1D InGaAs lock-in FPA

Kangzhu Guo; Haijiang Ou; Thomas Grycewicz; Abhay Joshi; Xinde Wang; Gordon Thomas; Haimin Wang; Richard Greene; Durga Misra; Sheng Liu; Zhiwei Liu; Jianjun Zhen; Xiaodong Wang; Baoqing Li; Zhixiong Xiao; Nicholas A. Ciampa; Jan Opyrchal; Halina Opyrchal; Ken K. Chin

doi:10.1117/12.542662

30 August 2004 1D InGaAs lock-in FPA

Kangzhu Guo, Haijiang Ou, Thomas Grycewicz, Abhay Joshi, Xinde Wang, Gordon Thomas, Haimin Wang, Richard Greene, Durga Misra, Sheng Liu, Zhiwei Liu, Jianjun Zhen, Xiaodong Wang, Baoqing Li, Zhixiong Xiao, Nicholas A. Ciampa, Jan Opyrchal, Halina Opyrchal, Ken K. Chin

Author Affiliations +

Proceedings Volume 5406, Infrared Technology and Applications XXX; (2004) https://doi.org/10.1117/12.542662
Event: Defense and Security, 2004, Orlando, Florida, United States

Abstract

A 1D IR lock-in focal plane array (FPA) for extremely weak signal imaging has been demonstrated. The experimental system consists of an object with modulated image signal, a high speed InGaAs linear photodetector array as receiver, a CMOS lock-in linear array read-out circuit, and a focal plane array test system. The system can detect extremely weak signals immersed in strong background. Preliminary test shows that under room temperature each of the pixels in the 1D lock-in FPA can read out modulated signal 5 orders smaller than the background. The InGaAs detector array response is from 0.8 μm to 1.6 μm (peak at 1.2 μm). The lock-in array read-out circuit uses a correlated multi-cycle integrator, which can operate in several modes such as gated integration, and phase-sensitive integration with background subtraction. The 1D lock-in FPA works as a pixel to pixel lock-in amplifier, wherein very small signals may be extracted from a much strong background if the frequency of the illuminating source (usually IR light sources) is known. Simulation results are also reported. Experimental results based on an IR illuminating source are demonstrated.

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Kangzhu Guo, Haijiang Ou, Thomas Grycewicz, Abhay Joshi, Xinde Wang, Gordon Thomas, Haimin Wang, Richard Greene, Durga Misra, Sheng Liu, Zhiwei Liu, Jianjun Zhen, Xiaodong Wang, Baoqing Li, Zhixiong Xiao, Nicholas A. Ciampa, Jan Opyrchal, Halina Opyrchal, and Ken K. Chin "1D InGaAs lock-in FPA", Proc. SPIE 5406, Infrared Technology and Applications XXX, (30 August 2004); https://doi.org/10.1117/12.542662

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