The present invention is generally related to fiber optic array signal processors, and more particularly to an improvement over linear array signal processor systems that interrogate Fabry-Perot sensors.
The linear array signal processor (LASP) system as seen in
The LASP system can be multiplexed with many channels sharing a single microprocessor, however, each channel must be interrogated in time by switching each channel on and off. With the existing system, any changes that occur to the environmental parameter associated with any channel while another channel is being interrogated is lost. When many channels are multiplexed in time with the existing system, the update rate per channel is slow. The present invention provides for a system that is able to process many channels simultaneously and overcomes the limitations of the existing system.
Objects and advantages together with the operation of the invention may be better understood by reference to the following detailed description taken in connection with the following illustrations, wherein:
While the present invention is described with reference to the preferred embodiment, it should be clear that the present invention should not be limited to this embodiment. Therefore, the description of the preferred embodiment herein is illustrative of the present invention and should not limit the scope of the invention as claimed.
Reference will now be made in detail to the preferred embodiment of the invention as illustrated in the accompanying drawings. The present invention discloses a method for multiplexing many fiber optic channels into one LASP signal conditioner.
Within the signal processor 30, the modulated light 31 from the sensor exits the fiber 32 as a cone shaped beam 34 and is redirected from the mirror 36 as a line with a Gaussian distribution. When the light passes through the Fizeau wedge cross correlator 38, a correlation burst as shown in
In order to determine the peak intensity given the characteristic Gaussian distribution, normalizing the readings based on the distribution resulting in a signal that looks like the signal shown in
As seen in
During calibration of the signal conditioner, the determination of the precise thickness of the wedge at each pixel along the CCD array is required. During the calibration of the sensor, calibration constants are entered into a file that are used to convert the gap into the appropriate engineering units, i.e., pressure or temperature. A calibration plot of sensor gap versus CCD pixel number is shown in
The method uses a two-dimensional (2-D) CCD array, e.g. 25 mm square, rather than the one-dimensional array used in the standard LASP described above. The 2-D array provides the capability to multiplex a large number of sensor signals from many fiber optic channels as shown in
A cylindrical lens 42 could be substituted for the cylindrical mirror 36 defined above (see
The polished fiber ends may be arranged in a variety of ways and held in a mounting block. In the preferred embodiment, sixty-four fibers are arranged side by side in two parallel V-blocks that are tilted at a slight angle as shown in
A Fizeau wedge 38, e.g. 25 mm square, changes thickness in one dimension only and covers the CCD array 40 as observed in the top view of
There is also a wavelength shift caused by chromatic dispersion through the wedge. It is necessary to correct for the chromatic dispersion in the signal processing algorithm.
The two-dimensional CCD array of the present invention permits multiplexing of a large number of sensor signals. This approach enables a significant increase in the update rate per channel compared to the standard LASP.
This application claims priority from U.S. Provisional Patent Application Ser. No. 60/637,959, filed Dec. 21, 2004.
