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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 0_faJjTbP;  
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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 W #kOcw  
    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。 yJAz#~PO/  
    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。 u =%1%p,  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 YRm6~c  
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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。 Ryrvu1 k  
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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) 48Z0aA~+  
    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 -'mTSJ.}  
    例如下所示: UiLiy?EJ  
    Sample name:  EDF-C1-56 (TJ )Y7E  
    Merging data from file EDF-C1-56 0-0.txt OkaN VTB  
    Finished merging RPC data for sample EDF-C1-56 rsgTd\b  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt /I/gbmc)  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ~dc~<hK  
    a. 创建一个新的散射库 J-wF2*0r<  
    b. 散射模型命名 8\ { 1y:|  
    c. 改变散射模型为“Tabulated BSDF”. <UC_QPA\  
    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 ) &3_.k  
    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。 7 I`8r2H  
    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 yz7X7mAo  
    g. 点击OK QpZ CU]  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 7)#8p @Q  
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    脚本代码 `8sC>)lrwu  
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    '#Language "WWB-COM" $"[5]{'J  
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    Option Explicit lrL:v~g  
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    Sub Main "|KhqV=?v  
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        'Cleanup \]=''C=J  
        ClearOutputWindow() MGU%"7i'}  
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        Print "Merging RPC Photonics BSDF Data Files" g<(\#F}/  
        SetTextColor(255,0,0) j}fu|-  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." e"O c  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." <*F!A' w2o  
        SetTextColor(0,0,0) 3yw`%$d5  
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        'Current directory of this script (should be the same as the text files being merged) @&xWd{8'  
        Dim cDir As String #<*=)[  
        cDir = MacroDir$ & "\" (@&+?A"6`  
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        'Array which will be populated with the list of files to be merged `+0K~k|DC  
        Dim fList() As String, curFile As String z<u*I@;  
        GetFileList( cDir, fList ) s5cY>  
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        Print "" :.bBV]6q  
        Print "Files found for merging:" w1J%%//(h  
        For Each curFile In fList &6q67  
            Print Chr(9) & curFile 0wnC"2GUX  
        Next P4{!/&/  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. d;FOmo4  
        Dim nameArray() As String, sampName As String 3 =-XA2zJ  
        nameArray = Split(fList(0)," 0-0.txt") H05xt$J  
        sampName  = nameArray(0) VteMsL/H  
        Print "" Lh rU fy  
        Print "Sample name: " & Chr(9) & sampName mP[ZlS~"  
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        'Open an output file and write the FRED header data # ; 3v4P  
        Dim outFile As String *aaK_=w  
        outFile = cDir & sampName & "_FRED.txt" `m+o^!SGe  
        Open outFile For Output As #1 'LW~_\  
        Print #1, "type bsdf_data" l:- <CbG  
        Print #1, "format angles=deg bsdf=value scale=1" m4~>n(  
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        'Loop the file list, skip the two header lines and write the remaining data to file +b_o2''  
        Dim lineArray() As String, curLine As Long _Qd C V`  
        For Each curFile In fList YE;Tpji  
            Print "Merging data from file " & curFile WinwPn+9  
            ReadFile( cDir & curFile, lineArray ) L)yc_ d5  
            For curLine = 2 To UBound(lineArray) 7Q>bJ Ek7  
                Print #1, lineArray(curLine) 26B+qXEt  
            Next !&#5 *  
        Next ]gjB%R[.m  
    8'|_O  
        'Close the output file '9XSz?  
        Close #1 ly( LMr  
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        Print "Finished merging RPC data for sample " & sampName 2`P=ekF]  
        Print "FRED formatted data file: " & Chr(9) & outFile i)=dp!Bx^  
    End Sub BBDt^$  
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    'Utility function to read the contents of a file into an array of strings. B:rzM:BQ  
    Function ReadFile(ByVal fileName As String, _ J>N^FR9  
                      ByRef lineArray() As String) As Long MN<uIqG  
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        ReadFile = -1 K.r "KxCm|  
        Dim oFSO As Object v\3$$T)  
        Set oFSO = CreateObject("Scripting.FileSystemObject") :F`"CR^,  
        Erase lineArray \#7@"~<  
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        Dim fid As Long [oD u3Qn  
        If oFSO.fileexists( fileName ) Then OKV/=]GS  
            fid = FreeFile() MHPh!  
            Open fileName For Input As fid 8Os: SC@Q  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) Gy6PS{yY6t  
            Close fid t .-%@,s  
        End If N:~CN1  
        Set oFSO = Nothing h[i@c`3 /2  
        Return UBound( lineArray ) OOZxs?pR  
    ;i-<dAV8B  
    End Function Gc,6;!+(  
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    Sub GetFileList( ByVal in_dir As String, _ 'Rq2x-72}  
                     ByRef in_flist() As String ) N}CeQ'l[R  
    $A^OP{  
        'Redimension the file list array i{biQ|,.sL  
        Erase in_flist @&9, 0 x  
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        'Tracks how many files are found s`I]>e  
        Dim fCount As Long RN"Ur'+  
        fCount = 0 {66P-4Ev(  
    e N^6gub  
        'Recurse directory and search for text files  Uu0  
        Dim f As String Rj!9pwvT  
        f = Dir$(in_dir & "*.txt") Lq]t6o ]  
        While f <> "" )R6-]TkA_  
            ReDim Preserve in_flist(fCount) CfEACH4_  
            in_flist(fCount) = f XCj8QM.o  
            fCount += 1 iyTKy+3A  
            f = Dir$() FO{?Z%& ;  
        Wend o]TKL'gW  
        ReDim Preserve in_flist(fCount-1) CXh >'K  
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    End Sub f,'^"Me$c  
     
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