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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 gV@xu)l  
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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 %_E5B6xi{  
    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。 mHMsK}=~  
    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。 HAO-|=c4  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 la{?&75]  
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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。 zdJPMNHg  
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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) LkJq Bg  
    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 TYuP EVEXZ  
    例如下所示: HCOsVTl,  
    Sample name:  EDF-C1-56 H,KH}25  
    Merging data from file EDF-C1-56 0-0.txt O;VqrO  
    Finished merging RPC data for sample EDF-C1-56 8x1!15Wiz  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt eFs5 l  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ;*qXjv& K  
    a. 创建一个新的散射库 i%133in  
    b. 散射模型命名 ^iEf"r  
    c. 改变散射模型为“Tabulated BSDF”. !=21K0~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 ) +iN!$zF5]  
    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。 ?3N/#  
    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 BMAWjEr  
    g. 点击OK waC i9  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 2f:hz  
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    脚本代码 Z%o.kd"  
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    '#Language "WWB-COM" z&!o1uq  
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    Option Explicit 9*iVv)jd  
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    Sub Main X{xkXg8h  
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        'Cleanup / w dvm4  
        ClearOutputWindow() Z=-#{{bv  
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        Print "Merging RPC Photonics BSDF Data Files" L`M{bRl+1  
        SetTextColor(255,0,0) < *iFVjSI(  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." <8%+-[(  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." >7a ENKOg:  
        SetTextColor(0,0,0) <EyJ $$  
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        'Current directory of this script (should be the same as the text files being merged) 7oLlRU  
        Dim cDir As String ~*h)`uM  
        cDir = MacroDir$ & "\" u@Gum|_=N  
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        'Array which will be populated with the list of files to be merged b?=r%D->w  
        Dim fList() As String, curFile As String XH0{|#hwN  
        GetFileList( cDir, fList ) fC^d@4ha  
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        Print "" q:vN3#=^qf  
        Print "Files found for merging:" fc:87ZR{K  
        For Each curFile In fList B7A.~' =  
            Print Chr(9) & curFile jY9tq[~/  
        Next i]zh8|">  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. , -d2wzhW  
        Dim nameArray() As String, sampName As String LCRWC`%&  
        nameArray = Split(fList(0)," 0-0.txt") #\F8(lZ  
        sampName  = nameArray(0) l+(B~v  
        Print "" fX:G;vYn  
        Print "Sample name: " & Chr(9) & sampName Z^F>sUMR  
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        'Open an output file and write the FRED header data /q]fG  
        Dim outFile As String LfnQcI$kO  
        outFile = cDir & sampName & "_FRED.txt" /jaO\t'q  
        Open outFile For Output As #1 3Qv9=q|[b  
        Print #1, "type bsdf_data"  r+]a  
        Print #1, "format angles=deg bsdf=value scale=1" S-6i5H"B&  
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        'Loop the file list, skip the two header lines and write the remaining data to file -K^(L #G  
        Dim lineArray() As String, curLine As Long /$8& r  
        For Each curFile In fList 2#`d:@r  
            Print "Merging data from file " & curFile K=sk1<>)m  
            ReadFile( cDir & curFile, lineArray ) ;rh =63g  
            For curLine = 2 To UBound(lineArray) 10dK%/6/O  
                Print #1, lineArray(curLine) }&ew}'*9)  
            Next kYS\TMt,C  
        Next EA:_PBZ  
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        'Close the output file T2T?)_f /  
        Close #1 <p_2&& ?  
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        Print "Finished merging RPC data for sample " & sampName } F*=+n  
        Print "FRED formatted data file: " & Chr(9) & outFile usugjx^p  
    End Sub F0'o!A#|(  
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    'Utility function to read the contents of a file into an array of strings. 78mJ3/?rC  
    Function ReadFile(ByVal fileName As String, _ ^3&-!<*  
                      ByRef lineArray() As String) As Long DqH]FS?]  
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        ReadFile = -1 n  8|  
        Dim oFSO As Object k"`^vV[{F  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ]%5gPfv[T  
        Erase lineArray Yj>\WH  
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        Dim fid As Long j]9,yi  
        If oFSO.fileexists( fileName ) Then t1l4mdp  
            fid = FreeFile() # b= *hi`E  
            Open fileName For Input As fid ^F"eHUg  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) N jA\*M9  
            Close fid GsWf$/iC:  
        End If `? f sU  
        Set oFSO = Nothing $)O\i^T  
        Return UBound( lineArray ) DV bY   
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    End Function 28,HZaXhc  
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    Sub GetFileList( ByVal in_dir As String, _ ukX KUYNm8  
                     ByRef in_flist() As String ) 4kLTKm:G  
    Q mz3GH@wg  
        'Redimension the file list array 1w?DSHe  
        Erase in_flist iHOvCrp+X  
    FwSV \N+#'  
        'Tracks how many files are found 62xAS#\K>  
        Dim fCount As Long 'P >h2^z  
        fCount = 0 W QyMM@#  
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        'Recurse directory and search for text files fPsUIlI/A  
        Dim f As String [%7oq;^J  
        f = Dir$(in_dir & "*.txt") `>$l2,  
        While f <> "" -+.-Ab7  
            ReDim Preserve in_flist(fCount) oMZ|)(7C  
            in_flist(fCount) = f Bdf]?s[]  
            fCount += 1 \E:l E/y  
            f = Dir$() $QuSmA<4lS  
        Wend o7 X5{  
        ReDim Preserve in_flist(fCount-1) WG*S:_?  
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    End Sub kv/mqKVr  
     
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