noise analyzer Articles

  • Wind Energy Production Estimates: Moving Beyond Time Averages

    No need to be a statistician to see that averages are often useful to compare different things. And yet, they often fall short as a true measure of performance. For instance, we use averages to compare the current weather against the climate normals or to get a sense of how our favorite sport team or player is doing. Team (player) statistics are a concise way of combining the scores from many ...


    By AWS Truepower, LLC

  • Noise Measurement

    Definitions Threshold and criterion levels The threshold level is the A-weighted sound level at which a personal noise dosimeter begins to integrate noise into a measured exposure. For example, if the threshold level on a sound level meter is set at 80 decibels (dB), it will capture and integrate into the computation of dose all noise in the employee's hearing zone that equals or exceeds 80 dB. ...


  • Noise Mapping in Lille

    Lille, with a population of 1091 million inhabitants is the 4th largest agglomeration in France after Paris, Lyon, and Marseille. Situated at the heart of a network of 464 km motorways connecting six European cities (Brussels, Bonn, the Hague, London, Luxembourg and Paris), the metropolis of Lille also has the densest railway network of France after Paris. Pascal Thomas and his team of 8 ...

  • Weather Data for Noise Monitoring

    “Weather conditions are the single largest variable factor in how sound travels over large distances,” says Steve Bilawchuk principal partner and engineer at ACI Acoustical Consultants Inc. “Wind speed and wind direction are of crucial importance.” ACI is an acoustical engineering consulting company based in Alberta, Canada, which uses ...

  • Noise Monitors and Meters

    Sound level meters Description and ApplicationsThe sound level meter is a lightweight instrument for the measurement of sound pressure level (SPL) in decibels. All ANSI-approved meters meet minimum requirements that include an A-weighted network, a slow-response meter characteristic, and a fully graduated scale with measurements ranging from 80 to 130 dBA. The Type II meter is most frequently ...

  • That air conditioner noise is annoying!

    The sound of the HVAC System in your office or factory may be annoying depending on who you ask; the person who has to live with it, or the person who has to pay for it. To measure background noise levels objectively, we use Noise Curves. International standards organizations (ISO, ANSI and ASA) recognize the need to objectify judgements on the amount of ambient noise in enclosed ...


    By NTi Audio AG

  • Canarina CUSTIC software · noise abatement modeling · noise analysis · introduction 7

    The intensity of two sounds L1 and L2 can be added in decibels with the standard equation: LdB=10 log[(p1/p0)2+[(p2/p0)2] and then, LdB=10 log[10L1/10+ 10L2/10] In this way, ...

  • INTA – exterior noise certification of Airbus A330 MRTT

    INTA is a Public Research Body specialising in aeronautic and space research and technological development. It owns a multitude of Brüel & Kjær products including a 30-channel PULSE system and a 6-channel LAN-XI system which are used daily. One of the latest and most important jobs performed by INTA is the Noise Certification of Airbus Military’s A330 MRTT which it achieved ...

  • Reducing noise levels through engineering controls

      It"s fairly easy to control personal exposure to noise by limiting exposure time or using hearing protectors like ear plugs or ear muffs.  Engineering controls are usually applied to the machinery that produces noise. Imagine a 200 foot x 175 foot manufacturing facility with a 30 foot high ceiling.  In this building are a variety of cut-off saws, grinders, millers and other ...

  • NASA acts to reduce crawler transporter noise

    The United Space Alliance sought outsideassistance to evaluate and develop noise controlmeasures for NASA’s two CTs at KSC aspart of a modernisation and upgrading program.NASA selected Noise Solutions Inc. (ageneral acoustical contractor) and their subcontractorFaszer Farquharson & Associates ofCalgary, Canada to engage in this project. Thefirst phase of the sound study ...

