Investigations into helicopter pilot fatigue require that external wind forces be known in order to correlate the pilot's reaction and motions. to fully separate the forces and responses, the wind sensors must have a response time shorter than either the pilot or vehicle reaction times. this… More

Knowledge of the air pressure, temperature and humidity are required for solution of the tank fire control algorithms. the severe environment of the tank makes the use of conventional sensing techniques very difficult. the transmission efficiency of an ultrasonic signal is shown to be directly… More

The general purpose ice detector/accumulator proposed in this document employs two ultrasonic sensing modes. rayleigh waves (surface waves) are used to detect the onset of icing, and time-offlight measurements in a normal incident reflection of ultrasonic pulses from the ice layers are used for… More