[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： !7Eodq-0  
Z<^;Ybw{`Z  
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。 J3`0i@  
])}a^]0q  
背景： 3xT9/8*  
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。 28k=@k^q  
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。 t0+i]lr  
_f'v>"K  
>H^#!eaqw  
],_+J*  
步骤 c/Xg ARCO  
nl qn:[BU  
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。 ,DZvBS  
-Arsmo  
M?!@L:b[  
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） h%:rJ_#Zl  
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 2 /FQ;<L  
例如下所示： GlnO8cAB  
Sample name:  EDF-C1-56 TP"cEfs x  
Merging data from file EDF-C1-56 0-0.txt @^A
5{qQ\  
Finished merging RPC data for sample EDF-C1-56 oQ 2$z8  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt C,An\lsT  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 K#YQB3rX  
a. 创建一个新的散射库 F}5d>nw  
b. 散射模型命名 n:,mo}?X  
c. 改变散射模型为“Tabulated BSDF”. _p^"l2%D/  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） l
j (y  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 xSm;~')
g  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， .!x&d4;,q  
g. 点击OK Nob(D'vSr  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 Ho>Np&  
Mf1(4F  
rZ~w_DK*  
脚本代码： "f,{d}u  
p+;& Gg54  
'#Language "WWB-COM" w G%W{T$  
,%
M[$S'  
Option Explicit J
sz!ro  
5~L]zE  
Sub Main JZ:@iI5>+  
ffZ~r%25{  
    'Cleanup .T| }rB<c  
    ClearOutputWindow() S/nPK,^d2  
+$
h  
    Print "Merging RPC Photonics BSDF Data Files" ^"WVE["  
    SetTextColor(255,0,0) @^P^-B  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." qt@L&v}~j  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." tyu@aCK  
    SetTextColor(0,0,0) EB~]6.1  
=V^-@ji)b  
    'Current directory of this script (should be the same as the text files being merged) t|aV:x  
    Dim cDir As String 6b2UPI7m~  
    cDir = MacroDir$ & "\" 0j.K?]f)h  
A,}M ^$@  
    'Array which will be populated with the list of files to be merged ^*K=wE}AG  
    Dim fList() As String, curFile As String 0MG>77  
    GetFileList( cDir, fList ) at: li  
;cor\R  
    Print "" Ql*zl  
    Print "Files found for merging:" bSB%hFp=Cp  
    For Each curFile In fList Gt w>R  
        Print Chr(9) & curFile Nk|cU;?+  
    Next #36QO  
%TB(E<p`  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. p_FM 2K7!  
    Dim nameArray() As String, sampName As String 2hh8G5IaQ  
    nameArray = Split(fList(0)," 0-0.txt") i5,iJe0cA  
    sampName  = nameArray(0) swKkY`g  
    Print "" v}B%:1P4  
    Print "Sample name: " & Chr(9) & sampName /jbAf]"F;  
:^;c(>u{  
    'Open an output file and write the FRED header data ~+q1g[6  
    Dim outFile As String s|[>@~gXk  
    outFile = cDir & sampName & "_FRED.txt" *@U{[J  
    Open outFile For Output As #1 LQ+/|_(.  
    Print #1, "type bsdf_data" [
$N_YcN?  
    Print #1, "format angles=deg bsdf=value scale=1" JF~i.+{h  
5!-TLwl`j\  
    'Loop the file list, skip the two header lines and write the remaining data to file >ohH4:  
    Dim lineArray() As String, curLine As Long +-9vrEB  
    For Each curFile In fList &quY^j  
        Print "Merging data from file " & curFile 0[;2dc  
        ReadFile( cDir & curFile, lineArray ) .sMs_ 5D  
        For curLine = 2 To UBound(lineArray) sD|l}f  
            Print #1, lineArray(curLine) &|yLTx  
        Next \Mf>X\}  
    Next ! 'zd(kv<  
d2\!tJm  
    'Close the output file Z!p\=M,%  
    Close #1 (In{GA7;  
!avol/*  
    Print "Finished merging RPC data for sample " & sampName }gp@0ri%5  
    Print "FRED formatted data file: " & Chr(9) & outFile '&>"`q  
End Sub H]TdW;ZbZ  
Na\ZV|;*tu  
'Utility function to read the contents of a file into an array of strings. ]#/nn),Z  
Function ReadFile(ByVal fileName As String, _ FD=% 4#|  
                  ByRef lineArray() As String) As Long 3%WB?kc  
^r}c&@  
    ReadFile = -1 2TK \pfD  
    Dim oFSO As Object ycA<l"  
    Set oFSO = CreateObject("Scripting.FileSystemObject") W.wPy@yi  
    Erase lineArray TnW`#.f  
h~dQ5%  
    Dim fid As Long MK< y$B{}  
    If oFSO.fileexists( fileName ) Then #2R
z=QI  
        fid = FreeFile() >XN[KPTa  
        Open fileName For Input As fid ?hoOSur+  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) Q*M#e  
        Close fid kHM Jh~  
    End If \!KE_7HRu  
    Set oFSO = Nothing ns[/M~_r  
    Return UBound( lineArray ) 7?lz$.*Avp  
ct+F\:e  
End Function iFIGJS  
)\wkVAm  
Sub GetFileList( ByVal in_dir As String, _ srS!X$cec  
                 ByRef in_flist() As String ) $<*) 5|6  
UB~K/r`.|
 
    'Redimension the file list array HcRw9,I'  
    Erase in_flist "O$bq::(]e  
HG"ZN)~  
    'Tracks how many files are found *tjaac;z<J  
    Dim fCount As Long aZZ0eH  
    fCount = 0 xU'z>y4V$  
Ir;JYY!0?  
    'Recurse directory and search for text files *F$@!ByV  
    Dim f As String Lf_Y4a#  
    f = Dir$(in_dir & "*.txt") 5Fydh0.  
    While f <> "" txEN7!  
        ReDim Preserve in_flist(fCount) eP~bl   
        in_flist(fCount) = f *QK) 1Y1W  
        fCount += 1 e;i 6C%DB  
        f = Dir$() (bm^R-SbB  
    Wend &5 7c!)  
    ReDim Preserve in_flist(fCount-1) b'wy{~l@  
.!1[I{KU  
End Sub av'D
yNW\  
f )Lc
s  
[G 9Pb)  
QQ：2987619807 ):N#X<b':