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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 l26DPtWi  
    pfj%AP:  
    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 P8DT2|Z6f]  
    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。 Pb0+ z=L  
    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。 jEQr{X7bEL  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 (bfHxkR.  
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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。 ebk{p <  
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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) fM jn8.  
    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 h.Cr;w,2R  
    例如下所示: @kR/=EfS  
    Sample name:  EDF-C1-56 O=os ,'"  
    Merging data from file EDF-C1-56 0-0.txt 'jp nQcwxx  
    Finished merging RPC data for sample EDF-C1-56 @:$zReS2  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 0mB]*<x8  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 27b7~!  
    a. 创建一个新的散射库 !:Lb^C;/  
    b. 散射模型命名 HR'r~ #j  
    c. 改变散射模型为“Tabulated BSDF”. 8Rq+eOP=S  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) (>m3WI$d  
    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;;F(yk8  
    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 *#j+,q!X  
    g. 点击OK ]JQk,<l5E  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 |;q*Zy(  
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    脚本代码 l 6wX18~XJ  
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    '#Language "WWB-COM" zn5  
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    Option Explicit 5q[0;`J  
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    Sub Main 9WQC\/w  
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        'Cleanup 8ID fYJ  
        ClearOutputWindow() \nV|Y=5  
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        Print "Merging RPC Photonics BSDF Data Files" >V:g'[b  
        SetTextColor(255,0,0) PezUG{q(  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." h'wOslyFa  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." Qg+0(odd  
        SetTextColor(0,0,0) {N+N4*  
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        'Current directory of this script (should be the same as the text files being merged) ADRjCk}I  
        Dim cDir As String =p>"PqJ/7n  
        cDir = MacroDir$ & "\" }9fH`C/m  
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        'Array which will be populated with the list of files to be merged nf!RB-orF  
        Dim fList() As String, curFile As String <Gzy*1 Q&  
        GetFileList( cDir, fList ) qPdNI1 |  
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        Print "" 'j=7'aX>K  
        Print "Files found for merging:"  D/hQ{T  
        For Each curFile In fList E)|_7x<u  
            Print Chr(9) & curFile pYV$sDlD  
        Next JsOPI ]  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. UM%[UyYQ  
        Dim nameArray() As String, sampName As String Ee>P*7*jB  
        nameArray = Split(fList(0)," 0-0.txt") ~1YL  
        sampName  = nameArray(0) <Ft6d  
        Print "" e47JLW&b  
        Print "Sample name: " & Chr(9) & sampName MP,l*wVd  
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        'Open an output file and write the FRED header data l|-1H76  
        Dim outFile As String k{n*[)m  
        outFile = cDir & sampName & "_FRED.txt" haW8zb0z  
        Open outFile For Output As #1 4R\bU"+jZ_  
        Print #1, "type bsdf_data" ~T<#HSR`  
        Print #1, "format angles=deg bsdf=value scale=1" S4kGy}{+i  
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        'Loop the file list, skip the two header lines and write the remaining data to file M*| y&XBe  
        Dim lineArray() As String, curLine As Long ^a|$z$spf  
        For Each curFile In fList }.|\<8_  
            Print "Merging data from file " & curFile .EVy?-   
            ReadFile( cDir & curFile, lineArray ) k%#`{#n i  
            For curLine = 2 To UBound(lineArray) 48M)A  
                Print #1, lineArray(curLine) -i|qk`Y  
            Next m` cw:  
        Next ;nG"y:qq  
    Ojp)OeF\  
        'Close the output file rKq/=Avv  
        Close #1 %*P59%  
    !c:Q+:,H  
        Print "Finished merging RPC data for sample " & sampName Rk^Fasg"  
        Print "FRED formatted data file: " & Chr(9) & outFile 8^=g$;g  
    End Sub ,.tT9? m  
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    'Utility function to read the contents of a file into an array of strings. wo7.y["$  
    Function ReadFile(ByVal fileName As String, _ AY:3o3M  
                      ByRef lineArray() As String) As Long Mw7!w-1+  
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        ReadFile = -1 gs 8w/  
        Dim oFSO As Object ]CH@ T9d5V  
        Set oFSO = CreateObject("Scripting.FileSystemObject") {rGq|Bj  
        Erase lineArray > ZkcL7t9  
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        Dim fid As Long H ~1laV  
        If oFSO.fileexists( fileName ) Then N+l~r]: &  
            fid = FreeFile() k(o[T),_%0  
            Open fileName For Input As fid @/yRE^c  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) Jl&bWp^3  
            Close fid G ;V@oT  
        End If @B ~! [l  
        Set oFSO = Nothing _~_04p  
        Return UBound( lineArray ) ;_K+b,  
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    End Function b$[_(QUw  
    I*@\pc}  
    Sub GetFileList( ByVal in_dir As String, _ Y\BB;"x1  
                     ByRef in_flist() As String ) VgZ<T,SuW  
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        'Redimension the file list array rB?u.jn0T  
        Erase in_flist F }pS'Y  
    >joGG T  
        'Tracks how many files are found j2lo~J)  
        Dim fCount As Long -'JTVfm.  
        fCount = 0 %cO;{og M  
    # j*$ `W;  
        'Recurse directory and search for text files mc|T}B  
        Dim f As String vX)6N#D!  
        f = Dir$(in_dir & "*.txt") yk#yrxM  
        While f <> "" +@]1!|@(  
            ReDim Preserve in_flist(fCount) l7aGo1TcIh  
            in_flist(fCount) = f mW1Sd#0  
            fCount += 1 M ^ ZoBsZ  
            f = Dir$() [ar:zl V8  
        Wend *)ed(+b  
        ReDim Preserve in_flist(fCount-1) K%qunjv  
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    End Sub @iUzRsl  
     
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