Number | Name | Date | Kind |
---|---|---|---|
1432149 | Bellingham | Oct 1922 | A |
3923400 | Hardy | Dec 1975 | A |
4210029 | Porter | Jul 1980 | A |
4329058 | James et al. | May 1982 | A |
4393714 | Schmidt | Jul 1983 | A |
4418981 | Stowe | Dec 1983 | A |
4428239 | Johnston | Jan 1984 | A |
4572669 | James et al. | Feb 1986 | A |
4576479 | Downs | Mar 1986 | A |
4583228 | Brown et al. | Apr 1986 | A |
4596466 | Ulrich | Jun 1986 | A |
4606638 | Sommargren | Aug 1986 | A |
4628211 | Ruppert | Dec 1986 | A |
4640616 | Michalik | Feb 1987 | A |
4647203 | Jones et al. | Mar 1987 | A |
4648083 | Giallorenzi | Mar 1987 | A |
4668889 | Adams | May 1987 | A |
4678909 | Jackson et al. | Jul 1987 | A |
4729654 | Akuta | Mar 1988 | A |
4755668 | Davis et al. | Jul 1988 | A |
4772786 | Langdon | Sep 1988 | A |
4777358 | Nelson | Oct 1988 | A |
4787741 | Udd et al. | Nov 1988 | A |
4806016 | Corpron et al. | Feb 1989 | A |
4844616 | Kulkarni et al. | Jul 1989 | A |
4873989 | Einzig | Oct 1989 | A |
4907035 | Galburt et al. | Mar 1990 | A |
4914666 | Glance | Apr 1990 | A |
4968144 | Thomas et al. | Nov 1990 | A |
4972077 | Willson et al. | Nov 1990 | A |
4995697 | Adamovsky | Feb 1991 | A |
5034603 | Wilson | Jul 1991 | A |
5089696 | Turpin | Feb 1992 | A |
5094534 | Cole et al. | Mar 1992 | A |
5119024 | Popovic et al. | Jun 1992 | A |
5128537 | Halg | Jul 1992 | A |
5128798 | Bowen et al. | Jul 1992 | A |
5148604 | Bantien | Sep 1992 | A |
5177805 | Groger et al. | Jan 1993 | A |
5187546 | Johnston | Feb 1993 | A |
5202939 | Belleville et al. | Apr 1993 | A |
5202969 | Sato et al. | Apr 1993 | A |
5218418 | Layton | Jun 1993 | A |
5218426 | Hall et al. | Jun 1993 | A |
5225888 | Selwyn et al. | Jul 1993 | A |
5239400 | Liu | Aug 1993 | A |
5247597 | Blacha et al. | Sep 1993 | A |
5276501 | McClintock et al. | Jan 1994 | A |
5283625 | Bunn, Jr. | Feb 1994 | A |
5319981 | Mei et al. | Jun 1994 | A |
5351317 | Weber | Sep 1994 | A |
5361130 | Kersey et al. | Nov 1994 | A |
5386729 | Reed et al. | Feb 1995 | A |
5392117 | Belleville et al. | Feb 1995 | A |
5400140 | Johnston | Mar 1995 | A |
5401956 | Dunphy et al. | Mar 1995 | A |
5401958 | Berkcan | Mar 1995 | A |
5420688 | Farah | May 1995 | A |
5444724 | Goto | Aug 1995 | A |
5451772 | Narendran | Sep 1995 | A |
5471428 | Baroni et al. | Nov 1995 | A |
5477323 | Andrews et al. | Dec 1995 | A |
5497233 | Meyer | Mar 1996 | A |
5509023 | Glance et al. | Apr 1996 | A |
5526114 | Eselun | Jun 1996 | A |
5550373 | Cole et al. | Aug 1996 | A |
5557406 | Taylor et al. | Sep 1996 | A |
5559358 | Burns et al. | Sep 1996 | A |
5631736 | Thiel et al. | May 1997 | A |
5641956 | Vengsarkar et al. | Jun 1997 | A |
5646762 | Delavaux et al. | Jul 1997 | A |
5647030 | Jorgenson et al. | Jul 1997 | A |
5657405 | Fujiwara | Aug 1997 | A |
5682237 | Belk | Oct 1997 | A |
