Field Trial In Progress for Measuring Global, Direct, Diffuse, and Ground-Reflected Irradiance Using a Static Sensor Array

We report on plans for a field trial now in progress to test measurement of global horizontal irradiance (GHI), direct normal irradiance (DNI), diffuse horizontal irradiance (DHI), and reflected horizontal irradiance (RHI) using an array of static sensors with no moving parts. As in our recent work in this area, the collection of static sensors includes reference cells in multiple orientations. In addition, our current system under test includes a modified reference cell with a collimation tube to admit only diffuse light contributions from a limited region of the sky. We are developing an analysis model to determine GHI, DNI, DHI, and RHI from the combined sensor data. Field trials have recently begun. Results will be published at a later date.