Design and control of a thermal stabilizing system for a MEMS optomechanical uncooled infrared imaging camera

Design and control of a thermal stabilizing system for a MEMS optomechanical uncooled infrared imaging camera. Choi, J., Yamaguchi, J., Morales, S., Horowitz, R., Zhao, Y., & Majumdar, A. Sensors and Actuators A: Physical, 104:132-142, April 15, 2003, 2003.

Paper abstract bibtex

In this paper, the design and control of a thermal stabilizing system for an optomechanical uncooled infrared (IR) imaging camera is presented, which uses an array of MEMS bimaterial cantilever beams to sense an IR image source. A one-dimensional lumped parameter model of the thermal stabilization system was derived and experimentally validated. A model-based discrete time linear quadratic gaussian regulator (LQGR) control scheme, with a stochastic ambient noise model, was implemented. The control system incorporates a reference model, which generates desired reference temperature trajectory, and integral action to respectively diminish overshoots and achieve zero steady state error in closed loop. Simulation results show that the designed LQGR is able to enhance ambient temperature low frequency disturbance attenuation by more than 50 dB. The control system is able to regulate the focal-plane array (FPA) temperature with a standard deviation of about 100 μK, in spite of the fact that the temperature measurement noise has a standard deviation of 1 mK. Noise analysis results for the present stage of the optomechanical IR imaging system are summarized. The noise equivalent temperature difference (NETD) of the current stage of the IR camera system can achieve about 200 mK.

@article {695,
	title = {Design and control of a thermal stabilizing system for a MEMS optomechanical uncooled infrared imaging camera},
	journal = {Sensors and Actuators A: Physical},
	volume = {104},
	year = {2003},
	month = {April 15, 2003},
	pages = {132-142},
	abstract = {<p>In this paper, the design and control of a thermal stabilizing system for an optomechanical uncooled infrared (IR) imaging camera is presented, which uses an array of MEMS bimaterial cantilever beams to sense an IR image source. A one-dimensional lumped parameter model of the thermal stabilization system was derived and experimentally validated. A model-based discrete time linear quadratic gaussian regulator (LQGR) control scheme, with a stochastic ambient noise model, was implemented. The control system incorporates a reference model, which generates desired reference temperature trajectory, and integral action to respectively diminish overshoots and achieve zero steady state error in closed loop. Simulation results show that the designed LQGR is able to enhance ambient temperature low frequency disturbance attenuation by more than 50 dB. The control system is able to regulate the focal-plane array (FPA) temperature with a standard deviation of about 100 μK, in spite of the fact that the temperature measurement noise has a standard deviation of 1 mK. Noise analysis results for the present stage of the optomechanical IR imaging system are summarized. The noise equivalent temperature difference (NETD) of the current stage of the IR camera system can achieve about 200 mK.</p>
},
	keywords = {Infrared image detectors, LQGR control, MEMS IR sensors, NETD, Stochastic modeling, Temperature control},
	isbn = {0924-4247},
	url = {http://www.sciencedirect.com/science/article/pii/S0924424703000049},
	author = {Choi, Jongeun and Yamaguchi, Joji and Morales, Simon and Horowitz, Roberto and Zhao, Yang and Majumdar, Arunava}
}

Downloads: 0