[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： !T(Omve)  
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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。 M:f=JuAx  
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背景： }@6 %yR  
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。 uL AXN  
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。 9?,.zc
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步骤 wcT6d?*5  
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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。 dV
  
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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） 74Wg@!P  
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 [i#Gqx>'w  
例如下所示： YcZ4y@6"  
Sample name:  EDF-C1-56 1\{F.v  
Merging data from file EDF-C1-56 0-0.txt RyD$4jk+T"  
Finished merging RPC data for sample EDF-C1-56 P?7b,
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FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt +N_%|!F-c  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 H;&t"Ql.  
a. 创建一个新的散射库 X+@,vCC  
b. 散射模型命名 1R9/AP  
c. 改变散射模型为“Tabulated BSDF”. E=trJge  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） !2Iwuru  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 z59J=?|  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， h!GixN?  
g. 点击OK ^4NH.q{  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 RL9BB.  
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脚本代码： B[V=l<J  
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'#Language "WWB-COM" D*,H%xA  
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Option Explicit czRh.kz,  
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Sub Main mX_`rvYII  
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    'Cleanup
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    ClearOutputWindow() rd{(
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    Print "Merging RPC Photonics BSDF Data Files" `_i-BdW  
    SetTextColor(255,0,0) `<d>C}9  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." )_?$B6hf,&  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." .`].\Zykf  
    SetTextColor(0,0,0) [K- s\  
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    'Current directory of this script (should be the same as the text files being merged) RoZV6U~  
    Dim cDir As String zPYa@0I  
    cDir = MacroDir$ & "\" {{,%p#/b  
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    'Array which will be populated with the list of files to be merged bHnQLJ  
    Dim fList() As String, curFile As String IIZsN*^  
    GetFileList( cDir, fList ) ,V?,I9qf  
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    Print "" 5WYU&8+]{:  
    Print "Files found for merging:" i|mA/ e3b  
    For Each curFile In fList 9A!qg<  
        Print Chr(9) & curFile T-TH. R  
    Next %?jf.p*kY  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ehq6.+l  
    Dim nameArray() As String, sampName As String W]OT=6u8o  
    nameArray = Split(fList(0)," 0-0.txt") IpxjP\  
    sampName  = nameArray(0) |z%,W/Ef  
    Print "" n21J7;\/+  
    Print "Sample name: " & Chr(9) & sampName E.9F~&DPJ<  
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    'Open an output file and write the FRED header data _?ZT[t<  
    Dim outFile As String U<b!$"P9  
    outFile = cDir & sampName & "_FRED.txt" -,&Xp>u\  
    Open outFile For Output As #1 T_WQzEL^  
    Print #1, "type bsdf_data" }UrtDXhA  
    Print #1, "format angles=deg bsdf=value scale=1" |.A>0-']M  
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    'Loop the file list, skip the two header lines and write the remaining data to file E_oe1C:  
    Dim lineArray() As String, curLine As Long 51
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    For Each curFile In fList W#!\.m`5  
        Print "Merging data from file " & curFile o[6hUX0tN  
        ReadFile( cDir & curFile, lineArray ) *)<tyIHd  
        For curLine = 2 To UBound(lineArray) /L.a:Er$  
            Print #1, lineArray(curLine) X#yl8k_  
        Next \<} nn?~n  
    Next Ar==@777j  
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    'Close the output file fVM%.`  
    Close #1 d\v _!
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    Print "Finished merging RPC data for sample " & sampName e9d~Xi16KY  
    Print "FRED formatted data file: " & Chr(9) & outFile ,#G@ri:B  
End Sub SxDE
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'Utility function to read the contents of a file into an array of strings. N+\*:$>zt6  
Function ReadFile(ByVal fileName As String, _ 9M<? *8)  
                  ByRef lineArray() As String) As Long ;IT^SHym  
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    ReadFile = -1 yrjm0BM#  
    Dim oFSO As Object j*5VJ:  
    Set oFSO = CreateObject("Scripting.FileSystemObject") KJd;c.  
    Erase lineArray bA)Xjq)Rr  
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    Dim fid As Long VxCH}&!  
    If oFSO.fileexists( fileName ) Then fp7Qb $-A  
        fid = FreeFile() r!#3>
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        Open fileName For Input As fid .\VjS^o&Z&  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 1}6pq2  
        Close fid wb}tN7~Y;  
    End If <LJ$GiU  
    Set oFSO = Nothing ld $`5!Z  
    Return UBound( lineArray ) 0e7!_/9  
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End Function '|Oi#S  
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Sub GetFileList( ByVal in_dir As String, _ '.=Z2O3p  
                 ByRef in_flist() As String ) $?\],T  
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    'Redimension the file list array *%O1d.,  
    Erase in_flist
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    'Tracks how many files are found
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    Dim fCount As Long [D t`@Dm  
    fCount = 0 5?b9[o+D  
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    'Recurse directory and search for text files U2aE:$oeYi  
    Dim f As String & zG=  
    f = Dir$(in_dir & "*.txt") E|>I/!{u7`  
    While f <> "" m[}$&i$(  
        ReDim Preserve in_flist(fCount) BjH(E'K[b  
        in_flist(fCount) = f G2Apm`/ y  
        fCount += 1 qSQjAo4t@  
        f = Dir$() {b?)|@)is  
    Wend uk1IT4+  
    ReDim Preserve in_flist(fCount-1) ~_raI7,  
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End Sub ={fi&j  
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