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    [技术]RPC Photonics扩散片BSDF [复制链接]

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    只看楼主 倒序阅读 楼主  发表于: 07-22
    摘要 \78E>(`'  
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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。
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    背景 I<#X#_YP  
    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。 CV @P +  
    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。 712nD ?>  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 =cEsv&i  
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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。 vxmX5.  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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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) KZ%i&w#<  
    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 fbh,V%t7  
    例如下所示: QCb D^  
    Sample name:  EDF-C1-56 x-[ItJ% l  
    Merging data from file EDF-C1-56 0-0.txt Y1h)aQ5{  
    Finished merging RPC data for sample EDF-C1-56  ;2C  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt `6~0W5  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ii?T:T@  
    a. 创建一个新的散射库 D6L+mTN  
    b. 散射模型命名 :i<*~0r<  
    c. 改变散射模型为“Tabulated BSDF”. +4:eb)e  
    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 ) G[>NP#P  
    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。 S~3|1Hw*tN  
    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 lEHx/#qt9  
    g. 点击OK Z<;W*6J  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 "J"=<_?  
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    脚本代码 EIRDH'[L  
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    '#Language "WWB-COM" 7W)W9=&BT  
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    Option Explicit blQ&QQL  
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    Sub Main Eiu/p&ct  
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        'Cleanup bny5e:= d  
        ClearOutputWindow() vxZ'-&;t  
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        Print "Merging RPC Photonics BSDF Data Files" p-i Fe\+  
        SetTextColor(255,0,0) 67(s\  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." un 5r9  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." hP)Zm%@0f  
        SetTextColor(0,0,0) 5REFz  
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        'Current directory of this script (should be the same as the text files being merged) DC h !Z{I  
        Dim cDir As String \#,2#BmO"E  
        cDir = MacroDir$ & "\" Dz0D ^(;V  
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        'Array which will be populated with the list of files to be merged [`@M!G.  
        Dim fList() As String, curFile As String w x]?D%l  
        GetFileList( cDir, fList ) E4% -*n  
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        Print "" gk|>E[.  
        Print "Files found for merging:" q KD  
        For Each curFile In fList 4G,FJjE`p  
            Print Chr(9) & curFile a]r+np]vTy  
        Next "kP,v&n  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. J]U_A/f  
        Dim nameArray() As String, sampName As String )c4tGT<  
        nameArray = Split(fList(0)," 0-0.txt") 7Vy_Cec1  
        sampName  = nameArray(0) DT`HS/~fH  
        Print "" _|u}^MLO  
        Print "Sample name: " & Chr(9) & sampName 3/+kjY/  
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        'Open an output file and write the FRED header data Yk|6?e{+)  
        Dim outFile As String b,^ "-r  
        outFile = cDir & sampName & "_FRED.txt" =_`q;Tu=  
        Open outFile For Output As #1 jQ V[zcM  
        Print #1, "type bsdf_data" n}UJ - \$  
        Print #1, "format angles=deg bsdf=value scale=1" , Wd=!if  
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        'Loop the file list, skip the two header lines and write the remaining data to file mS'Ad<  
        Dim lineArray() As String, curLine As Long ^UKAD'_#%O  
        For Each curFile In fList C7dq=(p&  
            Print "Merging data from file " & curFile hV(^Y)f  
            ReadFile( cDir & curFile, lineArray ) 3JGrJ!x  
            For curLine = 2 To UBound(lineArray) ',R%Q0Q  
                Print #1, lineArray(curLine) &)OI!^ (  
            Next bN/8 ~!  
        Next IB&G#2M<  
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        'Close the output file h,$CJdDY]  
        Close #1 GKFRZWXdT  
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        Print "Finished merging RPC data for sample " & sampName 7<)H?;~;  
        Print "FRED formatted data file: " & Chr(9) & outFile j;`pAN('  
    End Sub r<ww%2HTS  
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    'Utility function to read the contents of a file into an array of strings. )zxb]Pg+  
    Function ReadFile(ByVal fileName As String, _ pL,XHR@Iv  
                      ByRef lineArray() As String) As Long _\4#I(  
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        ReadFile = -1 f,yl'2{  
        Dim oFSO As Object , ~ 1+MZ=  
        Set oFSO = CreateObject("Scripting.FileSystemObject") Led\S;pl  
        Erase lineArray J>v[5FX+  
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        Dim fid As Long G{[w+ObX  
        If oFSO.fileexists( fileName ) Then O4X03fUx  
            fid = FreeFile() <KX9>e  
            Open fileName For Input As fid D=^&?@k<  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) p(pfJ^/:(  
            Close fid |^-D&C(Eu  
        End If y!1X3X,V  
        Set oFSO = Nothing &j:e<{@  
        Return UBound( lineArray ) &lLk[/b  
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    End Function _fS\p|W(E  
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    Sub GetFileList( ByVal in_dir As String, _ I-^sJ@V;  
                     ByRef in_flist() As String ) ~+1mH  
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        'Redimension the file list array T!]rdN!  
        Erase in_flist =J1V?x=l@  
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        'Tracks how many files are found KNmU2-%l  
        Dim fCount As Long _6fy'%J=U  
        fCount = 0 4tkT\.  
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        'Recurse directory and search for text files sAc1t`  
        Dim f As String UdrgUqq)  
        f = Dir$(in_dir & "*.txt") kS_#8 I  
        While f <> "" )tBz=hy#  
            ReDim Preserve in_flist(fCount) :lXY% [!6P  
            in_flist(fCount) = f ]AA|BeL?|  
            fCount += 1 zd%f5L('  
            f = Dir$() [KBa=3>{  
        Wend :!s7B|_U  
        ReDim Preserve in_flist(fCount-1) KWo Ps%G  
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    End Sub d(|?gN^  
     
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