Sound traveling toward the probe is measured as positive intensity, while sound traveling opposite to the direction of the probe registers as negative intensity. As shown in the above illustrations, a sound originating in front of the probe will be measured as a positive intensity, whereas a sound from behind the probe will be negative.Ī sound intensity probe measures only the component of the sound traveling parallel to the probe axis. A two-microphone sound intensity probe measures only the component of the total sound intensity traveling parallel to the axis of the probe. Because sound intensity is based on both acoustic pressure and velocity it has a direction. By comparing the differences between the sound signal at the two microphones, the sound intensity analyzer can compute both the sound pressure and particle velocity at the mid-point between the two microphones, and can multiply the two together to compute the sound intensity. The most common method of measuring the particle velocity is a pair of phase-matched microphones locked at a fixed distance apart. It is measured in units of Watts per square metre or decibels relative to one picoWatt per square metre.Īcoustical particle velocity is difficult to measure. Sound intensity is the product of sound pressure and acoustic particle velocity. A sound field includes both acoustic pressure and particle velocity. ]In some situations there is plenty of sound pressure, but little or no overall flow of acoustical energy. However, sound pressure is only part of the whole picture. A microphone measures sound in terms of these pressure fluctuations. When acoustic energy flows through air, one result is a fluctuation of air pressure. HGC has pioneered the use of these methods in new applications including gas turbine exhaust stacks, development of novel acoustical building materials, and measurement of sound absorption. Our client base includes work for companies ranging from TransCanada Pipelines to Xerox to General Motors. Provide research and development assistance for improved noise control and enhanced sound quality.Isolate and rank individual sources in a complicated soundfield. ![]() Reduce prototype and research and development costs for complex industrial equipment and vehicle noise issues.Accurately determine sound power ratings for equipment and products, eliminating the need for expensive acoustical laboratories or anechoic chambers.HGC Engineering uses sound intensity measurement methods to: Sound intensity measurement makes it possible to achieve on-site, highly accurate, time-efficient measurements in noisy locations and allows for a more effective design of noise control or improved acoustics. The state of the art is the measurement of sound intensity HGC Engineering provides sound intensity measurement to a wide range of industries from high-tech product manufacturers to power generation. Unlike simple microphones and sound level meters, sound intensity measurements accurately capture only the sound produced by the source under test, eliminating interference from other sounds. Sound intensity describes the flow of acoustic energy produced by a sound source.
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