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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: 07-22
    摘要 4/HY[FT  
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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 "M9TB. O  
    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。 %="~\1y  
    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。 nszpG1U:  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 :k ME  
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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。 x1m8~F  
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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) C3 gZ6m  
    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 #$rf-E5g-K  
    例如下所示: Z7/vrME6  
    Sample name:  EDF-C1-56 I"8d5a}  
    Merging data from file EDF-C1-56 0-0.txt Ynv9&P  
    Finished merging RPC data for sample EDF-C1-56 *D=K{bUe'  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 69[V <1  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 \#\`!L[1  
    a. 创建一个新的散射库 NK+FQ^m[  
    b. 散射模型命名 <S\;k@f  
    c. 改变散射模型为“Tabulated BSDF”. gB/;clCdX)  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) lSn5=^]q  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ]PR|d\O  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 `"xk,fVYd  
    g. 点击OK O%YjWb  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 QO5OnYh  
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    脚本代码 W:VW_3  
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    '#Language "WWB-COM" ojN`#%X  
    !: m`9o8  
    Option Explicit gf:vb*#Wa  
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    Sub Main ?*CRa$_I|  
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        'Cleanup _wm~}_Q  
        ClearOutputWindow() CCuxC9i7  
    !(W[!%  
        Print "Merging RPC Photonics BSDF Data Files"  4]"a;(  
        SetTextColor(255,0,0) i'Y-V]->  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." @ \!KF*v  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." W:`5nj]H9  
        SetTextColor(0,0,0) Z -pyFK\  
    ge^!F>whr  
        'Current directory of this script (should be the same as the text files being merged) tW:W&|q  
        Dim cDir As String P7}t lHX  
        cDir = MacroDir$ & "\" xM%H~(  
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        'Array which will be populated with the list of files to be merged AiY|O S3R  
        Dim fList() As String, curFile As String qzz[y#q(  
        GetFileList( cDir, fList ) jZa25Z00  
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        Print "" ])N|[|$  
        Print "Files found for merging:" .KFA218h*x  
        For Each curFile In fList ;rNd701p"  
            Print Chr(9) & curFile p:Iw%eZ:  
        Next NU|qX {-  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. CI IY|DI`l  
        Dim nameArray() As String, sampName As String ''_,S,.a20  
        nameArray = Split(fList(0)," 0-0.txt") H9sZR>(^  
        sampName  = nameArray(0) gB>(xY>LrA  
        Print "" O-i4_YdVt  
        Print "Sample name: " & Chr(9) & sampName D._{E*vg  
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        'Open an output file and write the FRED header data -_s%8l^  
        Dim outFile As String d "2wO[  
        outFile = cDir & sampName & "_FRED.txt" =nLO?qoe  
        Open outFile For Output As #1 mRwXN*Izw  
        Print #1, "type bsdf_data" s5Pq$<  
        Print #1, "format angles=deg bsdf=value scale=1" &8Zeq3~  
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        'Loop the file list, skip the two header lines and write the remaining data to file R'Sa?6xS4  
        Dim lineArray() As String, curLine As Long >+L7k^[,0  
        For Each curFile In fList aZP 2R"  
            Print "Merging data from file " & curFile :){)JZ}-95  
            ReadFile( cDir & curFile, lineArray ) bi+9R-=&  
            For curLine = 2 To UBound(lineArray) Cm^Yl p  
                Print #1, lineArray(curLine) Xc{ZN1 4n  
            Next 9`&?hi49nK  
        Next ol50d73B  
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        'Close the output file I[@ts!YD  
        Close #1 :*=Ns[Y  
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        Print "Finished merging RPC data for sample " & sampName 'CgV0&@  
        Print "FRED formatted data file: " & Chr(9) & outFile kl=xu3j  
    End Sub </,.K`''W  
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    'Utility function to read the contents of a file into an array of strings. K6-6{vt  
    Function ReadFile(ByVal fileName As String, _ 'gYg~=  
                      ByRef lineArray() As String) As Long (/-lV&eR  
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        ReadFile = -1 nkTYWw  
        Dim oFSO As Object iZC>)&ax  
        Set oFSO = CreateObject("Scripting.FileSystemObject") F9%,MSt  
        Erase lineArray 7vw;Egd@@-  
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        Dim fid As Long /\d(c/,4  
        If oFSO.fileexists( fileName ) Then Zgy7!AF!  
            fid = FreeFile() aFyh,  
            Open fileName For Input As fid >d#3|;RY  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) Sg_O?.r  
            Close fid [O(m/  
        End If u >4ArtF  
        Set oFSO = Nothing uj)yk*  
        Return UBound( lineArray ) "$r 1$mBi  
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    End Function r|<6Aae&  
    \Y+")  
    Sub GetFileList( ByVal in_dir As String, _ ;uK";we  
                     ByRef in_flist() As String ) .8K6C]gw  
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        'Redimension the file list array Gy9 $Wj  
        Erase in_flist lirNYJ]tO  
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        'Tracks how many files are found 0 k9<&  
        Dim fCount As Long CG.,/]_  
        fCount = 0 UoHd-  
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        'Recurse directory and search for text files ;?zF6zvQ  
        Dim f As String *Z; r B  
        f = Dir$(in_dir & "*.txt") Je 31".  
        While f <> "" *,0+RASvq  
            ReDim Preserve in_flist(fCount) ?,>5[Ha^?  
            in_flist(fCount) = f V:OiW"/  
            fCount += 1 Y([d;_#P  
            f = Dir$() i-]U+m*  
        Wend yyjw?#\8  
        ReDim Preserve in_flist(fCount-1) O>%$q8x@i  
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    End Sub []gRfM]$&  
     
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