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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 5hh6;)  
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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 Dy:r)\KX  
    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。 $<"I*l@  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 ah,"c9YX  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 Q3Y(K\  
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    1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 R&$fWV;'  
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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) m4yWhUi(o  
    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 9 Q*:II  
    例如下所示: i52JY&N  
    Sample name:  EDF-C1-56 >UV}^OO  
    Merging data from file EDF-C1-56 0-0.txt 4?bvJJuf)  
    Finished merging RPC data for sample EDF-C1-56 > 6=3y4tP  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt z.+%{_pe  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Az-!X!O*f  
    a. 创建一个新的散射库 ;/kmV~KG  
    b. 散射模型命名 i g .  
    c. 改变散射模型为“Tabulated BSDF”. <;uM/vS i  
    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 ) oX'@,(6)  
    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。 +zXcTT[V  
    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 awjAv8tPO!  
    g. 点击OK VDxF%!h(  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 P]OUzI,  
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    脚本代码 0F.S[!I  
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    '#Language "WWB-COM" ; ), ,Hk  
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    Option Explicit YK5(oKFN  
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    Sub Main G}LV"0?  
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        'Cleanup _%23L|  
        ClearOutputWindow() W}%"xy]N  
    ~ Nf|,{[(5  
        Print "Merging RPC Photonics BSDF Data Files" JT=ax/%Mo  
        SetTextColor(255,0,0) l?YO!$  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." rq Uk_|Xa  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." >3~)2)Q  
        SetTextColor(0,0,0) 2m} bddS  
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        'Current directory of this script (should be the same as the text files being merged) * dk(<g=fM  
        Dim cDir As String "@|rU4Y  
        cDir = MacroDir$ & "\" t OxH9  
    B6KG\,'|  
        'Array which will be populated with the list of files to be merged 2$`Y 4b3t  
        Dim fList() As String, curFile As String ,}"jiGgS4  
        GetFileList( cDir, fList ) wp5H|ctl  
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        Print "" 4tx6h<L#s  
        Print "Files found for merging:" #!%zf{(C+  
        For Each curFile In fList [7g-M/jvY  
            Print Chr(9) & curFile TCIbPs E  
        Next ;*ULrX4[  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. MZB}O" r  
        Dim nameArray() As String, sampName As String ckv8QAm  
        nameArray = Split(fList(0)," 0-0.txt") H SGz-  
        sampName  = nameArray(0) s&<76kwl  
        Print "" $<Y%4LI  
        Print "Sample name: " & Chr(9) & sampName 3-)}.8F  
    N8x.D-=gG  
        'Open an output file and write the FRED header data NV@$\ <  
        Dim outFile As String (<-m|H};  
        outFile = cDir & sampName & "_FRED.txt" g+c%J#F=  
        Open outFile For Output As #1 wO`G_!W9  
        Print #1, "type bsdf_data" .+<Ka0  
        Print #1, "format angles=deg bsdf=value scale=1" n}fV$qu  
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        'Loop the file list, skip the two header lines and write the remaining data to file <[K)PI  
        Dim lineArray() As String, curLine As Long e@ $|xa")  
        For Each curFile In fList 98 ]pkqp4  
            Print "Merging data from file " & curFile gW9`k,U  
            ReadFile( cDir & curFile, lineArray ) U~t!   
            For curLine = 2 To UBound(lineArray) (0.JoeA`y  
                Print #1, lineArray(curLine) bNiJ"k<pN  
            Next 79-5 0}A  
        Next 5J1a8RBR  
    o^//|]H3Y  
        'Close the output file j]]5&u/l  
        Close #1 o)x&|0_  
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        Print "Finished merging RPC data for sample " & sampName J#t8xL  
        Print "FRED formatted data file: " & Chr(9) & outFile $J,$_O6  
    End Sub n%i L+I  
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    'Utility function to read the contents of a file into an array of strings. ~l{Qz0&  
    Function ReadFile(ByVal fileName As String, _ i~R+ g3oi  
                      ByRef lineArray() As String) As Long m\bmBK"I  
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        ReadFile = -1 LU`)  
        Dim oFSO As Object &-JIXVd*R  
        Set oFSO = CreateObject("Scripting.FileSystemObject") -1`}|t;  
        Erase lineArray 51H6 W/$  
    : yq2 XE%r  
        Dim fid As Long q;IuV&B  
        If oFSO.fileexists( fileName ) Then V[kn'QkWv  
            fid = FreeFile() ;l `Ufx  
            Open fileName For Input As fid Wa.!eAe}  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) *yo'Nqu  
            Close fid a|#pl!  
        End If P4c3kO0  
        Set oFSO = Nothing #o9CC)q5G  
        Return UBound( lineArray ) :(tKc3z  
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    End Function Q u7ML]e?z  
    ^P/OHuDL  
    Sub GetFileList( ByVal in_dir As String, _ rd$T6!I  
                     ByRef in_flist() As String ) -U?%A:,a|  
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        'Redimension the file list array b9 li   
        Erase in_flist "wKJ8  
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        'Tracks how many files are found _5O~ ]}  
        Dim fCount As Long hN gT/y8  
        fCount = 0 x_?K6[G&}  
    A&%7Z^Pp  
        'Recurse directory and search for text files .*>C[^  
        Dim f As String u|u)8;'9(  
        f = Dir$(in_dir & "*.txt") ~| ZAS]  
        While f <> "" 3pL4 Zhf  
            ReDim Preserve in_flist(fCount) M(C}2.20  
            in_flist(fCount) = f ) hoVB  
            fCount += 1 6"}F KRR  
            f = Dir$() gSyBoY  
        Wend KM"?l<x0Y  
        ReDim Preserve in_flist(fCount-1) i.?rom  
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    End Sub Nlwt}7  
     
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