[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： &
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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。 hRI?>an  
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背景： ?'^dYQ4  
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。 QB<~+dW  
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。 c>b{/92%  
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步骤
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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。 }G ^nK m  
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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） 2o<aEn&7|e  
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 _-:C
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例如下所示： $2>"2*,04  
Sample name:  EDF-C1-56 il[waUfmD  
Merging data from file EDF-C1-56 0-0.txt *q*$%H  
Finished merging RPC data for sample EDF-C1-56 \q
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FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt V|vXxWm/  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ]-{A"tJ  
a. 创建一个新的散射库 D}OhmOu3  
b. 散射模型命名 >9Z7l63+}  
c. 改变散射模型为“Tabulated BSDF”. .c]@xoC  
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 ） fn, YH  
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。 eZ|_wB'r  
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， xs^wRE_  
g. 点击OK <AN5>:k[pM  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 ^ pNA_s!S  
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脚本代码： 6 2LLfD  
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'#Language "WWB-COM" K6 c[W%Va  
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Option Explicit u,JUMH]@  
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Sub Main VK% j45D`  
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    'Cleanup jJV1 /]TJ  
    ClearOutputWindow() iZE7 B7K  
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    Print "Merging RPC Photonics BSDF Data Files" L}VQc9"gc  
    SetTextColor(255,0,0) w"q^8"j!  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 4k)0OQeW6  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." =}%Q}aPp  
    SetTextColor(0,0,0) P=m l;xp  
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    'Current directory of this script (should be the same as the text files being merged) Tbj}04;I  
    Dim cDir As String !X\aZ{}Q  
    cDir = MacroDir$ & "\" yL_\&v  
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    'Array which will be populated with the list of files to be merged sMcN[r  
    Dim fList() As String, curFile As String rw#?NI:  
    GetFileList( cDir, fList ) 5P[urOvV  
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    Print "" k1fX-2H  
    Print "Files found for merging:" /0r6/ _5-.  
    For Each curFile In fList 7!JBF{,=  
        Print Chr(9) & curFile bd&Nf2  
    Next VgO.in^q  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 87rHW@\](  
    Dim nameArray() As String, sampName As String <f;Xs(  
    nameArray = Split(fList(0)," 0-0.txt") A\v]ZN4  
    sampName  = nameArray(0) hw1J <Pl*  
    Print "" @@& ?,3  
    Print "Sample name: " & Chr(9) & sampName J+=?taZ  
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    'Open an output file and write the FRED header data "\qm+g  
    Dim outFile As String 6|Xm8,]yRw  
    outFile = cDir & sampName & "_FRED.txt" BOme`0
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    Open outFile For Output As #1 UB]]oC<  
    Print #1, "type bsdf_data" \R,8xID_t  
    Print #1, "format angles=deg bsdf=value scale=1" *l)}o4-$  
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    'Loop the file list, skip the two header lines and write the remaining data to file gp4@6HuUd  
    Dim lineArray() As String, curLine As Long o)M<^b3KO  
    For Each curFile In fList l@g%A# _  
        Print "Merging data from file " & curFile -+WE9  
        ReadFile( cDir & curFile, lineArray ) V1\Rj0#G  
        For curLine = 2 To UBound(lineArray) ZdlQ}l#F  
            Print #1, lineArray(curLine) 9:7&`JlC#  
        Next Q+dLWFI  
    Next <+: PTG/('  
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    'Close the output file Bh7dAV(  
    Close #1 l8+;)2p!  
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    Print "Finished merging RPC data for sample " & sampName $ZRvvm!f  
    Print "FRED formatted data file: " & Chr(9) & outFile LUEZqIf  
End Sub beFD}`  
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'Utility function to read the contents of a file into an array of strings. Q@/Z~xw"'I  
Function ReadFile(ByVal fileName As String, _ !fG}<6&i  
                  ByRef lineArray() As String) As Long ;ibOd~  
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    ReadFile = -1 !"dAwG?S  
    Dim oFSO As Object =gHUY&sPu8  
    Set oFSO = CreateObject("Scripting.FileSystemObject") okH*2F(-  
    Erase lineArray \`-a'u=S  
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    Dim fid As Long @k\npFKQm  
    If oFSO.fileexists( fileName ) Then {=9"WN
 
        fid = FreeFile() [I=1   
        Open fileName For Input As fid ,OBJ>_5  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 2 @t?@,c  
        Close fid [BFPIVD)h]  
    End If xo#K_"E  
    Set oFSO = Nothing mj&$+zM>  
    Return UBound( lineArray ) c1Hp  
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End Function C;']FmK]  
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Sub GetFileList( ByVal in_dir As String, _ $8>II0C.  
                 ByRef in_flist() As String ) #1Iev7w  
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    'Redimension the file list array !wH'dsriD  
    Erase in_flist ~r&+18Z;  
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    'Tracks how many files are found &)!4rABn  
    Dim fCount As Long v>sjS3  
    fCount = 0 hZ-?-F?*@  
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    'Recurse directory and search for text files nRcy`A%  
    Dim f As String ISg-?h/  
    f = Dir$(in_dir & "*.txt") C%AN4Mo  
    While f <> "" !nTI(--  
        ReDim Preserve in_flist(fCount) VUzRA"DP|  
        in_flist(fCount) = f N[;R8SP  
        fCount += 1 %Q zk aXJ  
        f = Dir$() rtz ]PH  
    Wend t]8nRZ1  
    ReDim Preserve in_flist(fCount-1) ~{l @
  

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End Sub =" pNE#