By Antonio Rogalski
ISBN-10: 142007671X
ISBN-13: 9781420076714
Thoroughly revised and reorganized whereas protecting the approachable form of its predecessor, this moment version addresses the most recent advancements within the technology and expertise of IR detection. This version discusses the basics of IR detection, radiometry, and flux-transfer concerns wanted for IR detector and approach research in addition to significant achievements and developments within the improvement of IR detectors. It covers novel uncooled detectors, comparable to cantilever, antenna, and optically coupled detectors kind II superlattice detectors quantum dot IR detectors and THz arrays and third-generation detectors.
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22 2 Infrared Detector Characterization 2 Infrared Detector Characterization Infrared (IR) radiation itself was unknown until 2010 years ago when Herschel’s experiment with the thermometer was first reported. The first detector consisted of a liquid in a glass thermometer with a specially blackened bulb to absorb radiation. Herschel built a crude monochromator that used a thermometer as a detector so that he could measure the distribution of energy in sunlight. In April 1800 he wrote [1]: “Thermometer No.
At present, HgCdTe is the most widely used variable gap semiconductor for IR photodetectors. Over the years it has successfully fought off major challenges from extrinsic silicon and lead–tin telluride devices, but despite that it has more competitors today than ever before. These include Schottky barriers on silicon, SiGe heterojunctions, AlGaAs multiple QWs, GaInSb strain layer superlattices, high temperature superconductors, and especially two types of thermal detectors: pyroelectric detectors and silicon bolometers.
From Couture, M. , “Challenges in IR optics,” Proceedings of SPIE 4369, 649–61, 2001. 5 µm in IR region. Fused silica is characterized by very low thermal expansion coefficient that makes optical systems particularly useful in changing environmental conditions. 3 µm to 3 µm. 45), antireflection coatings are not needed. However, an antireflection coating is recommended to avoid ghost images. Fused silica is more expensive than BK-7, but still significantly cheaper than Ge, ZnS, and ZnSe and is a popular material for lenses of IR systems with bands located below 3 µm.
Infrared Detectors, by Antonio Rogalski
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