acoustic instrument Articles

  • Fine-tuning acoustic isolation in buildings

    ACCIONA Infrastructure is ranked among the leading construction companies in the world - and is recognised for implementing the most advanced and innovative technology.  As research and design is vital to keep the company at the cutting edge in relation to technological developments, ACCIONA Infrastructure created a team to analyse noise and vibration. Where traditional ...

  • Measuring the Dispersion Coefficient with Acoustic Doppler Current Profilers

    Abstract: A method is evaluated for estimating the longitudinal dispersion coefficient K from velocities and bathymetry measured with an acoustic Doppler current profiler ADCP. If shear dispersion controls the mixing, the dispersion coefficient can be estimated from measurements of velocity and depth in a cross section. The dispersion coefficient has typically been measured by costly and ...


    By Teledyne RD Instruments

  • Suspended particles in wastewater: their optical, sedimentation and acoustical characterization and modeling

    Wastewater regulation and treatment is still a major concern in planetary pollution management. Some pollutants, referred to as particulate matter, consist of very small particles just suspended in the water. Various techniques are used for the suspended particles survey. Few of them are able to provide real-time data. The development of new, real time instruments needs the confrontation with ...


    By IWA Publishing

  • Estimating longitudinal dispersion in rivers using Acoustic Doppler Current Profilers

    Abstract The longitudinal dispersion coefficient (D) is an important parameter needed to describe the transport of solutes in rivers and streams. The dispersion coefficient is generally estimated from tracer studies but the method can be expensive and time consuming, especially for large rivers. A number of empirical relations are available to estimate the dispersion coefficient; however, ...


    By Teledyne RD Instruments

  • Attenuation of an ultrasonic beam by suspended particles and range of acoustic flow meters in sewer networks

    Ultrasonic flow meters are commonly used in wastewater management. Under certain circumstances, a reduction in the flow meter range may occur and cause significant error in the flow rate measurement. Attenuation due to suspended particles is one of the phenomena capable of reducing the flow meter range. The present paper examines attenuation resulting from re-suspended pond sediment over a wide ...


    By IWA Publishing

  • Statistical quality control of streamflow measurements with moving-boat acoustic Doppler current profilers

    This technical note presents a new methodology for the statistical quality control of streamflow measurements with moving-boat acoustic Doppler current profilers. The methodology consists of two alternative acceptance criteria: uncertainty-based and residual-based. The former uses the uncertainty and the latter uses the maximum residual as a measurement quality indicator. Application examples are ...


    By Teledyne RD Instruments

  • Diurnal variation of the mixing-layer height and polonium concentration in the air

    The Mixing Height (MH) is one of the most important parameters that characterise the range of the atmospheric turbulence. This parameter shows characteristic diurnal variation but cannot be measured immediately. Therefore, it is evaluated indirectly by measuring other quantities. The measurement of radon concentration in the atmospheric air is one of the methods using natural occurring ...


    By Inderscience Publishers

  • Baseline data in air quality impact studies

    The main objective of this paper is to explain not only the importance of the baseline data in air quality studies but also the general procedures and steps involved in the baseline data collection. Special considerations on the instruments and measurements for a perfect baseline data collection are also emphasized in this paper. As an example, an adequate baseline data collection procedure which ...


    By Inderscience Publishers

  • 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 ...

  • OTT ADC measurement - Germany

    Background As the open pit Cottbus Nord is making use of the water of the ponds in the protected landscape of Lakoma (a village 6 km from Cottbus) the Vattenfall Europe Mining AG (VEM) as owner of the pit was obligated to take compensation measurements. VEM entrusted the engineers of the gerstgraser Ingenieurbüro für Renaturierung (gIR) in Cottbus with the planning of the ...


    By OTT HydroMet

  • Buying Noise Measurement Equipment: how to cut costs, not quality

    At a time when budgets are under strain, the Pulsar Model 14, ultra-simple digital sound level meter offers a compliant, reliable, yet affordable noise meter. It is the preferred choice of employers looking for a meter for general purpose use whilst meeting the “Noise at Work” Regulations and the requirements of IEC 61672 to Class 2.  The ...


    By Pulsar Instruments plc

  • Media expansion monitoring improves filtration

    In municipal surface water treatment plants, optimum filter performance is a crucial component. Filtration is the primary treatment process at water treatment plants, and backwashing is the primary means to keep filters functioning properly to produce safe drinking water for the public. Since 2000, Entech Design, Inc. has used underwater acoustic sensing technology to monitor filter media ...


    By Entech Design, Inc.

  • Development of a novel odor measurement system using gas chromatography

    This paper describes a novel odor measurement system for creating arrays of virtual chemical sensors with nonoverlapping responses using ultrahigh-speed gas chromatography with a surface acoustic wave sensor (GC/SAW). This GC/SAW system provides high-resolution twodimensional olfactory images for easy recognition of many complex odors. Separation and quantification of the individual chemicals ...

  • Calibration – the sure way to accurate measurements

    Calibration   During testing, microphones and accelerometers can change sensitivity or break. They might look intact, but what happens if you continue measuring without having calibrated your transducer? Can you trust your data? Do you have to redo the entire test? In cases of extreme testing you might only have one shot at getting your measurement right as the product gets ...

  • Small yet robust - Case study

    Cirrus Research’s doseBadge provides the perfect solution for dB Consultation. From manufacturing and engineering, to the entertainment industry and schools, noisy environments need to be monitored both for the welfare of employees and the wider community. Following the introduction of The Control of Noise at Work Regulations 2005, businesses need to be aware of their employees ...


    By Cirrus Research plc

  • Controlling food additives level in a process tank case study

    SmartScan50 provides real time level measurement results of food additives during production for a major chemical supplier. The customer is a prominent supplier of ingredients and fine chemicals for the food, cosmetic, detergent, and pharmaceutical industries, and also specializing in the manufacture and development of Citric Acid, Citrates and Phosphates. The company invests greatly in its ...

  • Online measurement with OTT SLD and LogoSens2

    Background The drill called „Wallensteingraben“ connects the Lake of Schwerin with the Hanseatic city Wismar, ending in the Baltic Sea. The Wallensteingraben was originally constructed as channel and is almost 20 km long. In the context of implementing the European Water Framework Directive its ecological passability shall be improved. At the measurement site „Rothentor“ a weir system ...


    By OTT HydroMet

  • Case study - Peter Lougheed Provincial Park - Alberta, Canada

    Service: SmartBall - Leak Detection Client: Alberta Tourism, Parks and Recreation Project Date: July 2011 Location: Kananaskis, Alberta, Canada Type of Pipeline: Water Main Diameter: 6-inch Pipe Material: Polyethylene Length: 2,300 feet (700 meters) Pressure: 50 psi Results: 2 leaks Several other technologies failed to identify the location of the leaks that ...

  • Demolition Noise Monitoring with John F Hunt - Case Study

    Cirrus Environmental has enjoyed a long alliance with John F Hunt Demolition going back over many years, so much so, the company’s Health, Safety & Environmental Department has accumulated almost an historic arsenal of Cirrus equipment that charts the journey of noise monitoring over the years. About John F Hunt Demolition The ...


    By Cirrus Environmental

  • SoNoScout rides the trams

    Sound Quality and Vehicle Condition Research to evaluate sound signals inside trams has been undertaken using Brüel& Kjær binaural microphones, Time Data Recorder and PULSE data acquisition and analysis system. The tests were performed on a number of trams manufactured between 1908 and 2008, on normal town routes. Based on acoustical, spatial recordings, the initial quality ...

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