Measuring linear or angular speed Measuring differences of linear or angular speeds

GPHYSICS G01Measuring instruments G01PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT

G01P3/00Measuring linear or angular speed Measuring differences of linear or angular speeds

G01P3/02Devices characterised by the use of mechanical means G01P3/04by comparing two speeds G01P3/06using a friction gear G01P3/08using differential gearing G01P3/10by actuating an indicating element G01P3/12by making use of a system excited by impact G01P3/14by exciting one or more mechanical resonance systems G01P3/16by using centrifugal forces of solid masses G01P3/18transferred to the indicator by mechanical means G01P3/20transferred to the indicator by fluid means G01P3/22transferred to the indicator by electric or magnetic means G01P3/24by using friction effects G01P3/26Devices characterised by the use of fluids G01P3/263by using fluidic impulse generators G01P3/266by using a vortex chamber G01P3/28by using pumps G01P3/30by using centrifugal forces of fluids G01P3/32in a rotary container communicating with a fixed container G01P3/34by using friction effects G01P3/36Devices characterised by the use of optical means G01P3/363by using a ring laser G01P3/366by using diffraction of light G01P3/38using photographic means G01P3/40using stroboscopic means G01P3/42Devices characterised by the use of electric or magnetic means G01P3/44for measuring angular speed G01P3/443mounted in bearings G01P3/446mounted between two axially spaced rows of rolling elements G01P3/46by measuring amplitude of generated current or voltage G01P3/465by using dynamo-electro tachometers or electric generator G01P3/48by measuring frequency of generated current of voltage G01P3/4802by using electronic circuits in general G01P3/4805by using circuits for the electrical integration of the generated pulses G01P3/4807by using circuits for the detection of the pulses delivered by the ignition system of an internal combustion engine G01P3/481of pulse signals G01P3/4815using a pulse wire sensor G01P3/482delivered by nuclear radiation detectors G01P3/483delivered by variable capacitance detectors G01P3/484delivered by contact-making switches G01P3/486delivered by photo-electric detectors G01P3/487delivered by rotating magnets G01P3/488delivered by variable reluctance detectors G01P3/489Digital circuits therefor G01P3/49using eddy currents G01P3/495where the indicating means responds to forces produced by the eddy currents and the generating magnetic field G01P3/4953with a counter for the covered distance incorporated G01P3/4956with thermal compensation G01P3/50for measuring linear speed G01P3/505by using eddy currents G01P3/52by measuring amplitude of generated current or voltage G01P3/54by measuring frequency of generated current or voltage G01P3/56for comparing two speeds G01P3/565by measuring or by comparing the phase of generated current or voltage G01P3/58by measuring or comparing amplitudes of generated currents or voltage G01P3/60by measuring or comparing frequency of generated currents or voltages G01P3/62Devices characterised by the determination or the variation of atmospheric pressure with height to measure the vertical components of speed G01P3/64Devices characterised by the determination of the time taken to traverse a fixed distance G01P3/66using electric or magnetic means G01P3/665for projectile velocity measurements G01P3/68using optical means G01P3/685for projectile velocity measurements G01P3/80using auto-correlation or cross-correlation detection means G01P3/803in devices of the type to be classified in G01P3/66 G01P3/806in devices of the type to be classified in G01P3/68