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infotek 2020-12-15 09:37

RPC Photonics扩散片BSDF

摘要 TiiMX  
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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 "AH1)skB:  
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。 tqdw y.  
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。 ~j}7Fre  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 zoFCHs r  
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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。 yXg #<H6V  
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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) =u M2l  
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 XE/K|o^Hp  
例如下所示: }= )  
Sample name:  EDF-C1-56 {<\[gm\X  
Merging data from file EDF-C1-56 0-0.txt .nXOv]  
Finished merging RPC data for sample EDF-C1-56 GR@jn]50  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt E038p]M!  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ``l7|b jJ  
a. 创建一个新的散射库 .<GU2&;!  
b. 散射模型命名 GwHp@_>  
c. 改变散射模型为“Tabulated BSDF”. ^SdorPOq&  
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 ) K x7'm1  
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。 Aqi9@BH  
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, LP_w6fjT  
g. 点击OK K0681_bp  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 f@:.bp8VB8  
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脚本代码 MiB"CcU  
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'#Language "WWB-COM" B?;!j)FUtt  
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Option Explicit )ad-p.Hus  
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Sub Main G}MJWf Hl  
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    'Cleanup \YV`M3O  
    ClearOutputWindow() JqX+vRY;dd  
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    Print "Merging RPC Photonics BSDF Data Files" !F@9xG  
    SetTextColor(255,0,0) t-, =sV  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." *b< a@  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ]`p*ZTr)\  
    SetTextColor(0,0,0) *U[Nn5#?  
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    'Current directory of this script (should be the same as the text files being merged) jHP6d =  
    Dim cDir As String VR/*h%  
    cDir = MacroDir$ & "\" }ioHSkCD  
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    'Array which will be populated with the list of files to be merged ]KsL(4PY  
    Dim fList() As String, curFile As String :$=r^LSH  
    GetFileList( cDir, fList )  X`REhvT  
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    Print "" dnZA+Pa  
    Print "Files found for merging:" U{^~X_?  
    For Each curFile In fList x)+3SdH  
        Print Chr(9) & curFile bZf18lvij:  
    Next yXuc< m  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 7'pmW,;  
    Dim nameArray() As String, sampName As String W7k0!Grrl  
    nameArray = Split(fList(0)," 0-0.txt") W,\LdQ  
    sampName  = nameArray(0) h3}gg@Fm  
    Print "" `i'72\(  
    Print "Sample name: " & Chr(9) & sampName %xa.{`}`U  
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    'Open an output file and write the FRED header data nDt1oM H  
    Dim outFile As String YPq4VX,  
    outFile = cDir & sampName & "_FRED.txt" mJj [f8  
    Open outFile For Output As #1 BCrX>Pp }r  
    Print #1, "type bsdf_data" 7q%<JZPY  
    Print #1, "format angles=deg bsdf=value scale=1" n0/H2>I[  
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    'Loop the file list, skip the two header lines and write the remaining data to file &zGf`Zi6*%  
    Dim lineArray() As String, curLine As Long Rh=,]Y  
    For Each curFile In fList \]@XY_21  
        Print "Merging data from file " & curFile M/O4JZEqh  
        ReadFile( cDir & curFile, lineArray ) ZSB_OS[N  
        For curLine = 2 To UBound(lineArray) X {["4  
            Print #1, lineArray(curLine) UJ}Xa&*H\  
        Next ^oL43#Nlo  
    Next N2 vA/  
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    'Close the output file XAn{xN pz  
    Close #1 lur$?_gt  
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    Print "Finished merging RPC data for sample " & sampName ]bPj%sb*@  
    Print "FRED formatted data file: " & Chr(9) & outFile 3)? v  
End Sub mKsTA;  
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'Utility function to read the contents of a file into an array of strings. "*ot:;I  
Function ReadFile(ByVal fileName As String, _ *%{  
                  ByRef lineArray() As String) As Long (%i)A$i6a  
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    ReadFile = -1 m|7lDfpb  
    Dim oFSO As Object 0%K/gd#S<  
    Set oFSO = CreateObject("Scripting.FileSystemObject") +IRr&J*P  
    Erase lineArray =LFrV9  
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    Dim fid As Long yq?7!X  
    If oFSO.fileexists( fileName ) Then &~%( RO  
        fid = FreeFile() :9_N Y"P  
        Open fileName For Input As fid 86]})H  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) H1FD|Q3  
        Close fid ?8j#gYx2  
    End If UL46%MFQ\  
    Set oFSO = Nothing FXAP]iqo  
    Return UBound( lineArray ) i8]2y  
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End Function mt0ZD}E  
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Sub GetFileList( ByVal in_dir As String, _ d )}@0Q  
                 ByRef in_flist() As String ) l$i^e|*  
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    'Redimension the file list array /c`s$h4-  
    Erase in_flist 4\#!Gv-  
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    'Tracks how many files are found 'CrBxaA]s  
    Dim fCount As Long v Ft]n  
    fCount = 0 RWN2 P6  
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    'Recurse directory and search for text files cH5@Jam  
    Dim f As String c]pO'6]  
    f = Dir$(in_dir & "*.txt") ,%|$# g 0  
    While f <> "" :4{;^|RgU  
        ReDim Preserve in_flist(fCount) EmaVd+Sw  
        in_flist(fCount) = f Bn[5M [  
        fCount += 1 cY}Nr#%s@U  
        f = Dir$() aCL_cVOMR  
    Wend Is87 9_Z  
    ReDim Preserve in_flist(fCount-1) $U uSrX&  
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End Sub w|"cf{$^x  
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