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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 3pI)  
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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 k{w  
    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。 x]<0Kq9K  
    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。 &(,-:"{pNR  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 >J_%'%%f  
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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。 73>Hzpv0  
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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) e? n8S  
    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 _Q6` Wp6m  
    例如下所示: "|W``&pM  
    Sample name:  EDF-C1-56 U A}N  
    Merging data from file EDF-C1-56 0-0.txt pm k;5 d  
    Finished merging RPC data for sample EDF-C1-56 C{P:1ELYXH  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Jw)-6WJ!uO  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 =y WHm  
    a. 创建一个新的散射库 |aMeh;X t  
    b. 散射模型命名 z2cd1HxN  
    c. 改变散射模型为“Tabulated BSDF”. 7Hzv-s  
    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}>cAj*  
    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。 |FH|l#bu>  
    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  NncII5z  
    g. 点击OK o `}(1$a>  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 $J)2E g  
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    脚本代码  Jyo(Etp  
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    '#Language "WWB-COM" TwLQ;Q  
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    Option Explicit g.d~`R@v  
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    Sub Main RLr^6+v)U  
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        'Cleanup U((mOm6  
        ClearOutputWindow() mr\C  
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        Print "Merging RPC Photonics BSDF Data Files" 5;Q9Z1 `  
        SetTextColor(255,0,0) o`<ps$ yT  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." }N%uQP#I  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." Rg6/6/ IN  
        SetTextColor(0,0,0) ~e#QAaXD#5  
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        'Current directory of this script (should be the same as the text files being merged) (YKkJ  
        Dim cDir As String r0/o{Y|l6  
        cDir = MacroDir$ & "\" Yi+$g  
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        'Array which will be populated with the list of files to be merged G+zIh}9  
        Dim fList() As String, curFile As String uhO-0H  
        GetFileList( cDir, fList ) #AUV&pI[  
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        Print "" \:|"qk  
        Print "Files found for merging:" g]Fm%iy  
        For Each curFile In fList rw]7Lr_>  
            Print Chr(9) & curFile "Iwd-#;$;  
        Next wC~LZSTt  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Xw |6 #^  
        Dim nameArray() As String, sampName As String u RPvo}!=1  
        nameArray = Split(fList(0)," 0-0.txt") Ab/KVB  
        sampName  = nameArray(0) mqk tM6  
        Print "" 6;{E-y  
        Print "Sample name: " & Chr(9) & sampName 3~6,fTMz{  
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        'Open an output file and write the FRED header data *Ph@XkhU  
        Dim outFile As String z((9vi W  
        outFile = cDir & sampName & "_FRED.txt" b5.L== >  
        Open outFile For Output As #1 hR(p{$-T  
        Print #1, "type bsdf_data" sTChbks  
        Print #1, "format angles=deg bsdf=value scale=1" -5TMV#i {  
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        'Loop the file list, skip the two header lines and write the remaining data to file (Q~ (t  
        Dim lineArray() As String, curLine As Long /Vy,6:$H3  
        For Each curFile In fList c!HmZ]/  
            Print "Merging data from file " & curFile i $W E1-  
            ReadFile( cDir & curFile, lineArray ) y~/i{a;1y  
            For curLine = 2 To UBound(lineArray) "?SR+;Y:q  
                Print #1, lineArray(curLine) jhkNi`E7  
            Next PuoN<9 #  
        Next 6Z7J<0  
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        'Close the output file TB(!*t  
        Close #1 m0_B[dw  
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        Print "Finished merging RPC data for sample " & sampName fw+ VR.#2H  
        Print "FRED formatted data file: " & Chr(9) & outFile 71inHg  
    End Sub EGIwqci:  
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    'Utility function to read the contents of a file into an array of strings. A.@Af+  
    Function ReadFile(ByVal fileName As String, _ n9x&Ws;  
                      ByRef lineArray() As String) As Long z}f;_NX  
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        ReadFile = -1 EaXD Y<  
        Dim oFSO As Object ga+Z6|t  
        Set oFSO = CreateObject("Scripting.FileSystemObject") T^XU5qgN  
        Erase lineArray kFo&!  
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        Dim fid As Long PP_fTacX  
        If oFSO.fileexists( fileName ) Then -|x YT+?%  
            fid = FreeFile() F\( 7B#  
            Open fileName For Input As fid ;_<K>r*  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) ZFO*D79:K  
            Close fid }$T!qMst{  
        End If z(dX<  
        Set oFSO = Nothing /aHx'TG  
        Return UBound( lineArray ) P|{Et=R`1  
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    End Function <=7N2t)s4  
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    Sub GetFileList( ByVal in_dir As String, _ PquATAzQA  
                     ByRef in_flist() As String ) <"rckPv_H  
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        'Redimension the file list array WA&&*ae5`  
        Erase in_flist Y\1XKAfB  
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        'Tracks how many files are found %V&I${z  
        Dim fCount As Long ;V"(! 'd  
        fCount = 0 KIfR4,=Q|  
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        'Recurse directory and search for text files *Ul L\  
        Dim f As String #w:6<$  
        f = Dir$(in_dir & "*.txt") ]p sx\ZMa  
        While f <> "" #v QyECf  
            ReDim Preserve in_flist(fCount) #m<<]L(o8W  
            in_flist(fCount) = f +HxL>\  
            fCount += 1 ZFsJeF'"  
            f = Dir$() "-;l{tL  
        Wend %B{NH~  
        ReDim Preserve in_flist(fCount-1) !NfN16  
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    End Sub ;\gsd'i  
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