5760391 | Narendran | Jun 1998 | A |
5784507 | Holm-Kennedy et al. | Jul 1998 | A |
5796007 | Panagotopulos et al. | Aug 1998 | A |
5818586 | Lehto et al. | Oct 1998 | A |
5835214 | Cabib et al. | Nov 1998 | A |
5835645 | Jorgenson et al. | Nov 1998 | A |
5847828 | Downs | Dec 1998 | A |
5852498 | Youvan et al. | Dec 1998 | A |
5872628 | Erskine | Feb 1999 | A |
5889590 | Duggal et al. | Mar 1999 | A |
5891747 | Farah | Apr 1999 | A |
5910840 | Furstenau | Jun 1999 | A |
5923030 | Assard et al. | Jul 1999 | A |
5926591 | Labeye et al. | Jul 1999 | A |
5929990 | Hall et al. | Jul 1999 | A |
5949801 | Tayebati | Sep 1999 | A |
5986749 | Wu et al. | Nov 1999 | A |
5999261 | Pressesky et al. | Dec 1999 | A |
5999262 | Dobschal et al. | Dec 1999 | A |
6016702 | Maron | Jan 2000 | A |
6020963 | DiMarzio | Feb 2000 | A |
6057911 | Reich | May 2000 | A |
6064630 | Fersht et al. | May 2000 | A |
6069686 | Wang et al. | May 2000 | A |
6075613 | Schermer et al. | Jun 2000 | A |
6078706 | Nau et al. | Jun 2000 | A |
6088144 | Doerr | Jul 2000 | A |
6115521 | Tran et al. | Sep 2000 | A |
6118534 | Miller | Sep 2000 | A |
6122415 | Blake | Sep 2000 | A |
6137621 | Wu | Oct 2000 | A |
6151114 | Russell | Nov 2000 | A |
6157025 | Katagiri et al. | Dec 2000 | A |
6173091 | Reich | Jan 2001 | B1 |
6178001 | Kim | Jan 2001 | B1 |
6201289 | Jou | Mar 2001 | B1 |
6212306 | Cooper et al. | Apr 2001 | B1 |
6233262 | Mesh et al. | May 2001 | B1 |
6272926 | Fehrenbach et al. | Aug 2001 | B1 |
6281976 | Taylor et al. | Aug 2001 | B1 |
6282215 | Zorabedian et al. | Aug 2001 | B1 |
6289143 | Berthold et al. | Sep 2001 | B1 |
6304686 | Yamate et al. | Oct 2001 | B1 |
6328647 | Traudt | Dec 2001 | B1 |
6330255 | Hung | Dec 2001 | B1 |
6331892 | Green | Dec 2001 | B1 |
6396605 | Heflinger et al. | May 2002 | B1 |
6422084 | Fernald et al. | Jul 2002 | B1 |
6425290 | Willcox et al. | Jul 2002 | B2 |
6439055 | Maron et al. | Aug 2002 | B1 |
6469817 | Heflinger | Oct 2002 | B1 |
6486984 | Baney et al. | Nov 2002 | B1 |
6490038 | Jung et al. | Dec 2002 | B1 |
6492636 | Chen et al. | Dec 2002 | B1 |
6492800 | Woods et al. | Dec 2002 | B1 |
6496265 | Duncan et al. | Dec 2002 | B1 |
6501551 | Tearney et al. | Dec 2002 | B1 |
6522797 | Siems et al. | Feb 2003 | B1 |
6538748 | Tucker et al. | Mar 2003 | B1 |
6539136 | Dianov et al. | Mar 2003 | B1 |
6545760 | Froggatt et al. | Apr 2003 | B1 |
6552799 | Wright et al. | Apr 2003 | B1 |
6563986 | Davis et al. | May 2003 | B2 |
6581465 | Waters et al. | Jun 2003 | B1 |
6583882 | Scruggs et al. | Jun 2003 | B2 |
6594022 | Watterson et al. | Jul 2003 | B1 |
6597458 | Tayag et al. | Jul 2003 | B2 |
6603560 | Islam | Aug 2003 | B1 |
6608685 | Wood et al. | Aug 2003 | B2 |
6612174 | Sittler et al. | Sep 2003 | B2 |
6621258 | Davidson et al. | Sep 2003 | B2 |
6633593 | Ksendzov et al. | Oct 2003 | B2 |
