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infotek 2020-12-15 09:37

RPC Photonics扩散片BSDF

摘要 %[m1\h"1  
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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 q.{/{9  
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。 #)}bUNc'  
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。 ] Nipo'N;  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 o{W]mr3D  
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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。 :=v{inN  
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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) de{YgN  
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 pY#EXZ#   
例如下所示: 2_b'mepV  
Sample name:  EDF-C1-56 ^oO5t-9<!  
Merging data from file EDF-C1-56 0-0.txt ){6)?[G  
Finished merging RPC data for sample EDF-C1-56 8w?\_P7QA  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt IF}c*uGj}  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 wN hR(M7  
a. 创建一个新的散射库 0(9@GIT  
b. 散射模型命名 ]GKx[F{)  
c. 改变散射模型为“Tabulated BSDF”. ~c$ts&Cl  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 4,ynt&  
e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 `h5eej&s(  
f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, ~U6YN_W  
g. 点击OK Er1u1@  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ! H=k7s  
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脚本代码 f,inQ2f}d  
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'#Language "WWB-COM" G2{M#H  
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Option Explicit T&"dBoUq>G  
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Sub Main `R52{B#&/  
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    'Cleanup Rue|<d1  
    ClearOutputWindow() 1za'u_  
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    Print "Merging RPC Photonics BSDF Data Files" ]N <]  
    SetTextColor(255,0,0) 1(7.V-(G  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 7r[ %| :  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." PeUd  
    SetTextColor(0,0,0) V0 +k3H  
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    'Current directory of this script (should be the same as the text files being merged) Dq%r !)  
    Dim cDir As String :`u&TXsu  
    cDir = MacroDir$ & "\" }-q`&1!t  
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    'Array which will be populated with the list of files to be merged 0Q- Mxcj  
    Dim fList() As String, curFile As String /.kna4k  
    GetFileList( cDir, fList ) p@7i=hyt`p  
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    Print "" }vUlTH  
    Print "Files found for merging:" ^8oc^LOa~2  
    For Each curFile In fList bqQO E4;  
        Print Chr(9) & curFile >6l;/J  
    Next JQ/t, v$G  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. m$E^u[  
    Dim nameArray() As String, sampName As String *iRm`)zC(  
    nameArray = Split(fList(0)," 0-0.txt") PVD ~W)0m*  
    sampName  = nameArray(0) L_lDFF  
    Print "" <[y$D=n  
    Print "Sample name: " & Chr(9) & sampName x !:9c<  
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    'Open an output file and write the FRED header data Ng'ZAG;O  
    Dim outFile As String [cQ<dVaTX  
    outFile = cDir & sampName & "_FRED.txt" ',H$zA?i  
    Open outFile For Output As #1 5h|m4)$  
    Print #1, "type bsdf_data" ( ztim  
    Print #1, "format angles=deg bsdf=value scale=1" L;--d`[  
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    'Loop the file list, skip the two header lines and write the remaining data to file 4Ay`rG  
    Dim lineArray() As String, curLine As Long 6_%]\37_Z  
    For Each curFile In fList u3*NO )O  
        Print "Merging data from file " & curFile txml*/zL  
        ReadFile( cDir & curFile, lineArray ) Y1fy2\<'  
        For curLine = 2 To UBound(lineArray) JIP+ !2  
            Print #1, lineArray(curLine) j FPU zB"  
        Next x!C8?K =|  
    Next 6@?aVM~  
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    'Close the output file Y%fVt|  
    Close #1 p]h*6nH>~  
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    Print "Finished merging RPC data for sample " & sampName 0;FqX*  
    Print "FRED formatted data file: " & Chr(9) & outFile < g3du~  
End Sub &SjHrOG?  
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'Utility function to read the contents of a file into an array of strings. 0i5y(m&7  
Function ReadFile(ByVal fileName As String, _ so!w!O@@  
                  ByRef lineArray() As String) As Long 5?5- ;H  
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    ReadFile = -1 p<=(GY-  
    Dim oFSO As Object hgweNRTh!  
    Set oFSO = CreateObject("Scripting.FileSystemObject") ceb s.sF:  
    Erase lineArray *2,e=tY>  
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    Dim fid As Long Sa;<B:|  
    If oFSO.fileexists( fileName ) Then 11)/] ?/j  
        fid = FreeFile() $hjP}- oUX  
        Open fileName For Input As fid Lj&1K~U  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) SZ5O89  
        Close fid GJ1;\:cQq  
    End If RgB6:f,  
    Set oFSO = Nothing K\{b!Cfr^  
    Return UBound( lineArray ) pg~zUOY  
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End Function Q_&}^  
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Sub GetFileList( ByVal in_dir As String, _ ]d@^i)2LF  
                 ByRef in_flist() As String ) qQfqlD<  
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    'Redimension the file list array 4S,.R  
    Erase in_flist @+'c+  
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    'Tracks how many files are found q>_vE{UB  
    Dim fCount As Long .:}.b"%m  
    fCount = 0 1)TK01R8  
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    'Recurse directory and search for text files :tRf@bD#  
    Dim f As String tg.|$n  
    f = Dir$(in_dir & "*.txt") ^FP} qW~;9  
    While f <> "" r<;l{7lY_  
        ReDim Preserve in_flist(fCount) QS3U)ZO$@  
        in_flist(fCount) = f }.0Bl&\UK  
        fCount += 1 .6>  hD1'  
        f = Dir$() [Q4_WKI0T  
    Wend Jy \2I{I'  
    ReDim Preserve in_flist(fCount-1) wL4Z W8_  
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End Sub duX0Mc. 0P  
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