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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 e=;AfK  
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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。 =xJKIu  
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背景 L^4-5`gj  
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。 i'wAE:Xe  
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 a di [-L#  
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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。 FH%GIi  
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) \Z/)Y;|mi0  
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 { e5/+W  
例如下所示: ,qrQ"r9  
Sample name:  EDF-C1-56 9Xo[(h)5d  
Merging data from file EDF-C1-56 0-0.txt *[R eb %  
Finished merging RPC data for sample EDF-C1-56 ^ Dt#$Z  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt qTo-pA G`  
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 yxq}QSb \3  
b. 散射模型命名 3y~r72J  
c. 改变散射模型为“Tabulated BSDF”. Iu *^xn  
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 ) m&iH2|  
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。 gxMfu?zk"  
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, dN}#2Bo =  
g. 点击OK hyT1xa  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 9bq<GC'eX8  
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脚本代码 ~w;]c_{.b  
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'#Language "WWB-COM" _:B1_rz7,  
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Option Explicit vuFBET,  
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Sub Main AVU>+[.=%c  
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    'Cleanup N9<Ujom  
    ClearOutputWindow() [ dE.[  
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    Print "Merging RPC Photonics BSDF Data Files" ?}Lg)EFH  
    SetTextColor(255,0,0) GzTq5uU&  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." M}wXJ8aF?  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." $CE[MZ&S  
    SetTextColor(0,0,0) `K >?ju"  
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    'Current directory of this script (should be the same as the text files being merged) *VkgQ`c  
    Dim cDir As String 7RvUH-S[  
    cDir = MacroDir$ & "\" 6Ik,zQL  
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    'Array which will be populated with the list of files to be merged mG1 IQ!  
    Dim fList() As String, curFile As String @v*/R%rv t  
    GetFileList( cDir, fList ) (?b@b[D~4  
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    Print "" `ZaT}# Y  
    Print "Files found for merging:" xT)psM'CL  
    For Each curFile In fList 1lnU77;  
        Print Chr(9) & curFile WWZ9._  
    Next V8~jf-\$b  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Jj^GWZRu  
    Dim nameArray() As String, sampName As String !"TZ:"VZU  
    nameArray = Split(fList(0)," 0-0.txt") 9Of FM9(:  
    sampName  = nameArray(0) X+n`qiwq  
    Print "" V=:_d,  
    Print "Sample name: " & Chr(9) & sampName NS,5/t  
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    'Open an output file and write the FRED header data M'1!<a-Mp  
    Dim outFile As String 4E:bp   
    outFile = cDir & sampName & "_FRED.txt" b( ^^m:(w  
    Open outFile For Output As #1 +tN &a  
    Print #1, "type bsdf_data" e[t<<u3"  
    Print #1, "format angles=deg bsdf=value scale=1" VRW] a  
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    'Loop the file list, skip the two header lines and write the remaining data to file ,A5)<}  
    Dim lineArray() As String, curLine As Long !z zW2>  
    For Each curFile In fList s/1 #DM"  
        Print "Merging data from file " & curFile =qvZpB7ZZ  
        ReadFile( cDir & curFile, lineArray ) qOG}[%<^n7  
        For curLine = 2 To UBound(lineArray) V8z`qEPM  
            Print #1, lineArray(curLine) ;#G%U!p  
        Next :<~7y.*O{  
    Next *xM/ ;)  
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    'Close the output file qsg>5E  
    Close #1 )-/gLZsx  
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    Print "Finished merging RPC data for sample " & sampName $'[q4wo<  
    Print "FRED formatted data file: " & Chr(9) & outFile y02 u?wJ  
End Sub 5GAy "Xd  
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'Utility function to read the contents of a file into an array of strings. w9#R'  
Function ReadFile(ByVal fileName As String, _ u:` y]  
                  ByRef lineArray() As String) As Long \T-~JQVj  
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    ReadFile = -1 S9Yt1qb  
    Dim oFSO As Object px9>:t[P  
    Set oFSO = CreateObject("Scripting.FileSystemObject") f3 ]  
    Erase lineArray Z]-WFU_ N  
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    Dim fid As Long +EASAq  
    If oFSO.fileexists( fileName ) Then 04 y!\  
        fid = FreeFile() RFG$X-.e  
        Open fileName For Input As fid w&lZ42(mF  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) e4qj .b  
        Close fid \-. Tg!Q6  
    End If BEw{X|7  
    Set oFSO = Nothing Wtv#h~jy9  
    Return UBound( lineArray ) Y~"9L|`f/  
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End Function S>ugRasZ$  
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Sub GetFileList( ByVal in_dir As String, _ IF?xnu  
                 ByRef in_flist() As String ) h}=M^SL  
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    'Redimension the file list array Gidkt;lj  
    Erase in_flist nN ~GP"}  
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    'Tracks how many files are found & QY#3yj=  
    Dim fCount As Long c)1=U_61  
    fCount = 0 H,>#|F  
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    'Recurse directory and search for text files 3B,QJ&  
    Dim f As String J`Oy.Qu)  
    f = Dir$(in_dir & "*.txt") A'DVJ9%xB  
    While f <> "" s[-]cHQ  
        ReDim Preserve in_flist(fCount) ]M4NpU M  
        in_flist(fCount) = f R[ yL _>  
        fCount += 1 [(c L/_  
        f = Dir$() iUNnPJh  
    Wend 5L &:_iQZy  
    ReDim Preserve in_flist(fCount-1)

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