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G:PHYSICS
 G01: MEASURING (counting G06M); TESTING
  G01P: MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
   G01P1/00: Details of instruments
   G01P1/00B: used for damping
   G01P1/00C: used for thermal compensation
   G01P1/02: Housings
   G01P1/02B: . . for acceleration measuring devices
   G01P1/02C: . . for speed measuring devices, e.g. pulse generator
   G01P1/04: Special adaptations of driving means
   G01P1/06: IPC 2 Indicating or recording devices, e.g. for remote indication indicating or recording in general G01D; registering or indicating working conditions of vehicles G07C5/00
   G01P1/07: indicating devices, e.g. for remote indication
   G01P1/08: . . Arrangements of scales, pointers, lamps or acoustic indicators, e.g. in automobile speedometers
   G01P1/10: . . . for indicating predetermined speeds
   G01P1/10C: . . . . by comparing the value of the measured signal with one or several reference values in general G01R17/00
   G01P1/10D: . . . . by comparing the time duration between two impulses with a reference time
   G01P1/11: . . . . by the detection of the position of the indicator needle
   G01P1/12: Recording devices
   G01P1/12B: . . Speed recorders
   G01P1/12B2: . . . with recording discs
   G01P1/12C: . . for acceleration values
   G01P1/14: . . for permanent recording G01P1/12B2 takes precedence
   G01P1/16: . . for erasable recording, e.g. magnetic recording
   G01P3/00: Measuring linear or angular speed; Measuring differences of linear or angular speeds
   G01P3/02: Devices characterised by the use of mechanical means
   G01P3/04: . . by comparing two speeds
   G01P3/06: . . . using a friction gear
   G01P3/08: . . . using differential gearing
   G01P3/10: . . by actuating an indicating element, e.g. pointer, for a fixed time
   G01P3/12: . . by making use of a system excited by impact
   G01P3/14: . . by exciting one or more mechanical resonance systems
   G01P3/16: . . by using centrifugal forces of solid masses governors G05D13/10
   G01P3/18: . . . transferred to the indicator by mechanical means
   G01P3/20: . . . transferred to the indicator by fluid means
   G01P3/22: . . . transferred to the indicator by electric or magnetic means
   G01P3/24: . . by using friction effects
   G01P3/26: Devices characterised by the use of fluids
   G01P3/26B: . . by using fluidic impulse generators
   G01P3/26C: . . by using a vortex chamber
   G01P3/28: . . by using pumps
   G01P3/30: . . by using centrifugal forces of fluids
   G01P3/32: . . . in a rotary container communicating with a fixed container
   G01P3/34: . . by using friction effects
   G01P3/36: Devices characterised by the use of optical means, e.g. using infra-red, visible, or ultra-violet light
   G01P3/36B: . . by using a ring laser ring lasers in general H01S3/083
   G01P3/36C: . . by using diffraction of light for measuring speed of fluids G01P5/26
   G01P3/38: . . using photographic means
   G01P3/40: . . using stroboscopic means
   G01P3/42: Devices characterised by the use of electric or magnetic means
   G01P3/44: . . for measuring angular speed
   G01P3/44B: . . . mounted in bearings bearings F16C
   G01P3/44B2: . . . . mounted between two axially spaced rows of rolling elements
   G01P3/46: . . . by measuring amplitude of generated current or voltage in general G01R19/00
   G01P3/46B: . . . . by using dynamo-electro tachometers or electric generator
   G01P3/48: . . . by measuring frequency of generated current of voltage in general G01R23/00
   G01P3/481: . . . . of pulse signals
   G01P3/481W: . . . . . using a pulse wire sensor, e.g. Wiegand wire
   G01P3/482: . . . . . delivered by nuclear radiation detectors
   G01P3/483: . . . . . delivered by variable capacitance detectors
   G01P3/484: . . . . . delivered by contact-making switches
   G01P3/486: . . . . . delivered by photo-electric detectors
   G01P3/487: . . . . . delivered by rotating magnets
   G01P3/488: . . . . . delivered by variable reluctance detectors
   G01P3/489: . . . . . Digital circuits therefor
   G01P3/48C: . . . . by using electronic circuits in general
   G01P3/48C2: . . . . . by using circuits for the electrical integration of the generated pulses measuring impulse frequency by integration G01R23/09
   G01P3/48C3: . . . . . by using circuits for the detection of the pulses delivered by the ignition system of an internal combustion engine
   G01P3/49: . . . using eddy currents
   G01P3/495: . . . . where the indicating means responds to forces produced by the eddy currents and the generating magnetic field
