MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES

Introduced: September 1968

Last revised: January 1985

Classification Context

Section:: PHYSICS
Class:: MEASURING; TESTING
Subclass:: MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES

Description

G01H covers instruments and methods for measuring mechanical vibrations across the acoustic spectrum, including ultrasonic (>20 kHz), sonic (20 Hz–20 kHz), and infrasonic (<20 Hz) waves. This subclass encompasses accelerometers, vibration sensors, acoustic transducers, and related devices used to detect, quantify, and analyze vibrational phenomena in materials, structures, and media. Typical applications include non-destructive testing, structural health monitoring, condition-based maintenance, and acoustic characterization of mechanical systems. Related measurements of sound intensity, pressure, and frequency are generally classified separately under G01N (analytical testing of materials) or H04R (acoustics in general).

Scope Notes

Application references: Determining imbalance by oscillating the body to be tested and converting vibrations due to imbalance into electric variables Vibration testing of structures Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems Sonar systems designed for mapping or imaging Seismology; Seismic or acoustic prospecting or detecting Manufacture of electromechanical resonators by processes which include measurement of frequency with consequential modification of the resonator

Related Keywords

measuring AMPLITUDE of mechanical vibrationsANALYSING of mechanical vibrationsANALYSING of sound wavesELECTRONIC musical instrumentsmeasuring FREQUENCY of mechanical vibrationsmeasuring resonant FREQUENCY of bodiesmeasuring speed of flow of LIQUID(S)measuring POWER of mechanical vibrationsmeasuring PROPAGATION velocity of mechanical vibrationsmeasuring properties of SOUND(S)measuring mechanical VIBRATIONSvibrometers

9 direct subcodes

Child Classifications

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G01H 1/00 Measuring vibrations in solids by using direct conduction to the detector
G01H 11/00 Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
G01H 13/00 Measuring resonant frequency
G01H 15/00 Measuring mechanical or acoustic impedance
G01H 17/00 Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the other groups of this subclass
G01H 3/00 Measuring vibrations by using a detector in a fluid
G01H 5/00 Measuring propagation velocity of ultrasonic, sonic or infrasonic waves
G01H 7/00 Measuring reverberation time
G01H 9/00 Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means