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1. Why are the thermal detectors slower and less sensitive than the photon detectors? 2. What are...

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Physics

1. Why are the thermal detectors slower and less sensitive thanthe photon detectors?

2. What are the physical origins of the shot noise and Johnsonnoise in an optical detector?

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1 In comparison with photon detectors thermal detectors have been considerably less exploited in commercial and military systems The speed of thermal detectors is quite adequate for nonscanned images with twodimensional detectors In comparative studies more attention is paid to a wide family of photon detectors Progress in infrared IR detector technology is connected    See Answer
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