Unit III Noise Measurement and Instrumentations.pptx

Sound intensity is typically measured using a sound intensity probe, which consists of two closely spaced microphones. By analyzing the time delay and phase difference between these microphones, it is possible to determine both the direction and magnitude of sound intensity.Sound intensity mapping involves measuring and visualizing the sound

intensity at various points in a given space Sound intensity maps, also known as sound intensity contour plots, show how sound energy is distributed across an area. These maps can help identify sources of sound, evaluate sound propagation, and assess sound exposure levels in a room or environment.

Sound intensity mapping is useful for tasks such as noise source identification, optimizing acoustic designs in buildings
Sound intensity is typically measured using a sound intensity probe, which consists of two closely spaced microphones. By analyzing the time delay and phase difference between these microphones, it is possible to determine both the direction and magnitude of sound intensity.
Sound intensity is typically measured using a sound intensity probe, which consists of two closely spaced microphones. By analyzing the time delay and phase difference between these microphones, it is possible to determine both the direction and magnitude of sound intensity.
Sound intensity is typically measured using a sound intensity probe, which consists of two closely spaced microphones. By analyzing the time delay and phase difference between these microphones, it is possible to determine both the direction and magnitude of sound intensity.
Sound intensity is typically measured using a sound intensity probe, which consists of two closely spaced microphones. By analyzing the time delay and phase difference between these microphones, it is possible to determine both the direction and magnitude of sound intensity.Sound intensity mapping involves measuring and visualizing the sound

intensity at various points in a given space Sound intensity maps, also known as sound intensity contour plots, show how sound energy is distributed across an area. These maps can help identify sources of sound, evaluate sound propagation, and assess sound exposure levels in a room or environment.

Sound intensity mapping is useful for tasks such as noise source identification, optimizing acoustic designs in buildings.
Sound intensity mapping involves measuring and visualizing the sound

intensity at various points in a given space Sound intensity maps, also known as sound intensity contour plots, show how sound energy is distributed across an area. These maps can help identify sources of sound, evaluate sound propagation, and assess sound exposure levels in a room or environment.

Sound intensity mapping is useful for tasks such as noise source identification, optimizing acoustic designs in buildings.
Sound intensity mapping involves measuring and visualizing the sound

intensity at various points in a given space Sound intensity maps

1. Title: Sound Intensity and Sound power Mapping Subtitle: Understanding and Visualizing Acoustic Energy Distribution

2. Introduction: Sound intensity and sound power mapping are techniques used to analyze and visualize the distribution of sound energy in a given space. These techniques are often employed in various fields, including environmental acoustics, architectural acoustics, and industrial noise control. Here's an overview of both concepts:

3. Sound Power Sound power is a measure of the total acoustic energy radiated by a sound source in all directions. It is typically expressed in watts (W). Sound power is an intrinsic property of a sound source and remains constant regardless of the distance from the source or the environment.

4. Sound Intensity: Sound intensity measures the rate of sound energy transfer through a unit area perpendicular to the direction of sound propagation. It is expressed in watts per square meter (W/m²). Sound intensity is a vector quantity, as it has both magnitude and direction. It provides information about the direction of sound energy flow. Sound intensity can be used to determine the spatial distribution of sound energy in a specific area.

5. Numerical 1: Q. A person whistles with the power of 0.9 × 10 -4  W. Calculate the sound intensity at a distance of 7m. Solution: Given P = 0.9 × 10 -4  W r = 7m Sound intensity formula is I = P / A I = 0.9×10 −4  / 590.696 I = 152.36 x 10 -9  W/m 2

6. Measuring Sound Intensity Sound intensity is typically measured using a sound intensity probe, which consists of two closely spaced microphones. By analyzing the time delay and phase difference between these microphones, it is possible to determine both the direction and magnitude of sound intensity.

7. Sound Intensity Mapping: Sound intensity mapping involves measuring and visualizing the sound intensity at various points in a given space Sound intensity maps, also known as sound intensity contour plots, show how sound energy is distributed across an area. These maps can help identify sources of sound, evaluate sound propagation, and assess sound exposure levels in a room or environment. Sound intensity mapping is useful for tasks such as noise source identification, optimizing acoustic designs in buildings.

8. Sound Power Mapping: Sound power mapping is less common than sound intensity mapping. It involves estimating the sound power of individual sources or components in a complex acoustic environment. This technique can be employed in situations like product sound quality testing, where it is important to isolate and evaluate the contribution of individual components or sources to the overall sound.

9. Application: Environmental Noise Assessment: Sound intensity and sound power mapping can be used to assess and monitor environmental noise levels. Industrial Noise Control: In industrial settings, mapping sound intensity and power can help identify machinery or processes that generate high noise levels. Architectural Acoustics: Sound intensity mapping can be used to optimize the acoustic design of buildings, auditoriums, concert halls, and other architectural spaces Aeroacoustics and Aerospace: Medical Imaging:

10. Case Study:

11. Conclusion: Sound intensity and sound power mapping are invaluable techniques for understanding and managing noise in various settings. These mapping methods allow for the visualization of sound sources, their intensity distribution, and their contribution to overall noise levels. quantifying its intensity and power, these techniques help improve the quality of products, enhance environmental quality, and optimize acoustic environments. As technology and measurement methods continue to advance, sound intensity and sound power mapping will play an increasingly significant role in noise control and acoustic design across various industries .

12. Video Demonstration:

13. Sound Power and noise source identification video Demonstation

14. references https://www.sintechnology.com/portfolio-articoli/noise-measurements-and-sound-intensity-measurements/ https://core.ac.uk/download/pdf/37987396.pdf https://www.youtube.com/watch?v=ko6eT5HGm9M https://apps.dtic.mil/sti/tr/pdf/ADA279246.pdf https://www.aearotechnologies.com/wp-content/uploads/2022/09/sound_intensity_mapping_ince_2017.pdf https://www.onlinemictest.com/