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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: 2023-05-11
    摘要 tQTVP2:Y  
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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 m+Um^:\jX  
    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。 3rRN~$  
    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。 d :(&q  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 c5vi Y|C^  
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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。 zQPQP`  
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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) qFV }Y0w  
    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 R WfC2$z  
    例如下所示: ,)u7PMs  
    Sample name:  EDF-C1-56 u)NmjW  
    Merging data from file EDF-C1-56 0-0.txt VZ o,AP~  
    Finished merging RPC data for sample EDF-C1-56 uaiCyh1:  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt j B.ZF7q  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 D(z}c,  
    a. 创建一个新的散射库 ,p3moD 3  
    b. 散射模型命名 e7# B?  
    c. 改变散射模型为“Tabulated BSDF”. Ei$@)qS/  
    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 ) S(&]?!  
    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。 @U)k~z2Hk  
    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 C VyYV &U,  
    g. 点击OK :<"b"{X"  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 x{|`q9V~ N  
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    脚本代码 S*0P[R  
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    '#Language "WWB-COM" &IZthJqV  
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    Option Explicit $VgazUH% =  
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    Sub Main QP%*`t?  
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        'Cleanup M@wQ6ow  
        ClearOutputWindow() cW|M4`  
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        Print "Merging RPC Photonics BSDF Data Files" <D1>;C  
        SetTextColor(255,0,0) _7^4sR8=  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 0/g 0=dW=  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 5VLJ:I?0O  
        SetTextColor(0,0,0) GELx S!  
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        'Current directory of this script (should be the same as the text files being merged) "c'K8,+?  
        Dim cDir As String !(&N{NH9  
        cDir = MacroDir$ & "\" Q^Lk^PP7  
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        'Array which will be populated with the list of files to be merged |IgH0 zZ  
        Dim fList() As String, curFile As String E+tV7xa~  
        GetFileList( cDir, fList ) 8'n xc#&  
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        Print "" N8-!}\,  
        Print "Files found for merging:" jcY:a0[{D  
        For Each curFile In fList bVbh| AA  
            Print Chr(9) & curFile /1!Wet}f  
        Next mv0JD(  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. /HiRbwQK#  
        Dim nameArray() As String, sampName As String GK>.R<[  
        nameArray = Split(fList(0)," 0-0.txt") J8>8@m6  
        sampName  = nameArray(0) 4?vTuZ/ M  
        Print "" ]-7$wVQ<  
        Print "Sample name: " & Chr(9) & sampName 7YLG<G!v)]  
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        'Open an output file and write the FRED header data FVw4BUOmi  
        Dim outFile As String c-ud $0)c  
        outFile = cDir & sampName & "_FRED.txt" <,Z6=M`  
        Open outFile For Output As #1 ;t_'87h$y  
        Print #1, "type bsdf_data" 1(;_1@P  
        Print #1, "format angles=deg bsdf=value scale=1" WF!u2E+  
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        'Loop the file list, skip the two header lines and write the remaining data to file ~$@~X*K~  
        Dim lineArray() As String, curLine As Long .8I\=+Zi  
        For Each curFile In fList Js706  
            Print "Merging data from file " & curFile c8"9Lv  
            ReadFile( cDir & curFile, lineArray ) >w}5\ 4j  
            For curLine = 2 To UBound(lineArray) 3<L>BakD  
                Print #1, lineArray(curLine) Y#A0ud,  
            Next ;hcOD4or  
        Next : K#z~#n  
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        'Close the output file  oRbG6Vv/  
        Close #1 ;@&mR <5j  
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        Print "Finished merging RPC data for sample " & sampName ];n3H~2  
        Print "FRED formatted data file: " & Chr(9) & outFile 7"iUyZ(  
    End Sub )uJu.foE  
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    'Utility function to read the contents of a file into an array of strings. &.ENcEic  
    Function ReadFile(ByVal fileName As String, _ "G+g(?N]j  
                      ByRef lineArray() As String) As Long K< ;I*cAX  
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        ReadFile = -1 3a_=e B  
        Dim oFSO As Object $XOs(>~"r  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ?df*Y5I2  
        Erase lineArray v_7?Zik8E  
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        Dim fid As Long 5R?[My  
        If oFSO.fileexists( fileName ) Then ?)# qBE ]  
            fid = FreeFile() !pwY@} oL  
            Open fileName For Input As fid #KOr-Yg|U  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) C(Bh<c0@  
            Close fid WLB@]JvTBY  
        End If }K8W%h<3S  
        Set oFSO = Nothing i 1{Lx)  
        Return UBound( lineArray ) {4%B^+}T  
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    End Function LrL ZlJf  
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    Sub GetFileList( ByVal in_dir As String, _ wTu_Am  
                     ByRef in_flist() As String ) ;nDCyn4i]  
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        'Redimension the file list array bGO[P<<  
        Erase in_flist m4=[e!  
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        'Tracks how many files are found FM80F_G^z  
        Dim fCount As Long 2EU((Q`>=(  
        fCount = 0 Ep.Q&(D >  
    42Qfv%*c  
        'Recurse directory and search for text files Pa8E.<>  
        Dim f As String rQuozbBb  
        f = Dir$(in_dir & "*.txt") `~0^fSww  
        While f <> "" HVq02 Z  
            ReDim Preserve in_flist(fCount) D<DSK~  
            in_flist(fCount) = f Zs$Qo->F  
            fCount += 1 C'_^DPzj  
            f = Dir$() qt.G_fOz  
        Wend .:`+4n  
        ReDim Preserve in_flist(fCount-1) #DqVh!t"  
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    End Sub C`++r>  
     
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