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

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162.5 3Figure 2.4 UFPA responsivity for 300K irradiance in the 8 to 13,um [5].Figure 2.5 Typical microbolometer values for U3000 microbolometer array [5].
172.2.3 NoiseThe detection capability of any imaging system is limited by fluctuations of a randomnature, noise. There are three categories that the noise appearing in an infrared systemmay arise from: noise in detectors, in readout electronics, and from the radiationbackground. In a microbolometer UFPA, there are three primary noise sources to beconsidered. The Johnson noise of the bolometer, the 1/f noise characteristic of bothamorphous and poly-crystalline semiconductors, and the fundamental thermodynamictemperature fluctuation noise of the individual detector elements. Also, there are noisefrom the readout electronics and the detector bias supply, but the common-mode noiserejection features that are incorporated into Rockwell's design of UFPA effectivelysuppresses the noises.The Johnson noise or thermal noise appears in any resistive material. It is causedby the random motions of the charge carriers. 1/f noise or current noise is a dominantnoise source of semiconductor materials at low frequencies. The background noise is dueto the quasi-random arrival of photons from the surrounding of the detector. Thebackground noise ultimately limits the performance of any thermal detector, because thenoise from the background still exists even if all of the other noise is suppressed. Due tostatistical nature of the heat interchange with the surrounding, a thermal detector incontact with its environment by conduction and radiation exhibits random fluctuations inits temperature, known as temperature fluctuation noise. The temperature fluctuationnoise not only comes from the source background, but also from detector casing,electronics, and even the detector itself.
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: 15The signal voltage (Eauation 2.26
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 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

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