[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： LRL,m_gt  
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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。 h`^jyoF"(  
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背景： T&6l$1J  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 H?yK~bGQ  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 %)1y AdG 8  
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步骤 (A9Fhun  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 xF!,IKlBBp  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） f6hnTbJ  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 d,k!qjf=r  
例如下所示： (ZUHvvL  
Sample name:  EDF-C1-56 lXW%FH6c+  
Merging data from file EDF-C1-56 0-0.txt NG+GEqx  
Finished merging RPC data for sample EDF-C1-56 ]L5@,E4.  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt y%"{I7
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4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 11Q1AN  
a. 创建一个新的散射库 SW@$ci  
b. 散射模型命名 (KjoSN( K  
c. 改变散射模型为“Tabulated BSDF”. xQ7l~O b  
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 ） n(1l}TJy  
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。 luh$2 \5B  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， G#ZH.24Y  
g. 点击OK #NEE7'&S  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 "q3ZWNS'w  
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脚本代码： zu_8># i-  
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'#Language "WWB-COM" Ri<u/ ]oR"  
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Option Explicit ejS
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Sub Main I ce~oz)  
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    'Cleanup .]8ZwAs=&  
    ClearOutputWindow() zfJ
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    Print "Merging RPC Photonics BSDF Data Files" /C
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    SetTextColor(255,0,0) qqjwJ!@P  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." is?{MJZ_  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ?g_3 [Fk  
    SetTextColor(0,0,0) OIGY`   
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    'Current directory of this script (should be the same as the text files being merged) G<L;4nA)  
    Dim cDir As String HY56"LZ$(}  
    cDir = MacroDir$ & "\" E^B'4  
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    'Array which will be populated with the list of files to be merged g@d*\ P)  
    Dim fList() As String, curFile As String Yj&F;_~  
    GetFileList( cDir, fList ) u+9hL4  
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    Print "" .yoH/2h  
    Print "Files found for merging:" Akq2 d;  
    For Each curFile In fList )*u8/U  
        Print Chr(9) & curFile 1.}d.t  
    Next {a =#B)6  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. s n8Qk=K  
    Dim nameArray() As String, sampName As String &)Q
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    nameArray = Split(fList(0)," 0-0.txt") em
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    sampName  = nameArray(0) ))qy;Q,  
    Print "" esJ~;~[@(r  
    Print "Sample name: " & Chr(9) & sampName l|u>Tb|V  
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    'Open an output file and write the FRED header data b!+hH Hv:  
    Dim outFile As String Z3Og=XHR  
    outFile = cDir & sampName & "_FRED.txt" 0-B5`=yU  
    Open outFile For Output As #1 d9k0F OR1  
    Print #1, "type bsdf_data" ><4<yj1  
    Print #1, "format angles=deg bsdf=value scale=1" lqy Qf$t  
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    'Loop the file list, skip the two header lines and write the remaining data to file ,<.V7(|t)  
    Dim lineArray() As String, curLine As Long @="Pn5<]C  
    For Each curFile In fList ,>:U2%  
        Print "Merging data from file " & curFile |NlO7aQ>2H  
        ReadFile( cDir & curFile, lineArray ) :@yEQ#nFp  
        For curLine = 2 To UBound(lineArray) [|v][Hwv  
            Print #1, lineArray(curLine) (|2t#'m  
        Next kj Jn2c:y  
    Next QL(n} {.%  
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    'Close the output file gM&{=WDG6  
    Close #1 Usvl}{L[  
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    Print "Finished merging RPC data for sample " & sampName T9=I$@/  
    Print "FRED formatted data file: " & Chr(9) & outFile <NMEGit  
End Sub #`^}PuQ  
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'Utility function to read the contents of a file into an array of strings. MxKS4k  
Function ReadFile(ByVal fileName As String, _ "MeVE#O  
                  ByRef lineArray() As String) As Long `>o{P/HN  
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    ReadFile = -1 9+|$$)  
    Dim oFSO As Object 
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    Set oFSO = CreateObject("Scripting.FileSystemObject") $t+,Tav  
    Erase lineArray
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    Dim fid As Long #mxPw  
    If oFSO.fileexists( fileName ) Then cZ,b?I"Q%  
        fid = FreeFile() !
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        Open fileName For Input As fid ROI7eU  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 2Ah#<k-gC;  
        Close fid &C_j\7Dq  
    End If g _9C*  
    Set oFSO = Nothing AI2)g1m  
    Return UBound( lineArray ) hPB9@hT$  
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End Function h
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Sub GetFileList( ByVal in_dir As String, _ M/f<A$xx_  
                 ByRef in_flist() As String ) E_rI?t^  
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    'Redimension the file list array q1x`Bj  
    Erase in_flist zpn9,,~u  
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    'Tracks how many files are found h,:m~0gmj  
    Dim fCount As Long LBeF&sb6  
    fCount = 0 |d2SIyUc  
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    'Recurse directory and search for text files (XTG8W sN  
    Dim f As String >Er|Jxy  
    f = Dir$(in_dir & "*.txt") ;?Tbnn Wn  
    While f <> "" z_$%-6  
        ReDim Preserve in_flist(fCount) |l^uEtG  
        in_flist(fCount) = f ,_ H:J.ik  
        fCount += 1 :LQYo'@yB  
        f = Dir$() {lzWrUGO  
    Wend EU 6oQ  
    ReDim Preserve in_flist(fCount-1) Wtd/=gmiI  
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End Sub Pbn*
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