0
Noise and Attenuation. Noise is usually defined as unwanted sound - noise, noise generation, silencers and attenuation in HVAC systems.
Attenuation of Sound Waves: When sound travels through a medium, its intensity diminishes with distance. In idealized materials, sound pressure or signal amplitude is only reduced by the spreading of the wave. Natural materials, however, all produce an effect which further weakens the sound. This further weakening results from scattering and absorption. Scattering is the reflection of the sound in directions other than its original direction of propagation. Absorption is the conversion of the sound energy to other forms of energy. The combined effect of scattering and absorption is called attenuation. Ultrasonic attenuation is the decay rate of the wave as it propagates through material.
A property of some thing or action which is essential and specific to that thing or action. Attenuation of sound within a material itself is often not of intrinsic interest. However, natural properties and loading conditions can be related to attenuation. Attenuation often serves as a measurement tool that leads to the formation of theories to explain physical or chemical phenomenon that decreases the ultrasonic intensity.
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
What are sound levels?
Usually sound pressure level (SPL) in decibels (dB) is meant. A sound level meter is an instrument which measures the sound pressure level. The reading from a sound pressure level meter (SPL meter) does not correlate well to human-perceived loudness.
What is the unit for the for the volume of sound?
The volume of a sound is measured by the sound pressure in pascals or newtons per square meter. The sound pressure level is measured by a sound pressure level meter (SPL meter).
What determines the volume of sound?
The volume of a sound is measured by the sound pressure in pascals or newtons per square meter. The sound pressure level is measured by a sound pressure level meter (SPL meter).
What is the gadget to measure sound volume?
The volume of a sound is measured by the sound pressure in pascals or newtons per square meter. The sound pressure level is measured by a sound pressure level meter (SPL meter).
What is the Difference between sound power level and sound pressure level?
Sound power or sound intensity I is a sound energy quantity.Sound pressure p is a sound field quantity.Sound intensity is sound pressure squared. I = p².See related link.
How is sound pressure converted to sound power level?
Sound power level is equal to sound pressure level and intensity level at a distance of r = 0.2821 m from the source at full sphere propagation. See related Link.
Is sound produced by changes in force's pressure's and velocity?
Sound and noise are sound pressure variations measured by an SPL meter. SPL = Sound Pressure Level.
What is the unit for measuring the relative intensity or loudness of sound?
Loudness N is measured in in sones.Loudness level LN is measured in in phons.Sound pressure level is measured in dBSPL, where the reference level of 0 dBSPL is the threshold of hearing.The ear drums and the microphones are only sensitve to the sound pressure.We measure the sound pressure with a sound level meter.Loudness is affected by sound pressure, frequency and its bandwidth, and duration (time).Usually sound is measured in Decibels.
What does sound level meter measure?
Sound level meters are instruments that measure the sound pressure level. Sound level meters, or sound meters are commonly used in noise pollution studies, examples are industrial spaces, environmental spaces, and aircraft spaces.
How is sound related to pressure?
Because our ear drums are moved only by sound pressure variations we measure the sound usually as Sound Pressure Level (SPL) or sound pressure in pascal and not as sound intensity in W/m².
What is the unit for measuring the intensity of a sound?
Loudness N is measured in in sones.Loudness Level NL is measured in phons.Sound pressure level is measured in dBSPL, where the reference level of 0 dBSPL is the threshold of hearing.The ear drums and the microphones are only sensitve to the sound pressure. We measure the sound pressure with a sound level meter.Loudness is affected by sound pressure, frequency and its bandwidth, and duration (time).Usually sound is measured in Decibels.
What do you use to measure decibels?
You measure the sound pressure with a sound pressure level meter (SPL meter).
