G01HLevel 3

MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES

**Definition:** This place covers:

Apparatus or methods for the measurement, or measurement in combination with generation, of mechanical vibrations or the like, and particularly for the measurement of:

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G01H 1/00Measuring vibrations in solids by using direct conduction to the detector

G01H 11/00Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties

G01H 13/00Measuring resonant frequency

G01H 15/00Measuring mechanical or acoustic impedance

G01H 17/00Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the other groups of this subclass

G01H 3/00Measuring vibrations by using a detector in a fluid

G01H 5/00Measuring propagation velocity of ultrasonic, sonic or infrasonic waves

G01H 7/00Measuring reverberation time

G01H 9/00Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means

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