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Metrology

Metrology is the science of measurement, embracing both experimental and theoretical determinations at any level of uncertainty in any field of science and technology.

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Second (unit of time)

The unit of time, the second, abbreviated s, was at…

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Metre (or meter)

The unit of length is the meter (or metre), defined…

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Influence quantities in measurements

In metrology, in cases where the environmental conditions of the…

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Measurement error

Measurement error is the difference between a measured value of…

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Measurement uncertainty

Measurement uncertainty is the degree of uncertainty with which the…

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Dynamic error

In metrology, dynamic errors are caused by dynamic influences acting…

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Static error

In metrology, static errors are those errors evaluated in static…

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Measurement chain

With measurement chain, we refer to the set of stages…

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Mobility error

In metrology, the mobility error is mainly due to the…

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Gross error

In metrology, gross errors are those attributable to inexperience or…

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Piezoelectric transducer

The relationship between the mechanical stress applied to the crystal…

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Temperature

Temperature is a physical property of a material that gives…

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Calibration

Calibration is the procedure used to establish a relationship between…

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Repeatability

In metrology repeatability is a static characteristic of an instrument defined as…

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Stability

In metrology, stability is the ability of an instrument to…

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Drift

In metrology drift can be defined as the variation caused…

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Threshold of hearing

Sound level measurements in decibels are generally referenced to a…

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Dead space or Threshold

In metrology, dead space or threshold is a static characteristic of…

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Resolution

In metrology the resolution of a measuring instrument is the…

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Range of interval (or span)

In metrology the range of the interval \([a, b]\) is the…

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Reproducibility

In metrology, the term “reproducibility,” when reported in instrument specifications,…

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Linearity

In metrology, linearity is actually a measure of nonlinearity of…

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Precision

In metrology, precision indicates the repeatability or reproducibility of an…

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Sensitivity

In metrology sensitivity of a measuring instrument is that metrological…

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Accuracy vs Precision

The difference between precision and accuracy needs to be understood…

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Accuracy

Accuracy is the degree of agreement of the measured dimension…

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Hysteresis

Hysteresis is a delay of the effect when the forces…

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Luminous intensity (candela)

The units of luminous intensity based on flame or incandescent…

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Measurement instrument

A device used for the measurement of a certain physical…

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Time

Time is an abstract entity (as well as a physical…

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Calorimetry

Calorimetry is used to measure the amount of thermal energy…

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Hertz

The hertz (symbol: Hz) is the derived unit of frequency…

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Voltage

The potential energy, stored in the form of an electric…

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Linear Variable Differential Transformer (LVDT)

A linear variable differential transformer (LVDT) is one of the…

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MEMS accelerometer

The accelerometers realized with MEMS technology (Micro-Electro-Mechanic System) are nothing…

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Laser accelerometer

The laser accelerometer is a particular type of the accelerometer…

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Piezoelectric accelerometer

The piezoelectric accelerometer uses, as a principle for detecting mass…

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Capacitive accelerometer

The capacitive accelerometer uses, as the operating principle for detecting…

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LVDT accelerometer

The LVDT accelerometer uses an LVDT (Linear Variable Differential Transformer)…

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Piezoresistive accelerometer

The piezoresistive accelerometer is a variant of the strain gauge…

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Strain gauge accelerometer

The strain gauge accelerometer uses the same principle of the…

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Apparent weight

Apparent weight is a property of objects that correspond to…

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Specific weight

The weight of a unit volume of a substance is…

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Weight

Weight is the force of gravity acting on an object.…

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Accelerometer

An accelerometer is a measuring instrument able of detecting and/or…

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Decibel

The decibel (symbol: dB) is a unit of measurement used…

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Tolerance

Tolerance means the limit or acceptable limits of the variations…

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Systematic error

Systematic errors are predictable and typically constant or proportional to…

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Random error

Random error is always present in a measurement. It is…

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Parallax

Parallax is a deceptive change in the relative position of…

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Reading error

Reading error is that what happens when evaluating the relative…

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Insertion error

The insertion error is caused by the presence of the…

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Rapidity error

The error of rapidity is that metrological quality of a…

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Error band

The range of maximum deviation of the transducer output from…

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Fidelity error

In Metrology, it is said that a measuring instrument is…

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Zero error

Zero error means the error that is made when long-term…

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Sensor

In Metrology, a sensor is a sensitive device placed in…

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Transducer

A transducer is a technological device capable of switching the…

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Gravimeter

The gravimeter is a particular type of accelerometer specifically designed…

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Barograph

A barograph is an altimeter equipped with devices for recording…

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Barothermograph

A barothermograph consists of a barograph and a thermograph, which…

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Altimeter

An altimeter is a measuring instrument used to determine the…

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Thermograph

A thermograph is a measuring instrument capable of recording the…

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Barothermohygrograph

A barothermohygrograph consists of a barograph and a hygrograph, which…

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Hygrograph

A hygrograph is a measuring instrument consisting of an absorption…

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Bathythermograph

A bathythermograph is a measuring instrument used mainly in bathymetry,…

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Thermohygrograph

A thermohygrograph is a measuring instrument used in meteorology, consisting…

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Bolometer

The bolometer is a measuring instrument made by Langley Samuel…

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Electric thermometer

Electric thermometers are temperature transducers that exploit the phenomena of…

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Resistance thermometer

Resistance thermometers are a type of electric thermometers, simple resistive…

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Thermistor (semiconductor thermometer)

Thermistors are electric thermometers made by sintering semiconductor powders such…

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Thermocouple

A thermocouple is a temperature transducer (electric thermometer) whose physical…

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Strain gauge (extensometer)

In Metrology, extensometry studies the measurement of the deformation of…

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Sensibility

In metrology, the sensitivity of a measuring instrument is a…

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Noise

In metrology, noise is defined as the set of random…

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International System of Units (SI)

The International System of Units universally abbreviated SI (from the…

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True value

In metrology, the exact value of a variable is called…

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Measurement

In metrology the term measurement is closely associated with all the…

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Absolute error

The absolute error is generally defined as the difference between…

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Length

The length, quantitatively and objectively, identifies a material body according…

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Uncertainty

In metrology, the estimation of the dispersion of the values…

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Measurand

A measurand is defined as a physical quantity to be measured (such as length,…

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Physical quantity

A physical quantity is defined as a physical property of…

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Quantity value

In metrology, the quantity value represents the number and the…

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Metrology

Metrology is the science of measurement, embracing both experimental and…

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Dimensionless quantity

Some quantities are defined as the ratio of two quantities…

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