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    [分享]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: 2020-12-15
    摘要 <a3XV  
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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 :UciFIa  
    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。 <3CrCEPC  
    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。 je% 12DM  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 6*Qpq7Ml  
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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。 =c 4U%d2  
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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) HPB1d!^  
    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 G8'3.;"W5  
    例如下所示: v$Z1Lh  
    Sample name:  EDF-C1-56 h^,a 1'  
    Merging data from file EDF-C1-56 0-0.txt #YdU,y=B  
    Finished merging RPC data for sample EDF-C1-56 | w -W=v  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt MG>;|*$%  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 (%, '  
    a. 创建一个新的散射库 Yd'ke,Je  
    b. 散射模型命名 y0]O 6.{  
    c. 改变散射模型为“Tabulated BSDF”. _A*0K,F-  
    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 ) 2ra4t]f6  
    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。 Nx'j+>bz>y  
    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 iL<O|'be  
    g. 点击OK L4%LE/t|e  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ^lj>v}4fkW  
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    脚本代码 uyIA]OtyN  
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    '#Language "WWB-COM" <D}k@M Z  
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    Option Explicit M-hnBt  
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    Sub Main >{Djx  
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        'Cleanup L\I/2aiE  
        ClearOutputWindow() !WXSrICX[  
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        Print "Merging RPC Photonics BSDF Data Files" X +R_TC  
        SetTextColor(255,0,0) }dCnFZ{K3  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." X*@S j;|m  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." |>)mYLN!y  
        SetTextColor(0,0,0) -L@=j  
    }<p%PyM  
        'Current directory of this script (should be the same as the text files being merged) &CgD smJo#  
        Dim cDir As String :M16ijkx  
        cDir = MacroDir$ & "\" b.(^CYYQ  
    I6+5mv\  
        'Array which will be populated with the list of files to be merged fqxMTTg@  
        Dim fList() As String, curFile As String kmwFw>#  
        GetFileList( cDir, fList ) nM#\4Q[}Jh  
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        Print "" hdzaU&w  
        Print "Files found for merging:" G8VWx&RE  
        For Each curFile In fList 8}2 `^<U  
            Print Chr(9) & curFile o'G")o  
        Next Ex<0@Oz  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. TD'1L:mv  
        Dim nameArray() As String, sampName As String Em;zi.Y+V  
        nameArray = Split(fList(0)," 0-0.txt") P$Nwf,d2u  
        sampName  = nameArray(0) V0>,Kxk  
        Print "" 4?`7XJ0a  
        Print "Sample name: " & Chr(9) & sampName q-'zZ#  
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        'Open an output file and write the FRED header data raCxHY  
        Dim outFile As String @L0.Z1 ).  
        outFile = cDir & sampName & "_FRED.txt" %VgR *  
        Open outFile For Output As #1 74_ji!  
        Print #1, "type bsdf_data" B4%W,F:@  
        Print #1, "format angles=deg bsdf=value scale=1" ~_Aclm?  
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        'Loop the file list, skip the two header lines and write the remaining data to file ]*).3<Lw  
        Dim lineArray() As String, curLine As Long !U@[lBW  
        For Each curFile In fList sNWj+T  
            Print "Merging data from file " & curFile 0=NB[eG  
            ReadFile( cDir & curFile, lineArray ) IIzdCa{l  
            For curLine = 2 To UBound(lineArray) z?7pn}-  
                Print #1, lineArray(curLine) b$hQB090  
            Next @>?&Mw\c  
        Next /)N[tv2  
    >5\rU[H>  
        'Close the output file Re`= B  
        Close #1 ne%ckW?ks  
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        Print "Finished merging RPC data for sample " & sampName d:3G4g  
        Print "FRED formatted data file: " & Chr(9) & outFile 7C=t19&R'  
    End Sub Tw$lakw  
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    'Utility function to read the contents of a file into an array of strings. DF<_Ns!  
    Function ReadFile(ByVal fileName As String, _ b1-JnEc  
                      ByRef lineArray() As String) As Long I_Q'+d  
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        ReadFile = -1 ,{$:Q}`  
        Dim oFSO As Object US-P>yF  
        Set oFSO = CreateObject("Scripting.FileSystemObject") p\Jz<dkN1  
        Erase lineArray mDtD7FzJ  
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        Dim fid As Long AkGCIn3  
        If oFSO.fileexists( fileName ) Then {JMFCc[  
            fid = FreeFile() vtmvvv  
            Open fileName For Input As fid ACs?m\$Q  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) .hU ndg  
            Close fid u>}k+8~  
        End If m8.sHw  
        Set oFSO = Nothing ^J?I-LG  
        Return UBound( lineArray ) M%Ov6u<I8  
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    End Function qm2  
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    Sub GetFileList( ByVal in_dir As String, _ 0GEK xV\F  
                     ByRef in_flist() As String ) A#*0mJ8IK  
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        'Redimension the file list array in$Pk$ c  
        Erase in_flist 72.Z E%Ue  
    42mdak}\  
        'Tracks how many files are found `8EHhN;  
        Dim fCount As Long Ga"t4[=I  
        fCount = 0 jT%k{"+>+?  
    L]cZPfI6  
        'Recurse directory and search for text files :beBiO  
        Dim f As String zxY  
        f = Dir$(in_dir & "*.txt") jU/0a=h9  
        While f <> "" O.Z<dy+  
            ReDim Preserve in_flist(fCount) 0@vSl%I+  
            in_flist(fCount) = f y]yp8Bs+  
            fCount += 1 WOiw 0  
            f = Dir$() 5\lOZYHX  
        Wend zrri&QDF<  
        ReDim Preserve in_flist(fCount-1) ^<Q+=\h  
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    End Sub I8rtta  
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