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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 l)V646-O,~  
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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 :N'   
    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。 <eZrb6a'  
    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。 e1hf{:&/G@  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 .`oKd@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。 Sp]ov:]%f  
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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) #hXuGBZEI  
    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 M{p9b E[j  
    例如下所示: ;HiaX<O!  
    Sample name:  EDF-C1-56 r>G||/Z  
    Merging data from file EDF-C1-56 0-0.txt BL%3[JQ  
    Finished merging RPC data for sample EDF-C1-56 zR?1iV.]  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt  _w FK+>  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 >E WK cocM  
    a. 创建一个新的散射库 tZ:fOM  
    b. 散射模型命名 o%K1!'  
    c. 改变散射模型为“Tabulated BSDF”. -o57"r^x  
    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 ) (A-Uo   
    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。  1 K]  
    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 ;|f]e/El  
    g. 点击OK oUB9)C~  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 T7N\b]?j@Y  
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    脚本代码 !ED,'d%J  
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    '#Language "WWB-COM" (V"7H  
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    Option Explicit f|2QI ~R  
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    Sub Main B9'2$s+Z;  
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        'Cleanup <iM}p^jX9  
        ClearOutputWindow() Gz7,g Y  
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        Print "Merging RPC Photonics BSDF Data Files" 2-^ ['R  
        SetTextColor(255,0,0) x_= 3 !)  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." ='(;!3ZH  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." Hq,znRz~`  
        SetTextColor(0,0,0) uC2 5pH"  
    '(8} <(%  
        'Current directory of this script (should be the same as the text files being merged) #:Ukv?  
        Dim cDir As String AS lmW@/9v  
        cDir = MacroDir$ & "\" q\Z9.T+Qo  
    Vb?_RE_H  
        'Array which will be populated with the list of files to be merged OO;I^`Yn  
        Dim fList() As String, curFile As String >jc17BJq  
        GetFileList( cDir, fList ) O\w-hk  
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        Print "" s2K8|q=  
        Print "Files found for merging:" ,;yaYF 6|/  
        For Each curFile In fList %gTY7LIe1z  
            Print Chr(9) & curFile RMAbu*D0  
        Next y <P1VES  
    Ua+Us"M3}  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. v&`n}lS  
        Dim nameArray() As String, sampName As String ,MD >Jx|  
        nameArray = Split(fList(0)," 0-0.txt") T=fVD8  
        sampName  = nameArray(0) CDDEWVd  
        Print "" ]jV1/vJ-!  
        Print "Sample name: " & Chr(9) & sampName RR>G}u9 np  
    P}-S[[b73s  
        'Open an output file and write the FRED header data !1P<A1K  
        Dim outFile As String Qq\hD@Z|  
        outFile = cDir & sampName & "_FRED.txt" Rz33_ qA  
        Open outFile For Output As #1 ~bfjP2 g  
        Print #1, "type bsdf_data" kqLpt  
        Print #1, "format angles=deg bsdf=value scale=1" 9A}nZ1Y  
    5 ~"m$/yE  
        'Loop the file list, skip the two header lines and write the remaining data to file dVBr-+  
        Dim lineArray() As String, curLine As Long G)%r|meKGB  
        For Each curFile In fList $oZV 54  
            Print "Merging data from file " & curFile i.+#a2   
            ReadFile( cDir & curFile, lineArray ) T7*p! 0  
            For curLine = 2 To UBound(lineArray) u6*mHkM  
                Print #1, lineArray(curLine) g+=f=5I3  
            Next 7] 17?s]t,  
        Next KPa&P:R3  
    T2 V(P>E  
        'Close the output file 1(4IcIR5T;  
        Close #1 ^2mCF  
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        Print "Finished merging RPC data for sample " & sampName gR k+KGKn<  
        Print "FRED formatted data file: " & Chr(9) & outFile 1VG7[#Zy  
    End Sub o [nr)  
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    'Utility function to read the contents of a file into an array of strings. `R:HMO[ow  
    Function ReadFile(ByVal fileName As String, _ 1@Rl^ey  
                      ByRef lineArray() As String) As Long !^w}Sp  
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        ReadFile = -1 AHTQF#U^  
        Dim oFSO As Object /^Zgv-n  
        Set oFSO = CreateObject("Scripting.FileSystemObject") \05 n$.  
        Erase lineArray 9K#U<Q0b'  
    Tc;j)_C)  
        Dim fid As Long QBTjiaYGa'  
        If oFSO.fileexists( fileName ) Then o&rNM5:  
            fid = FreeFile() ~)!vhdBe  
            Open fileName For Input As fid CS Isi]H  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) h?&S*)1  
            Close fid 5i&+.?(Z=  
        End If }U$p[Gi<  
        Set oFSO = Nothing 8MCSU'uQ  
        Return UBound( lineArray ) 3HB(rTw  
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    End Function x5!lnN,#  
    M!] g36h[  
    Sub GetFileList( ByVal in_dir As String, _ ziD+% -  
                     ByRef in_flist() As String ) Rm=[Sj84  
    1&JB@F9!  
        'Redimension the file list array qISzn04  
        Erase in_flist `xu/|})KI  
    Ec|5'Kz]  
        'Tracks how many files are found __,}/|K2  
        Dim fCount As Long +FtL_7[v  
        fCount = 0 qvN 5[rb  
    !8OUH6{2  
        'Recurse directory and search for text files JJE0q5[  
        Dim f As String 4(}V$#^+  
        f = Dir$(in_dir & "*.txt") HiDL:14  
        While f <> "" T~-PT39E  
            ReDim Preserve in_flist(fCount) (ysDs[? \  
            in_flist(fCount) = f M9dUo7  
            fCount += 1 8nHFNOv6  
            f = Dir$() DX@*lM  
        Wend #wZBWTj.  
        ReDim Preserve in_flist(fCount-1) -$5nqaK?  
    )x&OdFX  
    End Sub i sV9nWo$  
     
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