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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 CSU>nIE0  
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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 v%aD:%wlY@  
    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。 l}AB):<Z  
    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。 o7 !@WOeZ3  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 l:@.D|(o3  
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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。 *pasI.2s#  
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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) 71/6=aq>n  
    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 6ldDt?iSg  
    例如下所示: ;U`HvIch  
    Sample name:  EDF-C1-56 |E7]69=P  
    Merging data from file EDF-C1-56 0-0.txt 5 ?vIkf  
    Finished merging RPC data for sample EDF-C1-56 [=E<iPl  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt I3s}t$`y(  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 *`jEg=)  
    a. 创建一个新的散射库 &(.ZHF  
    b. 散射模型命名 Dkdm~~Rr  
    c. 改变散射模型为“Tabulated BSDF”. 7SqsVq`[~  
    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 ) x@k9]6/zs  
    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。 A`r&"i OKA  
    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:utw T  
    g. 点击OK Ta[}k/zW  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 YT:5J%"  
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    脚本代码 zR<jZwo]#  
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    '#Language "WWB-COM" lp]O8^][&  
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    Option Explicit $4M3j%S  
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    Sub Main uuC/F_='B  
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        'Cleanup [wOO)FjT  
        ClearOutputWindow() ?QMs<  
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        Print "Merging RPC Photonics BSDF Data Files" p{U8z\  
        SetTextColor(255,0,0)  :D/R  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." w\QpQ~OX  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 4v?S` w:6  
        SetTextColor(0,0,0) eX$Biv1N  
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        'Current directory of this script (should be the same as the text files being merged) 7:;V[/  
        Dim cDir As String O ,;SA  
        cDir = MacroDir$ & "\" {M$8V~8D  
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        'Array which will be populated with the list of files to be merged /;>EyWW  
        Dim fList() As String, curFile As String GS^4t mc  
        GetFileList( cDir, fList ) d8K^`k+x  
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        Print "" >]`x~cE.5  
        Print "Files found for merging:" /za,&7sf  
        For Each curFile In fList s6 ^JgdW  
            Print Chr(9) & curFile k{#:O=  
        Next U9q*zP_jV  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. SW=p5@Hy{  
        Dim nameArray() As String, sampName As String [+1 i$d  
        nameArray = Split(fList(0)," 0-0.txt") s0h)~z  
        sampName  = nameArray(0) _\<M58/z  
        Print "" qnlj~]NV  
        Print "Sample name: " & Chr(9) & sampName =osj}(  
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        'Open an output file and write the FRED header data BKTsc/v2>:  
        Dim outFile As String ^q6~xC,/  
        outFile = cDir & sampName & "_FRED.txt" | jkmh6  
        Open outFile For Output As #1 t&oNJq{  
        Print #1, "type bsdf_data" @PI\.y_w  
        Print #1, "format angles=deg bsdf=value scale=1" bM'AD[  
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        'Loop the file list, skip the two header lines and write the remaining data to file wVVe L$28  
        Dim lineArray() As String, curLine As Long ~:@H6Ke[  
        For Each curFile In fList izxCbbg  
            Print "Merging data from file " & curFile )<|TEp4r-  
            ReadFile( cDir & curFile, lineArray ) :s5g6TR  
            For curLine = 2 To UBound(lineArray) Z*)<E)  
                Print #1, lineArray(curLine) Cr` 0C  
            Next BAhC-;B#R  
        Next x0d+cSw  
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        'Close the output file 4|(?Wt)5  
        Close #1 x\%eg w  
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        Print "Finished merging RPC data for sample " & sampName 0b4O J[  
        Print "FRED formatted data file: " & Chr(9) & outFile (g Z!o_  
    End Sub >g[W@FhT'k  
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    'Utility function to read the contents of a file into an array of strings. DHAWUS6  
    Function ReadFile(ByVal fileName As String, _ TU/J]'))C  
                      ByRef lineArray() As String) As Long 5c"kLq6r  
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        ReadFile = -1 _x!pM j(A  
        Dim oFSO As Object 5-OvPTY`M  
        Set oFSO = CreateObject("Scripting.FileSystemObject") cC4T3]4l'  
        Erase lineArray CytpL`&^]  
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        Dim fid As Long j#&  
        If oFSO.fileexists( fileName ) Then C gx?K]>y  
            fid = FreeFile()  q0~_D8e,  
            Open fileName For Input As fid ?@1'WD t  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 2]+.8G7D%  
            Close fid +RkYW*|$S  
        End If ~laZ(Bma);  
        Set oFSO = Nothing a%dx\&K  
        Return UBound( lineArray ) h,x]  
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    End Function ,<1*  
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    Sub GetFileList( ByVal in_dir As String, _ R%%`wmG)"  
                     ByRef in_flist() As String ) `y`xk<q  
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        'Redimension the file list array +HX'AC  
        Erase in_flist }kj6hnQ  
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        'Tracks how many files are found ZkW@|v  
        Dim fCount As Long { rT`*P~  
        fCount = 0 U3}R^W~eb  
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        'Recurse directory and search for text files |Z ,G  
        Dim f As String 6<Z: Xw  
        f = Dir$(in_dir & "*.txt") yjd'{B9{  
        While f <> "" 5F"?]'*/  
            ReDim Preserve in_flist(fCount) O@iW?9C+  
            in_flist(fCount) = f tWn m{mF  
            fCount += 1 W[Bu&?h$  
            f = Dir$() oui!fTy  
        Wend F-^HN%  
        ReDim Preserve in_flist(fCount-1) +,Az\aT/%  
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    End Sub s3{s.55{m  
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