[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： <EPj$::  
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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。 !:|TdYrmj  
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背景： B;R.#^@/  
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。 zUkN 0  
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。 $={:r/R`i  
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步骤 "jTKSgv+q5  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 Dfps gY)/?  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） h Ggx  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 <'fdkW  
例如下所示： qOSg!aft{Q  
Sample name:  EDF-C1-56 @g2
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Merging data from file EDF-C1-56 0-0.txt KhCzD[tf  
Finished merging RPC data for sample EDF-C1-56 2pzF5h  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt `(
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4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 #6AFdNy  
a. 创建一个新的散射库 {r>.G7P6  
b. 散射模型命名  )LJnLo+  
c. 改变散射模型为“Tabulated BSDF”. yu6`66h)  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） f6_];]yP  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 Nc:({@I  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， ;w6>"O$a  
g. 点击OK Sr&515  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 P6 ;'Sza  
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脚本代码： Yk'9U-.mc  
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'#Language "WWB-COM" c&X{dJWD  
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Option Explicit UK$ms~H  
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Sub Main K,6b3kk  
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    'Cleanup
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    ClearOutputWindow() e
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    Print "Merging RPC Photonics BSDF Data Files" s0*0 'f  
    SetTextColor(255,0,0) EyI}{6~F  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." cXR1grz  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." rwniOQe  
    SetTextColor(0,0,0) ~`GhS<D  
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    'Current directory of this script (should be the same as the text files being merged) YAL=!~6  
    Dim cDir As String ed!:/+3e/  
    cDir = MacroDir$ & "\" &O)
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    'Array which will be populated with the list of files to be merged d\H&dkpH  
    Dim fList() As String, curFile As String yMZHUd  
    GetFileList( cDir, fList ) PN$X N<  
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    Print "" '
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    Print "Files found for merging:" T1`|~Z?g-  
    For Each curFile In fList ( 7ws{)  
        Print Chr(9) & curFile 8 F2|  
    Next #Ei,(xiP  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. iJv48#'ii  
    Dim nameArray() As String, sampName As String FVB;\'/  
    nameArray = Split(fList(0)," 0-0.txt") ;uqx@sx ;  
    sampName  = nameArray(0) Uz608u  
    Print "" zf.-I  
    Print "Sample name: " & Chr(9) & sampName hKNY+S})g  
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    'Open an output file and write the FRED header data xq%{}  
    Dim outFile As String !mRx$ %ul  
    outFile = cDir & sampName & "_FRED.txt" N7%TYs  
    Open outFile For Output As #1 M wab!Ya  
    Print #1, "type bsdf_data" Y4F6qyP)"  
    Print #1, "format angles=deg bsdf=value scale=1" -ZW3  
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    'Loop the file list, skip the two header lines and write the remaining data to file >sD4R}\})  
    Dim lineArray() As String, curLine As Long 1AHx"e,;L  
    For Each curFile In fList RGIoI]_  
        Print "Merging data from file " & curFile KECElK3uj  
        ReadFile( cDir & curFile, lineArray ) Nw
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        For curLine = 2 To UBound(lineArray) v)f7};"z   
            Print #1, lineArray(curLine) RA],lNs  
        Next J9%@VZut  
    Next v8/6wy?  
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    'Close the output file C#i UP|7hh  
    Close #1 w?mEuXc  
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    Print "Finished merging RPC data for sample " & sampName (X+s-4%  
    Print "FRED formatted data file: " & Chr(9) & outFile xMs]Hs  
End Sub J4tcQ  
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'Utility function to read the contents of a file into an array of strings. r]P,9  
Function ReadFile(ByVal fileName As String, _ =q(GHg;'  
                  ByRef lineArray() As String) As Long ~u&|G$1!0  
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    ReadFile = -1 4'Xgk
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    Dim oFSO As Object 8BXqZVm.  
    Set oFSO = CreateObject("Scripting.FileSystemObject") RGD
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    Erase lineArray m-V02's  
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    Dim fid As Long Y'`"9Db  
    If oFSO.fileexists( fileName ) Then V%CUMH =U  
        fid = FreeFile() Ybg-"w  
        Open fileName For Input As fid oc{EuW{Ag  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) !EF(*~r!9L  
        Close fid ]Z4zF"@  
    End If rrs"N3!aT  
    Set oFSO = Nothing ,Vd7V}t  
    Return UBound( lineArray ) T~gW3J  
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End Function 8cm@a*2%  
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Sub GetFileList( ByVal in_dir As String, _ O\OE0[[
 
                 ByRef in_flist() As String ) Bmo
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    'Redimension the file list array ~ eN8|SR  
    Erase in_flist NvtM3  
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    'Tracks how many files are found :DkAQ-<~  
    Dim fCount As Long qJ8-9^E,L  
    fCount = 0 |G=[5e^s[  
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    'Recurse directory and search for text files PI|`vC|yy&  
    Dim f As String h ?#@~  
    f = Dir$(in_dir & "*.txt") Xt,X_o2m|]  
    While f <> ""  ?RD *1  
        ReDim Preserve in_flist(fCount) (paf2F
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        in_flist(fCount) = f ])y{BlZ  
        fCount += 1 IS]{}Y\3H  
        f = Dir$() .Gb+\E{M  
    Wend ;?IT)sNY  
    ReDim Preserve in_flist(fCount-1) j%& IL0  
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End Sub i(HByI  
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