[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： >l>;"R9N  
fOHgz,x=  
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。 0DZ}8"2  
9>OPaLn  
背景： hoOT]Bsn  
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。 @[=K`n:n_  
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。 5gg Yg$  
KJs/4oR;  
rgK:ujzW!  
wuV*!oefo  
步骤 {\P`-'C  
}5nVZ;  
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。 f6*6*=  
8NUVHcB6  
A><q-`bw  
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）  W>HGB  
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 zZhA]J  
例如下所示： f)b+>!  
Sample name:  EDF-C1-56 'LyEdlC]  
Merging data from file EDF-C1-56 0-0.txt Z=|NoDZ  
Finished merging RPC data for sample EDF-C1-56 ?nwFc3qw  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt `zw^ WbCO{  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ^tr?y??k  
a. 创建一个新的散射库 H?a1XEY/  
b. 散射模型命名 tW8&:L,m  
c. 改变散射模型为“Tabulated BSDF”. oR1HJ2>Z1  
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 ） A#@9|3  
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。 !4 =]@eFk  
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， 26D,(Y$*  
g. 点击OK ALO0yc  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 ib,BYFKEW  
kgZiyPcw  
';>A=m9(4%  
脚本代码： 937 z*mh  
Ob~7r*q  
'#Language "WWB-COM" {: H&2iF  
.:U`4->E  
Option Explicit |RS(QU<QE  
$.0l%
$7  
Sub Main .m^L,;+2  
"rJJ~[Y  
    'Cleanup {}A1[Y|  
    ClearOutputWindow() ;J&p17~T9  
`({Bi!%i  
    Print "Merging RPC Photonics BSDF Data Files"  ~0T;T  
    SetTextColor(255,0,0) /9 ^F_2'_  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." .G~Y`0  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." /]
@1IC{Lk  
    SetTextColor(0,0,0) <} BuU!  
KccIYn~  
    'Current directory of this script (should be the same as the text files being merged) _ mJP=+i  
    Dim cDir As String x,rK4L7U  
    cDir = MacroDir$ & "\" <{Pr(U*7}  
}9FAM@x1K&  
    'Array which will be populated with the list of files to be merged 4b/>ZHFOF;  
    Dim fList() As String, curFile As String -
 fx?@  
    GetFileList( cDir, fList ) TilCP"(6D  
gT&s &0_7  
    Print "" ,g~Iup  
    Print "Files found for merging:" 4F=cER6l  
    For Each curFile In fList DKnlbl1^?  
        Print Chr(9) & curFile 'lIj89h<E  
    Next H~ `JAplr  
xJ(}?0h-X  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. XN Gw@$  
    Dim nameArray() As String, sampName As String ZdsYIRU#  
    nameArray = Split(fList(0)," 0-0.txt") 0Uf.aP  
    sampName  = nameArray(0) cq
So%a2  
    Print "" CEXD0+\q  
    Print "Sample name: " & Chr(9) & sampName nb|KIW  
\96aHOk<  
    'Open an output file and write the FRED header data NQu.%=  
    Dim outFile As String y8e'weK  
    outFile = cDir & sampName & "_FRED.txt" r Y#^C  
    Open outFile For Output As #1 .kf FaK  
    Print #1, "type bsdf_data" /y-eVu6  
    Print #1, "format angles=deg bsdf=value scale=1" Q| _e=  
TO5#iiM)  
    'Loop the file list, skip the two header lines and write the remaining data to file N/V~>UJ0{*  
    Dim lineArray() As String, curLine As Long 8ZN"-]*  
    For Each curFile In fList VoG:3qN  
        Print "Merging data from file " & curFile : pkOZ+t  
        ReadFile( cDir & curFile, lineArray ) 4 >`2vb  
        For curLine = 2 To UBound(lineArray) pW,)yo4  
            Print #1, lineArray(curLine) F[5sFkM7  
        Next 'Z}3XVZEN  
    Next J-U5_>S  
$)v`roDD.  
    'Close the output file {Q~HMe`,  
    Close #1 ,
>Yl(=&  
s,|"s|P  
    Print "Finished merging RPC data for sample " & sampName }v4T&/vt-  
    Print "FRED formatted data file: " & Chr(9) & outFile |x+g5~$  
End Sub ,~nrNkhp  
j0uu*)Rk  
'Utility function to read the contents of a file into an array of strings. HE{JiAf  
Function ReadFile(ByVal fileName As String, _ 4Je[!X@C  
                  ByRef lineArray() As String) As Long Y9r##r+  
08MY=PC~R  
    ReadFile = -1 Q^}Ib[  
    Dim oFSO As Object g/(3D  
    Set oFSO = CreateObject("Scripting.FileSystemObject") ESyb34T`  
    Erase lineArray X4dxH_@  
2kkqPBc_  
    Dim fid As Long y}*J_7-  
    If oFSO.fileexists( fileName ) Then i}
=n6  
        fid = FreeFile() ZGsI\3S  
        Open fileName For Input As fid _L% =Q ulu  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) {g7~e{2  
        Close fid +[B@83  
    End If +cwuj  
    Set oFSO = Nothing 1haNpLfS>  
    Return UBound( lineArray ) 3k# h
!Z  
}Hy4^2B  
End Function 8s9ZY4_  
S.R|Bwj}(Y  
Sub GetFileList( ByVal in_dir As String, _ ?^gq  
                 ByRef in_flist() As String ) zFm:=,9  
.X\9vVJ  
    'Redimension the file list array ^Rh`XE  
    Erase in_flist ]Ei*I}  
m"f3hd4D_q  
    'Tracks how many files are found 21sXCmYR,t  
    Dim fCount As Long ` #; "  
    fCount = 0 Qpocj:  
@bF4'M  
    'Recurse directory and search for text files Y+nk:9  
    Dim f As String BF/l#)$y
K  
    f = Dir$(in_dir & "*.txt") ?)O!(=6%'  
    While f <> "" }!QVcu"+t/  
        ReDim Preserve in_flist(fCount)
b_w(F_0  
        in_flist(fCount) = f f-`C1|\w  
        fCount += 1 a\B'Q
e+  
        f = Dir$() +!cibTQTT  
    Wend ZtGtJV"H  
    ReDim Preserve in_flist(fCount-1) S0w:R:q}L  
@
kWRI*m  
End Sub !,9;AMO -  
$ww0$  
xQDWnpFc  
QQ：2987619807 |ngv{g