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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 h"'f~KM9a>  
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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 md_Ld /  
    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。 *Dn{MD7,M  
    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。 3o?Lz7L  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 zf!c  
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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。 N+tS:$V  
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    图2. RPC Photonics工程漫射体不同类型的散射数据
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    2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) _&M>f?l  
    3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 :K~7BJ(HO  
    例如下所示: \<8!b {F  
    Sample name:  EDF-C1-56 w;_Ds  
    Merging data from file EDF-C1-56 0-0.txt u>eu47"n!  
    Finished merging RPC data for sample EDF-C1-56 uqnZ  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ZQ:Y5 ph  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 l{R)yTO  
    a. 创建一个新的散射库 p<jr&zVEc>  
    b. 散射模型命名 l ghzd6  
    c. 改变散射模型为“Tabulated BSDF”. aJF`rLm  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) H0HYb\TX?  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 jQDxbkIuzE  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 pg<>Ow5,~l  
    g. 点击OK 0(kp>%mbB  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 E%e-R6gl  
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    脚本代码 S6QG:|#P  
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    '#Language "WWB-COM" YszhoHYh  
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    Option Explicit Dmw,Bi*  
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    Sub Main 7jPmI  
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        'Cleanup phdN9<Z  
        ClearOutputWindow() /[s$A?  
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        Print "Merging RPC Photonics BSDF Data Files" '3Ri/V,  
        SetTextColor(255,0,0) jt3SA [cy  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." tFwlx3  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." L:<'TXsRA  
        SetTextColor(0,0,0) *v9G#[gG  
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        'Current directory of this script (should be the same as the text files being merged) qha<.Ro  
        Dim cDir As String by<2hLB9Q  
        cDir = MacroDir$ & "\" B_S3}g<~  
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        'Array which will be populated with the list of files to be merged Ua]zTMI  
        Dim fList() As String, curFile As String 0#JBz\  
        GetFileList( cDir, fList ) kD>vQ?  
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        Print "" pr"flRQr#  
        Print "Files found for merging:" 1<83MO;  
        For Each curFile In fList $W]bw#NH  
            Print Chr(9) & curFile CmTJa5:  
        Next dUZ&Ty^{  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Ba6xkEd  
        Dim nameArray() As String, sampName As String Pz 'Hqvd  
        nameArray = Split(fList(0)," 0-0.txt") J[l K  
        sampName  = nameArray(0) zvD5i,I  
        Print "" m%&B4E#3T  
        Print "Sample name: " & Chr(9) & sampName +[ zo2lBx  
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        'Open an output file and write the FRED header data 9:> K!@  
        Dim outFile As String rx/6x(3  
        outFile = cDir & sampName & "_FRED.txt" m 5Kx}H~  
        Open outFile For Output As #1 [7V]=] p  
        Print #1, "type bsdf_data" brWt  
        Print #1, "format angles=deg bsdf=value scale=1" N,|oV|i  
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        'Loop the file list, skip the two header lines and write the remaining data to file ~}w 8UO  
        Dim lineArray() As String, curLine As Long n&]w* (,  
        For Each curFile In fList fm0 (  
            Print "Merging data from file " & curFile jH1~Ve+q9  
            ReadFile( cDir & curFile, lineArray ) [w f12P  
            For curLine = 2 To UBound(lineArray) $b} +5  
                Print #1, lineArray(curLine) &UR/Txnu  
            Next e=jO_[  
        Next .Q@"];wH  
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        'Close the output file =&b[V"  
        Close #1 =HHg:"  
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        Print "Finished merging RPC data for sample " & sampName YqgW8 EM  
        Print "FRED formatted data file: " & Chr(9) & outFile 3)Y:c2  
    End Sub ;\+0H$  
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    'Utility function to read the contents of a file into an array of strings. 7 w,FA  
    Function ReadFile(ByVal fileName As String, _ OB22P%  
                      ByRef lineArray() As String) As Long LS'=>s"  
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        ReadFile = -1 Y=Qf!Cq]  
        Dim oFSO As Object k#xpY!'7  
        Set oFSO = CreateObject("Scripting.FileSystemObject") "Ycd$`{Vgt  
        Erase lineArray sjm79/  
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        Dim fid As Long mC`! \"w  
        If oFSO.fileexists( fileName ) Then _+iz?|U  
            fid = FreeFile() AHJ;>"]  
            Open fileName For Input As fid U.OX*-Cd  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) Oy$BR <\  
            Close fid W?-BT >#s  
        End If Ah {pidUx  
        Set oFSO = Nothing ;4$C$r!t  
        Return UBound( lineArray ) "6Uj:9  
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    End Function B_glyC  
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    Sub GetFileList( ByVal in_dir As String, _ Ir #V2]$  
                     ByRef in_flist() As String ) #Ca's'j&f  
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        'Redimension the file list array om?CFl  
        Erase in_flist _`>7 Q) ,7  
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        'Tracks how many files are found \[1CDz=}1  
        Dim fCount As Long yuEOQ\!(u  
        fCount = 0 shIi,!bZ  
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        'Recurse directory and search for text files K-C-+RB  
        Dim f As String }TJ|d=  
        f = Dir$(in_dir & "*.txt") =pyZ^/}P  
        While f <> "" 9t.yP;j\Y  
            ReDim Preserve in_flist(fCount) 8p{  
            in_flist(fCount) = f #l#[\6  
            fCount += 1 /? 1Yf  
            f = Dir$() jMui+G(h  
        Wend <Cu?$  
        ReDim Preserve in_flist(fCount-1) 9Pk3}f)a  
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    End Sub D*'M^k|1  
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