The Normal Incidence Multifilter Radiometer (NIMFR) is a ground-based instrument that provides a time series of the shortwave spectral direct normal irradiance. Additionally, a broadband silicon detector can crudely measure the direct normal broadband irradiance.
These irradiance measurements can be used to infer clear sky aerosol optical depth and columnar abundances of ozone and water vapor. The NIMFR is one of a class of instruments known as sun photometers.
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Flynn C, DD Turner, A Koontz, D Chand, and C Sivaraman. 2012. Aerosol Best Estimate (AEROSOLBE) Value-Added Product. DOE ARM Climate Research Facility. DOE/SC-ARM/TR-115.
Hodges GB and JJ Michalsky. 2011. Multifilter Rotating Shadowband Radiometer (MFRSR) Handbook; with Subsections for the Following Derivative Instruments: Multifilter Radiometer (MFR); Normal Incidence Multifilter Radiometer (NIMFR). U.S. DOE, Office of Science, Office of Biological and Environmental Research. DOE/SC-ARM/TR-059.
Michalsky J, F Denn, C Flynn, G Hodges, P Kiedron, A Koontz, J Schlemmer, and SE Schwartz. 2010. "Climatology of aerosol optical depth in north-central Oklahoma: 1992–2008." Journal of Geophysical Research – Atmospheres, 115(D7), D07203, 10.1029/2009jd012197.
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Koontz A, D Flynn, G Hodges, J Barnard, E Kassianov, and C Flynn. 2009. ARM Multi-year/Multi-site MFRSR Aerosol Optical Depth Assessment. Presented at Atmospheric Radiation Measurement (ARM) Science Team Meeting.
Voyles JW. 2007. ACRF Instrumentation Status: New, Current, and Future