[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： aLTC#c%U  
e>1z1Q;_uv  
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。 X2!vC!4P?L  
k_.%(ZE  
背景： n\&[^Q#b|  
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 GS  
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。 DU
#6%8~  
[5^"U+`{x  
/qA\|'~  
)x
Ik
#>)  
步骤 <zH24[  
J<BBM.^]  
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。 hrPm$`  
Jw?J(ig^  
lpLjfHr  
2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） ;muxIr`?  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 hSE\RX 9  
例如下所示： 77"'?  
Sample name:  EDF-C1-56 V~` ?J6  
Merging data from file EDF-C1-56 0-0.txt  Hrm^@3  
Finished merging RPC data for sample EDF-C1-56 }$r/#F/Fn  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt q-O=Em<*  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 9m MPkgc  
a. 创建一个新的散射库 \wqi_[A  
b. 散射模型命名 Q)S0z2
 
c. 改变散射模型为“Tabulated BSDF”. ]Sg4>tp  
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 ） f}b= FV{  
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。 pme5frM|  
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， +G*2f V>  
g. 点击OK {(#Dou  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 q"4{GCavN
 
4% )I[-sH  
h-<2N)>!  
脚本代码： ;HRIB)wF  
'Y{fah  
'#Language "WWB-COM" HM ;9%rtO  
)
.e_iE[&  
Option Explicit 'H-: >'k  
:r*skV|  
Sub Main +c!v%uX  
5SKj% %B2,  
    'Cleanup )e`$'y@L$  
    ClearOutputWindow() (<!Yw|~  
D9^.Eg8
W  
    Print "Merging RPC Photonics BSDF Data Files" ~p^&`FA  
    SetTextColor(255,0,0) #]pFE.o  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 8TIc;'b
RM  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." y6tzmyg  
    SetTextColor(0,0,0) J P'|v"  
F@ lJk|*_  
    'Current directory of this script (should be the same as the text files being merged) |%.V{vgP7  
    Dim cDir As String 1 i # .h$  
    cDir = MacroDir$ & "\" H7!j5^  
~Qjf-|  
    'Array which will be populated with the list of files to be merged x TEDC,B  
    Dim fList() As String, curFile As String k_$:?$  
    GetFileList( cDir, fList ) ?v?b%hK!;  
S?n,O+q  
    Print "" LRl2@&z<  
    Print "Files found for merging:" R@_i$Df|  
    For Each curFile In fList 6'+;5M!  
        Print Chr(9) & curFile ak]:ir`o  
    Next v.Wkz9 w}  
T@0\z1,~S  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. x%HX0= (  
    Dim nameArray() As String, sampName As String !*#2~$:  
    nameArray = Split(fList(0)," 0-0.txt") G*.}EoA  
    sampName  = nameArray(0) {1a%CsCM  
    Print "" HAJK%zLc  
    Print "Sample name: " & Chr(9) & sampName KneCMFy  
;s m )f  
    'Open an output file and write the FRED header data  vU(2[  
    Dim outFile As String %!Z9: +;B  
    outFile = cDir & sampName & "_FRED.txt" TV#X@jQ  
    Open outFile For Output As #1 {T EF#iF  
    Print #1, "type bsdf_data" >;I$&  
    Print #1, "format angles=deg bsdf=value scale=1" 3Q'Q %2  
08*bYJu  
    'Loop the file list, skip the two header lines and write the remaining data to file O~Eju  
    Dim lineArray() As String, curLine As Long GcXh V  
    For Each curFile In fList S[g{ )p)  
        Print "Merging data from file " & curFile %dA6vHI,  
        ReadFile( cDir & curFile, lineArray ) >6xZF'4  
        For curLine = 2 To UBound(lineArray) ;la sk4
|  
            Print #1, lineArray(curLine) );-?~   
        Next #w_cos[I  
    Next ;jC}.] _)w  
zF'LbQz0[  
    'Close the output file t2V|moG  
    Close #1 w<}kY|A"=-  
`
<}Q4p  
    Print "Finished merging RPC data for sample " & sampName X
)P;UVR0  
    Print "FRED formatted data file: " & Chr(9) & outFile n."vCP}O+  
End Sub ;Ih:$"$!  
Y|%s =0M  
'Utility function to read the contents of a file into an array of strings. c;X8:Z=ja  
Function ReadFile(ByVal fileName As String, _ J@$h'YUF  
                  ByRef lineArray() As String) As Long /Z':wu\  
"9Q @&C  
    ReadFile = -1 2/[J<c\G  
    Dim oFSO As Object hsYS<]  
    Set oFSO = CreateObject("Scripting.FileSystemObject") >iE/t$%1  
    Erase lineArray ]mO$Tg&s~  
,mkXUW  
    Dim fid As Long 6k569c{7  
    If oFSO.fileexists( fileName ) Then -B+Pl*  
        fid = FreeFile() \53(D7+  
        Open fileName For Input As fid Tvdg:[V<  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) `XT8}9z!  
        Close fid V5ve  
    End If *2nQZ^c.  
    Set oFSO = Nothing ;/hR#>ib  
    Return UBound( lineArray ) 8OV;&Z,x  
K=S-p3\g  
End Function ]yg3|C;  
SQ$|s%)oB  
Sub GetFileList( ByVal in_dir As String, _ _>:R]2Ew  
                 ByRef in_flist() As String ) g7Xjo )  
x}\_o< d  
    'Redimension the file list array ^tp6G  
    Erase in_flist 1#]0\Y(  
4gyC?#Ed
e  
    'Tracks how many files are found suo;+T=`I  
    Dim fCount As Long tsGt,]O30  
    fCount = 0 'aj97b;lpG  
"e)C.#3  
    'Recurse directory and search for text files S_ELZO#7  
    Dim f As String d'bAM{R>  
    f = Dir$(in_dir & "*.txt") W>^WNo3YQ$  
    While f <> "" fLGZ@-qA0  
        ReDim Preserve in_flist(fCount) cD&QN9  
        in_flist(fCount) = f |->P|1 P  
        fCount += 1 PIo8mf/  
        f = Dir$() 0-
s[S  
    Wend YTb/ LeuT  
    ReDim Preserve in_flist(fCount-1) U;PGBoe  
G0e]PMeFl  
End Sub 1u9*)w  
VaV(+X  
bQTkW<7gh  
QQ：2987619807 ]H%SGQPn