using ultrasonic, sonic or infrasonic waves

Full Title

Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic or electromagnetic waves, or particle emission, not having a directional significance, are being received > using ultrasonic, sonic or infrasonic waves

Classification Context

Section:

PHYSICS

Class:

MEASURING; TESTING

Subclass:

RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES

Child Classifications

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• G01S 3/801 Details
• G01S 3/802 Systems for determining direction or deviation from predetermined direction
• G01S 3/82 with means for adjusting phase or compensating for time-lag errors
• G01S 3/84 with indication presented on cathode-ray tubes
• G01S 3/86 with means for eliminating undesired waves, e.g. disturbing noises