G01HMEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVESThis subclass covers the combination of generation and measurement of mechanical vibrations. Attention is drawn to the Notes following the title of class G01.In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme. G01H1/00 G01H1/00Measuring characteristics of vibrations in solids by using direct conduction to the detector G01H9/00, G01H11/00 take precedence G01H1/003of rotating machines G01H1/10 takes precedence G01H1/006of the rotor of turbo machines G01H1/04of vibrations which are transverse to direction of propagation G01H1/06Frequency G01H1/08Amplitude G01H1/10of torsional vibrations G01H1/12of longitudinal or not specified vibrations G01H1/14Frequency G01H1/16Amplitude G01H3/00Measuring characteristics of vibrations by using a detector in a fluid G01H7/00, G01H9/00, G01H11/00 take precedence G01H3/005Testing or calibrating of detectors covered by the subgroups of G01H3/00 calibrating geophysical instruments, e.g. seismic receivers G01V13/00 G01H3/04Frequency G01H3/06by electric means G01H3/08Analysing frequencies present in complex vibrations, e.g. comparing harmonics present acoustic presence detection G01V1/001 G01H3/10AmplitudePower G01H3/12by electric means G01H3/14 takes precedence G01H3/125for representing acoustic field distribution using optical means G01H9/002; sonar systems for imaging G01S7/56, G01S15/89; acoustic holography G03H3/00 G01H3/14Measuring mean amplitudeMeasuring mean powerMeasuring time integral of power G01H5/00Measuring propagation velocity of ultrasonic, sonic or infrasonic waves , e.g. of pressure waves G01H7/00Measuring reverberation time ; room acoustic measurements G01H9/00Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means G01H9/002for representing acoustic field distribution sonar systems for imaging G01S7/56, G01S15/89; acoustic holography G03H3/00 G01H9/004using fibre optic sensors light guides per se G02B6/00, acousto-optical devices specially adapted for gating or modulating in optical wave guides G02F1/125 G01H9/006the vibrations causing a variation in the relative position of the end of a fibre and another element G01H9/008by using ultrasonic waves measuring position using ultrasonic waves G01S15/02 G01H11/00Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties G01H11/02by magnetic means, e.g. reluctance G01H11/04using magnetostrictive devices G01H11/06by electric means G01H11/08using piezo-electric devices G01H13/00Measuring resonant frequency G01H15/00Measuring mechanical or acoustic impedance G01H17/00Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups see provisionally also G01H1/00