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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 %a_ rYrL  
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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。 j>{Dbl:#2  
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背景 _XO3ml\x@  
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。 _{]\} =@  
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 6cF~8  
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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。 bc?\lD$ $  
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) hnk,U:7}  
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 4P406,T]r  
例如下所示: V>$A\AWw  
Sample name:  EDF-C1-56 /e2CB"c   
Merging data from file EDF-C1-56 0-0.txt vDeb?n  
Finished merging RPC data for sample EDF-C1-56 MsaD@JY.y  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt fAMk<?  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面
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a. 创建一个新的散射库 _|'e Az   
b. 散射模型命名 8(6(,WwP}  
c. 改变散射模型为“Tabulated BSDF”. B"@3Qav3  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) )g()b"Z #>  
e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 Yq$KYB j  
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, isG8S(}IW&  
g. 点击OK ]#7{ x  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 !T'`L{Sj  
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脚本代码 D?Mj<||  
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'#Language "WWB-COM" 17 k9h?s*  
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Option Explicit 2`Ojw_$W7  
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Sub Main 1(q &(p  
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    'Cleanup @(m+B\  
    ClearOutputWindow() `X:o]t@  
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    Print "Merging RPC Photonics BSDF Data Files" $+P6R`K  
    SetTextColor(255,0,0) (uxe<'Co|  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ]gw[ ~  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." At0ahy+  
    SetTextColor(0,0,0) \[>Ob  
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    'Current directory of this script (should be the same as the text files being merged) -lb,0   
    Dim cDir As String \~r`2p-K  
    cDir = MacroDir$ & "\" mw\ z'  
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    'Array which will be populated with the list of files to be merged L/[b~D>T%  
    Dim fList() As String, curFile As String YUGEGXw  
    GetFileList( cDir, fList ) Sb/`a~q ^  
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    Print "" =^9I)JW  
    Print "Files found for merging:" js$L<^7  
    For Each curFile In fList ~OE1Sd:2  
        Print Chr(9) & curFile S.I3m-  
    Next -PG81F&K  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement.  Fhk 8  
    Dim nameArray() As String, sampName As String VqIzDs  
    nameArray = Split(fList(0)," 0-0.txt") \C&[BQ\  
    sampName  = nameArray(0) UG!528;7  
    Print "" 7eR%zNDa  
    Print "Sample name: " & Chr(9) & sampName eXYf"hU,  
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    'Open an output file and write the FRED header data !lnRl8oV  
    Dim outFile As String vg"$&YX9"  
    outFile = cDir & sampName & "_FRED.txt" -r'/PbV0  
    Open outFile For Output As #1 z{q|HO  
    Print #1, "type bsdf_data" Fmd^9K  
    Print #1, "format angles=deg bsdf=value scale=1" 4pJ #fkc^  
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    'Loop the file list, skip the two header lines and write the remaining data to file [wO|P{8\"  
    Dim lineArray() As String, curLine As Long Bw{enf$vR  
    For Each curFile In fList YjR`}rdwo  
        Print "Merging data from file " & curFile 6z'3e\x  
        ReadFile( cDir & curFile, lineArray ) :,@\q0j"=  
        For curLine = 2 To UBound(lineArray) c{,VU.5/  
            Print #1, lineArray(curLine) Po1/_# mu  
        Next eJvNUBDSH  
    Next %`# HGji)  
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    'Close the output file '| 6ZPv&N  
    Close #1 d$gT,+|vu  
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    Print "Finished merging RPC data for sample " & sampName (X3}&aLF  
    Print "FRED formatted data file: " & Chr(9) & outFile F*, e,s  
End Sub L>>RboR}  
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'Utility function to read the contents of a file into an array of strings. O!U8"Yr$  
Function ReadFile(ByVal fileName As String, _ e a3f`z  
                  ByRef lineArray() As String) As Long *I6W6y;E=  
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    ReadFile = -1 t8?$q})RL  
    Dim oFSO As Object A0l-H/l7  
    Set oFSO = CreateObject("Scripting.FileSystemObject") q(9S4F   
    Erase lineArray Q&@e,7]V+  
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    Dim fid As Long ?lPyapA]  
    If oFSO.fileexists( fileName ) Then B'D\l\w  
        fid = FreeFile() _wp_y-"  
        Open fileName For Input As fid @km@\w  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) +}eH,  
        Close fid &~K4I  
    End If NW4tQ;ad  
    Set oFSO = Nothing %E k!3t  
    Return UBound( lineArray ) =MjkD)l  
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End Function *Tum(wWZ  
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Sub GetFileList( ByVal in_dir As String, _ o FS2*u  
                 ByRef in_flist() As String ) nXT/zfS  
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    'Redimension the file list array eq6>C7.$  
    Erase in_flist E'cI}q  
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    'Tracks how many files are found A:4?Jd>  
    Dim fCount As Long 0CpE,gg  
    fCount = 0 k~XDwmt;  
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    'Recurse directory and search for text files '',g}WvRwe  
    Dim f As String EpCF/i?9:  
    f = Dir$(in_dir & "*.txt") 3]li3B'  
    While f <> "" eqSCE6r9x  
        ReDim Preserve in_flist(fCount) HJ+ Q7)  
        in_flist(fCount) = f ;wa#m1  
        fCount += 1 CxD=8X9m  
        f = Dir$() H{4_,2h =m  
    Wend ;Xl {m`E+  
    ReDim Preserve in_flist(fCount-1)

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