[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： -.+KCt G$+  
'6dD^0dZ  
RPC Photonics公司有高品质的的工程漫射体BSDF测试数据，但它对于FRED帮助甚少，下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件，并将数据直接应用到FRED的Tabulated scatter 散射模型。 =/!{<^0  
7DC0W|Fe  
背景： .:|#9%5  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 SSA%1l2!  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 Qw{\sCH>  
@+T{M:&l  
Q
zs\|KS  
Jnu}{^~  
步骤 /64^5DjTh  
n+RUPZ  
1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 T9XW%/n  
K{r1&O>W  
=ihoVA:|  
2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） CHdet(_=v  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 0Tn|Q9R  
例如下所示： uP%;QBb  
Sample name:  EDF-C1-56 21)-:rS  
Merging data from file EDF-C1-56 0-0.txt J _[e9  
Finished merging RPC data for sample EDF-C1-56 6\S$I5  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt !lt\2Ae  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 (x@i,Ba@  
a. 创建一个新的散射库 #%=vy\r  
b. 散射模型命名 X'3`Q S:!  
c. 改变散射模型为“Tabulated BSDF”. dWq/)%@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 ） k_|v)\4B  
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。 P*"AtZuY]  
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， 1>*UbV<R;u  
g. 点击OK _sf0{/< )  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 ^%'tD
 
!Sy'Z6%f  
H
LyFyv\  
脚本代码： ;5JIY7t  
YVg}q#  
'#Language "WWB-COM" _QOOx+%*5  
9'/|?I  
Option Explicit
<*6y`X  
 >Wr   
Sub Main ja,L)b:  
.KwuhmR  
    'Cleanup #&`WMLl+8  
    ClearOutputWindow() a*n%SUP  
e2=,n6N]c  
    Print "Merging RPC Photonics BSDF Data Files" +<9q]
V  
    SetTextColor(255,0,0) (J;zkb
 
    Print "Note: Script should be located in the same folder as the BSDF TXT files." >!v,`O1  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." @)juP- o%  
    SetTextColor(0,0,0) HTtGpTsF  
(=3&8$  
    'Current directory of this script (should be the same as the text files being merged) "<n"A7e  
    Dim cDir As String C4SD  
    cDir = MacroDir$ & "\" b]qfcV  
V]S06>P  
    'Array which will be populated with the list of files to be merged ~bWWu`h  
    Dim fList() As String, curFile As String c:,{O0 #  
    GetFileList( cDir, fList ) @2Y]p.$q  
X#NeB>~  
    Print "" '14l )1g
.  
    Print "Files found for merging:" 8IIdNd  
    For Each curFile In fList H7XxME  
        Print Chr(9) & curFile &+w!'LSaD  
    Next *d,n2a#n5  
U%PMV?L{  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ?[4khQt  
    Dim nameArray() As String, sampName As String !
)*T  
    nameArray = Split(fList(0)," 0-0.txt") o)'=D(  
    sampName  = nameArray(0) n
Ka;FaJ  
    Print "" kc(b;EA  
    Print "Sample name: " & Chr(9) & sampName .2S
IU4[P  
]H9HO2wGQ  
    'Open an output file and write the FRED header data y7G|P~td  
    Dim outFile As String 6;c{~$s~[  
    outFile = cDir & sampName & "_FRED.txt" c$SxDYG  
    Open outFile For Output As #1 uKAHJ$%  
    Print #1, "type bsdf_data" xg1r 3  
    Print #1, "format angles=deg bsdf=value scale=1" r-"`Abev  
jw%FZ  
    'Loop the file list, skip the two header lines and write the remaining data to file Yw1q2jT  
    Dim lineArray() As String, curLine As Long {ZYCnS&?CL  
    For Each curFile In fList h|>n3-k|p  
        Print "Merging data from file " & curFile `3s-%>  
        ReadFile( cDir & curFile, lineArray ) Yiw^@T\H`  
        For curLine = 2 To UBound(lineArray) *l8vCa9Y  
            Print #1, lineArray(curLine) 5lA 8e  
        Next 6!=9V0G~  
    Next cFNtY~(b  
/<N
t$n  
    'Close the output file vlKKP

S  
    Close #1 ;8x^9Q  
Hx/Vm`pRyX  
    Print "Finished merging RPC data for sample " & sampName yaGVY*M0  
    Print "FRED formatted data file: " & Chr(9) & outFile e&7}N Za
 
End Sub &CsBG?@Z|  
`2~Ea_Z  
'Utility function to read the contents of a file into an array of strings. [0 f6uIF  
Function ReadFile(ByVal fileName As String, _ DG9;6"HBX  
                  ByRef lineArray() As String) As Long Q-%=ZW Z  
NP(?[W  
    ReadFile = -1 .4)P=*  
    Dim oFSO As Object pq5H{  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 2/gj@>dt  
    Erase lineArray ^?0,G>I
%-  
2%%U)|39mB  
    Dim fid As Long 2Rp{]s$jo  
    If oFSO.fileexists( fileName ) Then 8@#Y <{  
        fid = FreeFile() #IJKMSGw?E  
        Open fileName For Input As fid ng6p#F,3  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) Y##P9^zH1  
        Close fid -Af`AX  
    End If XD>@EYN<X  
    Set oFSO = Nothing
z4UQ:z@  
    Return UBound( lineArray ) ! yUKNR  
]lG\t'R
 
End Function AiI# "  
*Bz&  
Sub GetFileList( ByVal in_dir As String, _ @g2L=XF  
                 ByRef in_flist() As String ) 'V{
k$}P2  
7lOiFw  
    'Redimension the file list array 
4T^WRS  
    Erase in_flist P
@?'@.e  
kpUU'7Q  
    'Tracks how many files are found cO+`8`kv  
    Dim fCount As Long z,P7b]KVe  
    fCount = 0 wZb@VG}%  
PKG ,4v=  
    'Recurse directory and search for text files q &o=4  
    Dim f As String xfSvvCy  
    f = Dir$(in_dir & "*.txt") IbQ~f+y&2  
    While f <> "" nxRrmR}F  
        ReDim Preserve in_flist(fCount) &y?B&4|hM  
        in_flist(fCount) = f #-,`4x$m|  
        fCount += 1 73`UTXvWU  
        f = Dir$() kniMXeiu  
    Wend p7tC~]r:L  
    ReDim Preserve in_flist(fCount-1) ,DZLEsFM  
fs12<~+z  
End Sub #XPU$=  
FeMu`|2  
5q>u }J  
QQ：2987619807 sva$@y7b