[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： _E C7r>V&  
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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。 h4`8C]  
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背景： dA)T>  
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。 rfwJLl/  
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。 7Eyi~jes  
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步骤 0AO^d[v  
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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。 H$I~Vz[\yb  
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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） ~J].~^[  
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 _&-d0'+  
例如下所示： =Y2 Rht  
Sample name:  EDF-C1-56 _Raf7W  
Merging data from file EDF-C1-56 0-0.txt
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Finished merging RPC data for sample EDF-C1-56 YiZk|K_  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt kY]"3a  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 Y<T0yl?  
a. 创建一个新的散射库 p/Ul[7A4e  
b. 散射模型命名 u9"kF  
c. 改变散射模型为“Tabulated BSDF”. ]+I9{%zB%8  
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 ） p"0#G&-  
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。 |=q~X}DA  
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， };'@'   
g. 点击OK }b1G21Dc!  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 s{^B98d+W  
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脚本代码： J1w[gf]J  
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'#Language "WWB-COM" }c8nn  
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Option Explicit _mm(W=KiL  
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Sub Main 3q%z
 
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    'Cleanup : #a  
    ClearOutputWindow() i]MemM-  
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    Print "Merging RPC Photonics BSDF Data Files" f-M:ap(O  
    SetTextColor(255,0,0) ()aCE^C  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." t'2A)S  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 94B%_  
    SetTextColor(0,0,0) *O[/KR%  
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    'Current directory of this script (should be the same as the text files being merged) 1m5l((d  
    Dim cDir As String 'HWl_M  
    cDir = MacroDir$ & "\" 8&EJ.CQ  
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    'Array which will be populated with the list of files to be merged HO<|EH~lu  
    Dim fList() As String, curFile As String ,&BNN]k  
    GetFileList( cDir, fList ) )%^l+w+&  
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    Print "" j sPavY  
    Print "Files found for merging:" 6Amt75RY  
    For Each curFile In fList CR$wzjP j  
        Print Chr(9) & curFile (xo`*Q,+  
    Next >5t! Xt  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement.
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    Dim nameArray() As String, sampName As String ,P9F*;Dj  
    nameArray = Split(fList(0)," 0-0.txt") 4bk`i*-O  
    sampName  = nameArray(0) *)RKU),3nL  
    Print "" [)
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    Print "Sample name: " & Chr(9) & sampName NFTv4$5d  
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    'Open an output file and write the FRED header data _#V&rY&@  
    Dim outFile As String K9zr]7;th  
    outFile = cDir & sampName & "_FRED.txt" zr!7*, p  
    Open outFile For Output As #1 c!E{fSP  
    Print #1, "type bsdf_data" ~Eg]Auk7  
    Print #1, "format angles=deg bsdf=value scale=1" {m*lt3$k  
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    'Loop the file list, skip the two header lines and write the remaining data to file anSZWQ  
    Dim lineArray() As String, curLine As Long l,J>[Q`<  
    For Each curFile In fList 8gavcsVE[  
        Print "Merging data from file " & curFile ?EC\.{  
        ReadFile( cDir & curFile, lineArray ) }Nr6oUn  
        For curLine = 2 To UBound(lineArray) &.E/%pQ`  
            Print #1, lineArray(curLine) X|\`\[  
        Next ]$drBk86bh  
    Next #HV5M1mb  
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    'Close the output file g)6>=Qo`8E  
    Close #1 T
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    Print "Finished merging RPC data for sample " & sampName <P#BQt f  
    Print "FRED formatted data file: " & Chr(9) & outFile sgOau\E  
End Sub T'}kCnp  
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'Utility function to read the contents of a file into an array of strings. bit|L7*14  
Function ReadFile(ByVal fileName As String, _ I\TSVJk^Xi  
                  ByRef lineArray() As String) As Long *sldv  
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    ReadFile = -1 Ja~8ZrcY  
    Dim oFSO As Object Q
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    Set oFSO = CreateObject("Scripting.FileSystemObject") xS UpVK  
    Erase lineArray 'o)Y!VYnJF  
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    Dim fid As Long )y8M
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    If oFSO.fileexists( fileName ) Then d:hnb)I$*  
        fid = FreeFile() `xx.,;S  
        Open fileName For Input As fid wb9(aS4  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) &wlD`0
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        Close fid 07Yak<+~  
    End If {d<XDx4`  
    Set oFSO = Nothing O#k; O*s'  
    Return UBound( lineArray ) '4M{Xn}@  
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End Function lD0a<L3  
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Sub GetFileList( ByVal in_dir As String, _ 7>z {2D  
                 ByRef in_flist() As String ) R +@|#!  
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    'Redimension the file list array iT:i '\~  
    Erase in_flist 4!Radl3`  
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    'Tracks how many files are found JkN*hm?  
    Dim fCount As Long <.Zh{"$qo  
    fCount = 0 i#4+l$q  
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    'Recurse directory and search for text files Sed8Q-m  
    Dim f As String /RJ]MQ\*O  
    f = Dir$(in_dir & "*.txt") U\Y0v.11  
    While f <> "" c$,1j%[)  
        ReDim Preserve in_flist(fCount) e|:\Ps`8  
        in_flist(fCount) = f QDW,e]A  
        fCount += 1 8H-yT1  
        f = Dir$() Ms+ekY)  
    Wend #/ePpSyD  
    ReDim Preserve in_flist(fCount-1) @p~scE.#\  
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End Sub 3#'8S_  
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