6636321 | Bohnert | Oct 2003 | B2 |
6643025 | Degertekin et al. | Nov 2003 | B2 |
6647160 | Chi et al. | Nov 2003 | B1 |
6650420 | Houston et al. | Nov 2003 | B2 |
6668105 | Chen et al. | Dec 2003 | B2 |
6668111 | Tapalian et al. | Dec 2003 | B2 |
6668656 | Fernald et al. | Dec 2003 | B2 |
6680472 | Thingbø et al. | Jan 2004 | B1 |
6687011 | Lee et al. | Feb 2004 | B1 |
6687036 | Riza | Feb 2004 | B2 |
6690873 | Bendett et al. | Feb 2004 | B2 |
6714566 | Coldren et al. | Mar 2004 | B1 |
6714700 | Burger et al. | Mar 2004 | B2 |
6717965 | Hopkins, II et al. | Apr 2004 | B2 |
6735224 | Murry et al. | May 2004 | B2 |
6741357 | Wang et al. | May 2004 | B2 |
6747743 | Skinner et al. | Jun 2004 | B2 |
6765194 | Holz et al. | Jul 2004 | B2 |
6771905 | Bortz | Aug 2004 | B1 |
6776049 | Johnson et al. | Aug 2004 | B2 |
6785004 | Kersey et al. | Aug 2004 | B2 |
6791694 | Pezeshki | Sep 2004 | B2 |
6798940 | Lee et al. | Sep 2004 | B2 |
6806961 | Hill | Oct 2004 | B2 |
6820489 | Fernald et al. | Nov 2004 | B2 |
6822979 | Daiber | Nov 2004 | B2 |
6825934 | Baney et al. | Nov 2004 | B2 |
6829073 | Krol et al. | Dec 2004 | B1 |
6838660 | Duncan et al. | Jan 2005 | B2 |
6839131 | Kwon | Jan 2005 | B2 |
6842254 | Van Neste et al. | Jan 2005 | B2 |
6879421 | Clark et al. | Apr 2005 | B2 |
6882428 | Baney et al. | Apr 2005 | B2 |
6886365 | Rumpf et al. | May 2005 | B2 |
6886404 | Digonnet et al. | May 2005 | B2 |
6894787 | Youngner et al. | May 2005 | B2 |
6898339 | Shah et al. | May 2005 | B2 |
6900896 | Motamedi et al. | May 2005 | B2 |
6901088 | Li et al. | May 2005 | B2 |
6901176 | Balachandran et al. | May 2005 | B2 |
6904070 | Pontis et al. | Jun 2005 | B2 |
6909548 | Duggan | Jun 2005 | B2 |
6915048 | Kersey et al. | Jul 2005 | B2 |
6917736 | Ersoy | Jul 2005 | B1 |
6921894 | Swierkowski | Jul 2005 | B2 |
6925213 | Boyd et al. | Aug 2005 | B2 |
6940588 | Woodside et al. | Sep 2005 | B2 |
6947218 | Turner, III | Sep 2005 | B2 |
6955085 | Jones et al. | Oct 2005 | B2 |
6963404 | Chang | Nov 2005 | B2 |
6985235 | Bao et al. | Jan 2006 | B2 |
6989906 | Sandercock | Jan 2006 | B2 |
7002697 | Domash et al. | Feb 2006 | B2 |
7009691 | VanWiggeren et al. | Mar 2006 | B2 |
7016047 | May | Mar 2006 | B2 |
7019837 | Waagaard | Mar 2006 | B2 |
7043102 | Okamoto et al. | May 2006 | B2 |
7046349 | Everall et al. | May 2006 | B2 |
7047816 | Jones et al. | May 2006 | B2 |
7065108 | Park et al. | Jun 2006 | B2 |
7134346 | Lopushansky et al. | Nov 2006 | B2 |
7139081 | DeGroot | Nov 2006 | B2 |
7139295 | Tsai et al. | Nov 2006 | B2 |
7173713 | Xu et al. | Feb 2007 | B2 |
7230959 | Johnson | Jun 2007 | B2 |
7305158 | Jeffers et al. | Dec 2007 | B2 |
7355684 | Jeffers et al. | Apr 2008 | B2 |
7355726 | Jeffers et al. | Apr 2008 | B2 |
7405829 | Shen | Jul 2008 | B2 |
7423762 | Schmidt | Sep 2008 | B2 |
