. 点击OK l[OQo|_  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 Hwi7oXP  
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脚本代码： )}Mt'd  
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'#Language "WWB-COM" [@71  
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Option Explicit {Eb2<;1o{  
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Sub Main SF}L3/C&h  
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    'Cleanup o3`gx  
    ClearOutputWindow() *xX0]{49q  
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    Print "Merging RPC Photonics BSDF Data Files" I2!&="7@  
    SetTextColor(255,0,0) e2H'uMy;&  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 3R96;d;  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." \y+F!;IxL  
    SetTextColor(0,0,0) vt7
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    'Current directory of this script (should be the same as the text files being merged) }z%/6`7)|  
    Dim cDir As String a[OLS+zf!P  
    cDir = MacroDir$ & "\" dJgOfg^  
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    'Array which will be populated with the list of files to be merged Kwmo)|7uPU  
    Dim fList() As String, curFile As String 1 jd=R7  
    GetFileList( cDir, fList ) ,}$x'8v  
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    Print "" !)1Zp*  
    Print "Files found for merging:" 9(\N+  
    For Each curFile In fList .ceU @^  
        Print Chr(9) & curFile {.[,ee-)9  
    Next N1zrfn-VU  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. @G&xq"Fg7  
    Dim nameArray() As String, sampName As String YV+dUvz  
    nameArray = Split(fList(0)," 0-0.txt") ~]s"PV:|  
    sampName  = nameArray(0) |0Ug~jKU  
    Print "" Nd!=3W5?  
    Print "Sample name: " & Chr(9) & sampName I>\?t4t  
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    'Open an output file and write the FRED header data n/
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    Dim outFile As String 6aK2{-+  
    outFile = cDir & sampName & "_FRED.txt" "PP0PL^5F  
    Open outFile For Output As #1 bao5^t}  
    Print #1, "type bsdf_data" ]fmfX  
    Print #1, "format angles=deg bsdf=value scale=1" z:? <aT  
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    'Loop the file list, skip the two header lines and write the remaining data to file Ya{1/AaM  
    Dim lineArray() As String, curLine As Long 3S21DC
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    For Each curFile In fList 9O_N iu0  
        Print "Merging data from file " & curFile .EELR]`y7I  
        ReadFile( cDir & curFile, lineArray ) _A~gqOe  
        For curLine = 2 To UBound(lineArray) yM~D.D3H  
            Print #1, lineArray(curLine) [~0q )  
        Next > %*X2'^  
    Next y.NArN|%  
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    'Close the output file !S}Au Mw  
    Close #1 pIjVJ9+j  
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    Print "Finished merging RPC data for sample " & sampName ,3[<C)'[  
    Print "FRED formatted data file: " & Chr(9) & outFile =)>q.R9  
End Sub ~#Mx&mZ  
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'Utility function to read the contents of a file into an array of strings. DN_C7\CoA  
Function ReadFile(ByVal fileName As String, _ S}I=i>QB  
                  ByRef lineArray() As String) As Long (NlEb'~+  
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    ReadFile = -1 >gl<$LQ?X  
    Dim oFSO As Object 0u9h2/ma  
    Set oFSO = CreateObject("Scripting.FileSystemObject") y=`(`|YW}`  
    Erase lineArray (pg9cM]NA  
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    Dim fid As Long (LPc\\Vv  
    If oFSO.fileexists( fileName ) Then 1#uw^{n  
        fid = FreeFile() ]jrxrUl  
        Open fileName For Input As fid 00TdX|V`  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) \mGM#E  
        Close fid 9D21e(7X  
    End If ApBThW*E  
    Set oFSO = Nothing 9^olAfX`dB  
    Return UBound( lineArray ) Xqw7lj;K  
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End Function K>6p5*&  
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Sub GetFileList( ByVal in_dir As String, _ boon=;{p  
                 ByRef in_flist() As String ) {P+[CO  
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    'Redimension the file list array 4Fq}*QJ-  
    Erase in_flist #+\G- =-  
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    'Tracks how many files are found SsZzYj.d  
    Dim fCount As Long _\[G7  
    fCount = 0 9m!fW|4  
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    'Recurse directory and search for text files {D#`+uw  
    Dim f As String xb\:H@92  
    f = Dir$(in_dir & "*.txt") q"oNB-bz  
    While f <> "" kRPg^Fw"Vw  
        ReDim Preserve in_flist(fCount) :Yqa[._AF  
        in_flist(fCount) = f 7L"/4w  
        fCount += 1 eW%jDsC  
        f = Dir$() vS#]RW&j  
    Wend 5K<C  
    ReDim Preserve in_flist(fCount-1) X;tk\Ixd  
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End Sub i2E7$[  
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