[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： BCrX>Pp}r  
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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。 =th(Hdk17  
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背景： Nb[zm|.  
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。 +Wr"c  
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。 Sr9)i8x{  
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步骤 ZQ&A'(tt4  
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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。 f3g#(1  
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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） 

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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 /b44;U`v5-  
例如下所示： ?u*gKI  
Sample name:  EDF-C1-56 1XwW4cZ>:  
Merging data from file EDF-C1-56 0-0.txt *{ =5AW}o  
Finished merging RPC data for sample EDF-C1-56 0n'~wz"wB  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt TA x
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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 NXJyRAJ*%  
a. 创建一个新的散射库 "0,d)L0,"  
b. 散射模型命名 x_C#ALq9  
c. 改变散射模型为“Tabulated BSDF”. li U=&wM>  
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 ） m|7lDfpb  
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。 !I7bxDzK$  
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， /Ir|& <yB  
g. 点击OK 
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5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 I6k S1  
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脚本代码： jK!Y-  
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'#Language "WWB-COM" r35'U#VMk?  
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Option Explicit (Wj2%*NT  
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Sub Main 8Wa&&YTB  
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    'Cleanup {3jV ,S  
    ClearOutputWindow() #Cw
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    Print "Merging RPC Photonics BSDF Data Files" &TpzJcd"  
    SetTextColor(255,0,0) h-^7cHI}  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." B\/"$"
 
    Print "Note: Do not run this script multiple times without deleting the output file between executions." d%"?^e  
    SetTextColor(0,0,0) ?=UIx24W  
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    'Current directory of this script (should be the same as the text files being merged) UUzu`>upB  
    Dim cDir As String z3RlD"F1  
    cDir = MacroDir$ & "\" np>RxiB^  
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    'Array which will be populated with the list of files to be merged v}$s,j3NO  
    Dim fList() As String, curFile As String v(HCnC  
    GetFileList( cDir, fList ) dHcGe{T^(  
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    Print "" ]h Dy]  
    Print "Files found for merging:" c:a5pd7T  
    For Each curFile In fList Esc*+}ck  
        Print Chr(9) & curFile jq4'=L$4  
    Next 2EHe
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. D^E+#a 1  
    Dim nameArray() As String, sampName As String l c<&f  
    nameArray = Split(fList(0)," 0-0.txt") 8?n6
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    sampName  = nameArray(0) 80/6-_g(  
    Print "" 0(uNFyIG  
    Print "Sample name: " & Chr(9) & sampName R*C  
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    'Open an output file and write the FRED header data tRqg')y  
    Dim outFile As String Jb~nu  
    outFile = cDir & sampName & "_FRED.txt" )u. ut8![T  
    Open outFile For Output As #1 `7;I*|  
    Print #1, "type bsdf_data" *-!&5~o/U  
    Print #1, "format angles=deg bsdf=value scale=1" \2rC
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    'Loop the file list, skip the two header lines and write the remaining data to file .kBZ(`K  
    Dim lineArray() As String, curLine As Long &DqeO8?Q  
    For Each curFile In fList G4jaHpPi  
        Print "Merging data from file " & curFile UUxDW3K  
        ReadFile( cDir & curFile, lineArray ) \XG18V&  
        For curLine = 2 To UBound(lineArray) x*)@:W!  
            Print #1, lineArray(curLine) iNTw;ov  
        Next +sTZ) 5vQ  
    Next zH0{S.3k  
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    'Close the output file 6j]pJ]F6  
    Close #1 V9v80e {n4  
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    Print "Finished merging RPC data for sample " & sampName }tH$/-qnJE  
    Print "FRED formatted data file: " & Chr(9) & outFile {y{&tzZ  
End Sub xK`.^W  
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'Utility function to read the contents of a file into an array of strings. LnN6{z{M  
Function ReadFile(ByVal fileName As String, _ 
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                  ByRef lineArray() As String) As Long ;tS4h  
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    ReadFile = -1 hM!D6: t  
    Dim oFSO As Object EDm,Y  
    Set oFSO = CreateObject("Scripting.FileSystemObject") sK#)wjj\^  
    Erase lineArray htn"rY(  
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    Dim fid As Long 6%mFiX  
    If oFSO.fileexists( fileName ) Then t~xp&LQiY  
        fid = FreeFile() yDt3)fP#  
        Open fileName For Input As fid [Z3B~c  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) zc QFIP  
        Close fid \O"EK~x}/  
    End If 4{d`-reHg  
    Set oFSO = Nothing B}= WxG|)  
    Return UBound( lineArray ) H3=U|wr|  
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End Function p;S<WJv k  
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Sub GetFileList( ByVal in_dir As String, _ #+2|ZfCn%  
                 ByRef in_flist() As String ) /f!CX|U  
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    'Redimension the file list array M<3P  
    Erase in_flist g-c\;  
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    'Tracks how many files are found yNk9KK)  
    Dim fCount As Long v3(W4G`  
    fCount = 0 <y+8\m  
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    'Recurse directory and search for text files aqTMOWyeu  
    Dim f As String O87Ptr8  
    f = Dir$(in_dir & "*.txt") ^Zh YW  
    While f <> "" &n% 3rC5{  
        ReDim Preserve in_flist(fCount) kan?2x  
        in_flist(fCount) = f ;cBFft}D  
        fCount += 1 LbGyD;#_  
        f = Dir$() +jcg[|-'/  
    Wend U>^u!1X  
    ReDim Preserve in_flist(fCount-1) Z8\c'xN  
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End Sub Qh)QdW4  
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