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1. Classification of Metrology
1. Geometric metrology, commonly known as length metrology, is the first field of metrology science to form and develop. In summary, the content of geometric quantity measurement is the geometric dimensions, shape, and position of objects, which are the "three major elements" of geometric quantities. The basic parameters of geometric metrology are length and angle, as well as the derived flatness, surface roughness, roundness, cylindricity, slope, taper, involute, helix, etc. It also includes the calibration of universal measuring tools, optical instrument calibration, and measurement of special parts in production. The basic unit of geometric measurement is "meter", symbolized by "m", which is one of the seven basic units of the International System of Units. The commonly used measuring instruments for geometric measurement mainly include: measuring blocks, angle blocks, rulers, micrometers, vernier calipers, dial gauges, micrometers, flat crystals, level gauges, measuring microscopes, projectors, roundness meters, surface profilometers, gear measuring instruments, length gauges, coordinate measuring machines, etc.
2、 Temperature measurement is the use of the thermal effects of various substances to measure the temperature of an object. The content includes: ultra-low temperature, low temperature, medium temperature, high temperature, ultra-high temperature, heat, etc. The unit of measurement for temperature is Kelvin, with the symbol "K". The commonly used measuring instruments for temperature measurement mainly include mercury thermometers, thermocouples, semiconductor point thermometers, thermometers, dynamic coil instruments, temperature indicating and regulati
3、 Mechanical metrology includes mass, capacity, density, pressure, vacuum, force measurement, torque, hardness, impact, velocity, flow rate, vibration, acceleration, etc. The commonly used measuring instruments in mechanical metrology mainly include: weights, scales, belt scales, scales, standard hardness blocks, hardness testers, tension gauges, force measuring machines, load sensors, material testing machines, fatigue testing machines, torque meters, torque wrenches, torque wrench calibration devices, torsion testing machines, dynamometers, accelerometers, speed sensors, pressure gauges, blood pressure gauges, pressure gauges, pressure transmitters, fuel dispensers, density meters, flow meters, water meters, gas meters, radar speedometers, speedometers, tachometers, etc.
4、 Electromagnetic metrology is the measurement of various electromagnetic physical quantities using various electromagnetic standards, instruments, and meters based on electromagnetic principles. Electromagnetic metrology includes current, electromotive force, resistance, inductance, capacitance, magnetic field strength, magnetic flux, etc. The commonly used measuring instruments in electromagnetic metrology mainly include: standard batteries, standard voltage sources, standard current sources, resistors, capacitors, transformers, resistance boxes, ammeters, voltmeters, power meters, megohmmeters, flux meters, energy meters, energy meter calibration devices, DC potentiometers, DC bridges, AC bridges, multimeters, etc.
5、 Radio metrology r
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