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Rotating prism-pair scanning is a conventional method used to achieve large angles with a straight-line configuration. A disadvantage of prism scanners for line scanning is that the sinusoidal scan produces a non-linear image. We use a laser-diode encoding technique to carry out real-time image linearization in a rotating prism-pair scanning system. In this study, we report on the results obtained in a thermal image system.

In this work, the 30 stacked InAs/GaAs quantum dot infrared photodetector (QDIP) structure was grown by solid-source molecular beam epitaxy technique and demonstrated with dual-band mid- (2.7~5.6μm) and long- (7.5~13.5μm) wavelength normal-incident detections without grating and passivated process for 256×256 FPA. The 256 ×256 QDIP FPA hybridized with snapshot-mode ROIC was mounted in a 68 pin leadless ceramic chip carrier which was put in the testing dewar with IR optical cold spectral filters of the 2.9~5.5μm and 6.5~14.5 μm for the dual-band IR detections, respectively. The testing scheme for thermal imaging uniformity of the InAs/GaAs QDIP focal plane array (FPA) has been proposed and calibrated using a plane-typed blackbody source of a high temperature of 373±1K and lower ambient temperature for the two-point temperature correction. The averaged of specific detectivity (D*) and operability of the QDIP FPA have reached 1.5×10 10 cm-Hz 1/2 /W and 99% at 80K, respectively. The dominant noise equivalent temperature differences (NEDT) of typical figure of merit for QDIP thermal imaging module operated under the temperature of 80K, device biases of -0.7 V and integration time of 32ms with infrared optics and two-point temperature correction (T L =R.T. and T H = 200 °C) are 1.065 K (mid-wavelength IR) and 131mK (long-wavelength IR), respectively. Meanwhile, it is worth to note that these are the first confirmation for dual-band detections of FPA from direct InAs quantum dots matrix embedded in GaAs heterostructure. In the future, the dual-band IR QDIP FPA will become one of the important candidates for hyper-spectral detection and thermal imaging fusion application.

In this work, a new improved FEM approach is described for analyzing strain distributions, computing electronic structure, and simulating the optical property of InAs/GaAs self-assembled quantum dot. A window-based software FEMLAB has been employed for multiphysics simulation. This approach can be used as a guideline for fast quantum-dot device structure design, especially in quantum dot lasers and quantum dot infrared photodetectors. Furthermore, the proposed approach and model could be used to develop three-dimensional nano-device simulator with further specific device module.

This paper presents the design and performance of Chung Shan Institute of Science and Technology newest man-portable infrared imaging system, the Seagle-1. The thermal imager is designed for day and night long-range observation and forward reconnaissance and surveillance applications. The camera system achieves an NETD equals 0.067 K at 30 Hz frame rate with f/1.8 optics (300 K background). The design and performance of the 256 X 244 PtSi infrared camera will be described in this paper.© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

The importance of the thermal image system increases rapidly. Uncooled thermal imagers offer the advantages of room temperature operation, light weight, small size, low power requirements, simplified logistics and increased reliability. In this work, we propose a relatively simple procedure which can reasonably write specifications and design systems with higher speed. The first order design is coped with system performance models and PC based scientific spreadsheet, a mathematical software package constructs to provide a cost-effective, compliant solution to a design problem. An illustrative example is presented to show the details.