Development of long-wavelength infrared detector and its space-based application requirements
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Abstract:
Infrared detection technology has greatly expanded the ability of mankind to study the earth and the universe. In recent years, the demand for long-wavelength infrared detectors is increasing for their advantages in exploring the earth and the universe. A variety of long-wavelength infrared detectors have been made based on thermal resistive effect, photoelectric effect, etc., in the past few decades. Remarkable achievements have been made in infrared materials, device fabrication, readout circuit, and device package. However, high performance long-wavelength infrared detectors, especially those for large format long-wavelength infrared detector focus plane array, are still unsatisfactory. Low noise, high detectivity, and large format long-wavelength infrared detector is necessary to satisfy space-based application requirements.Keywords:
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The compact infrared camera (CIRC) is one of technology demonstration payloads of Small Demonstration-Satellite type-3 (SDS-3). The CIRC is an infrared camera equipped with an uncooled infrared array detector (microbolometer). Microbolometers have an advantage of no requirement of cooling mechanisms such as a mechanical cooler. The main mission of the CIRC is the technology demonstration of the wildfire detection using the microbolometer. In this paper, we show the details of the design and concept of the CIRC. We also show preliminary results of feasibility study of the wildfire detection and other applications using thermal infrared images.
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In this study, visible on the far-infrared emissivity of knitted fabric, its rate of change of far infrared radiation were observed. In this study, light exposure time for 20,40,60 minutes, the experimental results, the longer the kind of light source distribution is much higher surface temperature will be relatively higher rate of infrared radiation, when the light source when the suspension began measuring data, the light source, the far infrared radiation rate of about 0.941 ~ 0.975 when reached will begin to flatten, after 15 minutes returned to its emission rate of about 0.937, when the far-infrared light irradiation of polyester fabrics through the far infrared radiation values are effectively increase, so the light irradiation intensity of far infrared radiation rate of the subjects were characterized by light and the length of time to improve the fabric surface temperature change and this temperature rise is the key to the experiment
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The infrared detector is the kernel of an infrared thermal imager. Usually it is the most expensive device. This paper describes a new infrared thermal design, based on an uncooled infrared detector with high performance and low price. It describes the specifications of the infrared detector and illustrates detailed the circuit to driver the infrared detector, include pivotal functions like TEC control and bias-voltages generation. The software to obtain image, correct non-uniformity and enhancement image is discussed also. At last, some infrared images prove the correctness of this design.
Infrared detector
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