RPC Photonics扩散片BSDF
摘要: A;h~Fx6s hse$M\5 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。 4B) prQ3 NO'-HKHj 背景: KX{ S8_ 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。 CYz]tv}g: 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。 t;
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图1. RPC Photonics工程漫射体结构及光束投射形状 CT/`Kg_ sI#K01;" @;pTQ
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I 步骤 =YI<L8@g~ I"r*p? 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。 p!173y,nL &ceZu=*
图2. RPC Photonics工程漫射体不同类型的散射数据 HuG|BjP 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) 1SQ&mH/ 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 [}.OlR3) 例如下所示: f.Jz]WXw,
Sample name: EDF-C1-56 ;|66AIwDe Merging data from file EDF-C1-56 0-0.txt w_6h
$"^x Finished merging RPC data for sample EDF-C1-56 e)O6k7U$ FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt ZVViu4]?y 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 9^XT,2Wwf a. 创建一个新的散射库 evq*&.6\ b. 散射模型命名 H;|^z@RB< c. 改变散射模型为“Tabulated BSDF”. +tl&Jjdm 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 ) fZ$8PMZv e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 wtaeF+u-R- f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, !DXKn\aQf g. 点击OK IX$ $pdQ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 *SLv$A ur"ckuG!9 YaDr6) 脚本代码: g?)9zJ9 v:eVK!O '#Language "WWB-COM" c)+IX;q-C PO1sVP.S Option Explicit t\S}eoc Y ~xcJH Sub Main u<:RSg u9_ Fjm}& 'Cleanup zN0^FXGD ClearOutputWindow() ',v
-&1R Kb#py6 Print "Merging RPC Photonics BSDF Data Files" >^{}Hjt SetTextColor(255,0,0) bR(rZu5 Print "Note: Script should be located in the same folder as the BSDF TXT files." fU8 &fo%ER Print "Note: Do not run this script multiple times without deleting the output file between executions." 5fjmr SetTextColor(0,0,0) Y 8EL +<(N]w* 'Current directory of this script (should be the same as the text files being merged) ^3^n|T7le Dim cDir As String [g`P(? cDir = MacroDir$ & "\" I5
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T32C=7 'Array which will be populated with the list of files to be merged @/g%l1$` Dim fList() As String, curFile As String amK"Z<V F GetFileList( cDir, fList ) $~75/ nZ0-
Kb Print "" ia?{]!7$ Print "Files found for merging:" <}&n}|! For Each curFile In fList _Y?p =; Print Chr(9) & curFile KC[ql}JP Next YAYPof~A$l T8bk \\Od 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 7jQOwzj Dim nameArray() As String, sampName As String IQAV`~_G nameArray = Split(fList(0)," 0-0.txt") [Abq("9p\ sampName = nameArray(0) .y\j .p Print "" @FKm_q Print "Sample name: " & Chr(9) & sampName ?%Hj,b mmE\=i~ 'Open an output file and write the FRED header data wM9HZraB< Dim outFile As String {N42z0c outFile = cDir & sampName & "_FRED.txt" W2?6f: Open outFile For Output As #1 D2z" Z@ Print #1, "type bsdf_data" 9)9p<(b$ Print #1, "format angles=deg bsdf=value scale=1" fkbHfBp[(A ;x^WPYEj 'Loop the file list, skip the two header lines and write the remaining data to file CoO.. Dim lineArray() As String, curLine As Long Z?ZiK1) K For Each curFile In fList bFD
vCF Print "Merging data from file " & curFile M=:!d$c
ReadFile( cDir & curFile, lineArray ) 0}tf*M+a For curLine = 2 To UBound(lineArray) lI~T>Lel2 Print #1, lineArray(curLine) +i HZ* Next WT;4J<O/ Next _IYd^c b&BkT%aA(G 'Close the output file t.Q}V5t{g Close #1 ur7sf$ 5tfD*j n Print "Finished merging RPC data for sample " & sampName s&&8~
)H Print "FRED formatted data file: " & Chr(9) & outFile V{4=,Ax End Sub {BPNb{dBKr B?n
6o|8 'Utility function to read the contents of a file into an array of strings. &.^(,pt Function ReadFile(ByVal fileName As String, _ ]z3!hgTj ByRef lineArray() As String) As Long *9Ta0e* r&!Ebe- ReadFile = -1 u-qwG/$E Dim oFSO As Object iXLODuI Set oFSO = CreateObject("Scripting.FileSystemObject") b* (~8JxZ Erase lineArray wzX(]BG }9=X*'BO Dim fid As Long NN>E1d= If oFSO.fileexists( fileName ) Then q9+`pj fid = FreeFile() } V * Open fileName For Input As fid QiO4fS'~W lineArray = Split(Input(LOF(fid), fid), vbCrLf) d ? Uj3G Close fid _C"=Hy{ End If eV(nexE Set oFSO = Nothing w8veh[%3n Return UBound( lineArray ) |z.x M> V Ioqn$ End Function w1;:B%!H J)o.@+Q} Sub GetFileList( ByVal in_dir As String, _ n0)0"S|y1 ByRef in_flist() As String ) _EHz>DJ9 fG dT2}gd 'Redimension the file list array ~V34j: Erase in_flist 0nOkQVMk> +|0f7RB+R 'Tracks how many files are found pzr\<U` Dim fCount As Long ~t=73fwB fCount = 0 n1XJuc~ 3 bK.8 'Recurse directory and search for text files bqPaXH
n Dim f As String Budo9z_w f = Dir$(in_dir & "*.txt") ce56$L8[ While f <> "" "kb[}r4? ReDim Preserve in_flist(fCount) uy'I#^Bt in_flist(fCount) = f t@(:S6d fCount += 1 OkNBP0e} f = Dir$() #!.26RM:P Wend 3bsuE^,.@ ReDim Preserve in_flist(fCount-1) \|@u)n_ ;15j\{r End Sub VsU*yG a 'v^Zterr ob.Br:x QQ:2987619807 Yq~$pVgf
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