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infotek 2020-12-15 09:37

RPC Photonics扩散片BSDF

摘要 E/ )+hK&  
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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。
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背景 UGgi)  
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。 [RuY'  
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。 v[GHqZ  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 q;JQs:U!  
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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。 I78pul8!  
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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) SO"P3X  
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 ?sE21m?b-  
例如下所示: ,Fiiw  
Sample name:  EDF-C1-56 u> Hx#R<*%  
Merging data from file EDF-C1-56 0-0.txt @su,w,xLS  
Finished merging RPC data for sample EDF-C1-56 %4J?xhd  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt y0]O 6.{  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 _A*0K,F-  
a. 创建一个新的散射库 !vw0Y,F&  
b. 散射模型命名 Nx'j+>bz>y  
c. 改变散射模型为“Tabulated BSDF”. /.bwwj_;  
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 ) L4%LE/t|e  
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。 o~p^`5#  
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, 4G ?k31,k  
g. 点击OK g-36Q~`9v  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Vo()J4L  
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脚本代码 .+sIjd  
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'#Language "WWB-COM" \)*qW[C$a  
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Option Explicit W#7c`nm  
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Sub Main ~MF. M8  
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    'Cleanup A[MEtI=Q J  
    ClearOutputWindow() A\>qoR!Y  
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    Print "Merging RPC Photonics BSDF Data Files" }J1#UH_E  
    SetTextColor(255,0,0) t)h3GM  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ::6@mFLR  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." {1[8,Ho  
    SetTextColor(0,0,0) i fUgj8i_  
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    'Current directory of this script (should be the same as the text files being merged) IV76#jL  
    Dim cDir As String "\ md  
    cDir = MacroDir$ & "\" ryP z q}#  
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    'Array which will be populated with the list of files to be merged ^Ue>T 8  
    Dim fList() As String, curFile As String %-D2I  
    GetFileList( cDir, fList ) &>SE9w/ ?o  
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    Print "" *P>F# ~X  
    Print "Files found for merging:" <>cajQ@  
    For Each curFile In fList cVN|5Y   
        Print Chr(9) & curFile TD'1L:mv  
    Next Em;zi.Y+V  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 8I%1 `V  
    Dim nameArray() As String, sampName As String >U z3F7nHi  
    nameArray = Split(fList(0)," 0-0.txt") wXe.zLQ  
    sampName  = nameArray(0) HzV3O-Qz]  
    Print "" 'a}pWkLB  
    Print "Sample name: " & Chr(9) & sampName {>#Ya;E  
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    'Open an output file and write the FRED header data $P$OWp?b  
    Dim outFile As String t5S S]  
    outFile = cDir & sampName & "_FRED.txt" 6v-h!1p{u  
    Open outFile For Output As #1 [1Rs~T"  
    Print #1, "type bsdf_data" HjrCX>v  
    Print #1, "format angles=deg bsdf=value scale=1" umY4tNe]$  
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    'Loop the file list, skip the two header lines and write the remaining data to file CAk.2C/  
    Dim lineArray() As String, curLine As Long u7K0m! jW  
    For Each curFile In fList R b'"09)$  
        Print "Merging data from file " & curFile se&:Y&vrc~  
        ReadFile( cDir & curFile, lineArray ) o4xZaF4+  
        For curLine = 2 To UBound(lineArray) s<:J(gD  
            Print #1, lineArray(curLine) Q/':<QY  
        Next tq{ aa  
    Next |X>:"?4t  
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    'Close the output file ~e|~c<!z8@  
    Close #1 gqE{  
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    Print "Finished merging RPC data for sample " & sampName m6s32??m  
    Print "FRED formatted data file: " & Chr(9) & outFile JHcC}+H[  
End Sub % %*t{0!H+  
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'Utility function to read the contents of a file into an array of strings. H'+P7*k#M  
Function ReadFile(ByVal fileName As String, _ ,{$:Q}`  
                  ByRef lineArray() As String) As Long RX '( l  
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    ReadFile = -1 RDZl@ps8  
    Dim oFSO As Object D+tn<\LF  
    Set oFSO = CreateObject("Scripting.FileSystemObject") ,`K'qms  
    Erase lineArray ;L|%H/SH  
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    Dim fid As Long cJ&%XN  
    If oFSO.fileexists( fileName ) Then {A{=RPL  
        fid = FreeFile() [E+#+-n7  
        Open fileName For Input As fid vV8}>  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) |dXmg13( -  
        Close fid ZhW>H  
    End If OPar"z^EV  
    Set oFSO = Nothing \59+JLmP4  
    Return UBound( lineArray ) G0^NkH,k  
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End Function .Um.dXBYU  
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Sub GetFileList( ByVal in_dir As String, _ \xwE4K  
                 ByRef in_flist() As String ) 5F $W^N  
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    'Redimension the file list array z>~Hc8*]3  
    Erase in_flist A~u-Iv(U  
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    'Tracks how many files are found K[O'@v  
    Dim fCount As Long npZ=x-ce  
    fCount = 0 b k 30d  
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    'Recurse directory and search for text files l:%4@t`  
    Dim f As String GHfsq|*j,Z  
    f = Dir$(in_dir & "*.txt") b+,u_$@B  
    While f <> "" 1jpcoJ@s  
        ReDim Preserve in_flist(fCount) mJp)nF8r~  
        in_flist(fCount) = f &^9 2z:?  
        fCount += 1 4gzrxV  
        f = Dir$() W&qE_r  
    Wend a2/!~X9F  
    ReDim Preserve in_flist(fCount-1) WbB0{s  
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End Sub ]25 xX  
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