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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 b{]z w pf  
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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 p|&Yku=  
    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。 w &(|e <  
    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。 }7 c[Q($K  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 !`M|C?b  
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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。 HLZ;8/|48m  
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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) .b6VQCS~9  
    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 6Qy@UfB  
    例如下所示: h?;T7|^  
    Sample name:  EDF-C1-56 >w^YO25q  
    Merging data from file EDF-C1-56 0-0.txt @>)r}b  
    Finished merging RPC data for sample EDF-C1-56 vWf; 'j  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt KNLfp1!  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ek}a}.3 {  
    a. 创建一个新的散射库 U}PiY"S<  
    b. 散射模型命名 Vy938qX   
    c. 改变散射模型为“Tabulated BSDF”. )Hk3A$6(  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) OSf}Q=BL  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 Q&eQQ6b^Ih  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 ~ y;6W0x  
    g. 点击OK W>p-u6u%E|  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 @Q/-s9b  
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    脚本代码 Lg*B>=  
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    '#Language "WWB-COM" naw0$kXTA  
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    Option Explicit S4h:|jLUF  
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    Sub Main x>*Drm 7  
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        'Cleanup s+EAB{w$  
        ClearOutputWindow() /i-J&*6_  
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        Print "Merging RPC Photonics BSDF Data Files" - qy6Un+  
        SetTextColor(255,0,0) g47-db"5  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." -!N&OZ+R   
        Print "Note: Do not run this script multiple times without deleting the output file between executions." nx^]>w  
        SetTextColor(0,0,0) 3rcKzS7  
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        'Current directory of this script (should be the same as the text files being merged) <B6&I$Wc+  
        Dim cDir As String JA'h4AXk  
        cDir = MacroDir$ & "\" 0;:.B j  
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        'Array which will be populated with the list of files to be merged [-;_ZFS{  
        Dim fList() As String, curFile As String <p\6AnkMr  
        GetFileList( cDir, fList ) 0VGPEKRh  
    ' )?f{  
        Print "" .Jrqm  
        Print "Files found for merging:" # P?6@\  
        For Each curFile In fList , 'ZD=4_  
            Print Chr(9) & curFile G_k~X"  
        Next o(r\E0 I  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. pm\x~3jHs  
        Dim nameArray() As String, sampName As String LK, bO|  
        nameArray = Split(fList(0)," 0-0.txt") .$%Soyr?,  
        sampName  = nameArray(0) CFqJ/ ''  
        Print "" k?z98 >4  
        Print "Sample name: " & Chr(9) & sampName K!'AkTW+-  
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        'Open an output file and write the FRED header data Zuw?58RE\  
        Dim outFile As String b D[!/'4eJ  
        outFile = cDir & sampName & "_FRED.txt" <X7FMNr[  
        Open outFile For Output As #1 ;M_o)OS3  
        Print #1, "type bsdf_data" #L{OV)a<  
        Print #1, "format angles=deg bsdf=value scale=1" ?I [8'  
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        'Loop the file list, skip the two header lines and write the remaining data to file e=Z, Jg  
        Dim lineArray() As String, curLine As Long kRTwaNDOD  
        For Each curFile In fList Ircp``g  
            Print "Merging data from file " & curFile oA =4=`  
            ReadFile( cDir & curFile, lineArray ) &Ibu>di4[  
            For curLine = 2 To UBound(lineArray) mN>h5G>a  
                Print #1, lineArray(curLine) =ZDAeVz3w  
            Next PB/IFsJ  
        Next <oWB0%  
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        'Close the output file VGceD$<  
        Close #1 -GqT7`:(H4  
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        Print "Finished merging RPC data for sample " & sampName dd\n8f  
        Print "FRED formatted data file: " & Chr(9) & outFile BwBm[jtP  
    End Sub VA9Gb 9  
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    'Utility function to read the contents of a file into an array of strings. H'LD}\K l  
    Function ReadFile(ByVal fileName As String, _ r ; xLP  
                      ByRef lineArray() As String) As Long ` bdZ/*E  
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        ReadFile = -1 PC[c/CoD  
        Dim oFSO As Object +\|Iu;w  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 2A\,-*pc  
        Erase lineArray e][B7wZ  
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        Dim fid As Long baP^<w^  
        If oFSO.fileexists( fileName ) Then ]6{*^4kX  
            fid = FreeFile() ,daKC  
            Open fileName For Input As fid |{@8m9JR  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) uFLx  
            Close fid FI<q@HF  
        End If g=2Rqi5  
        Set oFSO = Nothing +{/*z  
        Return UBound( lineArray ) sp ]zbX?  
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    End Function S=nP[s  
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    Sub GetFileList( ByVal in_dir As String, _ vk?skN@  
                     ByRef in_flist() As String ) 4lM8\Lr  
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        'Redimension the file list array gCN$}  
        Erase in_flist |<Gl91  
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        'Tracks how many files are found hTEx]# (  
        Dim fCount As Long jU3Z*Z)zN  
        fCount = 0 l%`F&8K  
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        'Recurse directory and search for text files vi|R(&  
        Dim f As String r)1'ePI"  
        f = Dir$(in_dir & "*.txt") %uoQ9lD'  
        While f <> "" h[?O+Z^  
            ReDim Preserve in_flist(fCount) OKP9CLg9  
            in_flist(fCount) = f VL/|tL>E^  
            fCount += 1 =e}H'5?!  
            f = Dir$() gi-Yqco  
        Wend E^rbcGJ  
        ReDim Preserve in_flist(fCount-1) sj8~?O  
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    End Sub d)[;e()  
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