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Sound Level Monitoring Applications

  • Noise monitoring for airports

    Airports, small and large, use noise and operations monitoring systems to reduce the noise of flight operations in the surrounding community.  Noise monitoring is generally used to evaluate noise abatement programs and to develop aircraft departure and arrival procedures that minimize the impact of aircraft noise based upon altitude, flight path, and time of day.  Noise monitoring is linked with radar tracking so that specific aircraft can be identified when noise limits are exceeded and so operational requirements can be enforced.
    Larson Davis provides noise monitoring systems to airports, consultants, and system integrators with the technology and support to make a successful program.

    By Larson Davis, a division of PCB Piezotronics based in Depew, NEW YORK (USA).

  • Noise monitoring for industrial plant monitoring

    Industrial sites are subject to regulations that limit sound and vibration levels at their perimeter and with regard to third parties. The taking of measurements at intervals remains one of the most frequently used methods of evaluating the noise and vibration levels of such sites.

    By ACOEM based in Limonest, FRANCE.

  • Noise monitoring for railways and trains

    Controlling and monitoring railway and train noise in residential and urban areas is a critical function of a railway. The noise generated can be dependent upon the engine, rail cars, rail construction, train speed, and the horn. Modern high speed trains have also created new levels of high frequency noise that create an acoustic disturbance that sounds like an aircraft going by.

    By Larson Davis, a division of PCB Piezotronics based in Depew, NEW YORK (USA).

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    Sound level measurement for safety regulations

    Hand held instruments for the measurement of an employee`s noise exposure. Frequency analysis within Sound Level Meters can also be used to determine the correct selection of hearing protection.

    By Casella based in Kempston, UNITED KINGDOM.

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    2-Channel sound insulation for building acoustics

    Façade sound insulation is measured like sound insulation between rooms, except that one `room` is actually open space. The sound level is measured inside the receiving room and outside the façade of the building. The level difference is then corrected for the influence of the reverberation time and background noise level in the receiving room. Finally a single-number index is calculated by averaging over all the frequency bands. A loudspeaker source can be used for the measurement, giving a choice of sound incidence angle. But in practice, placing the loudspeaker and getting a high enough sound level can be difficult.

  • Low frequency noise analysis using XL2

    The Data Explorer PC software for the XL2 Sound Level Meter now includes a series of professional tools for detailed analysis of low-frequency noise (LFN). The graphical representation of time varying frequency components offers an efficient process for identifying the presence and level of LFN. Also the associated high quality audio recording supports further correlation with the objective measurement data. The new features are particularly useful in the calculation of immission levels which is defined as the cumulative noise energy to which an individual is exposed over time. Exposure to low-frequency noise over extended periods can lead to a range of health problems including cardio vascular disease, insomnia and depression. The sources of low frequency noise can often be attributed to electricity sub stations, chiller plants and incinerators with continuous noise at frequencies below 200 Hz. XL2 Sound Level Meter records all Data Measuring LFN requires a class 1 sound level meter

    By NTi Audio AG based in Schaan, LIECHTENSTEIN.

  • Environmental Noise Monitoring

    The XL2 Sound Level Meter provides the dedicated solution for monitoring environmental noise in industry and communities. It measures levels and detailed spectral information in parallel and stores the data on an SD card for post-processing and reporting. A linear audio file (wav-file) may be recorded for detailed simultaneous analysis. The type approved class 1 sound level meter offers a flexible handheld instrument with accurate and reliable measurements. Data recording can be scheduled to occur at pre-determined times or automatically triggered when pre-determined levels are exceeded. Applications: Unattended noise monitoring stations (mobile or fixed installations) Annoyance assessment of noise according to ISO 1996-2 Construction noise measurements meeting the Section 61 notice (UK) Urban noise monitoring and noise mapping according to directive 2002/49/EC Verifying boundary noise level emission Advantages Handheld and compact design for field applications and stand-alone oper

    By NTi Audio AG based in Schaan, LIECHTENSTEIN.

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    Noise monitoring solutions for noise source identification

    Before you can determine what design changes are appropriate to reduce the noise emitted by a product, you need to be able to characterise it in terms of: Spectral content: The location of the dominant sources. The relative importance of dominant sources. Noise Source Identification employs a number of tools to perform such a characterisation.

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    Noise monitoring solutions for sound intensity mapping

    Sound Intensity is the measure of acoustic energy passing through a unit area. By integrating over a surface enclosing an object under test, you can calculate the object`s sound power. This can be done regardless of background noise, allowing convenient, in situ measurements of sound power. Other advantages of sound intensity measurements include the ability to determine the directionality of sound, and to quickly localise noise `hot spots`. Mapping software takes this a stage further by providing you with a contour map of noise levels to provide intuitive documentation of noise problems.

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    Sound Instrumentation for Calibration

    Unfortunately, the word calibration has ended up having two meanings; viz. to describe the use of a sound calibrator in connection with a measurement and to describe periodic verification which is carried out in a Calibration Laboratory.

    By Norsonic AS based in Lierskogen, NORWAY.

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    Sound Instrumentation for Measuring Sound

    What is the difference between sound and noise? Clearly more than the loudness only. Although an aircraft is very noisy, a mosquito at night-time can be more than enough to spoil a good night`s sleep. Instead of looking at the loudness only as a criterion for the degree of noisiness, we shall simply regard noise as what it is - viz. unwanted sound.

    By Norsonic AS based in Lierskogen, NORWAY.

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    Short term noise measurement for safety consulting

    For environmental noise monitoring when short measurements are required using a hand held Sound Level Meter. This could be for boundary monitoring of industrial sites or noise surveys for planning purposes.

    By Casella based in Kempston, UNITED KINGDOM.

  • Pulsar noise testing equipment for environmental noise monitoring

    Environmental noise is a major issue in most countries, especially in areas of high population, and the sources of noise and their adverse effects on our well-being are varied. In terms of assessing the impact of these issues, we need to be able to make suitable noise measurements, or in some cases monitor the noise levels for longer periods.

    By Pulsar Instruments plc based in Filey, UNITED KINGDOM.

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    Noise monitoring for workplaces

    Measurement of the noise exposure of an individual over the working day. They should be used for mobile workforces where it is not always practical to measure with a hand held Sound Level Meter.

    By Casella based in Kempston, UNITED KINGDOM.

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    Seismic Monitoring

    With Sound Velocity through the water being of prime importance during seismic surveys, Valeport offer a variety of sensors and probes to measure sound velocity with an unsurpassed accuracy level.  Whether you require just a sensor or a SVP for profiling, we have products for surface use and up to 6000m depth operation.

    By Valeport Ltd based in Totnes, UNITED KINGDOM.

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    Sound Insulation solutions for building acoustics

    Sound energy does not remain in the room where it is produced, but propagates throughout the building by any available path, intruding into other rooms as noise. Each country has its own standards of sound insulation in buildings, but it is measured in the same way all over the world. The noise levels in the two rooms under investigation are measured and subtracted, and the level difference is corrected for the influence of the reverberation time and background noise level in the receiving room. The measurements and calculations are made in 1/1- or 1/3-octave bands and averaged over a number of positions in the rooms. Finally a single-number index is calculated by averaging over all the frequency bands.

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