[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： $P
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RPC Photonics公司有高品质的的工程漫射体BSDF测试数据，但它对于FRED帮助甚少，下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件，并将数据直接应用到FRED的Tabulated scatter 散射模型。 P4F3D
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背景： +[R/=$  
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。 awOd_![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。 %_(H{y_!  
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步骤 {2+L@  
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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。 +\|Iu;w  
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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 -,+q#F  
例如下所示： h-m\%|D  
Sample name:  EDF-C1-56 :^fcC[$K  
Merging data from file EDF-C1-56 0-0.txt raCi 8  
Finished merging RPC data for sample EDF-C1-56 E6,4RuCK  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt s.x&LG  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 GD:4"$)[o  
a. 创建一个新的散射库 n#:N;T;\a  
b. 散射模型命名 EloMe~a3  
c. 改变散射模型为“Tabulated BSDF”. .'rW.'Ft  
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 ） TzntO9P+  
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。 H.WE6  
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， Z-U-N  
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 ph_4q@  
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脚本代码： .p=sBLp8  
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'#Language "WWB-COM" -CR?<A4mud  
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Option Explicit S_T1y  
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Sub Main z9p05NFH  
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    'Cleanup 2{Chu85   
    ClearOutputWindow() (C\hVy2X?N  
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    Print "Merging RPC Photonics BSDF Data Files" 
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    SetTextColor(255,0,0) p<&Xd}]"^W  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." Ik[s  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 1=nUW":  
    SetTextColor(0,0,0) rC7``#5  
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    'Current directory of this script (should be the same as the text files being merged) (^5 7UmFv]  
    Dim cDir As String sU"}-de  
    cDir = MacroDir$ & "\" \y88d4zX  
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    'Array which will be populated with the list of files to be merged 1t
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    Dim fList() As String, curFile As String nD0}wiL{  
    GetFileList( cDir, fList ) [F*4EGB  
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    Print "" L3p`  
    Print "Files found for merging:" DEw8*MN  
    For Each curFile In fList D!oc>K$B  
        Print Chr(9) & curFile &%2*Wu;  
    Next ; h`0ir4[A  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. b:(-  
    Dim nameArray() As String, sampName As String C'!;J  
    nameArray = Split(fList(0)," 0-0.txt") 0}:2Q#  
    sampName  = nameArray(0) c=;:R0_'t  
    Print "" -wv6s#"u  
    Print "Sample name: " & Chr(9) & sampName yg2uC(2  
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    'Open an output file and write the FRED header data 6MG9a>=  
    Dim outFile As String qTB$`f'|$  
    outFile = cDir & sampName & "_FRED.txt" ooj~&fu  
    Open outFile For Output As #1 mCz,2K|^~  
    Print #1, "type bsdf_data" 'i8U  
    Print #1, "format angles=deg bsdf=value scale=1" ';G1A  
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    'Loop the file list, skip the two header lines and write the remaining data to file  8*c3|  
    Dim lineArray() As String, curLine As Long D&ve15wL  
    For Each curFile In fList ZO7&vF}  
        Print "Merging data from file " & curFile ]=EM@  
        ReadFile( cDir & curFile, lineArray ) J@L9p46,  
        For curLine = 2 To UBound(lineArray) {&[9iIf  
            Print #1, lineArray(curLine) jhGlG-^  
        Next BYM3jXWi0v  
    Next id?#TqD  
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    'Close the output file npD
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    Close #1 T'#!~GpB  
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    Print "Finished merging RPC data for sample " & sampName 7$k8%lI;>  
    Print "FRED formatted data file: " & Chr(9) & outFile Y=*P 8pg  
End Sub f&x0@Q/eON  
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'Utility function to read the contents of a file into an array of strings. 9]>iSG^H  
Function ReadFile(ByVal fileName As String, _ .la&P,j_L  
                  ByRef lineArray() As String) As Long AY SSa 1}  
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    ReadFile = -1 8yWoPm<A  
    Dim oFSO As Object )ZejQ}$  
    Set oFSO = CreateObject("Scripting.FileSystemObject") ;50_0Mv;(:  
    Erase lineArray kzq29S  
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    Dim fid As Long U
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    If oFSO.fileexists( fileName ) Then l12$l<x&M  
        fid = FreeFile() jko"MfJ  
        Open fileName For Input As fid ?`zgq>R}w[  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) H<ZU#U0FZf  
        Close fid RiO="tX'  
    End If Dz_eB"}  
    Set oFSO = Nothing fA! 6sB  
    Return UBound( lineArray ) ~~8rI[/  
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End Function gor<g))\  
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Sub GetFileList( ByVal in_dir As String, _ ze'.Y%]  
                 ByRef in_flist() As String ) NNa1EXZ[  
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    'Redimension the file list array ACjf\4Q  
    Erase in_flist \h3e-)  
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    'Tracks how many files are found HXJ9xkrr  
    Dim fCount As Long 3]n0 &MZAR  
    fCount = 0 \,sg)^w@  
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    'Recurse directory and search for text files >Jm"2U}lZW  
    Dim f As String TRKgBK$,  
    f = Dir$(in_dir & "*.txt") Z,WW]Y,$  
    While f <> "" +#]|)VZ  
        ReDim Preserve in_flist(fCount)
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        in_flist(fCount) = f ~4)Y#IxL  
        fCount += 1 i~&c|  
        f = Dir$() ^p_u.P  
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    ReDim Preserve in_flist(fCount-1) (:Cc3  
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End Sub !%mi&ak(Rn  
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