Definitions for "Actinometer"
An instrument for measuring the direct heating power of the sun's rays.
An instrument for measuring the actinic effect of rays of light.
an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect)
a chemical system or a physical device by which the number of photons in a beam absorbed into the defined space of a chemical reactor can be determined integrally or per time
Keywords:  exposure, early, calculator, type
early type of exposure calculator.