Irradiance
Definition
Radiant power incident per unit area; distinct from electrical lamp power. Unwanted wavelengths can pass through a measurement path and add signal described as spectral leakage. Electrical lamp wattage is not specimen irradiance.
- Context
- Optical exposure
For example, changing distance or illumination geometry can change power incident per unit area without changing the lamp’s stated electrical wattage.
Filters, geometry and detector response matter when interpreting an optical result.
Related terms
- ALS
- Illumination used to search for or document optical responses under selected conditions. Excitation conditions, viewing filters and background affect what is visible....
- Barrier Filter
- An optical long-pass filter placed over the camera lens and worn as goggles by the examiner during ALS examination; blocks the excitation...
- Screening Observation
- A finding used to guide further examination without claiming specific material identification. Screening can guide further examination while allowing alternative causes. An...