[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： #z(]xI)"  
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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。 {_}I!`opr$  
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背景： gr{ DWCK  
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。 gIfh3D=yX  
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。 {vj)76%y  
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步骤 "7 yD0T)2  
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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。 DDZ@$L!  
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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） m~|40)   
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 RFGff
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例如下所示： @iiT
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Sample name:  EDF-C1-56 +_!QSU,@  
Merging data from file EDF-C1-56 0-0.txt @W<m4fi  
Finished merging RPC data for sample EDF-C1-56 VUc%4U{Cti  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt RCrCs  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 =M1I>  
a. 创建一个新的散射库 B?QIN]  
b. 散射模型命名 #mT"gs  
c. 改变散射模型为“Tabulated BSDF”. UG^q9 :t  
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 ） Iv *<La  
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。 "Q<MS'a  
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， S/ *E,))m  
g. 点击OK )BE1Q*= n  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 SM'|+ d  
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脚本代码： b>|6t~}M  
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'#Language "WWB-COM" .`lCWeHN  
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Option Explicit u, ff>/1  
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Sub Main | Iib|HQ)  
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    'Cleanup ZNoDFf*h  
    ClearOutputWindow() Q8NX)R  
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    Print "Merging RPC Photonics BSDF Data Files" Hz~zu{;{J  
    SetTextColor(255,0,0) :h$$J lP  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." KXy6Eno  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." *hx  
    SetTextColor(0,0,0) .8R@2c`}Cs  
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    'Current directory of this script (should be the same as the text files being merged) ]lbuy7xj63  
    Dim cDir As String b-DvW4B  
    cDir = MacroDir$ & "\" -"`=1l  
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    'Array which will be populated with the list of files to be merged 3<!7>]A  
    Dim fList() As String, curFile As String h\o.&6sd  
    GetFileList( cDir, fList ) bsX[UF
  
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    Print "" %{|pj +  
    Print "Files found for merging:" ?}0,o.  
    For Each curFile In fList KwS@D9bok  
        Print Chr(9) & curFile .3;;;K9a~]  
    Next vt8By@]:  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. X, n:,'  
    Dim nameArray() As String, sampName As String JI}'dU>*U:  
    nameArray = Split(fList(0)," 0-0.txt") Pal=F0-Q\  
    sampName  = nameArray(0) \85i+q:LuA  
    Print ""  )2.Si#  
    Print "Sample name: " & Chr(9) & sampName
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    'Open an output file and write the FRED header data +whDU2 "  
    Dim outFile As String Tbq;h?D  
    outFile = cDir & sampName & "_FRED.txt" Upe%r
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    Open outFile For Output As #1 KPF1cJ2N  
    Print #1, "type bsdf_data" !a`&O-ye  
    Print #1, "format angles=deg bsdf=value scale=1" T[gv0|+  
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    'Loop the file list, skip the two header lines and write the remaining data to file ";F'~}bDA  
    Dim lineArray() As String, curLine As Long aOp\91  
    For Each curFile In fList G
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        Print "Merging data from file " & curFile Dtk=[;"k2a  
        ReadFile( cDir & curFile, lineArray ) S'" Df5  
        For curLine = 2 To UBound(lineArray) C]6O!Pb0  
            Print #1, lineArray(curLine) Vksuu@cch  
        Next "sTRS*  
    Next AH^/V}9H  
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    'Close the output file ^c|/*u  
    Close #1 kmW4:EA%  
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    Print "Finished merging RPC data for sample " & sampName d=(mw_-
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    Print "FRED formatted data file: " & Chr(9) & outFile *w&e\i|7  
End Sub ,bi^P>X  
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'Utility function to read the contents of a file into an array of strings. zPO9!?7|  
Function ReadFile(ByVal fileName As String, _ HN"Z]/5j  
                  ByRef lineArray() As String) As Long F5<Hm_\:  
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    ReadFile = -1 KO [Yi  
    Dim oFSO As Object ]M=&+c>H~  
    Set oFSO = CreateObject("Scripting.FileSystemObject") )5,v!X)  
    Erase lineArray a(nlTMfu  
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    Dim fid As Long dV_G1'  
    If oFSO.fileexists( fileName ) Then `?]k{ l1R  
        fid = FreeFile() ye&;(30Oq  
        Open fileName For Input As fid kVgTGC"L=  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) CJY$G}rk  
        Close fid P:c w|Q  
    End If Ml_^ `vn  
    Set oFSO = Nothing ?s01@f#  
    Return UBound( lineArray ) uRvP hkqm  
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End Function [n@] r2g)3  
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Sub GetFileList( ByVal in_dir As String, _ _6Sp QW  
                 ByRef in_flist() As String ) (`^1Y3&2  
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    'Redimension the file list array (.:e,l{U%  
    Erase in_flist V[LglPt  
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    'Tracks how many files are found h p1Bi  
    Dim fCount As Long A.SvA Yn  
    fCount = 0 ?<!|  
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    'Recurse directory and search for text files `Di{}/2  
    Dim f As String KlEpzJ98  
    f = Dir$(in_dir & "*.txt") N2G{<>=  
    While f <> "" i!Ba]n   
        ReDim Preserve in_flist(fCount) >4TO=i  
        in_flist(fCount) = f /~1+i'7V.,  
        fCount += 1 )~>YH*g  
        f = Dir$() 3o*YzwRt  
    Wend &ZO0r ^  
    ReDim Preserve in_flist(fCount-1) '1[Ft03  
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End Sub pa+hL,w{6  
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