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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 w;z7vN~/O  
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。 f7Gn$E|/r;  
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。 p/.8})c1r  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 x:Y9z_)O  
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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。 d#k(>+%=Q  
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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) -@orIwA&  
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 8>Cr6m   
例如下所示: zWHq4@K  
Sample name:  EDF-C1-56 R>< g\{G]  
Merging data from file EDF-C1-56 0-0.txt k3~9;Z  
Finished merging RPC data for sample EDF-C1-56 2hh8G5IaQ  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 8bIP"!=*W  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 {o=?@$6C  
a. 创建一个新的散射库 iI3:<j l  
b. 散射模型命名 18X@0e  
c. 改变散射模型为“Tabulated BSDF”. 5/meH[R\M  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ]%Q!%uTh  
e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 TT$A 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, _plK(g-1J%  
g. 点击OK ll:UIxx  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 0RUk^  
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脚本代码 K_7pr~D]@r  
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'#Language "WWB-COM" gP^2GnjHL8  
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Option Explicit .Y)[c. ,j  
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Sub Main aSL`yuXu  
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    'Cleanup N8<J'7%  
    ClearOutputWindow() PwY/VGT  
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    Print "Merging RPC Photonics BSDF Data Files" {SoI;o_>  
    SetTextColor(255,0,0) h$cm:uks  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ua\t5M5  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." S-Uod y  
    SetTextColor(0,0,0) eA!o#O.  
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    'Current directory of this script (should be the same as the text files being merged) .sMs_ 5D  
    Dim cDir As String Z\&f"z?L  
    cDir = MacroDir$ & "\" Nw;qJ58@  
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    'Array which will be populated with the list of files to be merged C2 N+X(  
    Dim fList() As String, curFile As String rK3kg2H  
    GetFileList( cDir, fList ) PEMkx"h +  
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    Print "" uuzV,q  
    Print "Files found for merging:"   f XD+  
    For Each curFile In fList Q*ITs!~Z  
        Print Chr(9) & curFile =c8}^3L~7  
    Next  q+P@2FL  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. d {z[46>  
    Dim nameArray() As String, sampName As String j=\h|^gA  
    nameArray = Split(fList(0)," 0-0.txt") mHD_cgKN  
    sampName  = nameArray(0) %X}ZX|{O  
    Print "" $d?+\r:I{,  
    Print "Sample name: " & Chr(9) & sampName G0FzXtu)q  
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    'Open an output file and write the FRED header data %sa?/pjK  
    Dim outFile As String [KDxB>R<{  
    outFile = cDir & sampName & "_FRED.txt" BN/ 4O?jD9  
    Open outFile For Output As #1 ;vn0%g  
    Print #1, "type bsdf_data"  W!Tx%  
    Print #1, "format angles=deg bsdf=value scale=1" Gnc`CyN:H  
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    'Loop the file list, skip the two header lines and write the remaining data to file STKL  
    Dim lineArray() As String, curLine As Long Zxk~X}K\P  
    For Each curFile In fList 4GYi'  
        Print "Merging data from file " & curFile 0<M-asI?  
        ReadFile( cDir & curFile, lineArray ) %nA})nA7=  
        For curLine = 2 To UBound(lineArray) r]B8\5|<d  
            Print #1, lineArray(curLine) D9rQ%|}S  
        Next h~dQ5%  
    Next (d9~z  
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    'Close the output file }{0}$#z u  
    Close #1 o3WOp80hz  
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    Print "Finished merging RPC data for sample " & sampName >XN[KPTa  
    Print "FRED formatted data file: " & Chr(9) & outFile dQ:,pe7A  
End Sub dSI"yz  
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'Utility function to read the contents of a file into an array of strings. Dy08.Sss  
Function ReadFile(ByVal fileName As String, _ -t-f&`S||  
                  ByRef lineArray() As String) As Long *v<f#hB"  
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    ReadFile = -1 4jT6h9%  
    Dim oFSO As Object a@}.96lStD  
    Set oFSO = CreateObject("Scripting.FileSystemObject") ew;;e|24  
    Erase lineArray s 6Wp"V(  
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    Dim fid As Long jkeerU6  
    If oFSO.fileexists( fileName ) Then i4D(8;  
        fid = FreeFile() %G?@Hye3  
        Open fileName For Input As fid j?T'N:Qd  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) f-U zFlU  
        Close fid K)SWM3r  
    End If I| TNo-!$  
    Set oFSO = Nothing +IZ=E >a  
    Return UBound( lineArray ) q~`hn(S  
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End Function Ae5A@4  
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Sub GetFileList( ByVal in_dir As String, _ 44CZl{pt  
                 ByRef in_flist() As String ) ?<Qbp;WBo  
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    'Redimension the file list array fe .=Z&  
    Erase in_flist `$a!CJu,  
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    'Tracks how many files are found QE 4   
    Dim fCount As Long 0nc(2Bi  
    fCount = 0 18$d-[hX  
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    'Recurse directory and search for text files *F$@!ByV  
    Dim f As String i0M6;W1T  
    f = Dir$(in_dir & "*.txt") =7!s8D,[  
    While f <> "" =OufafZb  
        ReDim Preserve in_flist(fCount) SQMl5d1d:  
        in_flist(fCount) = f *%uzLW0  
        fCount += 1 HDm]njF%qQ  
        f = Dir$() ._+cvXy  
    Wend \g0vzo"u  
    ReDim Preserve in_flist(fCount-1) Y S3~sA  
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End Sub v^A+LZ*d  
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