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    [技术]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: 昨天 07:54
    摘要 4[S0~O{r  
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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 CTbz?Kn  
    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。 CZ/bO#~  
    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。 Y]5\%JR  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 [3s p  
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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。 R|%R-J]  
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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) Q}J'S5%  
    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 5pBQ~m3  
    例如下所示: rpgr5>  
    Sample name:  EDF-C1-56 s_=/p5\  
    Merging data from file EDF-C1-56 0-0.txt _l&`* 2d  
    Finished merging RPC data for sample EDF-C1-56 |EJ&s393&  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt S^GB\uJ  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ~h~K"GbC?  
    a. 创建一个新的散射库 s<I[)FQVr  
    b. 散射模型命名 /`3^?zlu"  
    c. 改变散射模型为“Tabulated BSDF”. 'oZ/fUl|7  
    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 ) jhWNMu  
    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。 v5|X=B>&>  
    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 9E (VU.  
    g. 点击OK ^N!l$&=  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 1Ftl1uf  
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    脚本代码 =?`5n|A*  
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    '#Language "WWB-COM" Ojkbv  
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    Option Explicit  8@)/a  
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    Sub Main ;SzOa7  
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        'Cleanup Jy'ge4]3  
        ClearOutputWindow() ^;3z9}9  
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        Print "Merging RPC Photonics BSDF Data Files" "h/{YjUS  
        SetTextColor(255,0,0) -{>Nrx|  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." R>"E Xq  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." A/W-'%+`  
        SetTextColor(0,0,0) "HW~|M7>(  
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        'Current directory of this script (should be the same as the text files being merged) Ox"4 y  
        Dim cDir As String A6'G%of  
        cDir = MacroDir$ & "\" ?op6_a-wm  
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        'Array which will be populated with the list of files to be merged "Hmo`EB0  
        Dim fList() As String, curFile As String t;9f7~  
        GetFileList( cDir, fList ) S]Gw}d]4  
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        Print "" hu-fwBK  
        Print "Files found for merging:" h3issi+N  
        For Each curFile In fList ?lzg )88I  
            Print Chr(9) & curFile WlVC0&  
        Next cpB$bC](  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ;JpU4W2/  
        Dim nameArray() As String, sampName As String M_V\mYC8I  
        nameArray = Split(fList(0)," 0-0.txt") ^;B vd!  
        sampName  = nameArray(0) od |w)?16  
        Print "" w .l2  
        Print "Sample name: " & Chr(9) & sampName 5AR\'||u  
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        'Open an output file and write the FRED header data ([s}bD.9  
        Dim outFile As String HoGrvt<:.P  
        outFile = cDir & sampName & "_FRED.txt" pB{QO4q n  
        Open outFile For Output As #1 y";{k+  
        Print #1, "type bsdf_data" ;$(a+?  
        Print #1, "format angles=deg bsdf=value scale=1" >`8r52  
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        'Loop the file list, skip the two header lines and write the remaining data to file 1i9}mzy%  
        Dim lineArray() As String, curLine As Long &|xN=U/  
        For Each curFile In fList eKpH|S!x U  
            Print "Merging data from file " & curFile eJ>(SkR:[  
            ReadFile( cDir & curFile, lineArray ) ,U2 /J  
            For curLine = 2 To UBound(lineArray) o"t+G/M  
                Print #1, lineArray(curLine) vk+TWf  
            Next GiB3.%R`  
        Next N(Us9  
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        'Close the output file  N\DEY]  
        Close #1 UaCEh?D+Y  
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        Print "Finished merging RPC data for sample " & sampName $k*E^~qT  
        Print "FRED formatted data file: " & Chr(9) & outFile L #p-AK  
    End Sub nCEt*~t9VE  
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    'Utility function to read the contents of a file into an array of strings. ofl3G {u  
    Function ReadFile(ByVal fileName As String, _ -O3^q.   
                      ByRef lineArray() As String) As Long `N}<lg(0#  
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        ReadFile = -1 eh nN  
        Dim oFSO As Object ~m y\{q  
        Set oFSO = CreateObject("Scripting.FileSystemObject") ROr$ Sz  
        Erase lineArray ^-PlTmT  
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        Dim fid As Long k&ujr:)5Y5  
        If oFSO.fileexists( fileName ) Then e2;19bj&  
            fid = FreeFile() '@RlKMnN  
            Open fileName For Input As fid Fkj\U^G  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) !NK8_p|X  
            Close fid ;%odN d  
        End If 8$-Wz:X&  
        Set oFSO = Nothing ho ?.\Jq  
        Return UBound( lineArray ) VR2BdfKU,  
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    End Function c, \TL ]  
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    Sub GetFileList( ByVal in_dir As String, _ SQWwxFJ  
                     ByRef in_flist() As String ) dgE|*1/0  
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        'Redimension the file list array 2X;,s`)  
        Erase in_flist #JeZA0r5  
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        'Tracks how many files are found ;2@MPx  
        Dim fCount As Long %#2[3N{  
        fCount = 0 \06fP4?  
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        'Recurse directory and search for text files #*j  
        Dim f As String G+ Y`65  
        f = Dir$(in_dir & "*.txt") -o6K_R}R  
        While f <> "" ?Q wDV`  
            ReDim Preserve in_flist(fCount) }4ijLX>b  
            in_flist(fCount) = f B4pheKZ2  
            fCount += 1 G9:[W"P  
            f = Dir$() 5[]7baO)h1  
        Wend DoX#+ 07u4  
        ReDim Preserve in_flist(fCount-1) v$p<6^kJ  
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    End Sub (ScL  C  
     
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