  • Case Study: Glastonbury Festival - Noise Monitoring At Glastonbury Festival

    In 1970, an entrance fee of just 1.00 would have permitted you, and about another 1500 'free spirits' to enjoy a weekend of listening to the likes of Quintessence, Marc Bolan and T-Rex, while at the same time savouring the undoubted 'delights' of free raw milk!! Almost three decades later, and at slightly greater expense, you and over 100,000 other people can now enjoy the delights and unique ...

  • 2250 Hand-held Analyzer now Reverberates

    The development mantra for the 2250 Hand-held Analyzer 'easy, safe and clever' has now been applied to reverberation time. A new software package extends Type 2250's powerful functionality with reverberation time analysis. Easy, Safe and CleverReverberation Time Software BZ-7227 applies Type 2250s 'easy, safe and clever' concept to reverberation time. Press the Start key, clap your ...

  • FTIR resolution requirements for industrial gas analyzers

    FTIR Spectroscopy is a widely used technique for gas analyses in industrial applications. It is a technique used in the semiconductor industry for measuring the purity of cleaning, etching, and epi-treatment gases used with various process tools, reactors, and abatement devices. Among chemical companies and R&D facilities, FTIR is applied to combustion thermodynamics and stack gas emissions; ...


    By CIC Photonics, Inc.

  • Study on traffic noise level of sylhet by multiple regression analysis associated with health hazards

    Noise is unacceptable level of sound that creates annoyance, hampers mental and physical peace, and may induce severe damage to the health. Along with the increasing degree of air and water pollution, noise pollution is also emerging as a new threat to the inhabitants of Sylhet City. Exposure to high level of noise may cause severe stress on the auditory and nervous system of the city dwellers, ...


    By University of Tehran

  • Narrowband FFT Analysis in a Hand-held Analyzer – A Product Engineer’s Tale

    “Wheeeeeeek… When pronounced in a falsetto voice, that’s the noise the brand new product makes. Hurts the ears, I’ve heard it so many times. Always the same pitch, at least to my ears. The unusual thing is that not all the units make the sound. The helical gear drive is supposed to be as quiet as possible and now I’ve got to fi gure out what the problem is.” If the above strikes a chord, then ...

  • Liquid application

    The CLD 88 enables to detect down to pMol level (nitrite / nitrate levels in drinking water).The new sample tube we are using (type 1), is optimized for this application. The internal flow restriction ismade from stainless steel and it can be cleaned in an ultrasonic cleaner. The sample flow of 110 ml/minminimizes the effect of the helium bubbles in the liquid sampler, which results in very low ...


    By ECO PHYSICS INC.

  • National Aerospace Laboratories (CSIR) – celebrating 50 years of excellence

    National Aerospace Laboratories (NAL), Bangalore is a constituent of the Council of Scientific and Industrial Research of India (CSIR). Originally started as National Aeronautical Laboratory, it was renamed National Aerospace Laboratories to reflect its major involvement in the Indian space programme, its multidisciplinary activities and it’s global positioning. Over the last five decades ...

  • PULSE FRC – frequency response correction compensation is a good thing

    Furthermore, increased flight operations can be conducted around more restrictive airports. The determination of an aircraft type’s noise is a complex process guided by documents such as: International Civil Aviation Organization(ICAO) Annex 16 – Environmental Protection, Volume I – Aircraft Noise Federal Aviation Administration (FAA)CFR14 PART 36 – Noise ...

  • Monitoring Phenol in Water

    The Situation A plant located in the eastern United States manufactures phenolic resin for applications in plastics molding. This plant uses well water for cooling its reaction process and then discharges the water into a local creek. A leak in the reactor and associated cooling equipment would cause phenol and phenolic compounds to contaminate the cooling water. Such a leak could ...

  • Passive Seismic

    Passive seismic exploration methodology, in particular the IPSS/IPDS (Infrasonic Passive Seismic Spectroscopy/ Infrasonic Passive Differential Spectroscopy ) and PST/MST (Passive Seismic Tomography/Micro Seismic Tomography) technique uses spectroscopic and time analysis of the seismic background noise acquired passively using high sensitivity VBB (Very Broad Band) 3D seismometers.  Passive ...

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