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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 R,(^fM  
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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 <ioX|.7ZX  
    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。 9F3`hJZRy>  
    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。 tZ(Wh  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 a-7nA  
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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。 s4w<X}O_  
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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)  3o/f#y  
    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 9t=erhUr  
    例如下所示: p_qH7W  
    Sample name:  EDF-C1-56 "5{\0CfS  
    Merging data from file EDF-C1-56 0-0.txt D4@=+  
    Finished merging RPC data for sample EDF-C1-56 `W"-jz5#=  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt -cG?lEh <  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Um%E/0j  
    a. 创建一个新的散射库 n 6oVx 5/  
    b. 散射模型命名 u{J:wb  
    c. 改变散射模型为“Tabulated BSDF”. ]t<%v_K  
    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 ) DD;PmIW  
    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。 ZgN*m\l  
    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 B^eea[  
    g. 点击OK 5^ pQ=Sgt  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 )Y)7p//  
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    脚本代码 b%AYYk)d?  
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    '#Language "WWB-COM" qD 2<-E&M/  
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    Option Explicit $U!w#|&  
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    Sub Main Ey)ox$  
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        'Cleanup 8amtTM  
        ClearOutputWindow() T_pE'U%[  
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        Print "Merging RPC Photonics BSDF Data Files" ; <3w ,r  
        SetTextColor(255,0,0) KPKby?qQ^  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." W C}mt%H*O  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." p_tMl%K  
        SetTextColor(0,0,0) @Yy=HV  
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        'Current directory of this script (should be the same as the text files being merged) b@nbXm]Z  
        Dim cDir As String T- JJc#  
        cDir = MacroDir$ & "\" l~!#<=.  
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        'Array which will be populated with the list of files to be merged ~d28"p.7  
        Dim fList() As String, curFile As String z.#gpTXD  
        GetFileList( cDir, fList ) B f[D&O  
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        Print "" 4ajBMgD]KG  
        Print "Files found for merging:" <PXA`]x~  
        For Each curFile In fList s|d L.@0,L  
            Print Chr(9) & curFile V.;0F%zks5  
        Next M,|o2'  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. R0{+Xd  
        Dim nameArray() As String, sampName As String Xig%Q~oMp  
        nameArray = Split(fList(0)," 0-0.txt") 0s= GM|y  
        sampName  = nameArray(0) _k _F  
        Print "" 9v0f4Pbxm  
        Print "Sample name: " & Chr(9) & sampName ]oZ$,2#;~  
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        'Open an output file and write the FRED header data R~)c(jj5  
        Dim outFile As String UIbVtJ  
        outFile = cDir & sampName & "_FRED.txt" %/s:G)  
        Open outFile For Output As #1 Ywlym\ [+  
        Print #1, "type bsdf_data" (iH5F9WO  
        Print #1, "format angles=deg bsdf=value scale=1" .GLotc  
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        'Loop the file list, skip the two header lines and write the remaining data to file cYW F)WAog  
        Dim lineArray() As String, curLine As Long C'kd>LAGu  
        For Each curFile In fList dEns|r  
            Print "Merging data from file " & curFile IB(5 &u.  
            ReadFile( cDir & curFile, lineArray ) a!4'}gHR  
            For curLine = 2 To UBound(lineArray) QfRt3\^`  
                Print #1, lineArray(curLine) *T*MLD]Q  
            Next >e"1a/2%>&  
        Next \/lH]u\x  
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        'Close the output file G$Z8k,g+<7  
        Close #1 N!^U{;X7/  
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        Print "Finished merging RPC data for sample " & sampName Qq^>7OU>Co  
        Print "FRED formatted data file: " & Chr(9) & outFile sm/l'e  
    End Sub &&TQ0w&T  
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    'Utility function to read the contents of a file into an array of strings. n+j'FfSz  
    Function ReadFile(ByVal fileName As String, _ o=4d2V%m  
                      ByRef lineArray() As String) As Long 0|HD(d`a  
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        ReadFile = -1 "P'W@  
        Dim oFSO As Object .u)Po;e`  
        Set oFSO = CreateObject("Scripting.FileSystemObject") .Mdxbs6.C  
        Erase lineArray :8jHN_u  
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        Dim fid As Long \<a(@#E*~  
        If oFSO.fileexists( fileName ) Then / IAK'/  
            fid = FreeFile() GYyP+7K4l[  
            Open fileName For Input As fid -E?h^J&U  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) Z#nj[r!l}  
            Close fid )# M*@e$k  
        End If YjoN: z`b  
        Set oFSO = Nothing jo0p/5;  
        Return UBound( lineArray ) )nTOIfP2  
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    End Function 0:Ak 4L6k  
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    Sub GetFileList( ByVal in_dir As String, _ {pm>F}Cwy  
                     ByRef in_flist() As String ) /DJyNf*  
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        'Redimension the file list array G}AfCd4  
        Erase in_flist cdf8YN0!  
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        'Tracks how many files are found  J$v0  
        Dim fCount As Long aB#qzrr['8  
        fCount = 0 CXb)k.L   
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        'Recurse directory and search for text files f'TdYG  
        Dim f As String b-;+&Rb  
        f = Dir$(in_dir & "*.txt") xW#r)aN]p  
        While f <> "" khyn4   
            ReDim Preserve in_flist(fCount) Y*dzoN.sW  
            in_flist(fCount) = f xmT(yv,  
            fCount += 1 m+s^K{k}  
            f = Dir$() S6 `4&0'  
        Wend l{E+j%  
        ReDim Preserve in_flist(fCount-1) }pTy mAN  
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    End Sub =pF 6  
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