Of Physical and engineerings, to measure consists in comparing a physical Grandeur which characterizes an object (or an event) with that of comparable nature selected like Measuring unit. The numerical value of the measured size is the number which fixes the relation between the measured size and the selected measuring unit. The device which makes it possible to carry out measurement is a measuring instrument (or measuring device ).
The measuring instrument is distinguished from simple the Capteur by the fact that it is autonomous and has its own body of posting or data storage. By opposition, the Capteur can be only the interface between a physical process and information easy to handle.
The physicists use a large variety of measuring instruments which go from instruments as simple as the scale or the Chronomètre with the Electron microscope or the Particle accelerator .
Space sizes
Length, Depth, Height, Width, Distance
- Rule, Kutsch
- Hold standard
- Comparator (measuring device)
- Slide caliper
- Thickness gauge
- Depth gauge
- Interferometer
- Gauge with float
- Rangefinder
- Gauge of deformation
- Micrometer
- Measuring machine three-dimensional
- Altimeter
Surface
Volume
Angle
Mass
Duration
- Clepsydre
- Calendar
- Stop watch
- radioactive Dating
- Clock
- Atomic clock
- Pendulum
- Sand glass
Sizes kinematics
Speed
- Speedometer Velocimeter
- Anemometer
- Rev counter
Acceleration
Mechanical magnitudes
Force
Pressure
Couples mechanical
Electromagnetic sizes
- Running: Galvanometer, Ammeter
- Load: Potential Electrometer
- : Voltmeter
- Resistance: Ohmmeter, Megger (measurement of isolation resistances)
- Spectrometer (visualization of the spectral components of an electrical signal)
- Capacitance meter (measurement of the capacities of the condensers)
- Diélectrimètre (measurement of the permittivities)
- Frequency meter (measurement of the frequency of an electrical signal)
- Inductometer (measurement of the inductance of an inductive circuit)
- Multimeter (measurement of the intensity of the current, resistance and tension)
- Oscilloscope (visualization of an electrical signal)
- Magnetometer
Power, energy
Temperature
Quantity of matter
- pH: PH-meter
- Moisture: Detecting Hygrometer
- of particles
- Smoke detector
- Geiger counter
- Cloud chamber
- Bubble chamber
- Ionization chamber
- Spark chamber
- Room with wire
- Dosimeter
Luminous intensity
See also
- metrological Metrology
- Quality of the measuring devices
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