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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 " 2Dz5L1v  
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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。 SsIy;l  
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背景 >8"oO[U5>  
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。 C\ZL*,%}  
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 9TIyY`2!  
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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。 J}c57$Z  
图2. RPC Photonics工程漫射体不同类型的散射数据
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) IEfzu L<v  
3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 CC0@RU  
例如下所示: `MA ee8u'  
Sample name:  EDF-C1-56 w},' 1  
Merging data from file EDF-C1-56 0-0.txt ig4wwd@|  
Finished merging RPC data for sample EDF-C1-56 K kP}z  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt u_;*Ay  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面
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a. 创建一个新的散射库 jL(=<R(~y  
b. 散射模型命名 |NJe4lw+?  
c. 改变散射模型为“Tabulated BSDF”. SpPG  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) >@KQ )p' `  
e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 *Z>Yv37P  
f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, ]( V+ qj  
g. 点击OK H%t/-'U?  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 e^&QT  
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脚本代码 ! E` Tt[  
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'#Language "WWB-COM" Fq!12/Nn  
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Option Explicit a*REx_gLG  
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Sub Main BF@(`D&>  
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    'Cleanup (Z"QHfO'  
    ClearOutputWindow() f{xR s-u]  
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    Print "Merging RPC Photonics BSDF Data Files" 5!$m3j_,]?  
    SetTextColor(255,0,0) /+l3 BeL  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." pJrc\`D  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." _QbLg"O  
    SetTextColor(0,0,0) ; Xrx>( n  
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    'Current directory of this script (should be the same as the text files being merged) |:$D[=  
    Dim cDir As String vpcHJ^19  
    cDir = MacroDir$ & "\" cTu7U=%  
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    'Array which will be populated with the list of files to be merged -ZFeE[Z  
    Dim fList() As String, curFile As String gYVk5d|8@4  
    GetFileList( cDir, fList ) cN0|! nm*  
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    Print "" ;j])h !8X  
    Print "Files found for merging:" ZHUA M59bx  
    For Each curFile In fList 4d4le  
        Print Chr(9) & curFile Rn~FCj,-  
    Next Qmle0ae  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. J\<7M8   
    Dim nameArray() As String, sampName As String -FytkM^]6  
    nameArray = Split(fList(0)," 0-0.txt") ^'.=&@i-  
    sampName  = nameArray(0) \?c0XD  
    Print "" ?jbE3fW  
    Print "Sample name: " & Chr(9) & sampName n)uvN  
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    'Open an output file and write the FRED header data 6NH.!}"G9  
    Dim outFile As String <9 lZ%j;  
    outFile = cDir & sampName & "_FRED.txt" 5%"${ywI  
    Open outFile For Output As #1 -NtT@ +AE  
    Print #1, "type bsdf_data" LuY`mi  
    Print #1, "format angles=deg bsdf=value scale=1" s, m+q)  
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    'Loop the file list, skip the two header lines and write the remaining data to file s|rlpd4y  
    Dim lineArray() As String, curLine As Long e `zEsLs@  
    For Each curFile In fList TJ[C,ic=D  
        Print "Merging data from file " & curFile D.Rk{0se8  
        ReadFile( cDir & curFile, lineArray ) vK6YU9W~J  
        For curLine = 2 To UBound(lineArray) >Z?fX  
            Print #1, lineArray(curLine) 4@OnMj{M  
        Next c[E{9wp v  
    Next RR!(,j^M  
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    'Close the output file J_YbeZ]  
    Close #1 } [}u5T`w>  
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    Print "Finished merging RPC data for sample " & sampName GdG1e%y]z  
    Print "FRED formatted data file: " & Chr(9) & outFile w]GoeIg({  
End Sub (rO_ Vfaa  
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'Utility function to read the contents of a file into an array of strings. Be}e%Rk  
Function ReadFile(ByVal fileName As String, _ E]w1!Ah M  
                  ByRef lineArray() As String) As Long GY<ErS)2  
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    ReadFile = -1 i$;GEM}tv  
    Dim oFSO As Object rHPda?&H  
    Set oFSO = CreateObject("Scripting.FileSystemObject") W)JUMW2|  
    Erase lineArray pw{3I 2Ix  
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    Dim fid As Long <q hNX$t  
    If oFSO.fileexists( fileName ) Then 8(3'YNC  
        fid = FreeFile() ]#R'hL%f  
        Open fileName For Input As fid \eF5* {9  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) (UDF^  
        Close fid 44FK%TmtF  
    End If NCYN .@J  
    Set oFSO = Nothing %F-/|x1#Q  
    Return UBound( lineArray ) I7TdBe-  
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End Function *zeY<6  
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Sub GetFileList( ByVal in_dir As String, _ }MP2)6  
                 ByRef in_flist() As String ) 1)(p=<$  
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    'Redimension the file list array P`6 T;|VDk  
    Erase in_flist @QI]P{   
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    'Tracks how many files are found o^dt# &  
    Dim fCount As Long vR`-iRQ?_  
    fCount = 0 *}R5=r0  
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    'Recurse directory and search for text files nR4L4tdS  
    Dim f As String XSt5s06TM  
    f = Dir$(in_dir & "*.txt") ya5a7  
    While f <> "" vb/*ILS  
        ReDim Preserve in_flist(fCount) '7o'u]  
        in_flist(fCount) = f hu~02v5  
        fCount += 1 F7a &-  
        f = Dir$() |57KTiiNLI  
    Wend zk5sAHQ  
    ReDim Preserve in_flist(fCount-1)

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