[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： :*I#n  
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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。 X3{G:H0\p  
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背景： Pr3qo4t.L  
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。 = I:.X ;  
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。 s]HOGJJz  
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步骤 &q3"g*q  
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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。 Q8T]\6)m  
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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） (jnQ -  
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 X.OD`.!>  
例如下所示： p)jk>j B  
Sample name:  EDF-C1-56 TITKj?*o  
Merging data from file EDF-C1-56 0-0.txt MDnKX?Y  
Finished merging RPC data for sample EDF-C1-56 )P%ZA)l%_o  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ?iw!OoZ`  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 6g2a[6G5  
a. 创建一个新的散射库 02f~En}>6  
b. 散射模型命名 gT3_RUF  
c. 改变散射模型为“Tabulated BSDF”. Vy6qbC-Kt  
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 ） 6@Y_*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。 6hw=  
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， oQLq&zRH`f  
g. 点击OK lAS#874dE  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 u__9Z:+  
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脚本代码： *M[?bk~~  
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'#Language "WWB-COM" NokU)O;x  
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Option Explicit DH[p\Wy'  
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Sub Main RU'=ERYC  
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    'Cleanup $3W;=Id=+  
    ClearOutputWindow() VEH&&@d  
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    Print "Merging RPC Photonics BSDF Data Files" `n.5f[wC  
    SetTextColor(255,0,0) |EIng0a  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." TCN8a/@z  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 61Bwb]\f/|  
    SetTextColor(0,0,0) .S!mf  
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    'Current directory of this script (should be the same as the text files being merged) Gk. ruQW"  
    Dim cDir As String &Q%zl9g(g  
    cDir = MacroDir$ & "\" BTlk Etm  
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    'Array which will be populated with the list of files to be merged c%^7!FSg  
    Dim fList() As String, curFile As String hjU::m,WX  
    GetFileList( cDir, fList ) }'5MK  
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    Print "" 5/q}`T9i%7  
    Print "Files found for merging:" i#&z2h-b  
    For Each curFile In fList \(3y7D  
        Print Chr(9) & curFile xN>npP   
    Next Htay-PB }  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. l3KVW5-!gS  
    Dim nameArray() As String, sampName As String dl.N.P7}4  
    nameArray = Split(fList(0)," 0-0.txt") P!~MZ+7#&  
    sampName  = nameArray(0) Yw22z #K  
    Print "" }wWKFX  
    Print "Sample name: " & Chr(9) & sampName tf=6\p  
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    'Open an output file and write the FRED header data Ot$-!Y;<  
    Dim outFile As String Qwz}B  
    outFile = cDir & sampName & "_FRED.txt" f& 0M*o,)  
    Open outFile For Output As #1 .0p0_f=  
    Print #1, "type bsdf_data" o=
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    Print #1, "format angles=deg bsdf=value scale=1" [NQOrcAQ  
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    'Loop the file list, skip the two header lines and write the remaining data to file ~{?_p@&n  
    Dim lineArray() As String, curLine As Long yID16
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    For Each curFile In fList Zvhsyz|  
        Print "Merging data from file " & curFile pny11C  
        ReadFile( cDir & curFile, lineArray ) `^91%f  
        For curLine = 2 To UBound(lineArray) V@\gS"Tu  
            Print #1, lineArray(curLine) Xk:OL,c  
        Next w _u\pa  
    Next g(nPQOs$u  
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    'Close the output file LU+3{O5y  
    Close #1 <i
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    Print "Finished merging RPC data for sample " & sampName Y4%:7mw~=  
    Print "FRED formatted data file: " & Chr(9) & outFile Pih tf4
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End Sub m9)p-1y@5  
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'Utility function to read the contents of a file into an array of strings. []x#iOnC&  
Function ReadFile(ByVal fileName As String, _ '#! gh?  
                  ByRef lineArray() As String) As Long +U:$(UV'A  
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    ReadFile = -1 )W|w C#  
    Dim oFSO As Object FK6[>(QO  
    Set oFSO = CreateObject("Scripting.FileSystemObject") Us%T;gW  
    Erase lineArray _t:$XJ`bTk  
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    Dim fid As Long zFfoqb#*g  
    If oFSO.fileexists( fileName ) Then agkA}O  
        fid = FreeFile() eD-#b|  
        Open fileName For Input As fid d[r#-h>dS  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) ]5BX:%  
        Close fid }{M#EP8q+  
    End If fz;iOjr>  
    Set oFSO = Nothing :#2Bw]z&z  
    Return UBound( lineArray ) :s=
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End Function R{RwTN<  
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Sub GetFileList( ByVal in_dir As String, _ :WQ^j!9'  
                 ByRef in_flist() As String ) ~a%Z;Aj  
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    'Redimension the file list array PiYY6i0  
    Erase in_flist l|xZk4@_uE  
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    'Tracks how many files are found {-
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    Dim fCount As Long hhb?6]Z/  
    fCount = 0 !GOM5z,  
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    'Recurse directory and search for text files )_a~} U]=.  
    Dim f As String Pf*^ZB%  
    f = Dir$(in_dir & "*.txt") `(T,+T4C5k  
    While f <> "" Tfh 2.  
        ReDim Preserve in_flist(fCount) AoY-\E  
        in_flist(fCount) = f Z1zVwHa_  
        fCount += 1 H|,Oswk~-  
        f = Dir$() 5>VY LI  
    Wend %R1tJ(/  
    ReDim Preserve in_flist(fCount-1) U QE qX  
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End Sub C?ulj9=Z  
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