Is a noise detector the same as a sound level meter?
Simply put, noise detectors include sound level meters, but the concept is broader and includes individual sound exposure meters.
The essence of sound is fluctuation, elastic wave. When the sound source vibrates, it causes the vibration of the nearby air particles. Depending on the inertia and elastic properties of the air, the vibration of the air particles spreads around in the form of waves, forming sound waves. The direction of particle vibration is parallel to the direction of wave propagation, which is called longitudinal wave. The waves in the air are called density waves. Sound waves can travel through gases, liquids, and solids.
Sound pressure: the difference between the pressure and the static pressure in the medium when there are sound waves. The unit is Pa.
Noise: From a physiological point of view, all sounds that interfere with people's rest, study and work, that is, unwanted sounds, are collectively referred to as noise.
Noise pollution is a kind of physical pollution.
With the further development of urbanization, industrialization and transportation, and the increase of population density, people pay more and more attention to noise pollution, and the proportion of complaints among many environmental problems is increasing year by year. Therefore, noise pollution has become an important part of environmental monitoring.
