[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： 7C2Xy>d~  
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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。 r4FSQ$[9w  
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背景： .y
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Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 gYho$E  
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。 L1lDDS#  
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步骤 (F;*@Z*R  
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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。 b[&ri
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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） ]_s;olKNI  
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 ZrP 8/>  
例如下所示： Y -BZV |  
Sample name:  EDF-C1-56 o^uh3,.  
Merging data from file EDF-C1-56 0-0.txt GdScYAC   
Finished merging RPC data for sample EDF-C1-56 [4;_8-[Nv  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Wvd-be  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 "E5=AWd  
a. 创建一个新的散射库 k=Wt57jt  
b. 散射模型命名 .,thdqOO  
c. 改变散射模型为“Tabulated BSDF”.
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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 ） [=-,i#4  
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。 DKlHXEt
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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， ga1b%5]v.  
g. 点击OK S:2 xm8 i  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 _Co v>6_i  
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脚本代码： 2l+'p[b0>  
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'#Language "WWB-COM" Pa; *%7  
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Option Explicit 9)b{U2&  
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Sub Main P4MP`A  
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    'Cleanup EO",|V-  
    ClearOutputWindow() '/ueY#eG  
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    Print "Merging RPC Photonics BSDF Data Files" x41t=E](  
    SetTextColor(255,0,0) *D7oHwDU  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." HW6Cz>WxOW  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." -%VFC^'5  
    SetTextColor(0,0,0) [ifQLsHA  
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    'Current directory of this script (should be the same as the text files being merged) m|Z[8Tup  
    Dim cDir As String oY@]&A^ah  
    cDir = MacroDir$ & "\" 1Ji"z>H*  
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    'Array which will be populated with the list of files to be merged ,=%c e  
    Dim fList() As String, curFile As String I= z+`o8  
    GetFileList( cDir, fList ) 9FT=
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    Print "" x||b:2  
    Print "Files found for merging:" QX-M'ur99  
    For Each curFile In fList ,.gI'YPQC  
        Print Chr(9) & curFile fG7-0
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    Next F<6{$YI  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. n;dWb$:  
    Dim nameArray() As String, sampName As String ,6
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    nameArray = Split(fList(0)," 0-0.txt") .9!&x0;  
    sampName  = nameArray(0) f K4M:_u  
    Print "" m]\d9%-AT&  
    Print "Sample name: " & Chr(9) & sampName OBPiLCq  
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    'Open an output file and write the FRED header data 1[dQVJqMp(  
    Dim outFile As String %cMayCaI!@  
    outFile = cDir & sampName & "_FRED.txt" AkqGk5e ^  
    Open outFile For Output As #1 /z(s1G.  
    Print #1, "type bsdf_data" qSVg.<+   
    Print #1, "format angles=deg bsdf=value scale=1" <DdzDbgax  
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    'Loop the file list, skip the two header lines and write the remaining data to file z<<aT  
    Dim lineArray() As String, curLine As Long dnX^?  
    For Each curFile In fList gm&O-N"=U  
        Print "Merging data from file " & curFile jmnrpXaAx  
        ReadFile( cDir & curFile, lineArray ) X`daaG_l  
        For curLine = 2 To UBound(lineArray) [  **F  
            Print #1, lineArray(curLine) yj`xOncE}  
        Next 0k|/]zfb  
    Next CwfGp[|}e  
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    'Close the output file -(.\> F  
    Close #1 <=~'Pd-f(  
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    Print "Finished merging RPC data for sample " & sampName `JG7Pl/ih  
    Print "FRED formatted data file: " & Chr(9) & outFile O`(it%Ho!  
End Sub 7)3cq}]O  
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'Utility function to read the contents of a file into an array of strings. [k6,!e[/uG  
Function ReadFile(ByVal fileName As String, _ C)s*1@af  
                  ByRef lineArray() As String) As Long ["?WVXCF8|  
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    ReadFile = -1 $S!WW|9j.  
    Dim oFSO As Object `_+m3vHG  
    Set oFSO = CreateObject("Scripting.FileSystemObject") X`n*M]  
    Erase lineArray ~f%AbDye  
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    Dim fid As Long $L$GI~w/  
    If oFSO.fileexists( fileName ) Then evGUSol?:n  
        fid = FreeFile() ,}42]%$G  
        Open fileName For Input As fid \A3yM{G~+  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) T]J#>LBd  
        Close fid &@xeWB  
    End If Hz<)a(r!J  
    Set oFSO = Nothing nnO@$
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    Return UBound( lineArray ) m4@w M?
 
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End Function `<l|XPv  
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Sub GetFileList( ByVal in_dir As String, _ -`ykVHgg  
                 ByRef in_flist() As String ) ^l/$ 13=  
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    'Redimension the file list array oWc +i U(  
    Erase in_flist 84dej<  
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    'Tracks how many files are found :WnXoL  
    Dim fCount As Long V_7xXuM/  
    fCount = 0 <ByDT$E_  
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    'Recurse directory and search for text files 8M'6Kcr  
    Dim f As String `Lu\zR%<  
    f = Dir$(in_dir & "*.txt") !bCLi>8  
    While f <> "" yo0?QRT  
        ReDim Preserve in_flist(fCount) :O}<Q  
        in_flist(fCount) = f I2=Kq{  
        fCount += 1 {n%U2LVL  
        f = Dir$() 9qQFIw~S  
    Wend s2ys>2k  
    ReDim Preserve in_flist(fCount-1) H{T)?J~  
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End Sub *ha9Vq@X  
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