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infotek 2023-05-11 08:31

RPC Photonics扩散片BSDF

摘要 !;[cm|<E  
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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 zVSbEcr,C~  
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。 #fF~6wopV  
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。 uU7s4oJ|  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 =Wb!j18]  
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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。 > x$eKN  
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图2. RPC Photonics工程漫射体不同类型的散射数据
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) ,$lOQ7R1(  
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 U ?%1:-#F  
例如下所示: [CCj5N1/  
Sample name:  EDF-C1-56 3jH8pO^  
Merging data from file EDF-C1-56 0-0.txt *2$I, ~(P  
Finished merging RPC data for sample EDF-C1-56 jK#[r[q{  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ,gvv297  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 2g)W-M  
a. 创建一个新的散射库 .x 1&   
b. 散射模型命名 g?(h{r`  
c. 改变散射模型为“Tabulated BSDF”. c]qq *k#  
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 ) RV*7?y%3  
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。 q. %[!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, L_3undy,  
g. 点击OK f*+eu @  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 &=seIc>x@  
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脚本代码 >&1MD}  
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'#Language "WWB-COM" $@[`/Uh   
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Option Explicit v=(L>gg  
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Sub Main L5E|1T  
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    'Cleanup hkS K;  
    ClearOutputWindow() WVP^C71  
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    Print "Merging RPC Photonics BSDF Data Files" HzW`j"\  
    SetTextColor(255,0,0) E(5'vr0  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." y~&R(x~w  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ;8Z\bHQ>  
    SetTextColor(0,0,0) [OH9/ "  
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    'Current directory of this script (should be the same as the text files being merged) C *\ =Q  
    Dim cDir As String DI P(  
    cDir = MacroDir$ & "\" SA5 g~{"  
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    'Array which will be populated with the list of files to be merged ZfzUvN&!  
    Dim fList() As String, curFile As String [V\0P,l  
    GetFileList( cDir, fList ) g$++\%k&  
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    Print "" |@J:A!  
    Print "Files found for merging:" E^I|%F  
    For Each curFile In fList W9!EjXg  
        Print Chr(9) & curFile tgu}^TfKkg  
    Next kIHfLwh9N  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. hf2Q;n&V  
    Dim nameArray() As String, sampName As String dS7?[[pg9  
    nameArray = Split(fList(0)," 0-0.txt") NJEubC?  
    sampName  = nameArray(0) mk)F3[ ke  
    Print "" vOb=>  
    Print "Sample name: " & Chr(9) & sampName Q:.q*I!D<4  
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    'Open an output file and write the FRED header data =WaZy>n}7  
    Dim outFile As String #d+bld\  
    outFile = cDir & sampName & "_FRED.txt" L-7?:  
    Open outFile For Output As #1 UjNe0jt% s  
    Print #1, "type bsdf_data" vT*z3  
    Print #1, "format angles=deg bsdf=value scale=1" ,a N8`M  
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    'Loop the file list, skip the two header lines and write the remaining data to file WU:~T.Su  
    Dim lineArray() As String, curLine As Long lyBae?%&  
    For Each curFile In fList ?8cgQf$  
        Print "Merging data from file " & curFile }L.xt88  
        ReadFile( cDir & curFile, lineArray ) fc'NU(70c  
        For curLine = 2 To UBound(lineArray) gr\UI!]F  
            Print #1, lineArray(curLine) Fdgu=qMm  
        Next 3` ov?T(H  
    Next PZVh)6f"c  
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    'Close the output file &|;XLRHP}  
    Close #1 I]HrtI  
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    Print "Finished merging RPC data for sample " & sampName c/fU0cA@  
    Print "FRED formatted data file: " & Chr(9) & outFile n H)6mOYp  
End Sub &5]&6TD6  
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'Utility function to read the contents of a file into an array of strings. M2UF3xD   
Function ReadFile(ByVal fileName As String, _ +RXKI{0Km  
                  ByRef lineArray() As String) As Long Hw 7   
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    ReadFile = -1 (vX+ Yw  
    Dim oFSO As Object ^_6.*Mvx  
    Set oFSO = CreateObject("Scripting.FileSystemObject") DnbT<oEL  
    Erase lineArray W@R\m=e2  
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    Dim fid As Long (*{Y#XD{  
    If oFSO.fileexists( fileName ) Then #t.)4$  
        fid = FreeFile() [ML%u$-  
        Open fileName For Input As fid ,{"%-U#z  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) Gqe?CM  
        Close fid c{YBCWA  
    End If ^gP pmb<x  
    Set oFSO = Nothing LxWnPi ^  
    Return UBound( lineArray ) cg16|  
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End Function W4 v/,g>  
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Sub GetFileList( ByVal in_dir As String, _ 5F#Q1gP-  
                 ByRef in_flist() As String ) 4/6?wX  
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    'Redimension the file list array A 9 I5  
    Erase in_flist |y,%dFNLf  
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    'Tracks how many files are found 60 D0z  
    Dim fCount As Long P ?- #d\qi  
    fCount = 0 |?zFm mh  
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    'Recurse directory and search for text files >ZAb9=/M)F  
    Dim f As String ;+d2qbGd  
    f = Dir$(in_dir & "*.txt") m Mp(  
    While f <> "" k!9LJ%Xh  
        ReDim Preserve in_flist(fCount) rA<>k/a  
        in_flist(fCount) = f {51<EvyE*  
        fCount += 1 ^T(v4'7  
        f = Dir$() xqP DL9\  
    Wend An cka  
    ReDim Preserve in_flist(fCount-1) 7x 6q:4Ep\  
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End Sub I_QWdxn  
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