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infotek 2020-12-15 09:37

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 mn?< Zz  
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。 G;qC& 7T  
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。 rM<c;iQ  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 \zR{D}aS  
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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。 <IGnWAWn  
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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) ShxB!/s  
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 =sPY+~<o  
例如下所示: Wb68")$  
Sample name:  EDF-C1-56 QROe+:  
Merging data from file EDF-C1-56 0-0.txt Txj%o5G  
Finished merging RPC data for sample EDF-C1-56 O (<Wn-  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt b`PAOQ  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 P'KaWu9z  
a. 创建一个新的散射库 88$G14aXEk  
b. 散射模型命名 Gyw@+(l  
c. 改变散射模型为“Tabulated BSDF”. n1a;vE{!  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 2d>kc2=*  
e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 [kMXr'TyPX  
f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线,  ^GB9!d.  
g. 点击OK sF C&DTb?  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 \RnGKQ"4  
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脚本代码 5- 0  
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'#Language "WWB-COM" =4/LixsV|  
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Option Explicit G0^WQQ4  
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Sub Main G9<p Yt{:  
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    'Cleanup `^-?yu@  
    ClearOutputWindow() [#fXmW>N/  
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    Print "Merging RPC Photonics BSDF Data Files" ^VR1whCrx  
    SetTextColor(255,0,0) ]0GOSh  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." f\!*%xS;  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 57'=Qz52  
    SetTextColor(0,0,0) #r `hK)  
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    'Current directory of this script (should be the same as the text files being merged) ~Us1F=i_Q  
    Dim cDir As String if9I7@  
    cDir = MacroDir$ & "\" 9t(B{S  
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    'Array which will be populated with the list of files to be merged KFor~A# D  
    Dim fList() As String, curFile As String D9B?9Qt2[  
    GetFileList( cDir, fList ) [R)?93  
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    Print "" Z~F% K~(  
    Print "Files found for merging:" y%Ui)UMnw]  
    For Each curFile In fList NIrK+uC.d  
        Print Chr(9) & curFile .^N+'g  
    Next s[)2z3  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. W@GcE;#-  
    Dim nameArray() As String, sampName As String v)N8vFdd  
    nameArray = Split(fList(0)," 0-0.txt") [ -bL>8  
    sampName  = nameArray(0) 6*Qn9Q%p-  
    Print "" X&0m$x  
    Print "Sample name: " & Chr(9) & sampName 6cp x1y]~6  
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    'Open an output file and write the FRED header data pMM-LY7%{  
    Dim outFile As String H6 ( ~6Bp5  
    outFile = cDir & sampName & "_FRED.txt" '\H{Y[  
    Open outFile For Output As #1 ?u` ?_us  
    Print #1, "type bsdf_data" j)Zi4<./  
    Print #1, "format angles=deg bsdf=value scale=1" P1]ucu_y,  
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    'Loop the file list, skip the two header lines and write the remaining data to file jb$sIZ%i  
    Dim lineArray() As String, curLine As Long t(VG#}  
    For Each curFile In fList >Y?B(I2e  
        Print "Merging data from file " & curFile 3!`Pv ?|o  
        ReadFile( cDir & curFile, lineArray ) ptQr8[FA  
        For curLine = 2 To UBound(lineArray) 8K*X]Z h  
            Print #1, lineArray(curLine) 3Zs|arde2  
        Next 4JKB6~Y  
    Next {g@Wd2-J}  
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    'Close the output file =H.l/'/Z  
    Close #1 d{0b*l%  
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    Print "Finished merging RPC data for sample " & sampName J4 .C"v0a  
    Print "FRED formatted data file: " & Chr(9) & outFile }OJ*o  
End Sub aj51%wKMb:  
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'Utility function to read the contents of a file into an array of strings. 9G` 2t~%  
Function ReadFile(ByVal fileName As String, _ E^zgYkZO  
                  ByRef lineArray() As String) As Long ,RKBGOz?f  
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    ReadFile = -1 K~z*P 0g*  
    Dim oFSO As Object 9*GwW&M%1_  
    Set oFSO = CreateObject("Scripting.FileSystemObject") I: U/%cr,  
    Erase lineArray HAEgR  
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    Dim fid As Long 8jd<|nYnfc  
    If oFSO.fileexists( fileName ) Then U2 <*BRJ  
        fid = FreeFile() ,w; ~R4x  
        Open fileName For Input As fid A@bWlwfl  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) i:Pg&474f  
        Close fid h>sz@\{  
    End If I.r &;   
    Set oFSO = Nothing  ^ 'FC.  
    Return UBound( lineArray ) GRCc<TM, U  
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End Function SKuZik_  
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Sub GetFileList( ByVal in_dir As String, _ {S%)GvrT  
                 ByRef in_flist() As String ) o+;=C@,'  
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    'Redimension the file list array /D`M?nD7  
    Erase in_flist Ev0GAc1  
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    'Tracks how many files are found M$ep.<Z1|  
    Dim fCount As Long :^0g}8$<  
    fCount = 0 -}%'I ]R=  
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    'Recurse directory and search for text files IJ!]1fXy+  
    Dim f As String &JAQ:([:  
    f = Dir$(in_dir & "*.txt") ehtiu!Vk  
    While f <> "" )b m|],'  
        ReDim Preserve in_flist(fCount) auAST;"Z8  
        in_flist(fCount) = f Ky|Hi3?  
        fCount += 1 uEWWY t  
        f = Dir$() }r]WB)_w  
    Wend 8R`@edj>  
    ReDim Preserve in_flist(fCount-1) Z{+h~?63  
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End Sub l~Kn-S{  
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