Light attenuation measurements with a unique transmissometer system

Attenuation measurements of a collimated beam of light were made in selected U.S. East Coast waters with a new, unique transmissometer system. Data were obtained in waters off Atlantic City and Cape May, New Jersey; Norfolk, Virginia; and Key West, Florida. Measurements were generally made at a wavelength centered at 534.5 nm. Spectral data were also obtained through the selection of five different filters, ranging from 473-551 nm, which were mounted in a remotely controlled filter wheel. The novel features of the custom-designed transmissometer system are discussed. These include a simultaneous temperature-measuring ability, a dual data output, and a capability of taking measurements from either ship or helicopter. Quantitative and qualitative analyses of sample data are also presented.