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infotek 2025-07-22 07:54

RPC Photonics扩散片BSDF

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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 r\T'_wo  
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。 AEd]nVV Q  
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。 vN9R. R  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 v8l3{qq  
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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。 N@#,YnPI  
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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) %urd;h D  
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 r t0_[i  
例如下所示: \"pp-str  
Sample name:  EDF-C1-56 pv]2"|]V)  
Merging data from file EDF-C1-56 0-0.txt 6^e}^~|  
Finished merging RPC data for sample EDF-C1-56 `n?Rxhkwp  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt e);`hNLih  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面  35%\"Y?  
a. 创建一个新的散射库 iY*fp=c9  
b. 散射模型命名 +3F%soum95  
c. 改变散射模型为“Tabulated BSDF”. `Kbf]"4q  
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 ) dym K@  
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。 ?[<#>,W  
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, cDIZkni=  
g. 点击OK Qo~|[]GE  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 U'aJCM  
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脚本代码 =Hbf()cN)  
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'#Language "WWB-COM" -v! ;  
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Option Explicit R-YNg  
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Sub Main \`;1[m  
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    'Cleanup k+BY3a  
    ClearOutputWindow() *,|x p  
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    Print "Merging RPC Photonics BSDF Data Files" {T-=&%||  
    SetTextColor(255,0,0) ot0g@q[3  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." lK_T%1Gz  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." q|V|Jl  
    SetTextColor(0,0,0) UD=[::##  
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    'Current directory of this script (should be the same as the text files being merged) 6 2#@Y-5  
    Dim cDir As String `S+n,,l  
    cDir = MacroDir$ & "\" 2@W`OW Njm  
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    'Array which will be populated with the list of files to be merged t$ 97[ay  
    Dim fList() As String, curFile As String vi.INe  
    GetFileList( cDir, fList ) . '>d7  
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    Print "" h=Q2 ?O8  
    Print "Files found for merging:" V?)YQ B  
    For Each curFile In fList lid0 YK-  
        Print Chr(9) & curFile Q zg?#|  
    Next %(|-+cLW+  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 31\mF\{V  
    Dim nameArray() As String, sampName As String k[)/,1  
    nameArray = Split(fList(0)," 0-0.txt") =YIosmr  
    sampName  = nameArray(0) 'P*OzZ4>$  
    Print "" T% GR{mp  
    Print "Sample name: " & Chr(9) & sampName , `PYU[  
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    'Open an output file and write the FRED header data LP !d|X  
    Dim outFile As String HQwrb HS  
    outFile = cDir & sampName & "_FRED.txt" 0"Euf41  
    Open outFile For Output As #1 R;pIi/yDRe  
    Print #1, "type bsdf_data" `6RccEm  
    Print #1, "format angles=deg bsdf=value scale=1" V>`9ey!U  
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    'Loop the file list, skip the two header lines and write the remaining data to file VCVKh  
    Dim lineArray() As String, curLine As Long \TYVAt] ?  
    For Each curFile In fList K:A:3~I!NW  
        Print "Merging data from file " & curFile L)8%*X  
        ReadFile( cDir & curFile, lineArray ) f'bwtjO  
        For curLine = 2 To UBound(lineArray) >6Jz=N,  
            Print #1, lineArray(curLine) Q~/=p>=uu  
        Next "&{.g1i9  
    Next 8 &v)Vi-  
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    'Close the output file :wEy""*N0  
    Close #1 f$5\ b[O  
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    Print "Finished merging RPC data for sample " & sampName !x\\# 9  
    Print "FRED formatted data file: " & Chr(9) & outFile NB5lxaL  
End Sub F@HJ3O9  
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'Utility function to read the contents of a file into an array of strings. GvvKM=1  
Function ReadFile(ByVal fileName As String, _ 6oFA=CjU{  
                  ByRef lineArray() As String) As Long \%9QE  
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    ReadFile = -1 11 k}Ly  
    Dim oFSO As Object +~* e B  
    Set oFSO = CreateObject("Scripting.FileSystemObject") |j{]6Nu  
    Erase lineArray fQwLx  
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    Dim fid As Long $e{[fm x  
    If oFSO.fileexists( fileName ) Then fdHFSnQ g  
        fid = FreeFile() 2<@g *  
        Open fileName For Input As fid 2kk; z0f  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) ;@:-T/=  
        Close fid o\PHs4Ws'7  
    End If rg=Ym.  
    Set oFSO = Nothing F@#p  
    Return UBound( lineArray ) ;.rY`<|  
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End Function P!IXcPKW53  
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Sub GetFileList( ByVal in_dir As String, _ n ywC]T  
                 ByRef in_flist() As String ) ?>I  
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    'Redimension the file list array 1 .[OS  
    Erase in_flist HV7f%U  
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    'Tracks how many files are found G1*,~1i  
    Dim fCount As Long _y sakn  
    fCount = 0 g$vOWSI +  
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    'Recurse directory and search for text files 6#.9T;&  
    Dim f As String _ b</ ::Tp  
    f = Dir$(in_dir & "*.txt") 86!$<!I  
    While f <> "" ]=]MJ3_7  
        ReDim Preserve in_flist(fCount) +?[s"(  
        in_flist(fCount) = f 3OY(L`  
        fCount += 1 ):nC%0V  
        f = Dir$() ?<5KLvGv  
    Wend H0yM`7[y  
    ReDim Preserve in_flist(fCount-1) $9xp@8b\_  
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End Sub !, rF(pz  
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