A Simple Measurement Method of Light Intensity for Photoirradiation Experiment Using Silicon Photocell

Abstract

A simple and rapid measurement method of light intensity for photoirradiation experiment in laboratory was investigated. It is an indirect method using commercially available silicon photocell (SPC) which is able to detect very weak light, and is utilizing linear relationship between output of SPC and rate constant of NO₂ photolysis (κ₁). Correlation coefficients between the output of SPC and each of the rate constants of NO₂ photolyses in N₂ using a batch reactor (Tedlar bag) (κ₁ (N₂)) and in air (N₂: O₂=80: 20) using a flow reactor (quartz tube) (κ₁ (air)) were 0.99₇ and 0.99₈, respectively. This method allows continuous monitoring of light intensity and detection of the decay of light intensity during photoirradiation experiment.