Frequency response of cold wires used for atmospheric turbulence measurements in the marine environment.
We have examined the frequency response of cold-wire thermometers using 2.5-micro platinum wires with laboratory-produced salt layers. The salt layers are produced by exposure to a saline aerosol to simulate the marine environment. The frequency response was determined by measuring the response of the coated wires to a white thermal noise air flow produced by a heated wire in an airstream. The wires exhibit a relaxation behavior, with the rolloff frequency varying as the square of the total wire plus salt radius. The results show that the frequency response of the salted wires is controlled by the laminar-air-film boundary layer.
Schacher
G E
GE
Deparment of Physics and Chemistry, Naval Postgraduate School, Monterey, California 93940, USA.
Fairall
C W
CW