Before detection can occur, the optical signal must be quantified. Boyd emphasizes that radiometry deals with energy transfer, distinct from photometry (which is weighted by the human eye response).
| Quantity | Symbol | Description | SI Unit | | :--- | :---: | :--- | :--- | | | $Q$ | Total energy emitted or received. | Joules (J) | | Radiant Flux (Power) | $\Phi$ | Energy per unit time. | Watts (W) | | Radiant Intensity | $I$ | Power per unit solid angle (from a point source). | Watts/steradian (W/sr) | | Irradiance | $E$ | Power incident on a surface area. | Watts/m² (W/m²) | | Radiance | $L$ | Power per unit solid angle per unit projected area. | W/(sr·m²) | radiometry and the detection of optical radiation boyd pdf
Radiometry is the measurement of the intensity of optical radiation, which includes visible light, ultraviolet (UV) radiation, and infrared (IR) radiation. It involves the quantification of the energy carried by electromagnetic waves, which is essential in understanding various physical phenomena. Radiometry is used in a wide range of applications, including the characterization of light sources, the measurement of optical properties of materials, and the detection of optical radiation. Before detection can occur, the optical signal must
| Text | Focus | Boyd’s Distinction | |------|-------|--------------------| | Optical Radiation Measurements (Nicodemus) | Radiometric theory | Boyd adds detector noise | | Photodetectors (Dereniak & Crowe) | Device physics | Boyd adds radiometric transfer | | Optical Detectors (Kingston) | Quantum-limited detection | Boyd is more accessible for experimentalists | | Joules (J) | | Radiant Flux (Power)
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Boyd utilizes the concept of (often called Etendue or $A\Omega$ product).