   G01P3/495B: . . . . . with a counter for the covered distance incorporated measuring the covered distance G01C22/00
   G01P3/495C: . . . . . with thermal compensation
   G01P3/50: . . for measuring linear speed
   G01P3/50B: . . . by using eddy currents
   G01P3/52: . . . by measuring amplitude of generated current or voltage
   G01P3/54: . . . by measuring frequency of generated current or voltage
   G01P3/56: . . for comparing two speeds
   G01P3/56B: . . . by measuring or by comparing the phase of generated current or voltage phase comparators per se H03D 13/00; phase measurement G01R25/00
   G01P3/58: . . . by measuring or comparing amplitudes of generated currents or voltage amplitude comparators H03K5/24
   G01P3/60: . . . by measuring or comparing frequency of generated currents or voltages frequency comparators H03K5/26
   G01P3/62: Devices characterised by the determination or the variation of atmospheric pressure with height to measure the vertical components of speed
   G01P3/64: Devices characterised by the determination of the time taken to traverse a fixed distance
   G01P3/66: . . using electric or magnetic means
   G01P3/66B: . . . for projectile velocity measurements
   G01P3/68: . . using optical means, i.e. using infra-red, visible, or ultra-violet light
   G01P3/68B: . . . for projectile velocity measurements
   G01P3/80: . . using auto-correlation or cross-correlation detection means
   G01P3/80B: . . . in devices of the type to be classified in G01P3/66
   G01P3/80C: . . . in devices of the type to be classified in G01P3/68
   G01P5/00: Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
   G01P5/00A: Full-field flow measurement, e.g. determining flow velocity and direction in a whole region at the same time, flow visualisation
   G01P5/00C: by measuring fluid level in front of an obstacle
   G01P5/00E: by using a jet directed into the fluid
   G01P5/00E1: . . the jet used is composed of ionised or radioactive particles
   G01P5/00H: by using an electrolyte added to the fluid
   G01P5/01: by using swirlflowmeter
   G01P5/02: by measuring forces exerted by the fluid on solid bodies, e.g. anemometer
   G01P5/04: . . using deflection of baffle-plates
   G01P5/06: . . using rotation of vanes
   G01P5/06B: . . . with mechanical coupling to the indicating device
   G01P5/07: . . . with electrical coupling to the indicating device
   G01P5/08: by measuring variation of an electric variable directly affected by the flow, e.g. by using dynamo-electric effect
   G01P5/08B: . . by using electronic circuits for measuring the dynamoelectric effect
   G01P5/08C: . . by using special arrangements and constructions for measuring the dynamo-electric effect
   G01P5/10: by measuring thermal variables
   G01P5/12: . . using variation of resistance of a heated conductor
   G01P5/14: by measuring differences of pressure in the fluid
   G01P5/16: . . using Pitot tubes, e.g. Machmeter
   G01P5/165: . . . Arrangements or constructions of Pitot tubes
   G01P5/17: . . . Coupling arrangements to the indicating device
   G01P5/175: . . . . with the determination of Mach number
   G01P5/18: by measuring the time taken to traverse a fixed distance
   G01P5/20: . . using particles entrained by a fluid stream
   G01P5/22: . . using auto-correlation or cross-correlation detection means
   G01P5/24: by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave
   G01P5/24R: . . by using reflection of acoustical waves, i.e. Doppler-effect
   G01P5/24R2: . . . involving continuous, e.g. modulated or unmodulated, waves G01P5/24R4 takes precedence
   G01P5/24R4: . . . involving pulsed waves
   G01P5/24T: . . by measuring transit time of acoustical waves measuring propagation velocity of acoustical waves per se G01H5/00
   G01P5/24T2: . . . Sing-around-systems
   G01P5/24T4: . . . by measuring phase differences
   G01P5/26: by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave
   G01P7/00: Measuring speed by integrating acceleration
   G01P9/00: Measuring speed by using gyroscopic effect, e.g. using gas, using electron beam
   G01P9/02: using rotary gyroscopes
   G01P9/04: using turn-sensitive devices with vibrating masses, e.g. tuning-fork
   G01P11/00: Measuring average value of speed
   G01P11/02: Measuring average speed of number of bodies, e.g. of vehicles for traffic control
   G01P13/00: Indicating or recording presence, absence, or direction, of movement
   G01P13/00B: of fluids or of granulous or powder-like substances
   G01P13/00B10: . . by using thermal variables
   G01P13/00B14: . . by using differences of pressure in the fluid
