[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： gV@xu)l  
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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。 viG=Ap.Th  
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背景： %_E5B6xi{  
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。 mHMsK}=~  
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。 HAO-|=c4  
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步骤 la{?
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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。 zdJPMNHg  
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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） LkJq Bg  
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 TYuP EVEXZ  
例如下所示： HCOsVTl,  
Sample name:  EDF-C1-56 H,KH}25  
Merging data from file EDF-C1-56 0-0.txt O;VqrO  
Finished merging RPC data for sample EDF-C1-56 8x1!15Wiz  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt eFs5l  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ;*qXjv& K  
a. 创建一个新的散射库 i%133in  
b. 散射模型命名 ^iEf"r  
c. 改变散射模型为“Tabulated BSDF”. !=21K0~t#  
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 ） +iN!$zF5]  
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。 ?3N/
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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， BMAWjEr  
g. 点击OK waC i9  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 2f:hz  
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脚本代码： Z%o.kd"  
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'#Language "WWB-COM" z&!o1uq  
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Option Explicit 9*iVv)jd  
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Sub Main X{xkXg8h  

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    'Cleanup /w dvm4  
    ClearOutputWindow() Z=
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    Print "Merging RPC Photonics BSDF Data Files" L`M{bRl+1  
    SetTextColor(255,0,0) <*iFVjSI(  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." <8
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    Print "Note: Do not run this script multiple times without deleting the output file between executions." >7a ENKOg:  
    SetTextColor(0,0,0) <EyJ $$  
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    'Current directory of this script (should be the same as the text files being merged) 7oLlRU  
    Dim cDir As String ~*h)`uM  
    cDir = MacroDir$ & "\" u@Gum|_=N
 
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    'Array which will be populated with the list of files to be merged b?=r%D->w  
    Dim fList() As String, curFile As String XH0{|#hwN  
    GetFileList( cDir, fList ) fC^d@4ha  
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    Print "" q:vN3#=^qf  
    Print "Files found for merging:" fc:87ZR{K  
    For Each curFile In fList B7A.~'=  
        Print Chr(9) & curFile jY9tq[~/  
    Next i]zh8|">  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ,-d2wzhW  
    Dim nameArray() As String, sampName As String LCRWC`%&  
    nameArray = Split(fList(0)," 0-0.txt") #\F8(lZ  
    sampName  = nameArray(0) l+(B~v  
    Print "" fX:G;vYn  
    Print "Sample name: " & Chr(9) & sampName Z^F>sUMR  
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    'Open an output file and write the FRED header data /q]f
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    Dim outFile As String LfnQcI$kO  
    outFile = cDir & sampName & "_FRED.txt" /jaO\
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    Open outFile For Output As #1 3Qv9=q|[b  
    Print #1, "type bsdf_data" r+]a  
    Print #1, "format angles=deg bsdf=value scale=1" S-6i5H"B&  
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    'Loop the file list, skip the two header lines and write the remaining data to file
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    Dim lineArray() As String, curLine As Long /$8& r  
    For Each curFile In fList 2#`d:@r  
        Print "Merging data from file " & curFile K=sk1<>)m  
        ReadFile( cDir & curFile, lineArray ) ;rh=63g  
        For curLine = 2 To UBound(lineArray) 10dK%/6/O  
            Print #1, lineArray(curLine) }&ew}'*9)  
        Next kYS\TMt,C  
    Next EA:_PBZ  
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    'Close the output file T2T?)_f /  
    Close #1 <p_2&&?  
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    Print "Finished merging RPC data for sample " & sampName } F*=+n  
    Print "FRED formatted data file: " & Chr(9) & outFile usugjx^p  
End Sub F0'o!A#|(  
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'Utility function to read the contents of a file into an array of strings. 78mJ3/?rC  
Function ReadFile(ByVal fileName As String, _ ^3&-!<*  
                  ByRef lineArray() As String) As Long DqH]FS?]  
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    ReadFile = -1
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    Dim oFSO As Object k"`^vV[{F  
    Set oFSO = CreateObject("Scripting.FileSystemObject") ]%5gPfv[T  
    Erase lineArray Yj>\WH  
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    Dim fid As Long j]9,yi  
    If oFSO.fileexists( fileName ) Then t1l
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        fid = FreeFile() #b=*hi`E  
        Open fileName For Input As fid ^
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        lineArray = Split(Input(LOF(fid), fid), vbCrLf) NjA\*M9  
        Close fid GsWf$/iC:  
    End If `? f sU  
    Set oFSO = Nothing $)O\i^T  
    Return UBound( lineArray ) DV
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End Function 28,HZaXhc  
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Sub GetFileList( ByVal in_dir As String, _ ukXKUYNm8  
                 ByRef in_flist() As String ) 4kLTKm:G  
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    'Redimension the file list array 1w?DSHe  
    Erase in_flist iHOvCrp+X  
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    'Tracks how many files are found 62xAS#\K>  
    Dim fCount As Long 'P >h2^z  
    fCount = 0 W QyMM@#  
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    'Recurse directory and search for text files fPsUIlI/A  
    Dim f As String [%7oq;^J  
    f = Dir$(in_dir & "*.txt") `>$l2
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    While f <> "" -+.-Ab7  
        ReDim Preserve in_flist(fCount) oMZ|)(7C  
        in_flist(fCount) = f Bdf]?s[]  
        fCount += 1 \E:l E/y  
        f = Dir$() $QuSmA<4lS  
    Wend o7 X5{  
    ReDim Preserve in_flist(fCount-1) WG*S:_?  
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End Sub kv/mqKVr