Analysis of 320X240 uncooled microbolometer focal plane array ...

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40case of microbolometer array, it will be most likely to be activated as a cooler due to heatbuildup inside the array packaging during the process of imaging.Figure 4.4 Inside of a UFPA packaging [81As shown in Figure 4.4, a thermoelectric cooler is placed underneath themicrobolometer UFPA within the packaging. It will pump the heat from the inside of thepackage to the outside through back side conduction, which is attached to a heat sink.
414.2 The Controller DesignThe controller is design to stabilize the temperature inside the vacuum array packaging tobe at a constant temperature. A constant voltage is applied to the controller as a referencevoltage that will determine the desired temperature inside the UFPA packaging. Figure4.5 shows the block diagram of the controller loop. The output of the controller isconnected to the pulse width modulator (PMW) of the switching power supply. Thethermoelectric cooler is driven by the switching power supply to reduce the input powerof the circuit.Figure 4.5 A block diagram of the thermoelectric controller loop.The output power of the switching power supply is control by the pulse widthmodulator. The PWM produces pulses with frequency of around 20 KHz. The input tothe PWM is from -5V to +5V , and the width of the pulses are determined by the inputvoltage. If the input voltage increases, the pulse width decreases and vice versa. The
Page 1 and 2: Copyright Warning & RestrictionsThe
Page 3 and 4: ABSTRACTANALYSIS OF 320X240 UNCOOLE
Page 6 and 7: APPROVAL PAGEANALYSIS OF 320X240 UN
Page 8 and 9: This thesis is dedicated tomy famil
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: Unlike the photon sensors, the micr
Page 55 and 56: 43performed at Inframetrics to dete
Page 57 and 58: 45c) Heating of the TEC without hea
Page 59 and 60: 47[(RiR2C1)s + — (R1 + R2) 4.1( )
Page 61 and 62: 49The third amplifier stage has the
Page 63 and 64: t 1
Page 65 and 66: 53c) T showing the response time of
Page 67: REFERENCES1. R. A. Wood, "Uncooled

Analysis of 320X240 uncooled microbolometer focal plane array ...

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