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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 U#oe8(?#  
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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 NTRw:'  
    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。 $y !k)"k  
    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。 )^+v*=Dc-i  
    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]E:]2  
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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。 zx7*Bnu0  
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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) r!eCfV7  
    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 <UJgl{ -  
    例如下所示: #4h_(Y  
    Sample name:  EDF-C1-56 :[gM 5G  
    Merging data from file EDF-C1-56 0-0.txt Q1qf'u  
    Finished merging RPC data for sample EDF-C1-56 - #]?3*NO  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt sa\v9  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 g`KVF"8  
    a. 创建一个新的散射库 C3fSSa%b  
    b. 散射模型命名 s&S8P;K|  
    c. 改变散射模型为“Tabulated BSDF”. 9wLV\>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 ) XAuB.)|  
    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。 p#}38`  
    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 \m!swYy  
    g. 点击OK #84pRU~  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Q2;zve&Dl  
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    脚本代码 qX{m7  
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    '#Language "WWB-COM" h tbN7B(  
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    Option Explicit fRo_rj _  
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    Sub Main [T', ZLR|  
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        'Cleanup C)> ])'S  
        ClearOutputWindow() <Vp7G%"'W  
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        Print "Merging RPC Photonics BSDF Data Files" Yo:l@(  
        SetTextColor(255,0,0) 70! &  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 8;7Y}c  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." rkA0v-N6v  
        SetTextColor(0,0,0) DB'pRo+U  
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        'Current directory of this script (should be the same as the text files being merged) po_||NIY  
        Dim cDir As String Z~o*$tF/  
        cDir = MacroDir$ & "\" c_xtwdkL9  
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        'Array which will be populated with the list of files to be merged JDVMq=ui  
        Dim fList() As String, curFile As String Xr~6_N{J  
        GetFileList( cDir, fList ) SymSAq0$F  
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        Print "" oo7&.HWf  
        Print "Files found for merging:" !]Z> T5$  
        For Each curFile In fList a#W:SgE?Y  
            Print Chr(9) & curFile DsY-JBDvoz  
        Next tYyva  
    }NPF]P;  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. W#|]m=2W  
        Dim nameArray() As String, sampName As String QLo^6S5!  
        nameArray = Split(fList(0)," 0-0.txt") p2|c8n==  
        sampName  = nameArray(0) MJ[#Gq\0R  
        Print "" W5?F?Dp!v  
        Print "Sample name: " & Chr(9) & sampName k;:v~7VF  
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        'Open an output file and write the FRED header data ByeyUw  
        Dim outFile As String F.?`<7  
        outFile = cDir & sampName & "_FRED.txt" sChMIbq!Av  
        Open outFile For Output As #1 /h%<e  
        Print #1, "type bsdf_data" %[4/UD=7  
        Print #1, "format angles=deg bsdf=value scale=1" 5gW`;Cdbyc  
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        'Loop the file list, skip the two header lines and write the remaining data to file 8):I< }s#  
        Dim lineArray() As String, curLine As Long i0,{*LD%^  
        For Each curFile In fList ?UQVmE&  
            Print "Merging data from file " & curFile 8YraW|H  
            ReadFile( cDir & curFile, lineArray ) oM-{)rvQd  
            For curLine = 2 To UBound(lineArray) ([UuO}m-  
                Print #1, lineArray(curLine) )gV+BHK  
            Next lDV8<  
        Next j11\t  
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        'Close the output file JU:!lyd  
        Close #1 zB\g'F/  
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        Print "Finished merging RPC data for sample " & sampName ]>/YU*\  
        Print "FRED formatted data file: " & Chr(9) & outFile [y}/QPR  
    End Sub ]R}#3(]1  
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    'Utility function to read the contents of a file into an array of strings. <1&kCfE&  
    Function ReadFile(ByVal fileName As String, _ #NNj#  
                      ByRef lineArray() As String) As Long .=rv,PWjZ  
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        ReadFile = -1 L@S"c (  
        Dim oFSO As Object 5}9-)\8=z  
        Set oFSO = CreateObject("Scripting.FileSystemObject") [6 wI22  
        Erase lineArray 3XY$w&f  
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        Dim fid As Long "%urT/F v&  
        If oFSO.fileexists( fileName ) Then jM1_+Lm1  
            fid = FreeFile() YS?P A#  
            Open fileName For Input As fid H#k"[eZ  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) Di9yd  
            Close fid Zqd&EOm  
        End If J[YA1  
        Set oFSO = Nothing Y+iC/pd  
        Return UBound( lineArray ) <?52Svi}}  
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    End Function V-A^9AAPm  
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    Sub GetFileList( ByVal in_dir As String, _ tzi+A;>c(v  
                     ByRef in_flist() As String ) m<8j' [+  
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        'Redimension the file list array \bQ|O7s  
        Erase in_flist @<CJbFgJp  
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        'Tracks how many files are found , p1 (0i  
        Dim fCount As Long 6\ux;lksn*  
        fCount = 0 W euV+}\b  
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        'Recurse directory and search for text files ="@W)"r  
        Dim f As String =d~]*[8  
        f = Dir$(in_dir & "*.txt") BGOI$,  
        While f <> "" P.qD,$-  
            ReDim Preserve in_flist(fCount) M=yZ5~3  
            in_flist(fCount) = f ?#}=!$p  
            fCount += 1 dtA- 4Ndm  
            f = Dir$() dwrc"GK!o  
        Wend F Paj p  
        ReDim Preserve in_flist(fCount-1) 1GOa'bxm  
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    End Sub IS&`O= 7  
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