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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 v JGH8$%;,  
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    RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。
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    背景 Be@g|'r  
    Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 JD0s0>q_  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 i&lW&]  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 y*X.DS 1(w  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 FWW@t1)  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) = FV12(U  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 \ [OB.  
    例如下所示: 7L&,Na  
    Sample name:  EDF-C1-56 9y&;6V.'  
    Merging data from file EDF-C1-56 0-0.txt 0n6eWwY  
    Finished merging RPC data for sample EDF-C1-56 Q njK<}M9  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ^j${#Q  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 HAI) +J   
    a. 创建一个新的散射库 WgR%mm^  
    b. 散射模型命名 C^,b aCX  
    c. 改变散射模型为“Tabulated BSDF”. fi>.X99(G  
    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 ) :Ob^b3<t  
    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。 O>h h  
    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 &l ]F&-  
    g. 点击OK wM N;<  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 *&IvEu  
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    脚本代码 +,YK}?e  
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    '#Language "WWB-COM" /v<Gt%3X  
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    Option Explicit kG5+kwV=:  
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    Sub Main *rw6?u9I  
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        'Cleanup Hpz1Iy @  
        ClearOutputWindow() zj2y=A| Y  
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        Print "Merging RPC Photonics BSDF Data Files" Wd!Z`,R  
        SetTextColor(255,0,0) k=kkF"  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." bXOM=T  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." b49h @G  
        SetTextColor(0,0,0) 8r"-3<*  
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        'Current directory of this script (should be the same as the text files being merged) hNYO+LrI)  
        Dim cDir As String ;:oJFI#;  
        cDir = MacroDir$ & "\" XX90 Is  
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        'Array which will be populated with the list of files to be merged ,.2qh|Ol  
        Dim fList() As String, curFile As String > r(`4M:  
        GetFileList( cDir, fList ) B f  y  
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        Print "" |ITCw$T  
        Print "Files found for merging:" V\L%*6O  
        For Each curFile In fList H)Me!^@[D  
            Print Chr(9) & curFile @N<h`vDa  
        Next A7#nBHwxZ  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ( 1  
        Dim nameArray() As String, sampName As String ?8s$RYp14  
        nameArray = Split(fList(0)," 0-0.txt") x\ # K2  
        sampName  = nameArray(0) r7V !M1  
        Print "" p`\>GWuT!  
        Print "Sample name: " & Chr(9) & sampName xH` VX-X3  
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        'Open an output file and write the FRED header data Tr}XG  
        Dim outFile As String C7W<7DBf  
        outFile = cDir & sampName & "_FRED.txt" ^+d]'$  
        Open outFile For Output As #1 wE<r'  
        Print #1, "type bsdf_data" P~lU`.X}  
        Print #1, "format angles=deg bsdf=value scale=1" Yc6.v8a  
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        'Loop the file list, skip the two header lines and write the remaining data to file +Tx_q1/f5X  
        Dim lineArray() As String, curLine As Long tmBt[  
        For Each curFile In fList 9a+Y )?z  
            Print "Merging data from file " & curFile 9* 3;v;F  
            ReadFile( cDir & curFile, lineArray ) {"$ [MYi:  
            For curLine = 2 To UBound(lineArray) -e0[$v  
                Print #1, lineArray(curLine) SvkCx>6/G  
            Next C,mfA%63  
        Next T+RC#&>  
    *]R5bj.!o  
        'Close the output file Fkpaou  
        Close #1 H0])>1sWB  
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        Print "Finished merging RPC data for sample " & sampName m:0[as=  
        Print "FRED formatted data file: " & Chr(9) & outFile s~>1TxJe  
    End Sub 0k5uqGLXe  
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    'Utility function to read the contents of a file into an array of strings. .=-a1p/  
    Function ReadFile(ByVal fileName As String, _ OXKV6r6f  
                      ByRef lineArray() As String) As Long A1Uy|Dl  
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        ReadFile = -1 m`$Q/SyvG  
        Dim oFSO As Object n`w]?bL  
        Set oFSO = CreateObject("Scripting.FileSystemObject") nq>F_h  
        Erase lineArray !kb:g]X  
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        Dim fid As Long Tjv'S <  
        If oFSO.fileexists( fileName ) Then ]=i('|YG  
            fid = FreeFile() :O&jm.2m  
            Open fileName For Input As fid BAvz @H  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 88S:E7 $  
            Close fid PP!-*~F0Jr  
        End If HIE8@Rv/3  
        Set oFSO = Nothing j6k"%QHf  
        Return UBound( lineArray ) (.Ak*  
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    End Function U~?mW,iRL  
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    Sub GetFileList( ByVal in_dir As String, _ =)g}$r &<  
                     ByRef in_flist() As String ) #%E^cGfY  
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        'Redimension the file list array $-t@=N@vO?  
        Erase in_flist , #GB  
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        'Tracks how many files are found |=,jom  
        Dim fCount As Long 2&]LZ:(  
        fCount = 0 $- %um  
    ]63! Wc  
        'Recurse directory and search for text files =6=:OId  
        Dim f As String yk5K8D[tV  
        f = Dir$(in_dir & "*.txt") yoF*yUls^E  
        While f <> "" gdqBT]j  
            ReDim Preserve in_flist(fCount)  #$2/<  
            in_flist(fCount) = f <,/7:n  
            fCount += 1 cjg~?R  
            f = Dir$() 4J(-~  
        Wend uCuB>x&  
        ReDim Preserve in_flist(fCount-1) w >2G@  
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    End Sub 0MxK+8\y  
     
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