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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 ZHa"isl$e  
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RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 .mR8q+I6  
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背景 YOcO4   
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 a |X a3E  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 W)bLSL]`E  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 7<*yS310  
图2. RPC Photonics工程漫射体不同类型的散射数据
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) K|epPGRr  
3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 `x*Pof!Io  
例如下所示: Fe4(4  
Sample name:  EDF-C1-56 5?x>9C a  
Merging data from file EDF-C1-56 0-0.txt Qnsi`1mASr  
Finished merging RPC data for sample EDF-C1-56 [1S|dc>.O%  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt %$.3V#?  
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 lN Yt`xp  
b. 散射模型命名 )?anOD[  
c. 改变散射模型为“Tabulated BSDF”. ;>Ib^ov  
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 ) ZpQ)IHA.  
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。 2fL;-\!y(  
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, glDu2a,Q  
g. 点击OK T{-CkHf9Q  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 bE !GJZ  
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脚本代码 |IzPgC  
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'#Language "WWB-COM" .(cw>7e3D  
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Option Explicit b0Ps5G\ u  
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Sub Main uxr #QA  
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    'Cleanup V2wb%;q  
    ClearOutputWindow() iP7(tnlW$  
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    Print "Merging RPC Photonics BSDF Data Files" "ut39si  
    SetTextColor(255,0,0) )"7iJb<E  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ~qTx|",  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." *XIF)Q=<>  
    SetTextColor(0,0,0) -lY6|79bF  
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    'Current directory of this script (should be the same as the text files being merged) vdc\R?  
    Dim cDir As String . 1Dg s=|  
    cDir = MacroDir$ & "\" Q+{xZ'o"Z  
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    'Array which will be populated with the list of files to be merged _@ qjV~%Sy  
    Dim fList() As String, curFile As String OrY/`+Cog  
    GetFileList( cDir, fList ) 52Z2]T c ,  
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    Print "" nFHUy9q  
    Print "Files found for merging:" :(P9mt  
    For Each curFile In fList ,is3&9  
        Print Chr(9) & curFile 6d<r= C=  
    Next qN9(S:_Px  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. (c=6yV@  
    Dim nameArray() As String, sampName As String 1#< '&Lr  
    nameArray = Split(fList(0)," 0-0.txt") Nk? ^1n$  
    sampName  = nameArray(0) $ r@zs'N  
    Print "" iL-(O;n  
    Print "Sample name: " & Chr(9) & sampName *&^Pj%DX  
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    'Open an output file and write the FRED header data BYL)nCc  
    Dim outFile As String ,~N/- 5  
    outFile = cDir & sampName & "_FRED.txt" On9A U:\  
    Open outFile For Output As #1 FpmM63$VN[  
    Print #1, "type bsdf_data" k8&;lgO '  
    Print #1, "format angles=deg bsdf=value scale=1" +>6iYUa  
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    'Loop the file list, skip the two header lines and write the remaining data to file un mJbY;t  
    Dim lineArray() As String, curLine As Long 6 $4[gcL'  
    For Each curFile In fList '}53f2%gKa  
        Print "Merging data from file " & curFile 'uS n}hm  
        ReadFile( cDir & curFile, lineArray ) -A^_{4X  
        For curLine = 2 To UBound(lineArray) c<B/V0]  
            Print #1, lineArray(curLine)  dVtG/0  
        Next ] vHF~|/-  
    Next /$Nsd  
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    'Close the output file AUG#_HE]k  
    Close #1 [.7d<oY  
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    Print "Finished merging RPC data for sample " & sampName ^1I19q  
    Print "FRED formatted data file: " & Chr(9) & outFile  ?Jm^<  
End Sub Cgk<pky1  
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'Utility function to read the contents of a file into an array of strings. &AeX   
Function ReadFile(ByVal fileName As String, _ t%0VJB,Q2  
                  ByRef lineArray() As String) As Long BO?%'\  
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    ReadFile = -1 KxJ!,F{>H  
    Dim oFSO As Object o q Xg  
    Set oFSO = CreateObject("Scripting.FileSystemObject") XJ;57n-?  
    Erase lineArray G5BfNU  
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    Dim fid As Long yLvDMPj  
    If oFSO.fileexists( fileName ) Then jp%S3)  
        fid = FreeFile() ;WQve_\  
        Open fileName For Input As fid 2`K=Hby  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) I{ C SH  
        Close fid BA:VPTZq  
    End If SwGx?U  
    Set oFSO = Nothing Z"xvh81P  
    Return UBound( lineArray ) I^-Sb=j?Z  
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End Function rH Lm\3  
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Sub GetFileList( ByVal in_dir As String, _ rpha!h>w1%  
                 ByRef in_flist() As String ) Gx/Oi)&/  
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    'Redimension the file list array 9s q  
    Erase in_flist dFB]~QEK  
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    'Tracks how many files are found L~OvY  
    Dim fCount As Long m=:9+z  
    fCount = 0 +{.WQA}z\  
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    'Recurse directory and search for text files e#8Q L  
    Dim f As String zR:L! S  
    f = Dir$(in_dir & "*.txt") ITI)soa~  
    While f <> "" rglXs  
        ReDim Preserve in_flist(fCount) .uZ3odMlx  
        in_flist(fCount) = f }o(-=lF  
        fCount += 1 mO7]9 p  
        f = Dir$() *w\W/Y  
    Wend <iC(`J$D  
    ReDim Preserve in_flist(fCount-1)

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