   G01P13/00B2: . . by using a solid body which is shifted by the action of the fluid
   G01P13/00B22: . . by using vibrations generated by the fluid
   G01P13/00B2A: . . . with electrical coupling to the indicating devices
   G01P13/00B4: . . by using deflection of baffle-plates
   G01P13/00B4A: . . . with electrical coupling to the indicating device
   G01P13/00B6: . . by using the rotation of vanes
   G01P13/00B6A: . . . with electrical coupling to the indicating device
   G01P13/00B8: . . by using dynamo-electric effect
   G01P13/00C: by using a window mounted in the fluid carrying tube G01P13/00B2, G01P13/00B4, G01P13/00B6 take precedence
   G01P13/00C2: . . with photo-electric detection
   G01P13/00D: by making use of products, e.g. chemical products added to the fluid in order to make the fluid flow visible
   G01P13/02: Indicating direction only, e.g. by weather vane
   G01P13/02A: . . indicating air data, i.e. flight variables of an aircraft, e.g. angle of attack, side slip, shear, yaw
   G01P13/04: . . Indicating positive or negative direction of a linear movement or clockwise or anti-clockwise direction of a rotational movement
   G01P13/04B: . . . with speed indication
   G01P15/00: Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
   G01P15/00C: by measuring acceleration changes by making use of a triple differentiation of a displacement signal
   G01P15/00N: Kinematic accelerometers, i.e. measuring acceleration in relation to an external reference frame, e.g. Ferratis accelerometers G01P15/00C, G01P15/16, G01P15/16B take precedence
   G01P15/00N4: . . measuring translational acceleration
   G01P15/00R: by making use of fluid seismic masses
   G01P15/00R4: . . by using thermal pick-up
   G01P15/10B: . . . . . by vibratory strings
   G01P15/02: by making use of inertia forces using solid seismic masses
   G01P15/03: . . by using non-electrical means
   G01P15/03B: . . . by measuring the displacement of a movable inertial mass
   G01P15/03B2: . . . . for indicating angular accelerations G01P15/03B3 takes precedence
   G01P15/03B3: . . . . for indicating predetermined acceleration values
   G01P15/03C: . . . by using fluidic means
   G01P15/04: . . for indicating maximum value
   G01P15/06: . . . using members subjected to a permanent deformation
   G01P15/08: . . with conversion into electric or magnetic values
   G01P15/08A: . . . Details
   G01P15/08F: . . . by magnetostrictive pick-up
   G01P15/08K: . . . for indicating angular acceleration
   G01P15/08L: . . . with indication of predetermined acceleration values G01P15/135 takes precedence
   G01P15/08N: . . . by non-contact electron transfer, i.e. electron tunneling
   G01P15/08T: . . . by thermal pick-up G01P15/00R4 takes precedence
   G01P15/09: . . . by piezo-electric pick-up
   G01P15/093: . . . by photo-electric pick-up
   G01P15/097: . . . by vibratory elements
   G01P15/097C: . . . . by acoustic surface wave resonators or delay lines
   G01P15/09B: . . . . of the compression mode type
   G01P15/09C: . . . . of the shear mode type
   G01P15/09D: . . . . of the bending or flexing mode type
   G01P15/10: . . . . by vibratory strings
   G01P15/105: . . . by magnetically sensitive devices
   G01P15/11: . . . by inductive pick-up
   G01P15/12: . . . by alteration of electrical resistance (G01P15/08T, G01P15/105 take precedence)
   G01P15/125: . . . by capacitive pick-up
   G01P15/12B: . . . . by potentiometers
   G01P15/12C: . . . . by metal resistance strain gauges, e.g. wire resistance strain gauges
   G01P15/12D: . . . . by piezo-resistive elements, e.g. semiconductor strain gauges
   G01P15/12E: . . . . by semiconductor devices comprising at least one PN junction, e.g. transistors
   G01P15/13: . . . by measuring the force required to restore a proofmass subjected to inertial forces to a null position
   G01P15/135: . . . by making use of contacts which are actuated by a movable inertial mass
   G01P15/13B: . . . . with electrostatic counterbalancing means
   G01P15/13C: . . . . with electromagnetic counterbalancing means
   G01P15/13D: . . . . with piezo-electric counterbalancing means
   G01P15/14: by making use of gyroscopes
   G01P15/16: by evaluating the time-derivative of a measured speed signal
   G01P15/16B: . . for measuring angular accelerations
   G01P15/18: in two or more dimensions
   G01P21/00: Testing or calibrating of apparatus of devices covered by the preceding groups
   G01P21/02: of speedometers
   G01P21/02B: . . for measuring speed of fluids; for measuring speed of bodies relative to fluids for measuring volume flow G01F25/00A