Analysis of 320X240 uncooled microbolometer focal plane array ...
Analysis of 320X240 uncooled microbolometer focal plane array ... Analysis of 320X240 uncooled microbolometer focal plane array ...
48The controller configuration was first used as a linear power supply TEC controller atInframetrics. With the use of the root locus plots and the circuit response simulation,modification was made to the resistor and the capacitor values of the controller circuit tooptimize it for the TEC pump model and the switching power supply circuit.The first three op-amps represent the controller, and the dependent voltage sourcein the circuit is placed after the controller to drive, in the place of switching powersupply, the TEC pump model circuit. The pulse source is placed in the feedback path tosimulate the TEC temperature fluctuation, and the pulse is fed to the negative terminal ofthe differential amplifier. The reference voltage is fed to the positive terminal.Root locus of the circuit was plotted to predict stability and response of the circuitusing Matlab. The following equations are the open loop transfer function of the eachamplifier stage of the controller. H 1(s), H2(s), and H3(s) refer to the differential amplifierstage, the second amplifier stage, and the third amplifier stage transfer functions,rrxcru.•ti ,tirxl-tx T1i rUfft.rartfial amplifier ninly Ilae a TIC train
49The third amplifier stage has the following characteristics:H3 (s)1— R10 R9 [((RI0C2 )S + 1DC gain: -201Pole: — = —1000R1 0C2(4.8)(4.9)The pole was place far to the right of the imaginary axis for fast response time.Multiplying all the DC gains, the circuit has an overall gain of 70 x -30 x -20 = 42000.The value of the gain was necessary for the small voltage (8011V) compensation and toensure the cancellation of the poles and zeros. The poles and zeros are plotted in Figure4.12 a) and b).Figure 4.12 a) shows the overall view of the pole-zero locations on the s-plane.The cancellation of the amplifier pole and zero with the circuit gain of 42000 can be seenin Figure 4.12 b). Figure 4.12 c) is the view of the root locus plot of the TEC pumpmodel. With the gain of the circuit, the pole and zero canceled each other out.
- Page 10 and 11: TABLE OF CONTENTSChapterPage1 INTRO
- Page 13 and 14: CHAPTER 1INTRODUCTIONIn recent year
- Page 17 and 18: 5radiation (LWIR) between 811m to 1
- Page 19 and 20: Figure 2.1 Simplified bolometer str
- Page 21 and 22: 9The first function of the right ha
- Page 23 and 24: 11corresponding to T 1 . With radia
- Page 25 and 26: 13then the transient term goes to z
- Page 27 and 28: 15The signal voltage (Eauation 2.26
- Page 29 and 30: 172.2.3 NoiseThe detection capabili
- Page 31 and 32: 19F is the f/# of the optics, VN is
- Page 33 and 34: 21To obtain the temperature fluctua
- Page 35 and 36: 23provide protection against detect
- Page 37 and 38: ZE1 L4t46LII C. 10 aft( IL.The UFPA
- Page 39 and 40: 27reflection (AR) coated Ge window
- Page 41 and 42: 29170 synchronization standard sign
- Page 43 and 44: 31amplified and integrated detector
- Page 45 and 46: 33processing module by a scan conve
- Page 47 and 48: Figure 3.3 UFPA camera platform.35
- Page 49 and 50: 37high mechanical strength as shown
- Page 51 and 52: Unlike the photon sensors, the micr
- Page 53 and 54: 414.2 The Controller DesignThe cont
- Page 55 and 56: 43performed at Inframetrics to dete
- Page 57 and 58: 45c) Heating of the TEC without hea
- Page 59: 47[(RiR2C1)s + — (R1 + R2) 4.1( )
- Page 63 and 64: t 1
- Page 65 and 66: 53c) T showing the response time of
- Page 67: REFERENCES1. R. A. Wood, "Uncooled
48The controller configuration was first used as a linear power supply TEC controller atInframetrics. With the use <strong>of</strong> the root locus plots and the circuit response simulation,modification was made to the resistor and the capacitor values <strong>of</strong> the controller circuit tooptimize it for the TEC pump model and the switching power supply circuit.The first three op-amps represent the controller, and the dependent voltage sourcein the circuit is placed after the controller to drive, in the place <strong>of</strong> switching powersupply, the TEC pump model circuit. The pulse source is placed in the feedback path tosimulate the TEC temperature fluctuation, and the pulse is fed to the negative terminal <strong>of</strong>the differential amplifier. The reference voltage is fed to the positive terminal.Root locus <strong>of</strong> the circuit was plotted to predict stability and response <strong>of</strong> the circuitusing Matlab. The following equations are the open loop transfer function <strong>of</strong> the eachamplifier stage <strong>of</strong> the controller. H 1(s), H2(s), and H3(s) refer to the differential amplifierstage, the second amplifier stage, and the third amplifier stage transfer functions,rrxcru.•ti ,tirxl-tx T1i rUfft.rartfial amplifier ninly Ilae a TIC train
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