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    [技术]RPC Photonics扩散片BSDF [复制链接]

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    离线infotek
     
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    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 :~ &#9  
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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 7j(gW  
    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。 r^ '  
    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。 bweAmSs  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 YUyYVi7clq  
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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。 L. S/Mv  
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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) EN,}[^Z  
    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 7 <K=G2_:  
    例如下所示:  H =&K_  
    Sample name:  EDF-C1-56 \ NKw,`/  
    Merging data from file EDF-C1-56 0-0.txt YM.  
    Finished merging RPC data for sample EDF-C1-56 ~EvGNnTL  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Zw<<p|{)<  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 >66 `hZ  
    a. 创建一个新的散射库 7&w[h4Lw  
    b. 散射模型命名 [o7Qr?RN  
    c. 改变散射模型为“Tabulated BSDF”. Ysw&J}6e  
    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 ) ta'wX   
    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。 6?JvvS5  
    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 VCIV*5 P  
    g. 点击OK /#q6.du  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 `_]UlI_h  
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    脚本代码 ` 7?EE1o  
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    '#Language "WWB-COM" fhC|=0XB  
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    Option Explicit lg{/5gQG  
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    Sub Main w02C1oGfx  
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        'Cleanup |8)\8b|VuC  
        ClearOutputWindow() a6;5mx  
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        Print "Merging RPC Photonics BSDF Data Files" (rq(y$N  
        SetTextColor(255,0,0) mHH>qW{`  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 'tjqfR  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." 9g.5:  
        SetTextColor(0,0,0) wLvM<p7OX  
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        'Current directory of this script (should be the same as the text files being merged) ][YC.J  
        Dim cDir As String k[@/N+;")`  
        cDir = MacroDir$ & "\" ::-*~CH)  
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        'Array which will be populated with the list of files to be merged 1 (e64w@  
        Dim fList() As String, curFile As String 8= =_43  
        GetFileList( cDir, fList ) b&AeIU}&  
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        Print "" 7" )~JBH  
        Print "Files found for merging:" IA`Lp3Z  
        For Each curFile In fList 'q@vTM'-  
            Print Chr(9) & curFile +/" \.wYv  
        Next j[dgY1yE:  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. I<+:Ho=6  
        Dim nameArray() As String, sampName As String \eRct_  
        nameArray = Split(fList(0)," 0-0.txt") D6C h6i5$  
        sampName  = nameArray(0) Q^* 3 3  
        Print "" s%RG_"l  
        Print "Sample name: " & Chr(9) & sampName Q8.LlE999  
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        'Open an output file and write the FRED header data Vjd>j; H  
        Dim outFile As String da@W6Ovx  
        outFile = cDir & sampName & "_FRED.txt" _6g(C_m'T?  
        Open outFile For Output As #1 Jje!*?&8X  
        Print #1, "type bsdf_data" %36@1l-N  
        Print #1, "format angles=deg bsdf=value scale=1" 8xkLfN|N=  
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        'Loop the file list, skip the two header lines and write the remaining data to file s#(%u t  
        Dim lineArray() As String, curLine As Long T8yMaC  
        For Each curFile In fList !fjB oK+  
            Print "Merging data from file " & curFile 4=N(@mS  
            ReadFile( cDir & curFile, lineArray ) yM,Y8^  
            For curLine = 2 To UBound(lineArray) jdx T662q  
                Print #1, lineArray(curLine) Iyb_5 UmpF  
            Next rZE+B25T~  
        Next {kr14 l*2  
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        'Close the output file S,Tc\}  
        Close #1 Z9Z\2t  
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        Print "Finished merging RPC data for sample " & sampName -=ZDfM  
        Print "FRED formatted data file: " & Chr(9) & outFile EBr?>hl  
    End Sub c@J@*.q]   
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    'Utility function to read the contents of a file into an array of strings. ,_Kr}RH  
    Function ReadFile(ByVal fileName As String, _ HV*;Yt  
                      ByRef lineArray() As String) As Long ]b:>7_la  
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        ReadFile = -1 c]/S<w<  
        Dim oFSO As Object FW|_8q?}<  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 4yjIR?  
        Erase lineArray 'g3T'2"`5  
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        Dim fid As Long l,zhBnD  
        If oFSO.fileexists( fileName ) Then &So1;RR,_M  
            fid = FreeFile() ?GW}:'z  
            Open fileName For Input As fid m(0X_& &?z  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) g(,^'; j  
            Close fid @PctBS<s  
        End If B-PX/Q  
        Set oFSO = Nothing 5}c8v2R:B  
        Return UBound( lineArray ) 0N$FIw2  
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    End Function II!~"-WH  
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    Sub GetFileList( ByVal in_dir As String, _ Y*S:/b~y  
                     ByRef in_flist() As String ) M |f V7g  
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        'Redimension the file list array |q z%6w=  
        Erase in_flist beSU[  
    Rd|8=`)  
        'Tracks how many files are found ZY@ntV?  
        Dim fCount As Long K<kl2#  
        fCount = 0 \ Ce*5h  
    /?($W|9+l  
        'Recurse directory and search for text files x*=1C,C  
        Dim f As String F\|4zM  
        f = Dir$(in_dir & "*.txt") 9%1J..c  
        While f <> "" k%Vprc  
            ReDim Preserve in_flist(fCount) N"suR}9%  
            in_flist(fCount) = f T[#q0bv  
            fCount += 1 -4zV yW S<  
            f = Dir$() Ks@c wY  
        Wend 1<5Ug8q  
        ReDim Preserve in_flist(fCount-1) ~E!kx  
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    End Sub $mh\`  
     
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