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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 UB4M=R|  
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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 Ke_ & dgsq  
    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。 N~w4|q!]  
    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。 /!u#S9_B  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 CUS^j  
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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。 frYPC Irj  
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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) HfF4BQxm  
    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 (4U59<ie  
    例如下所示: Hko(@z  
    Sample name:  EDF-C1-56 >/kwy2  
    Merging data from file EDF-C1-56 0-0.txt w'Kc#2  
    Finished merging RPC data for sample EDF-C1-56 Od>^yhn  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 4s Vr]p`  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 e' `xU  
    a. 创建一个新的散射库 K-xmLEu  
    b. 散射模型命名 aWLeyXsAu  
    c. 改变散射模型为“Tabulated BSDF”. f> u{e~Q,  
    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 ) Tz=YSQy$9  
    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。 /R_*u4}iD  
    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 $rZ:$d.C  
    g. 点击OK @;-6qZ  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 )A`Zgg'L7D  
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    脚本代码 `q ;79t  
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    '#Language "WWB-COM" H3#xBn>9  
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    Option Explicit ]g>@r.Nc  
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    Sub Main AX|-Gv  
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        'Cleanup LNp%]*h  
        ClearOutputWindow() E0nR Vg  
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        Print "Merging RPC Photonics BSDF Data Files" /mB'Fn6)  
        SetTextColor(255,0,0) A2` QlhZ  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 0d-w<lg9  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." b&$ ?.z  
        SetTextColor(0,0,0) dBV^Khf J  
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        'Current directory of this script (should be the same as the text files being merged) `.# l_-U{  
        Dim cDir As String $z7[RLu0!  
        cDir = MacroDir$ & "\" +s6 wF{  
    ." m6zq  
        'Array which will be populated with the list of files to be merged !;SpQ28  
        Dim fList() As String, curFile As String eJMD8#  
        GetFileList( cDir, fList ) ub "(,k P  
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        Print "" ZCQ7xQD  
        Print "Files found for merging:" 7'[C+/:  
        For Each curFile In fList D_6GzgZ  
            Print Chr(9) & curFile v-85` h  
        Next +uF!.!}  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. (K$K;f$"r  
        Dim nameArray() As String, sampName As String @jW_ r j:<  
        nameArray = Split(fList(0)," 0-0.txt") 2Yx6.e<  
        sampName  = nameArray(0) d[.kGytUt  
        Print "" eSynw$F2N  
        Print "Sample name: " & Chr(9) & sampName (/&IBd-  
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        'Open an output file and write the FRED header data oZ O 6J-ea  
        Dim outFile As String 8Ek<J+& |I  
        outFile = cDir & sampName & "_FRED.txt" 9=&e5Oq}  
        Open outFile For Output As #1 w5l:^^zF(  
        Print #1, "type bsdf_data" 2,nKbE9*  
        Print #1, "format angles=deg bsdf=value scale=1" ]McLace&  
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        'Loop the file list, skip the two header lines and write the remaining data to file &XosDt  
        Dim lineArray() As String, curLine As Long =2#a@D6Bl  
        For Each curFile In fList s-eC')w~E  
            Print "Merging data from file " & curFile LxkToO{  
            ReadFile( cDir & curFile, lineArray ) d\`A ^  
            For curLine = 2 To UBound(lineArray) PsDks3cG  
                Print #1, lineArray(curLine) <^,w,A  
            Next ?lv{;4BC  
        Next Q p7|p  
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        'Close the output file lKs*KwG  
        Close #1 omM*h{z$$  
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        Print "Finished merging RPC data for sample " & sampName l=5(5\  
        Print "FRED formatted data file: " & Chr(9) & outFile :X[(ymWNE  
    End Sub ze Qgg|;  
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    'Utility function to read the contents of a file into an array of strings. ]GYO`,  
    Function ReadFile(ByVal fileName As String, _ &I.UEF2,  
                      ByRef lineArray() As String) As Long Nt#zr]Fz  
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        ReadFile = -1 t=iSMe  
        Dim oFSO As Object ]Ff"o7gT  
        Set oFSO = CreateObject("Scripting.FileSystemObject") "GP!]3t  
        Erase lineArray krZ J"`  
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        Dim fid As Long lhTjG,U=  
        If oFSO.fileexists( fileName ) Then Cz x U @  
            fid = FreeFile() w[z^B&  
            Open fileName For Input As fid hG cq>Cvf  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) a +Q9kh  
            Close fid y3$i?}?A  
        End If SF61rm  
        Set oFSO = Nothing k,M%/AXd  
        Return UBound( lineArray ) Pze$QBNoRd  
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    End Function @D8c-`LC"*  
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    Sub GetFileList( ByVal in_dir As String, _ EA%(+tJ^0  
                     ByRef in_flist() As String ) eX 9{wb(  
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        'Redimension the file list array 5n1;@Vr  
        Erase in_flist R8UtX9'*sa  
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        'Tracks how many files are found Ev IL[\Dy  
        Dim fCount As Long .ps'{rl8  
        fCount = 0 l2>G +t(,  
    ?yzhk7j7  
        'Recurse directory and search for text files ?b2  
        Dim f As String -;'8#"{`^  
        f = Dir$(in_dir & "*.txt") _*6nTSL  
        While f <> "" h@FDP#H  
            ReDim Preserve in_flist(fCount) }pj>BK>  
            in_flist(fCount) = f Z}.N4 /  
            fCount += 1 ./mh 9ax  
            f = Dir$() K8doYN  
        Wend bCg {z b#  
        ReDim Preserve in_flist(fCount-1) Gvv~P3Dm  
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    End Sub VYkOJAEBg  
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