Looking Back: The Early Years of Acoustics and Noise Measurement (1980s) -- Part 1 Measuring Noise the Hard Way -- Sound Power Measurements, Finland in 1985 "This photo shows me in 1985, measuring the sound power of a woodworking machine using the sound intensity method," says Esko Rytkönen , a noise expert with more than four decades of experience. On the right is Finland's first sound intensity meter , the Brüel & Kjær 3360 . In the middle is the HP 9816 measurement compute