G:	PHYSICS
G01:	MEASURING (counting G06M); TESTING
G01H:	MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
G01H1/00:	Measuring characteristics of vibrations in solids by using direct conduction to the detector
G01H1/00B:	. of rotating machines G01H1/10 takes precedence
G01H1/00B2:	. . of the rotor of turbo machines
G01H1/04:	. of vibrations which are transverse to direction of propagation
G01H1/06:	. . Frequency
G01H1/08:	. . Amplitude
G01H1/10:	. of torsional vibrations
G01H1/12:	. of longitudinal or not specified vibrations
G01H1/14:	. . Frequency
G01H1/16:	. . Amplitude
G01H3/00:	Measuring characteristics of vibrations by using a detector in a fluid
G01H3/00B:	. Testing or calibrating of detectors covered by the subgroups of G01H3/00calibrating geophysical instruments, e.g. seismic receivers G01V13/00
G01H3/04:	. Frequency
G01H3/06:	. . by electric means
G01H3/08:	. . Analysing frequencies present in complex vibrations, e.g. comparing harmonics present acoustic presence detection G01V1/00A
G01H3/10:	. Amplitude; Power
G01H3/12:	. . by electric means
G01H3/12B:	. . . for representing acoustic field distribution using optical means G01H9/00B; sonar systems for imaging G01S7/56, G01S15/89; acoustic holography G03H3/00
G01H3/14:	. . Measuring mean amplitude; Measuring mean power; Measuring time integral of power
G01H5/00:	Measuring propagation velocity of ultrasonic, sonic or infrasonic waves, e.g. of pressure waves
G01H7/00:	Measuring reverberation time; Room acoustic measurements
G01H9/00:	Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
G01H9/00B:	. for representing acoustic field distribution sonar systems for imaging G01S7/56, G01S15/89; acoustic holography G03H3/00
G01H9/00C:	. using fibre optic sensors light guides per se G02B6/00, acousto-optical devices specially adapted for gating or modulating in optical wave guides G02F1/125
G01H9/00C2:	. . the vibrations causing a variation in the relative position of the end of a fibre and another element
G01H9/00U:	. by using ultrasonic waves measuring position using ultrasonic waves G01S15/02
G01H11/00:	Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties, e.g. capacitance or reluctance structural combination of musical instruments with microphones or other pick-up devices G10H3/16, G10H3/18, G10H3/20
G01H11/02:	. by magnetic means e.g. reluctance
G01H11/04:	. . using magnetostrictive devices
G01H11/06:	. by electric means
G01H11/08:	. . using piezo-electric devices
G01H13/00:	Measuring resonant frequency
G01H15/00:	Measuring mechanical or acoustic impedance
G01H17/00:	Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups see provisionally also G01H1/00