7434472 | Leitko et al. | Oct 2008 | B2 |
7492463 | Lopushansky et al. | Feb 2009 | B2 |
7511823 | Schultz et al. | Mar 2009 | B2 |
20010013934 | Varnham et al. | Aug 2001 | A1 |
20020015155 | Pechstedt et al. | Feb 2002 | A1 |
20020041722 | Johnson et al. | Apr 2002 | A1 |
20020109081 | Tarvin et al. | Aug 2002 | A1 |
20020167730 | Needham et al. | Nov 2002 | A1 |
20020186377 | Kuskovsky et al. | Dec 2002 | A1 |
20030020926 | Miron | Jan 2003 | A1 |
20030025912 | Hui et al. | Feb 2003 | A1 |
20030039428 | Okamoto et al. | Feb 2003 | A1 |
20030043697 | Vakoc | Mar 2003 | A1 |
20030081875 | Kochergin et al. | May 2003 | A1 |
20030128917 | Turpin et al. | Jul 2003 | A1 |
20030132375 | Blazo | Jul 2003 | A1 |
20030141440 | Kim et al. | Jul 2003 | A1 |
20030159518 | Sawatari et al. | Aug 2003 | A1 |
20030184867 | Clark | Oct 2003 | A1 |
20040008742 | Chou et al. | Jan 2004 | A1 |
20040013040 | Maas et al. | Jan 2004 | A1 |
20040013356 | Wang et al. | Jan 2004 | A1 |
20040113104 | Maida, Jr. | Jun 2004 | A1 |
20040141184 | Ueki | Jul 2004 | A1 |
20040151216 | Tsai et al. | Aug 2004 | A1 |
20040151438 | Ferguson | Aug 2004 | A1 |
20040196874 | Spiegelberg et al. | Oct 2004 | A1 |
20040202399 | Kochergin et al. | Oct 2004 | A1 |
20050046859 | Waagaard | Mar 2005 | A1 |
20050046862 | Melnyk | Mar 2005 | A1 |
20050073690 | Abbink et al. | Apr 2005 | A1 |
20050105098 | Johansen et al. | May 2005 | A1 |
20050213870 | Kersey et al. | Sep 2005 | A1 |
20050218299 | Olsen et al. | Oct 2005 | A1 |
20050231729 | Lopushansky et al. | Oct 2005 | A1 |
20050231730 | Jeffers et al. | Oct 2005 | A1 |
20050237538 | Belleville | Oct 2005 | A1 |
20050242096 | Jaghab | Nov 2005 | A1 |
20050244096 | Jeffers et al. | Nov 2005 | A1 |
20060034569 | Shih et al. | Feb 2006 | A1 |
20060139652 | Berthold | Jun 2006 | A1 |
20060146337 | Hartog | Jul 2006 | A1 |
20060152733 | Waagaard | Jul 2006 | A1 |
20060241889 | Lopushansky et al. | Oct 2006 | A1 |
20060274323 | Gibler et al. | Dec 2006 | A1 |
20070006663 | Zerwekh et al. | Jan 2007 | A1 |
20070064241 | Needham | Mar 2007 | A1 |
20070227252 | Leitko et al. | Oct 2007 | A1 |
20070252998 | Berthold et al. | Nov 2007 | A1 |
20080043245 | Needham | Feb 2008 | A1 |
20080174781 | Berthold et al. | Jul 2008 | A1 |
20080186506 | Lopushansky | Aug 2008 | A1 |
20080297808 | Riza et al. | Dec 2008 | A1 |
20090056447 | Berthold et al. | Mar 2009 | A1 |
Number | Date | Country |
---|---|---|
3127333 | Jan 1983 | DE |
3411096 | Jun 1983 | DE |
0397388 | Nov 1990 | EP |
0400939 | Dec 1990 | EP |
0452993 | Oct 1991 | EP |
0549166 | Jun 1993 | EP |
0571107 | Nov 1993 | EP |
0957345 | Nov 1999 | EP |
1586854 | Oct 2005 | EP |
1168971 | Oct 1969 | GB |
Number | Date | Country | |
---|---|---|---|
20060241889 A1 | Oct 2006 | US |
Number | Date | Country | |
---|---|---|---|
60637959 | Dec 2004 | US |