[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： p"0#G&-  
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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。 "1a;);S=*)  
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背景： %6Gg&Y$j!  
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。 g (w/  
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。 }d.X2?  
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步骤 O\<zQ2m  
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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。 #zsaQg, B  
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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） 4Fp[94b  
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 ta?NO{*  
例如下所示： N:lE{IvRJ  
Sample name:  EDF-C1-56 ]wid;<  
Merging data from file EDF-C1-56 0-0.txt 63E6nW M  
Finished merging RPC data for sample EDF-C1-56 bSe\d~{  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt v]SxZLa  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 /si<Fp)z  
a. 创建一个新的散射库 UNDl&C2vz  
b. 散射模型命名 dfFw6R  
c. 改变散射模型为“Tabulated BSDF”. {~9zuNi  
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 ） i|{psA  
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。 1hw.gn*JK>  
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， HO<|EH~lu  
g. 点击OK HGYTh"R  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 s~OcL  5  
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脚本代码： ]njNSn  
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'#Language "WWB-COM" (7qlp*8.s  
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Option Explicit Phi5;U!  
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Sub Main xn`)I>v  
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    'Cleanup VJ\qp%  
    ClearOutputWindow() :6Z2@9.}w  
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    Print "Merging RPC Photonics BSDF Data Files" 8y27O  
    SetTextColor(255,0,0) #QFz /6  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." e:HORc~U  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." vb^fx$V  
    SetTextColor(0,0,0) OB.rETg  
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    'Current directory of this script (should be the same as the text files being merged) E_~e/y"-  
    Dim cDir As String [;wJM|Z J0  
    cDir = MacroDir$ & "\" ;B@#,6t/  
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    'Array which will be populated with the list of files to be merged
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    Dim fList() As String, curFile As String 2-@)'6"n  
    GetFileList( cDir, fList ) 2|j=^  
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    Print "" ^N^G?{EV/#  
    Print "Files found for merging:" +.~K=.O)  
    For Each curFile In fList LM eI[Ji  
        Print Chr(9) & curFile RNc:qV<H  
    Next ;t*SG*Vi  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Fj`k3~tUw  
    Dim nameArray() As String, sampName As String (d#&m+ g]  
    nameArray = Split(fList(0)," 0-0.txt") :m`D  
    sampName  = nameArray(0) C&yZ`[K  
    Print "" jOT/|k  
    Print "Sample name: " & Chr(9) & sampName lW5Lwyt8  
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    'Open an output file and write the FRED header data IM1&g7Qs2  
    Dim outFile As String $,K@xq5  
    outFile = cDir & sampName & "_FRED.txt" f+9WGNpw  
    Open outFile For Output As #1 c@g(_%_|2  
    Print #1, "type bsdf_data" /)kJ iV  
    Print #1, "format angles=deg bsdf=value scale=1"
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    'Loop the file list, skip the two header lines and write the remaining data to file Li
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    Dim lineArray() As String, curLine As Long 5Xr})%L  
    For Each curFile In fList VLV]e_D6s  
        Print "Merging data from file " & curFile B9|s`o)!  
        ReadFile( cDir & curFile, lineArray ) 693"Pg8b  
        For curLine = 2 To UBound(lineArray) :4AIYk=q  
            Print #1, lineArray(curLine) )Wle CS_
 
        Next O#k; O*s'  
    Next '4M{Xn}@  
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    'Close the output file Ye]K 74M.  
    Close #1 L*4"D4V  
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    Print "Finished merging RPC data for sample " & sampName 9ye!kYF,  
    Print "FRED formatted data file: " & Chr(9) & outFile J;~YD$  
End Sub Pl=)eq YY  
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'Utility function to read the contents of a file into an array of strings. ~D@YLW1z(  
Function ReadFile(ByVal fileName As String, _ &Z>??|f  
                  ByRef lineArray() As String) As Long +EjXoW7V  
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    ReadFile = -1 oUn+t
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    Dim oFSO As Object LpY{<:y  
    Set oFSO = CreateObject("Scripting.FileSystemObject") -ysNo4#e&  
    Erase lineArray Ej)7
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    Dim fid As Long L+G0/G}O\  
    If oFSO.fileexists( fileName ) Then ^;ZpK@Luk  
        fid = FreeFile() uDND o  
        Open fileName For Input As fid SW%}S*h  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) kSiyMDY-  
        Close fid $1B?@~&  
    End If md<^x(h"<  
    Set oFSO = Nothing 6O,k! y>  
    Return UBound( lineArray ) eH7x>[lH.  
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End Function sN8pwRjb  
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Sub GetFileList( ByVal in_dir As String, _ . q -
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                 ByRef in_flist() As String ) HI{q#  
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    'Redimension the file list array eYP^.U)  
    Erase in_flist @;Jv/N6@  
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    'Tracks how many files are found !&Q?ASJH  
    Dim fCount As Long =PY{Elf  
    fCount = 0 E9mu:T  
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    'Recurse directory and search for text files PX/Y?DP  
    Dim f As String 5?HwM[`  
    f = Dir$(in_dir & "*.txt") tz2=l.1  
    While f <> "" '*L6@e#U  
        ReDim Preserve in_flist(fCount) w>cqsTq  
        in_flist(fCount) = f #8M?y*<I  
        fCount += 1 hDTC~~J/  
        f = Dir$() f8[O]MrO;  
    Wend P<Bx1H-z-  
    ReDim Preserve in_flist(fCount-1) O$r/{{I.  
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End Sub awo'#Y2>