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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 O_7|C\]  
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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。 Why`ziks  
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背景 hRhe& ,v  
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?=<Riu  
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 oap4rHk}  
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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。 %>{0yEC  
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) @Jw-8Q{  
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 (O3nL.  
例如下所示: %* }(}~  
Sample name:  EDF-C1-56 EaN6^S=  
Merging data from file EDF-C1-56 0-0.txt /PIcqg  
Finished merging RPC data for sample EDF-C1-56 4H&+dR I"  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ?6WY:Zec@  
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 L4nYXW0y  
b. 散射模型命名 T_4/C2  
c. 改变散射模型为“Tabulated BSDF”. |CRn c:  
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,DeHJjAlE  
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。 ]}Yl7/gM1}  
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, X'iWJ8  
g. 点击OK /7YIn3  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 KbeC"mi  
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脚本代码 }qD\0+`qi  
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'#Language "WWB-COM" ]h5tgi?_l  
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Option Explicit 9G2FsM|,  
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Sub Main jmZI7?<z  
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    'Cleanup =T7.~W  
    ClearOutputWindow() uwGc@xOgg,  
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    Print "Merging RPC Photonics BSDF Data Files" GZIa 4A  
    SetTextColor(255,0,0) X"%gQ.1|{j  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 4j^ @wV'  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." Xsa].  
    SetTextColor(0,0,0) Ig{0Z">  
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    'Current directory of this script (should be the same as the text files being merged) G18b$z  
    Dim cDir As String c7H^$_^=  
    cDir = MacroDir$ & "\" U]rRQ d/:;  
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    'Array which will be populated with the list of files to be merged !j-Z Lq:;  
    Dim fList() As String, curFile As String wUJcmM;  
    GetFileList( cDir, fList ) pd$[8Rmj_  
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    Print "" xyXa .  
    Print "Files found for merging:" x kD6Iw  
    For Each curFile In fList I7 ]8Y=xf  
        Print Chr(9) & curFile gs`q6 f%(  
    Next .T`%tJ-Em  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. -mh3DhJ,  
    Dim nameArray() As String, sampName As String g<qaXv  
    nameArray = Split(fList(0)," 0-0.txt") {_*yGK48n  
    sampName  = nameArray(0) E"IZ6)Q  
    Print "" ~"A0Rs=  
    Print "Sample name: " & Chr(9) & sampName .e-#yET  
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    'Open an output file and write the FRED header data yB!dp;gM{  
    Dim outFile As String |w3M7;~eF  
    outFile = cDir & sampName & "_FRED.txt" m]&SNz=  
    Open outFile For Output As #1 3XNCAb2  
    Print #1, "type bsdf_data" N2o7%gJw  
    Print #1, "format angles=deg bsdf=value scale=1" /$%%s=@IL  
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    'Loop the file list, skip the two header lines and write the remaining data to file e|r`/:M  
    Dim lineArray() As String, curLine As Long }6ldjCT/,  
    For Each curFile In fList %"-5 <6d  
        Print "Merging data from file " & curFile NHE18_v5  
        ReadFile( cDir & curFile, lineArray ) G#$-1"!`  
        For curLine = 2 To UBound(lineArray) J .<F"r>  
            Print #1, lineArray(curLine) Iga0 24KR  
        Next vih9 KBT  
    Next 4^d?D!j  
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    'Close the output file 2~2 O V  
    Close #1 /mZE/>&~ ,  
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    Print "Finished merging RPC data for sample " & sampName =EsavN  
    Print "FRED formatted data file: " & Chr(9) & outFile xyxy`qRA  
End Sub _"{Xi2@H  
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'Utility function to read the contents of a file into an array of strings. {.]7!ISl5  
Function ReadFile(ByVal fileName As String, _ !n%j)`0M  
                  ByRef lineArray() As String) As Long W%Fv p;\`  
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    ReadFile = -1 rT>wg1:  
    Dim oFSO As Object Vt ohL+  
    Set oFSO = CreateObject("Scripting.FileSystemObject") Fj!U|l\_9  
    Erase lineArray *NQ/UXE  
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    Dim fid As Long 8?C5L8)  
    If oFSO.fileexists( fileName ) Then mp3s-YfRc  
        fid = FreeFile() oL<St$1  
        Open fileName For Input As fid ./~(7o$  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) Yr|4Fl~U  
        Close fid IVmo5,&5(  
    End If  AOx[  
    Set oFSO = Nothing 2t,zLwBdnJ  
    Return UBound( lineArray ) 8b=_Y;  
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End Function Q59W#e)  
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Sub GetFileList( ByVal in_dir As String, _ ;n},"&  
                 ByRef in_flist() As String ) T]$U""  
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    'Redimension the file list array % u6Sr5A[s  
    Erase in_flist 8;X-)&R  
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    'Tracks how many files are found _vZOZKS+  
    Dim fCount As Long )`}:8y?  
    fCount = 0 PI<vxjOK`  
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    'Recurse directory and search for text files Q@HV- (A  
    Dim f As String g,Y/M3>(  
    f = Dir$(in_dir & "*.txt") B erwI 7!=  
    While f <> "" u=yOu^={  
        ReDim Preserve in_flist(fCount) .|=\z9_7S8  
        in_flist(fCount) = f xezcAwW  
        fCount += 1 :Q q#Z  
        f = Dir$() {XHh8_ ^&  
    Wend ?%kV?eu'  
    ReDim Preserve in_flist(fCount-1)

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