【正文】 Rajan et al. 20xx). Surface plasmons are TM polarized electromagic excitations at the boundary between the metal and a dielectric with their ?eld decaying exponentially both in the metal as well as in the dielectric medium. In SPR based sensors, Kretschmann’ s con?guration is widely used to excite surface plasmons using evanescent ?eld of a ppolarized light. Since the light guidance in an optical ?ber occurs due to the phenomenon of total internal re?ection, the generation of the evanescent ?eld at the corecladding interface is used to excite surface plasmon waves. To fabricate a SPR based ?ber optic sensor, cladding is removed from a small portion of the ?ber and the unclad core is coated with a thin layer of metal such as silver or gold. The sensing sample is placed in contact with the metal layer. The surface plasmons are excited at the metal and sensing medium interface by the evanescent ?eld of the light guided in the ?ber when the wave vectors of the surface plasmon wave and the evanescent wave are equal. There are two schemes for their excitation, one is keeping the wavelength ?xed and changing the angle of incidence (angular interrogation) and the other is changing the wavelength of light and keeping the angle of incidence ?xed (wavelength interrogation). In the SPR based ?ber optic sensors wavelength interrogation is generally used and the resonance occurs at a particular wavelength of light. The resonance wavelength depends on the 36 refractive index of the sensing Medium. Probe miniaturization, pact device and low cost are some of the most essentia requirements of a sensing device in addition to higher values of performance parameters Surface plasmons in conjunction with optical ?ber have attained the goal of miniaturization of the probe to a very good extent. To enhance the sensitivity of the sensor various techniques/probes have been devised. Few of these are use of bimetallic layers (Sharma and Gupta 20xx), dual and tetra tapered ?ber SPR probes (Kim et al 20xx), tapered ?ber optic SPR micro sensor (Grunwald and Holst 20xx), single mode tapered ?ber sensor with symmetric (Villatoro et al. 20xx) and asymmetric (Diez et al 20xx) metallic coatings, dopant introduction (Sharma et al. 20xx), uniform tapered SPR region sandwiched between two identical tapers (Verma et al. 20xx) and Ushaped probe (Verma and Gupta 20xx). In SPR based ?ber optic sensors, collimated beam from a polychromatic source is focused at the end face of the ?ber using suitable optics. Such kind of light source along with optics is bulky and is not cost effective. For mercial purposes it does not seem to be a suitable candidate for sensing. The sensing device can be made pact with an added advantage of low cost if the light emitting diode (LED) is used as a source. Dual LED based intensity modulated ?ber optic SPR sensor has been recently reported (Hideki et al. 20xx). As is known intensity modulated sensors show poor sensitivity as pared to that of spectral interrogation. Further, any ?uctuation in the intensity of the light source due to electrical power ?uctuation may affect the measurements. In another study on SPR sensor, polychromatic LED has been used with metal coated prism as a probe (Slavik et al. 20xx). This device is bulky and is also not miniaturized. Further, it。 Rajan et al. 20xx。 Mitsushio et al. 20xx。 Jenson and Yee 1993。 Sensor Optical ?ber B. D. Gupta LED based ? ber optic surface plasmon resonance sensor Received: 22 December 20xx / Accepted: 21 September 20xx / Published online: 8 October 20xx 169。HEE If = False Then = True End If = shuju For L = 0 To 3 = ZMDZ Else GoTo Loop2 End If Put 5, , ZMDZ End If 31 Next LoopHZDZ Close 2 32 附錄 二 系統(tǒng)整體電路圖 123P T 19 21C116R 2A1KV C C3V 33 P1.72P0.01P1.54P1.63VSS5P2.16P2.07P1.48P0.713P0.614VDD15P1.210P1.39P0.516P0.417P0.318P0.219P0.120P1.012P1.111P89LPC922U1 GND8IN77IN66IN55IN44IN33IN22IN1115OUT114OUT213OUT312OUT411OUT510OUT69OUT716COMULN2003 GND8IN77IN66IN55IN44IN33IN22IN1115OUT114OUT213OUT312OUT411OUT510OUT69OUT716COMULN2003 3QAQB45QC6QD10QE11QF12QG13QHC L R9C L K8A1B2U3S N 7 4 H C 1 6 43QAQB45QC6QD10QE11QF12QG13QHC L R9C L K8A1B2U5S N 7 4 H C 1 6 43QAQB45QC6QD10QE11QF12QG13QHC L R9C L K8A1B2U6S N 7 4 H C 1 6 43QAQB45QC6QD10QE11QF12QG13QHC L R9C L K8A1B2U2S N 7 4 H C 1 6 43QAQB45QC6QD10QE11QF12QG13QHC L R9C L K8A1B2U4S N 7 4 H C 1 6 412X40LED C R Y S T A L3VG N D3V1 164 K 7 AR1G N DS1K E Y 圖 D1 34 附錄三 英文原文 本文出自網(wǎng)站： Sarika Singh HP1 NN = CStr(P(2)) amp。HA1 rec = M1 * 94 + M2 LOCATION = CLng(rec) * 24 + 1 Open HZK12 For Binary Access Read As 1 Get 1, LOCATION, HZDZ Close 1 29 上位機提取字符的點陣數(shù)據(jù)的程序及發(fā)送程序 TempFile = Open TempFile For Binary Access Write As 2 shuju = amp。 } } } 28 提取漢字點陣