[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： B||c(ue  
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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。 F<r4CHfh;  
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背景： @HEPc95  
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。 YMu)  
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。 v@_in(dk  
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步骤 g1qi\axm  
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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。 h{/ve`F>@  
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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） B01^oYM}  
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 3bts7<K=  
例如下所示： k4R4YI"jV  
Sample name:  EDF-C1-56 M(5D'4.  
Merging data from file EDF-C1-56 0-0.txt h5
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Finished merging RPC data for sample EDF-C1-56 -+P7:4/  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt mV zu~xym  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 $ !5f"<FCB  
a. 创建一个新的散射库 <E}N=J
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b. 散射模型命名 GCH[lb>IJv  
c. 改变散射模型为“Tabulated BSDF”. .,mM%w,^O  
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 ） \7 Mq $d  
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。 g7Z9F[d  
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， o<J5!  
g. 点击OK *w 21U!  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 rIlBH*aT  
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脚本代码： %MuaW(I o  
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'#Language "WWB-COM" (}0S1)7t  
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Option Explicit 7TdQRB  
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Sub Main [<Jp#&u6sb  
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    'Cleanup R&!]Rl9hf  
    ClearOutputWindow() UoRDeYQ`E  
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    Print "Merging RPC Photonics BSDF Data Files" pK"&QPv  
    SetTextColor(255,0,0) 8KKz5\kn7  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." f9F2U )  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." X<FOn7qf  
    SetTextColor(0,0,0) YZ\@)D;  
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    'Current directory of this script (should be the same as the text files being merged) ~oFh>9u  
    Dim cDir As String hr1$1&p  
    cDir = MacroDir$ & "\" kp; &cQu!  
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    'Array which will be populated with the list of files to be merged j"6:A  
    Dim fList() As String, curFile As String P5
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    GetFileList( cDir, fList ) 3W'FcE)|E  
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    Print "" ^Po,(iIn  
    Print "Files found for merging:" ZM 8U]0[X  
    For Each curFile In fList 6Ty3e|do  
        Print Chr(9) & curFile {\Ys@FF  
    Next Z>h{` X\2  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. CPGL!:  
    Dim nameArray() As String, sampName As String 952V@.Zp  
    nameArray = Split(fList(0)," 0-0.txt") j%u8=  
    sampName  = nameArray(0) ZR6&AiL(Bj  
    Print "" _G[6+g5|  
    Print "Sample name: " & Chr(9) & sampName Pv[ykrm/  
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    'Open an output file and write the FRED header data vlAy!:CV  
    Dim outFile As String }{t3SGsJ  
    outFile = cDir & sampName & "_FRED.txt" <b'1#Pd>0  
    Open outFile For Output As #1 N5ci};?  
    Print #1, "type bsdf_data" FSe5k5  
    Print #1, "format angles=deg bsdf=value scale=1" ( mt*y]p?  
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    'Loop the file list, skip the two header lines and write the remaining data to file cTy'JT7  
    Dim lineArray() As String, curLine As Long F#KF6)P  
    For Each curFile In fList j^{b^!4~}  
        Print "Merging data from file " & curFile s"N\82z)  
        ReadFile( cDir & curFile, lineArray ) \eT/%$  
        For curLine = 2 To UBound(lineArray) L, #Byao  
            Print #1, lineArray(curLine) cPSti  
        Next "G@E6{/  
    Next EFD?di)s  
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    'Close the output file hu&n=6  
    Close #1 ~9bv Wd1D  
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    Print "Finished merging RPC data for sample " & sampName <a fO 6?`  
    Print "FRED formatted data file: " & Chr(9) & outFile <ipWMZae0F  
End Sub {H'X)n$  
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'Utility function to read the contents of a file into an array of strings. eq{ [?/  
Function ReadFile(ByVal fileName As String, _ lj Y  
                  ByRef lineArray() As String) As Long !9PX\Xbn  
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    ReadFile = -1 vv!Bo~L1,  
    Dim oFSO As Object A^t"MYX@  
    Set oFSO = CreateObject("Scripting.FileSystemObject") @??u})^EL  
    Erase lineArray 8a?IC|~Pz  
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    Dim fid As Long hj+p`e S  
    If oFSO.fileexists( fileName ) Then C!hXEtK  
        fid = FreeFile() [Zh2DNp  
        Open fileName For Input As fid 16L"^EYq  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) k 5t{  
        Close fid GG*BN<(>!  
    End If Ls(&HOK[p  
    Set oFSO = Nothing pRb<wt7v
 
    Return UBound( lineArray ) F~%|3a$Y  
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End Function fG3wc l~  
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Sub GetFileList( ByVal in_dir As String, _ M.X}K7Z_/  
                 ByRef in_flist() As String ) $G)&J2z
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    'Redimension the file list array } mgVC  
    Erase in_flist Nz}|%.GP"  
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    'Tracks how many files are found ]bf'  
    Dim fCount As Long y)IGTW o  
    fCount = 0 3F;EE:  
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    'Recurse directory and search for text files B5D3_iX]  
    Dim f As String gNG.l  
    f = Dir$(in_dir & "*.txt") ,#=eu85'  
    While f <> "" $tEdBnf^ca  
        ReDim Preserve in_flist(fCount) pz.Y=V\t  
        in_flist(fCount) = f w' .'Yu6  
        fCount += 1 Hi$#!OU  
        f = Dir$() PKl]GegP  
    Wend /nwxuy  
    ReDim Preserve in_flist(fCount-1) gh.w Li$+  
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End Sub cn@03&dAl  
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