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Research tagged "infrasound"

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Control of infrasonic noise from mechanical ventilation systems in sensitive imaging laboratories

High resolution imaging equipment, such as transmission and scanning electron microscopes, can be very sensitive to the environment in which they are installed.  Environmental factors including temperature, electromagnetic interference, vibration, and noise must be considered in the design of laboratories intended to house such instruments.  With regard to noise, this equipment is often most sensitive […]...
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Acoustics: The impact of low-frequency sound (infrasound) on imaging equipment in nanoscale research

The presentation reviews issues associated with low frequency sound—sources, human perception, typical levels, and effects on imaging systems.  A set of infrasound criteria are presented which correlate imaging resolution with low frequency sound levels.  Design features intended to mitigate infrasound generation and impact are discussed. M. Gendreau, "Acoustics: The impact of low-frequency sound (infrasound) on […]...
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The Effect of Varying Acoustic Pressure on Vibration Isolation Platforms Supported on Air Springs

Air spring isolation systems are commonly used to support sources of vibration, or equipment sensitive to vibration, in order to reduce vibration transmission from source to receiver. In the latter case, commercial isolation tables or custom-designed “plinths” may use isolation systems to provide reduced vibration environments at the base of sensitive equipment supported on them. […]...
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Specification of the effects of acoustic noise on optical tools

Optical Tools respond to internal vibration that can be excited by the external acoustic environment. The degree to which this occurs depends on many factors, but primarily the correspondence between the resonance characteristics of the tool and the frequency content of the acoustic environment in which it operates. Adverse noise environments, such as those often […]...
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Effects of Acoustic Noise on Optical Equipment

Optical tools respond to internal vibration that can be excited by the external acoustic environment. The degree to which this occurs depends on many factors, but primarily the correspondence between the resonance characteristics of the tool and the frequency content of the acoustic environment in which it operates. Adverse noise environments, such as those often […]...
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News tagged "infrasound"

CGA at Internoise 2015

CGA will be presenting two papers discussing some of our recent work at the upcoming Inter-Noise Congress in San Francisco, CA on August 9-12. Inter-Noise is the largest international gathering of experts in noise control engineering each year. The theme of conference, which is sponsored by the International Institute of Noise Control Engineering (I-INCE), is […]
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Infrasound

Michael Gendreau’s recent focus has been on the impact of low-frequency sound (infrasound, or sound at frequencies below 100 Hz) on the research environment.  He has given presentations at several conferences (Paris, Krakow, and Reno), and his work relating noise levels to resolution in high-end imaging systems will form the basis of a set of […]
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