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infotek 2021-10-26 09:58

RPC Photonics扩散片BSDF

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RPC Photonics扩散片BSDF
时间:2016-01-08 23:10来源:讯技光电作者: 技术部点击:次打印
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摘要 'c*Q/C;  
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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。 LuM:dJ  
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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。 P$ZIKkf  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 `U?" {;j {  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 l2vIKc  
图2. RPC Photonics工程漫射体不同类型的散射数据
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) Q>Voa&tYn  
3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 F7P?*!dx  
例如下所示: e&sZ]{uD  
Sample name:  EDF-C1-56 'APtY;x^{  
Merging data from file EDF-C1-56 0-0.txt "HX,RJ @^K  
Finished merging RPC data for sample EDF-C1-56 E w#UlA:"v  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ySAkj-< /P  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面
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a. 创建一个新的散射库 tIn dve  
b. 散射模型命名  kDbDG,O  
c. 改变散射模型为“Tabulated BSDF”. 9'nM$ a  
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 ) 5x856RQ'  
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。 HY-7{irR~  
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, B_R J;.oH  
g. 点击OK 9 Rl-Jz8g  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 [rk*4b^s  
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脚本代码 cj K\(b3  
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'#Language "WWB-COM" DwSB(O#X  
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Option Explicit &! i'Q;q  
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Sub Main vd<r}3i*  
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    'Cleanup Qp>'V<%m-  
    ClearOutputWindow() <14,xYpE  
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    Print "Merging RPC Photonics BSDF Data Files" ~-2%^ovB  
    SetTextColor(255,0,0)  -c%#Hd  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." a(.q=W  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 0\tV@ 6p2=  
    SetTextColor(0,0,0) m q#8 [D  
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    'Current directory of this script (should be the same as the text files being merged) xXb7/.*qE  
    Dim cDir As String WO;2=[#O;  
    cDir = MacroDir$ & "\" ^.3(o{g  
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    'Array which will be populated with the list of files to be merged Nm {|  
    Dim fList() As String, curFile As String iA.:{^_)09  
    GetFileList( cDir, fList ) OVq(ulwi+  
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    Print "" e^!>W %.7Z  
    Print "Files found for merging:" D[jPz0  
    For Each curFile In fList ,:[\h\5m  
        Print Chr(9) & curFile UP<B>Y1a  
    Next Rtywi}VV2  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. DP@F-Q4  
    Dim nameArray() As String, sampName As String r+%$0eB1^  
    nameArray = Split(fList(0)," 0-0.txt") y@XE! L  
    sampName  = nameArray(0) gh9Gc1tKt  
    Print "" k2-+3zx  
    Print "Sample name: " & Chr(9) & sampName 3A&: c/  
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    'Open an output file and write the FRED header data N1D{ %  
    Dim outFile As String m>FP&~2  
    outFile = cDir & sampName & "_FRED.txt" iQd,xr  
    Open outFile For Output As #1 F ?N+ __o  
    Print #1, "type bsdf_data" kR0/jEz C  
    Print #1, "format angles=deg bsdf=value scale=1" =|+%^)E  
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    'Loop the file list, skip the two header lines and write the remaining data to file S7B\m v  
    Dim lineArray() As String, curLine As Long $G<!+^T  
    For Each curFile In fList `8 Ann~Z|k  
        Print "Merging data from file " & curFile L l$,"}0T  
        ReadFile( cDir & curFile, lineArray ) YMG~k3Yb  
        For curLine = 2 To UBound(lineArray) e6`g[Ap  
            Print #1, lineArray(curLine) MSqW {  
        Next E !EENg  
    Next d DrzO*a\  
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    'Close the output file Hb&C;lk  
    Close #1 :pJK Z2B,  
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    Print "Finished merging RPC data for sample " & sampName ]mR!-Fqj  
    Print "FRED formatted data file: " & Chr(9) & outFile 0n/+X[%Ti  
End Sub 1xTNrLW  
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'Utility function to read the contents of a file into an array of strings. cj;k{ Moc  
Function ReadFile(ByVal fileName As String, _ ()MUyW"S#`  
                  ByRef lineArray() As String) As Long 0/5{v6_rG  
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    ReadFile = -1 d-{1>\-_  
    Dim oFSO As Object GMKY1{   
    Set oFSO = CreateObject("Scripting.FileSystemObject") U[O7}Nsb"  
    Erase lineArray C2;Hugm4  
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    Dim fid As Long _{2/QP}  
    If oFSO.fileexists( fileName ) Then &gdhq~4#  
        fid = FreeFile() 4+B&/}FDLo  
        Open fileName For Input As fid { Ba_.]x  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) RI2/hrW  
        Close fid O77^.B  
    End If 1|WrJ-Uf  
    Set oFSO = Nothing !g[UFw  
    Return UBound( lineArray ) TCI)L}L|  
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End Function +JejnG0  
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Sub GetFileList( ByVal in_dir As String, _ ^wlo;.8Y  
                 ByRef in_flist() As String ) jaL#  
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    'Redimension the file list array _ SJ Fuv/  
    Erase in_flist 0bfJD'^9RP  
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    'Tracks how many files are found KY+BXGW*  
    Dim fCount As Long \C kb:  
    fCount = 0 G%MdZg&i  
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    'Recurse directory and search for text files 19;Pjo8  
    Dim f As String 6KE?@3;Om  
    f = Dir$(in_dir & "*.txt") !BDJU  
    While f <> "" =X3Rk)2r  
        ReDim Preserve in_flist(fCount) ~o27~R ]  
        in_flist(fCount) = f B-oQjr-  
        fCount += 1 o(stXa  
        f = Dir$() :yFmCLZaQ  
    Wend D+xPd<  
    ReDim Preserve in_flist(fCount-1)

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