acoustic ranging Articles

  • Acoustical characterisation of porous sound absorbing materials: a review

    Over the past 50 years, the characterisation of porous sound absorbing materials has been of increasing interest to both the acoustic engineers and customers. It is particularly important that acoustic engineers are able to predict the acoustical behaviour of these materials to get a quantitative measure of the acoustic energy absorption. This paper reviews the relevant literatures over this ...


    By Inderscience Publishers

  • Intensifier of Technological Processes

    Magnetic Vortex Activator (Intensifier of Technological Processes) – ABC velocity layer machine is quill cylinder made from non-magnetic material. In the interior of intensifier locate non-equlaxial ferromagnetic particles. On the outside of intensifier locate inductor with the system of winding which create electromagnetic field. That field activate compound motion of particles and ...


    By GlobeCore GmbH

  • A Sound Projector for Acoustic Tomography and Global Ocean Monitoring

    Abstract—Long-range underwater acoustic systems, such as those used in ocean acoustic tomography, require low-frequency signals covering a broad frequency band. To meet this requirement, a novel design based on of a tunable narrow-band high-efficiency sound projector has been exploited. The projector transmits a frequency sweep signal by mechanically tuning a resonator tube (or organ pipe) ...

  • 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

  • The Basics of Sound Theory and Testing Principles: A Brief Guide for Environmental Professionals

    As awareness of environmental noise pollution grows, environmental professionals not specifically trained or experienced in the field of acoustics or noise control are being increasingly called upon to assess, predict,and/or quantify sound emissions from a variety of industrial sources. This article provides an overview of basic acoustical fundamentals, including the frequency ranges of primary ...

  • How the LISST-ABS works

    INTRODUCTION: Sequoia’s Acoustic Backscatter Sensor, LISST-ABS is designed to measure suspended sediment concentration at a point. Unlike ADCP’s which may record similar backscatter strength at multiple points along the acoustic beams (‘ranges’), the LISST-ABS  only reports backscatter signal strength at a single point about 5 cm from the transducer. The ...


    By Sequoia Scientific, Inc.

  • Christchurch Airport Case Study.

    "Effectiveness while using distress calls is great. It is easy to use. Until recently we have had limited training however the latest training just received has given a greater insight on how to make updates and changes to make it more site specific"- Ian FaulknerManager of Fire and Airfield Operations ...


    By Scarecrow Group Limited.

  • Controlling the water level of a river dam case study

    SmartScan25 provides an efficient solution for controlling water level of the Wardha river reservoir from a distance of 40m (131ft) thus preventing draughts and floods to the district of Amravati, India. Upper Wardha Dam is build up on the Wardha River at a height of 36m (118ft) and 7km (4.35mi) length and situated on the boundary of Amravati and Wardha Districts, India. Controlling the water ...

  • Noise at Work: Easier Noise Assessment & Control

    The Industrial Noise and Vibration Centre (INVC) Ltd has made its latest Digital Noise Assessment Template Available to all delegates who attend aFocus Health and Safety IOSH noise course. INVC have been providing a highly specialised acoustic consultancy service to a broad range of industries since 1985. They also deliver Noise at Work Risk Assessment and Control ...


    By Focus Health and Safety

  • Nottinghamshire County Council Chooses Casella Sound Level Meter Kits - Case Study

    When Nottinghamshire County Council needed to upgrade its 20-year-old noise monitoring equipment, it made sense to choose two of the latest high performance 63x series sound level meter kits from previous supplier, Casella - leading global specialist in occupational health and environmental risk management solutions Nottinghamshire County Council is the Minerals and Waste Planning Authority ...


    By Casella

  • Noise Cancelling Headphones: The Beginning

    Noise cancelling headphones make it possible for people to listen to audio content without having to raise the volume excessively. The special headphones can totally offset the effects of a distracting noise, enabling the wearer to relax in a noisy environment, such as when they’re travelling on an aircraft, for example. ...


    By Sound Planning Limited

  • Integrate noise measurements into your existing Process Monitoring and Control Systems.

    The ZE:908 is a small and lightweight power supply and acoustic conditioning unit for the Cirrus MV:200 microphone preamplifiers and MK:170 Outdoor microphone units. Many industrial plants have a variety of process sensors strategically placed around their site so that safety, environmental impact and efficiency can be monitored and managed, in real time, from one or more control rooms. The ...


    By Cirrus Environmental

  • Noise Control By Engineering Methods

    Noise Exposure Levels The OSHA Noise Standard (29CFR1910.95) states when the 8-hour noise exposure exceeds 90 dB-A, an effort to control noise through engineering methods must be attempted if the 90 dB-A levels are exceeded. Hearing Protection Hearing protection alone is ...

  • Where to use Outdoor Noise Monitoring Equipment?

    Noise monitoring equipment is required for environmental noise applications that need to be monitored over a period of time and where a hand-held sound level meter taking on the spot noise measurements would not be suitable. Noise Monitoring Equipment from Cirrus Environmental The Invictus range can ...


    By Cirrus Environmental

Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you