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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 5{f/H] P  
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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 m64\@ [  
    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。 `X03Q[:q"[  
    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。 7uH{UpslJ  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 c`=h K*  
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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。  xyCcd=  
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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) Ev ,8?  
    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 F<<H [,%0  
    例如下所示: [<Puh  
    Sample name:  EDF-C1-56 ZlXs7 &_  
    Merging data from file EDF-C1-56 0-0.txt 62E(=l  
    Finished merging RPC data for sample EDF-C1-56 oQB1fs  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt SvrV5X  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 0n^j 50Yq  
    a. 创建一个新的散射库 O3GaxM \x  
    b. 散射模型命名 KywT Oq  
    c. 改变散射模型为“Tabulated BSDF”. !t{!.  
    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 ) \K=PIcH  
    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。 U^S:2  
    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 c=E.-  
    g. 点击OK 2xm?,p`  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 I#e*,#'S  
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    脚本代码 ?E+XD'~  
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    '#Language "WWB-COM" }Ec"&  
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    Option Explicit DzOJ{dF  
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    Sub Main q@> m~R  
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        'Cleanup >qZRIDE5$  
        ClearOutputWindow() j KK48S  
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        Print "Merging RPC Photonics BSDF Data Files" y5 +&P  
        SetTextColor(255,0,0) 2AE|N_v8W  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." k{8N@&D  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." N|d@B{a(  
        SetTextColor(0,0,0)  3".W  
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        'Current directory of this script (should be the same as the text files being merged) }e w?{  
        Dim cDir As String <VPtbM@(m  
        cDir = MacroDir$ & "\" M](U"K?  
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        'Array which will be populated with the list of files to be merged c" HCc]  
        Dim fList() As String, curFile As String *()#*0  
        GetFileList( cDir, fList ) #SOe &W5  
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        Print "" :eO0{JN4T  
        Print "Files found for merging:" v]sGdZ(6-  
        For Each curFile In fList A O]e^Q  
            Print Chr(9) & curFile 5lbh "m=  
        Next zE{zX@  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. <9vkiEo  
        Dim nameArray() As String, sampName As String eSf:[^  
        nameArray = Split(fList(0)," 0-0.txt") "b;?2_w:E  
        sampName  = nameArray(0) Ja2.1v|r .  
        Print "" B dUyI_Ks:  
        Print "Sample name: " & Chr(9) & sampName q3t@)+l>*  
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        'Open an output file and write the FRED header data `^x^= og'  
        Dim outFile As String Pd?YS!+S  
        outFile = cDir & sampName & "_FRED.txt" 4|UIyDt8  
        Open outFile For Output As #1 )LUl?  
        Print #1, "type bsdf_data" &aU+6'+QXB  
        Print #1, "format angles=deg bsdf=value scale=1" v%w]Q B  
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        'Loop the file list, skip the two header lines and write the remaining data to file \/%mabLK  
        Dim lineArray() As String, curLine As Long IuL ]V TY  
        For Each curFile In fList 7[PXZT  
            Print "Merging data from file " & curFile 2 r)c?  
            ReadFile( cDir & curFile, lineArray ) &/" qOZAs  
            For curLine = 2 To UBound(lineArray) ~f:fOrLE#  
                Print #1, lineArray(curLine) uq_SF.a'v  
            Next `Hqu 2 '`  
        Next c@P,  
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        'Close the output file ZBWe,Xvq  
        Close #1 O)?0G$0  
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        Print "Finished merging RPC data for sample " & sampName 1['A1 ,  
        Print "FRED formatted data file: " & Chr(9) & outFile 0%GWc}o  
    End Sub 6 s/O\A  
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    'Utility function to read the contents of a file into an array of strings. 6Xa2A 6  
    Function ReadFile(ByVal fileName As String, _ rv[\2@}  
                      ByRef lineArray() As String) As Long q]aRJ`9f  
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        ReadFile = -1 &+sN= J.x  
        Dim oFSO As Object  S_atEmQ  
        Set oFSO = CreateObject("Scripting.FileSystemObject") +y2*[  
        Erase lineArray $i hI Hl6'  
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        Dim fid As Long L r,$98Dy  
        If oFSO.fileexists( fileName ) Then >_".  
            fid = FreeFile() 0qv)'[O  
            Open fileName For Input As fid l#Tm`br  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) KRQ/wuv  
            Close fid )8_0d)  
        End If ,DjZDw  
        Set oFSO = Nothing 0WFZx Ad"  
        Return UBound( lineArray ) n.)-aRu[  
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    End Function BsAglem  
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    Sub GetFileList( ByVal in_dir As String, _ F^ f]*MhT"  
                     ByRef in_flist() As String ) ETIf x)B-  
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        'Redimension the file list array ;Mc}If*  
        Erase in_flist 0-FbV,:;  
    *VpQ("  
        'Tracks how many files are found tPUQ"S  
        Dim fCount As Long LTF%b AQ,  
        fCount = 0 !(]|!F[m  
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        'Recurse directory and search for text files ,/KHKLY7  
        Dim f As String {>:2Ff]O:  
        f = Dir$(in_dir & "*.txt") 9:Y\D.M  
        While f <> "" REJ}T:  
            ReDim Preserve in_flist(fCount) 3+Q6<MS q  
            in_flist(fCount) = f Vo\d&}Q  
            fCount += 1 * PZ=$>r  
            f = Dir$() ZE9*i}r  
        Wend 4DNZ y2`  
        ReDim Preserve in_flist(fCount-1) k$hWR;U  
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    End Sub dZm{?\^_  
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