Abstract: A non-invasive diagnostic tool and method for detecting an obstruction in a coronary artery, the diagnostic tool including a signal processor adapted to receive signals corresponding to a heart beat from a plurality of acoustic sensors attached to the chest of a patient. The signal processor is programmed to identify a diastolic portion of the signals for a plurality of heartbeats and conduct a wavelet transform analysis on the diastolic signals for determining the existence of, as well as the severity and the location of, an obstruction in a coronary artery of the patient.

Abstract: A pair of pressure sensors having their openings in diametrically opposed positions are mounted in and substantially parallel to the flow stream in a turbine type power plant for obtaining a differential pressure signal indicative of an incipient surge condition. Logic circuitry selects a threshold value, whereupon the signal is utilized to provide an output signal for taking surge corrective action.