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

More documents

Recommendations

Info

22conditioning electronics, timing and control logic, and on chip bias generation andmicrobolometer overheat protection circuitry.All of the 240 column detector signal path is connected to the signal conditioningnetwork located at the end of each column. The signal conditioning network iscomprised of a column differential amplifier, signal integrators, and a sample and holdnetwork. The signals coming out of the 320 sample and hold networks are shifted out tothe output driver by the output multiplexers. The U3000 is designed with an on-chip biasgeneration that generates all the necessary bias voltages to operate the UFPA. If the autobiasfunction is turned off, then the bias voltages are to be provided externally. Thehorizontal and vertical shift registers are used to control the FPA scanning. Also, end-oflineand end-of-frame Build-In Test (BIT) clocks, used by the sensor to verify normalUFPA operation, are generated by the shift registers. The BIT features are designed to
23provide protection against detector overheating in case of external clock failures and tofurnish the sensor with the UFPA status signals [10].The focal plane array consists of 320 x 240 microbolometer unit cells, which isformatted for 50% full TV resolution. A unit cell consists of a micro-bridge and readoutelectronics, which includes detector selection switch transistors, as shown in Figure 2.8.The microbridge structure is fabricated on top of the readout electronics. The firstgeneration of microbolometers, made by Honeywell, used a bipolar transistor for detectorselection switch in the readout circuits. The second generation microbolometer readoutcircuit, the U3000' s made by Rockwell, uses MOSFET for their selection switch.
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: 21To obtain the temperature fluctua
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

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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?