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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 0%9Nf!j  
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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 NvZ )zE  
    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。 G O=&  
    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。 PhS`,I^Z  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 %/86}DCfE?  
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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。 fCA/   
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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) f-V8/  
    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 UHtxzp =[  
    例如下所示: R"au8f.  
    Sample name:  EDF-C1-56 $9}z^sGIM  
    Merging data from file EDF-C1-56 0-0.txt >UP{= `  
    Finished merging RPC data for sample EDF-C1-56 y5XHJUTu  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt IQZBH2R  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 s[V$f vW  
    a. 创建一个新的散射库 :?Xd&u0){  
    b. 散射模型命名 {L!w/IeX  
    c. 改变散射模型为“Tabulated BSDF”. WhO;4-q)2  
    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 ) kH!I&4d&  
    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。 _L6WbRu|  
    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 H$:Z`CQt<  
    g. 点击OK 8-N8v *0  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 uc% &g  
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    脚本代码 h\ (z!7t*  
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    '#Language "WWB-COM" +TzF*Np  
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    Option Explicit [TZlvX(E  
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    Sub Main 1PMBo=SUe8  
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        'Cleanup q;T3bxp+  
        ClearOutputWindow() ~~?4w.k  
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        Print "Merging RPC Photonics BSDF Data Files" VrF(0,-Z`3  
        SetTextColor(255,0,0) gr'M6&>  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." E^.y$d~dS  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." *t;'I -1w^  
        SetTextColor(0,0,0)  +X i#y}%  
    }+[H~8)5  
        'Current directory of this script (should be the same as the text files being merged) 4:\s.Z{!3  
        Dim cDir As String <a-I-~  
        cDir = MacroDir$ & "\" `.z;.&x  
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        'Array which will be populated with the list of files to be merged ti:qOSIDTA  
        Dim fList() As String, curFile As String wVvk{tS  
        GetFileList( cDir, fList ) (C#9/WO?  
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        Print "" sXzxEhp  
        Print "Files found for merging:" SxMrX C*  
        For Each curFile In fList u>Z0ug6x  
            Print Chr(9) & curFile m*L*# ZBS  
        Next (F$V m  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. =J0X{Ovn4z  
        Dim nameArray() As String, sampName As String ^$):Xz  
        nameArray = Split(fList(0)," 0-0.txt") \UI7H1XDH  
        sampName  = nameArray(0) ^l#Z*0@><~  
        Print "" QN_Zd@K*A  
        Print "Sample name: " & Chr(9) & sampName @O}%sjC1  
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        'Open an output file and write the FRED header data _ x&Y'X|  
        Dim outFile As String nB?$W4  
        outFile = cDir & sampName & "_FRED.txt" N"2Ire  
        Open outFile For Output As #1 '>AOJ aA  
        Print #1, "type bsdf_data" B$aA=+<S  
        Print #1, "format angles=deg bsdf=value scale=1" ]KfjZ!Qh  
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        'Loop the file list, skip the two header lines and write the remaining data to file +K4d(!Sb  
        Dim lineArray() As String, curLine As Long "d'D:>z]%  
        For Each curFile In fList 1 dT1DcZ  
            Print "Merging data from file " & curFile !/G2vF"  
            ReadFile( cDir & curFile, lineArray ) xU#f>@v!  
            For curLine = 2 To UBound(lineArray) d\}r.pD  
                Print #1, lineArray(curLine) zhH-lMNj-  
            Next +E7s[9/r  
        Next '~ RP+  
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        'Close the output file `_C4L=q"  
        Close #1 dEU +\NY  
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        Print "Finished merging RPC data for sample " & sampName Zr,:i MPZ  
        Print "FRED formatted data file: " & Chr(9) & outFile Hc1S:RW  
    End Sub mG2*s ^$  
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    'Utility function to read the contents of a file into an array of strings. GU'/-6-T  
    Function ReadFile(ByVal fileName As String, _ + ^n [B  
                      ByRef lineArray() As String) As Long !6hUTjhW7z  
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        ReadFile = -1 bD[W`yW0  
        Dim oFSO As Object (K"U #Zn  
        Set oFSO = CreateObject("Scripting.FileSystemObject") p`lv$ @q'  
        Erase lineArray 5q<AMg  
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        Dim fid As Long e;9Z/);#s  
        If oFSO.fileexists( fileName ) Then UN'[sHjOnD  
            fid = FreeFile() OnE#8*8  
            Open fileName For Input As fid d 6 t#4!  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) _oK*1#Rm8  
            Close fid .6Tan2[%  
        End If P!@b:.$  
        Set oFSO = Nothing Coz\fL  
        Return UBound( lineArray ) :/ ,h)h)|  
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    End Function "w.gP8`  
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    Sub GetFileList( ByVal in_dir As String, _ 4Cs |F7R  
                     ByRef in_flist() As String ) F)_zR  
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        'Redimension the file list array Os--@5e  
        Erase in_flist T$[50~  
    ? S^ U-.`  
        'Tracks how many files are found Vx$ ?)&  
        Dim fCount As Long "J|{'k`  
        fCount = 0 ^ Q]I)U  
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        'Recurse directory and search for text files k I  
        Dim f As String wp7<0PP  
        f = Dir$(in_dir & "*.txt") JB.f7-  
        While f <> "" SPfz/ q{  
            ReDim Preserve in_flist(fCount) +?r,Nn  
            in_flist(fCount) = f yf3c- p  
            fCount += 1 tnL$v2e6q  
            f = Dir$() s`Z | A  
        Wend 6v(?Lr`D  
        ReDim Preserve in_flist(fCount-1) Gf``0F)  
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    End Sub 4e OS+&  
     
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