[技术]RPC Photonics扩散片BSDF [复制链接]

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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。 8,!Oup  
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背景： /}L2LMIm  
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。 Q%d1n*;+  
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。 xb9+-{<J  
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步骤 "opMS/a"7  
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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。 Fr  
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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） 0*rD'?)K+  
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 +s"6[\H1d  
例如下所示： >,]8iMh  
Sample name:  EDF-C1-56 ]- `wXi"  
Merging data from file EDF-C1-56 0-0.txt }(ORh2Ri  
Finished merging RPC data for sample EDF-C1-56 * zyik[o  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt )rG4Nga5}  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 pxd=a!
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a. 创建一个新的散射库 d,JD
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b. 散射模型命名
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c. 改变散射模型为“Tabulated BSDF”. ja';NIO-  
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 ） ow3.jHsLA  
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。 y5m2u8+  
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， KbvMp1'9P  
g. 点击OK @CL#B98jl  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 g]2L[4  
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脚本代码：
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'#Language "WWB-COM" }>u `8'2v  
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Option Explicit %sr- xE  
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Sub Main '"\M`G  
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    'Cleanup |9c~kTjK  
    ClearOutputWindow() /]xa}{^B  
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    Print "Merging RPC Photonics BSDF Data Files" "yaxHd
 
    SetTextColor(255,0,0) tn5  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." crP2jF!  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." M }d:B)cz  
    SetTextColor(0,0,0) m3lz#Pm'0  
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    'Current directory of this script (should be the same as the text files being merged) $Xu3s~:S  
    Dim cDir As String - Fbp!*. u  
    cDir = MacroDir$ & "\" [c 8=b,EI  
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    'Array which will be populated with the list of files to be merged WxGD*%  
    Dim fList() As String, curFile As String hb5K"9Y  
    GetFileList( cDir, fList ) $El-pMq  
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    Print "" UPfO;Z`hJ  
    Print "Files found for merging:" vv @m{,7#Y  
    For Each curFile In fList -o6rY9\_!  
        Print Chr(9) & curFile 8I#ir4z#<  
    Next %
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. &oS$<  
    Dim nameArray() As String, sampName As String NFs5XpZ~  
    nameArray = Split(fList(0)," 0-0.txt") +JU, ^A#X  
    sampName  = nameArray(0) `S@TiD*  
    Print "" r<e%;S  
    Print "Sample name: " & Chr(9) & sampName St-uE|8  
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    'Open an output file and write the FRED header data Mn.,?IF`K  
    Dim outFile As String ~-BF7f6C  
    outFile = cDir & sampName & "_FRED.txt" a[O6xA%  
    Open outFile For Output As #1 neDXzMxF  
    Print #1, "type bsdf_data" JF
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    Print #1, "format angles=deg bsdf=value scale=1" B;1qy[  
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    'Loop the file list, skip the two header lines and write the remaining data to file C|$qVh>  
    Dim lineArray() As String, curLine As Long }Q/onBt  
    For Each curFile In fList :jLL IqhB  
        Print "Merging data from file " & curFile NXY jb(4:  
        ReadFile( cDir & curFile, lineArray ) 8vY-bm,e  
        For curLine = 2 To UBound(lineArray) DYD<?._I  
            Print #1, lineArray(curLine) V0\[|E;F  
        Next FM@iIlY"  
    Next Ic#xz;elM  
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    'Close the output file bV_nYpo  
    Close #1 #.bW9j/  
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    Print "Finished merging RPC data for sample " & sampName )u)=@@k21  
    Print "FRED formatted data file: " & Chr(9) & outFile ^/2I)y]W0  
End Sub =?fz-HB  
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'Utility function to read the contents of a file into an array of strings. C9n%!()>  
Function ReadFile(ByVal fileName As String, _ 7~/cz_  
                  ByRef lineArray() As String) As Long @w[i%F,&`  
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    ReadFile = -1 cj/`m$  
    Dim oFSO As Object \c=I!<9
 
    Set oFSO = CreateObject("Scripting.FileSystemObject") Ux[<g%F"  
    Erase lineArray gb ga"WO  
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    Dim fid As Long !_<6
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    If oFSO.fileexists( fileName ) Then IHl q27O  
        fid = FreeFile() tgK I
 
        Open fileName For Input As fid &],uD3:5O  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) "s*-dZO  
        Close fid vT'Bs;QR  
    End If yB*,)x0 @  
    Set oFSO = Nothing )+E[M!34  
    Return UBound( lineArray ) 0+1wi4wy/  
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End Function La26"C"X  
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Sub GetFileList( ByVal in_dir As String, _ _'u]{X\k{J  
                 ByRef in_flist() As String ) >:;dNVz  
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    'Redimension the file list array
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    Erase in_flist RpHlq  
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    'Tracks how many files are found \oQ]=dDCd%  
    Dim fCount As Long yBIlwN`kB  
    fCount = 0 5,RUPaE  

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    'Recurse directory and search for text files
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    Dim f As String mo0\t#jA  
    f = Dir$(in_dir & "*.txt") %\As  
    While f <> "" pm&THd  
        ReDim Preserve in_flist(fCount) lo1Ui`V  
        in_flist(fCount) = f }{aGh I~<  
        fCount += 1 h~MV=7 lE  
        f = Dir$() ${+u-Wfau  
    Wend .1x04Np!  
    ReDim Preserve in_flist(fCount-1) ])x1MmRg\  
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End Sub THA9OXP