|  | G |
SECTION G — PHYSICS

INSTRUMENTS

|  | G01 |
MEASURING (counting Fulltext... Hierarchy... Expanded...G06M); TESTING

|  | G01H |
MEASUREMENT OF MECHANICAL VIBRATIONS, e.g. OF SOUND WAVES (generation of mechanical vibrations without measurement Fulltext... Hierarchy... Expanded...B06B, Fulltext... Hierarchy... Expanded...G10, Fulltext... Hierarchy... Expanded...H04R; measuring position, direction or velocity of an object Fulltext... Hierarchy... Expanded...G01C, Fulltext... Hierarchy... Expanded...G01S; transducers per se, see the relevant sub-classes, e.g. Fulltext... Hierarchy... Expanded...G01L, Fulltext... Hierarchy... Expanded...H01L, Fulltext... Hierarchy... Expanded...H04R; determining unbalance Fulltext... Hierarchy... Expanded...G01M 1/14; determining properties of materials by sonic or ultrasonic waves transmitted therethrough Fulltext... Hierarchy... Expanded...G01N; seismology, seismic prospecting, acoustic prospecting Fulltext... Hierarchy... Expanded...G01V 1/00; recording vibrations for subsequent reproduction Fulltext... Hierarchy... Expanded...G10L, Fulltext... Hierarchy... Expanded...G11B; manufacture of electromechanical resonators by processes which include measurement of frequency with consequential modification of the resonator Fulltext... Hierarchy... Expanded...H03H 3/00)

|  | G01H |
Note(s) Attention is drawn to the notes immediately following the class title (Fulltext... Hierarchy... Expanded...G01). This sub-class includes the combination of generation and measurement of mechanical vibrations.

|  | G01H 1/00 |
Measuring characteristics of vibrations in solids by using direct conduction to the detector (Fulltext... Hierarchy... Expanded...G01H 9/00, Fulltext... Hierarchy... Expanded...G01H 11/00 take precedence)

|  | G01H 1/04 |
· | of vibrations which are transverse to direction of propagation

|  | G01H 1/06 |
· · | frequency

|  | G01H 1/08 |
· · | amplitude

|  | G01H 1/10 |
· | of torsional vibrations

|  | G01H 3/00 |
Measuring characteristics of vibrations by using a detector in a fluid (Fulltext... Hierarchy... Expanded...G01H 7/00, Fulltext... Hierarchy... Expanded...G01H 9/00, Fulltext... Hierarchy... Expanded...G01H 11/00 take precedence)

|  | G01H 3/04 |
· | frequency

|  | G01H 3/06 |
· · | by electric means

|  | G01H 3/08 |
· · | Analysing frequencies present in complex vibrations, e.g. comparing harmonics present

|  | G01H 3/10 |
· | amplitude; power

|  | G01H 3/12 |
· · | by electric means (Fulltext... Hierarchy... Expanded...G01H 3/14 takes precedence) [2]

|  | G01H 3/14 |
· · | Measuring mean amplitude; Measuring mean power; Measuring time integral of power [2]

|  | G01H 5/00 |
Measuring propagation velocity of vibrations, e.g. of pressure waves

|  | G01H 7/00 |
Measuring reverberation time (measuring absorption of vibrations in a material Fulltext... Hierarchy... Expanded...G01N; modifying acoustic properties to change reverberation time Fulltext... Hierarchy... Expanded...G10K)

|  | G01H 9/00 |
Measuring characteristics of vibrations by using radiation-sensitive means

|  | G01H 11/00 |
Measuring characteristics of vibrations by detecting changes in capacitance or reluctance

|  | G01H 13/00 |
Measuring resonant frequency

|  | G01H 15/00 |
Measuring mechanical or acoustic impedance [3]