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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: 2025-07-22
    摘要: {FS)f  
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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: _*b`;{3  
    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。 {<-wm-]mo  
    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。 oe0YxSauL  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 $)BPtGMGo  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 hZ!kh3@:`  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) NffKK:HvBB  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 *[*q#b$j  
    例如下所示: x%HxM~&  
    Sample name:  EDF-C1-56 Gf:dN_e6.  
    Merging data from file EDF-C1-56 0-0.txt 5`gVziS!S  
    Finished merging RPC data for sample EDF-C1-56 67Qu<9}<-  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 8#- Nx]VM  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 c 3o3i  
    a. 创建一个新的散射库 ,^Q~w b!{  
    b. 散射模型命名 V\opC6*L_e  
    c. 改变散射模型为“Tabulated BSDF”. !H{>c@i  
    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 ) 5MKM;6cA&p  
    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。 4;r,U{uR  
    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, PAtv#)h  
    g. 点击OK TW70z]B  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 cAot+N+9|]  
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    脚本代码: :N"&o(^  
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    '#Language "WWB-COM" 23`salLclG  
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    Option Explicit 4cM0f,nc+  
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    Sub Main BHYguS^qz  
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        'Cleanup F]r'j ZL  
        ClearOutputWindow() $p&eS_f  
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        Print "Merging RPC Photonics BSDF Data Files" U1pE2o-  
        SetTextColor(255,0,0) &=$f\O1Ty  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." W[ W)q%[)  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." ~{5v a  
        SetTextColor(0,0,0) @G=7A;-pv0  
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        'Current directory of this script (should be the same as the text files being merged) ~gGkw#  
        Dim cDir As String JX[]u<h?  
        cDir = MacroDir$ & "\" _KxR~k^  
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        'Array which will be populated with the list of files to be merged $Cfp1#  
        Dim fList() As String, curFile As String rKI<!  
        GetFileList( cDir, fList ) un -h%-e |  
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        Print "" #\n* Qg4p  
        Print "Files found for merging:" D1v0`od'  
        For Each curFile In fList U`HY eJ  
            Print Chr(9) & curFile L?N-uocT  
        Next x9a\~XL>a  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. <OKc?[  
        Dim nameArray() As String, sampName As String rxyeix  
        nameArray = Split(fList(0)," 0-0.txt") g<M!]0OK  
        sampName  = nameArray(0) svl!"tMXl  
        Print "" "-dA\,G  
        Print "Sample name: " & Chr(9) & sampName j|K;Yi  
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        'Open an output file and write the FRED header data >dm9 YfQ  
        Dim outFile As String `67i1w`  
        outFile = cDir & sampName & "_FRED.txt" Q~svtN  
        Open outFile For Output As #1 .Wy'  
        Print #1, "type bsdf_data" |m"Gr)Gm  
        Print #1, "format angles=deg bsdf=value scale=1" r hucBm  
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        'Loop the file list, skip the two header lines and write the remaining data to file 3Wv^{|^  
        Dim lineArray() As String, curLine As Long PQSmBTs.  
        For Each curFile In fList ~M} K]Li  
            Print "Merging data from file " & curFile DwGM+)!  
            ReadFile( cDir & curFile, lineArray ) 87+fd_G  
            For curLine = 2 To UBound(lineArray) U0:*?uA.  
                Print #1, lineArray(curLine) B>!mD{N  
            Next a EIz,^3  
        Next $`/UG0rdC  
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        'Close the output file E&y)`>Nq{  
        Close #1 :?g+\:`/0j  
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        Print "Finished merging RPC data for sample " & sampName 7_l Wr  
        Print "FRED formatted data file: " & Chr(9) & outFile 9wldd*r  
    End Sub :adz~L$  
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    'Utility function to read the contents of a file into an array of strings. U), HrI>;  
    Function ReadFile(ByVal fileName As String, _ M 80Q6K  
                      ByRef lineArray() As String) As Long Xnjl {`  
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        ReadFile = -1 \OFmd!Cz  
        Dim oFSO As Object |/n7(!7$[v  
        Set oFSO = CreateObject("Scripting.FileSystemObject") %,02i@Fc  
        Erase lineArray q6C`hVM l  
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        Dim fid As Long s=jYQ5nv  
        If oFSO.fileexists( fileName ) Then `H$XO{w  
            fid = FreeFile() #\Rxqh7  
            Open fileName For Input As fid md'wre3  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) n~|?)EL  
            Close fid 3Q=\W<Wu  
        End If ut560,h~  
        Set oFSO = Nothing S!=R\_{u$  
        Return UBound( lineArray ) {fHor  
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    End Function [(#)9/3,  
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    Sub GetFileList( ByVal in_dir As String, _ PN]hG,q*4O  
                     ByRef in_flist() As String ) hZ e{Ri  
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        'Redimension the file list array &k}B66  
        Erase in_flist Ul]7IUzsu  
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        'Tracks how many files are found V^[&4  
        Dim fCount As Long o(Z~J}l({  
        fCount = 0 mKO~`Wq%@  
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        'Recurse directory and search for text files 1aRTvaGo  
        Dim f As String -;_"Y]#  
        f = Dir$(in_dir & "*.txt") ;2`6eyr  
        While f <> "" >\? z,Nin  
            ReDim Preserve in_flist(fCount) |au`ph5  
            in_flist(fCount) = f +)q ,4+K%}  
            fCount += 1 ^t gjs$M|  
            f = Dir$() Bx|W#:3e  
        Wend ?|W3RK;  
        ReDim Preserve in_flist(fCount-1) ,s 3|  
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    End Sub 4uoZw 3O  
     
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