On-chip compensation of self-heating effects in microbolometer infrared detector arrays

Gu, Xiaokun; Karunasiri, Gamani; Jia, Yu; Chen, G.; Sridhar, U.; Zeng, Wenjiang

doi:10.1016/s0924-4247(98)00046-6

Cited by 16 publications

(5 citation statements)

References 4 publications

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“…The bias current should not be low enough such that it reduces the responsivity of the microbolometer [17]. A common compensation technique is to use a row of blind microbolometers that serves as a reference microbolometer [1,5,13,18]. A blind microbolometer is identical to a normal microbolometer but is not affected by incoming incident radiation; thus, it is only subjected to self-heating.…”

Section: Introductionmentioning

confidence: 99%

“…A Wheatstone bridge along with a differential amplifier reduces the Joule heating by suppressing the common mode signals [3]. Another self-heating compensation technique is to use a dummy microbolometer that has the same thermal mass as that of a normal microbolometer but has higher thermal conductivity and does not require infrared shielding [18,19]. The high thermal conductance of a dummy microbolometer detector reduces the thermal time constant to a very low value; thus, it can respond to selfheating immediately.…”

Section: Introductionmentioning

confidence: 99%

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Simulation and Analysis of Uncooled Microbolometer for Serial Readout Architecture

Alhussein

Haider

2016

Journal of Sensors

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A detailed thermal behavior and theoretical analysis of uncooled resistive microbolometer is presented along with the proposed thermal imager simulator. An accurate model of a thermal detector is required to design a readout circuit that can compensate for the noise due to process variability and self-heating. This paper presents a realistic simulation model of microbolometer that addresses the fixed pattern noise, Johnson noise, and self-heating. Different simulations were performed to study the impact of infrared power and bias power on the performance of microbolometers. The microbolometers were biased with different bias currents along with different thermal parameters of the reference microbolometer to analyze the impact of self-heating on the thermal image. The proposed thermal imager simulator is used as a tool to visually analyze the impact of noise on the quality of a thermal image. This simulator not only helps in compensating the noise prior to the implementation in Analog Design Environment, but also can be used as a platform to explore different readout architectures. In this work, serial readout architecture was simulated with a row of blind microbolometers that served as a reference. Moreover, the algorithm for the proposed thermal imager simulator is presented.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation and Analysis of Uncooled Microbolometer for Serial Readout Architecture

Alhussein

Haider

2016

Journal of Sensors

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“…AT=!-P-t (5) When the amplitude of the external signal I increases, the efficient thermal time t1 decreases. This mode is stable.…”

Section: Bias Heatihg Analysismentioning

confidence: 99%

“…Thermal processes in a bolometer generally are nonlinear, which makes their analysis difficult. In [3][4][5] for determination of heat parameters an approach of constancy of Joule power applicable when the change in the resistance of bolometer AR is much smaller than initial resistance R0 under ambient temperature is used. This requires the use of small signal which lowers the accuracy of determination of thermal parameters.…”

Section: Introductionmentioning

confidence: 99%

Determination of thermal parameters of microbolometers from electrical measurements

Chistokhin

Demjanenko

2005

SPIE Proceedings

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The analysis of dynamics of self-heating and electrical signals in pulse biased microbolometers, connected in different modes (constant voltage and constant current modes, and also Wheatstone bridge) is presented. Analytical expressions for determination of thermal parameters (thermal time constant, heat capacitance and thermal conductance) of thermoresistive microbolometers applicable under significant heating are derived. The experimental results are in good agreement with the theoretical analytical dependences.

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“…This can be done by maintaining a stable temperature with the combination of a heater and thermoelectric cooler or Peltier effect. Another possible approach is to perform compensation of self-heating at the read-out electronics level [37]. Chopping of radiation at doubled frame rate allows offset correction, but this leads to a decrease in detectivity.…”

Section: Micromachined Two-color Infrared Detectors With Thermal Chomentioning

confidence: 99%

GOALI: Systems Integration of Uncooled YBaCuO IR Detectors

Butler¹,

Çelik‐Butler²

2001

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Public Reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comment regarding this burden estimates or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and ABSTRACT (Maximum 200 words)Infrared imaging has demonstrated itself as a vital aspect of modern weapons systems. Infrared (IR) imaging has the potential to play an equally important role in commercial applications in medicine and transportation. Automobiles equipped with infrared imaging capabilities have been envisioned for the near future. This technology has the potential to tremendously improve personal safety by enabling good vision at night and under adverse weather conditions. Infrared imagers in automobiles may also be an enabling technology for "intelligent super-highways". However, IR imaging systems currently used by the military are too costly for consumer applications. This necessitates the development of inexpensive, uncooled infrared imaging systems that possess high detectivity for night vision applications. This research investigated the integration of semiconducting YBaCuO into micromachined thermal isolation structures to produce uncooled infrared detectors. Various detector structures were developed including a self-supporting structure where the 300 to 400-nm-thick thin film YBaCuO thermometer was held above the substrate by its electrode arms producing a detector with very low thermal mass (as low as 2.3 nJ/K) while maintaining an absorption of 30%. Also dual microcavity detectors were developed for to produce a relatively flat spectral reponse over a large optical bandwidth. 14. SUBJECT TERMS Dr. Leonov is a full-time Post-Doctoral Associate working on the project, under the sponsorship of Raytheon Systems Co. As this project is a GO ALI, substantial cost-sharing is provided by Raytheon. Dr. Leonov characterized the pyroelectric detector arrays supplied by the company for their responsivity, detectivity, noise, thermal conductance and electrical impedance. Correlation between noise and thermal properties was investigated. During the last phase, Dr. Leonov is going to play a substantial role in integration of the Raytheon Systems with the devices fabricated at Southern Methodist University (SMU). Graduate StudentName: Almasri, Mahmoud Worked for more than 160 Hours: Yes Contribution to Project: Mr. Almasri is Ph.D. student fully supportedby the NSF grant. During the past reporting period, he has designed, fabricated and tested different self-supporting, planar and mesa-style YBaCuO microbolometer stuctures. Since no bridge was used in these IR detectors, the thermal mass and therefore the thermal resp...

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On-chip compensation of self-heating effects in microbolometer infrared detector arrays

Cited by 16 publications

References 4 publications

Simulation and Analysis of Uncooled Microbolometer for Serial Readout Architecture

Simulation and Analysis of Uncooled Microbolometer for Serial Readout Architecture

Determination of thermal parameters of microbolometers from electrical measurements

GOALI: Systems Integration of Uncooled YBaCuO IR Detectors

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