By Vincent, John David
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9 Detector output with varying signal-to-noise ratios. 3) The units of NEP are watts. 5 × 10−13 W A variant uses the noise spectral density instead of the noise in the NEP formula. The resulting units are watts per root hertz (W∕Hz1∕2 ). If this parameter is used, it is especially important to display the units to help readers understand what you have done. 3) is convenient for predicting the minimum power a given system can detect, but it has some undesirable features. A good detector will have a small NEP, and detectors of different sizes and noise bandwidths will have different NEPs, so we cannot say in general what NEP a good detector should have unless we specify the area and noise bandwidth.
John David Vincent, Steven E. Hodges, John Vampola, Mark Stegall, and Greg Pierce. © 2016 John Wiley & Sons, Inc. Published 2016 by John Wiley & Sons, Inc. 1. 2. 3. 4. 5. 7. 1. 2. 3. 4. Evolution of Radiometric Nomenclature References 26 77 79 79 80 81 81 82 82 82 83 83 2 RADIOMETRY The word radiometry describes the detection and measurement of radiated electromagnetic energy, and is also used to describe the prediction and calculation of the power transferred by radiation from one object or surface to another.
The change in signal with time is referred to as modulation. 4. Electromagnetic radiation, including IR, involves sinusoidally varying electric fields. These fields are oriented perpendicular to the direction of travel, so any wave can be broken into two possible components. For example, if the wave is headed straight up, one component would include those whose electric fields were oriented east–west and the other would include the north–south fields. These two components are called the two polarizations.