[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： #K4*6LI  
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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。 64umul  
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背景： 4x=(Zw_X  
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。 Z!_n_Fk  
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。 0%#\w*X8  
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步骤 ||Y<f *  
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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。 jn=:G+0  
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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） [Y8S[YY  
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 t,<UohL|z  
例如下所示： i\Wdo/c-H  
Sample name:  EDF-C1-56 UQPU"F7.  
Merging data from file EDF-C1-56 0-0.txt Ej"u1F14J  
Finished merging RPC data for sample EDF-C1-56 x-;`-Uo%  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt !MV@) (.  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 suVmg-d  
a. 创建一个新的散射库 .<YcSG  
b. 散射模型命名  3+U]?7t  
c. 改变散射模型为“Tabulated BSDF”. Ll}yJ#3,  
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 ）
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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。 J=H)JH3  
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， H=~9CJ+tc  
g. 点击OK /tj$luls5  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 Ia4)uV8  
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脚本代码： /.Q4~Hw%}  
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'#Language "WWB-COM" 2*1ft>Uty  
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Option Explicit ^+/kr/  
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Sub Main r:g9Z_  
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    'Cleanup $k%Z$NSN=  
    ClearOutputWindow() $[ z y  
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    Print "Merging RPC Photonics BSDF Data Files" eUBrzoCO  
    SetTextColor(255,0,0) =.Tv)/ea  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." /,tAoa~FA  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." tef^ShF]  
    SetTextColor(0,0,0) Nn
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    'Current directory of this script (should be the same as the text files being merged) |yY`s6Uq  
    Dim cDir As String L%h/OD  
    cDir = MacroDir$ & "\" VaLs`q&3>  
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    'Array which will be populated with the list of files to be merged ~Xv=9@,h  
    Dim fList() As String, curFile As String bS!\#f%9"  
    GetFileList( cDir, fList ) zP)~a  
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    Print "" U[\Vj_?(I  
    Print "Files found for merging:" S#l5y%&  
    For Each curFile In fList K8[DZ)rO;Z  
        Print Chr(9) & curFile AkBMwV  
    Next @g-Tk
  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. q|(W-h+
 
    Dim nameArray() As String, sampName As String %,q.),F  
    nameArray = Split(fList(0)," 0-0.txt") `V!>J1x  
    sampName  = nameArray(0) B80aw>M  
    Print "" >U!*y4  
    Print "Sample name: " & Chr(9) & sampName } cNW^4F  
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    'Open an output file and write the FRED header data Jjm|9|C,  
    Dim outFile As String z\!K<d"Xv  
    outFile = cDir & sampName & "_FRED.txt" %D=]ZV](  
    Open outFile For Output As #1 ,xsH|xW  
    Print #1, "type bsdf_data" cj$6  
    Print #1, "format angles=deg bsdf=value scale=1" pdVQ*=c?M  
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    'Loop the file list, skip the two header lines and write the remaining data to file gP}+wbk  
    Dim lineArray() As String, curLine As Long :k=mzO<&  
    For Each curFile In fList xL "!~dN  
        Print "Merging data from file " & curFile ROb
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        ReadFile( cDir & curFile, lineArray ) 2N [=  
        For curLine = 2 To UBound(lineArray) ]0j9>s2|Z  
            Print #1, lineArray(curLine) X$n(-65  
        Next $'wq1u  
    Next i@P}{  
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    'Close the output file F7}-!  
    Close #1 6g:|*w  
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    Print "Finished merging RPC data for sample " & sampName `ldz`yu6++  
    Print "FRED formatted data file: " & Chr(9) & outFile {]N3f[w  
End Sub z8_XX$Mnt  
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'Utility function to read the contents of a file into an array of strings. {8RFK4! V@  
Function ReadFile(ByVal fileName As String, _ 0y#Ih {L  
                  ByRef lineArray() As String) As Long @'2m$a  
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    ReadFile = -1 8At<Wic  
    Dim oFSO As Object E,[xUz"  
    Set oFSO = CreateObject("Scripting.FileSystemObject") ]+Ixi o  
    Erase lineArray [:EvTY  
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    Dim fid As Long 2t#L:vY  
    If oFSO.fileexists( fileName ) Then eVh-_  
        fid = FreeFile() $iw%
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        Open fileName For Input As fid QO;4}rq  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) IVxWxM*N<  
        Close fid _.)eL3OF  
    End If rRFAD{5)  
    Set oFSO = Nothing =6nD sibf  
    Return UBound( lineArray ) dl]#
 
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End Function ed!>)Cb  
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Sub GetFileList( ByVal in_dir As String, _ UK[v6".^h  
                 ByRef in_flist() As String ) aptY6lGv-|  
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    'Redimension the file list array gXFWxT8S  
    Erase in_flist }?@5W,  
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    'Tracks how many files are found :;]Oc  
    Dim fCount As Long E2wz(,@  
    fCount = 0 y(jg#7)  
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    'Recurse directory and search for text files aBuoHdg;  
    Dim f As String [#^#+ |{\  
    f = Dir$(in_dir & "*.txt") G@ \Pi#1  
    While f <> "" "f.Z}AbP  
        ReDim Preserve in_flist(fCount) %q3$|>  
        in_flist(fCount) = f m:QG}{<.h  
        fCount += 1 256LHY|6  
        f = Dir$() "\%On >  
    Wend >p\e0n  
    ReDim Preserve in_flist(fCount-1) iI1n2>V3y  
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End Sub Y-!YhWsS  
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