wave monitoring Articles | Environmental XPRT

Study of Geoprocesses with Complementary Mechanical and Electromagnetic Wave Measurements in an Oedometer

Particulate geomaterials can be uniquely studied with wave-based techniques. Electromagnetic and mechanical waves interact with the tested material, exciting different phenomena and revealing different information. Complementary wave measurements were implemented in a modified oedometric cell to study and to monitor different processes in geomaterials. The cell and the measuring devices are ...

Sep. 1, 1995

By ASTM International

Measurement of Shear Waves in Laboratory Specimens by Means of Piezoelectric Transducers

The use of piezoelectric ceramics to measure shear wave velocity in laboratory soil specimens is discussed. The experimental technique and interpretative methodology are described. Both bender and flat-plate ceramic elements were employed, and each performed well. Interpretation of the shear waveforms generated with each transducer improved as the number of wavelengths between the source and ...

Dec. 1, 1996

By ASTM International

Case study - SEAWATCH Spain

CLIENT: Puertos del Estado PURPOSE: Implementation of a Marine Surveilance and Information System (MIS) for Spanish Coastal waters DURATION: Phase 1, 1996 to 1998 Operational phase, 1998 onwards LOCATION: The Bay of Biscay, the Mediterranean and Atlantic sides of the Gibraltar Strait and the Canary Islands DESCRIPTION: Fugro OCEANOR was in 1995 selected by the Puertos del Estado (coast ...

Mar. 1, 2005

By Fugro OCEANOR AS

Intercomparison of a WaveGuide radar and two Directional Waveriders

Down-looking FMCW radars for wave measurements are in use already for 25 years. They have proved to be very robust and maintenance is hardly needed. Now the prices of FMCW radars came down they are being more widely applied for water level, tide, harbour oscillations and wave height at sea, lakes and rivers. Radacs WaveGuide was introduced in 1998 based upon a commercial tank radar, first Enrafs ...

Feb. 4, 2005

By Radac BV

Comparison of Directional WaveGuide Radar with Directional WaveRider Buoy

Abstract Down looking FMCW radars for measuring water level, tides and wave height have been in use for 25 years. A combination of three down looking FMCW radars, mounted on an o↵ shore location, can be used to accurately measure ocean wave height and wave direction. At locations where an o↵shore mounting construction is readily available, the major advantage of this relatively new ...

Dec. 8, 2014

By Radac BV

Case Study Norderney LOG_aLevel_ENG

Northsea Wave and Level Measuring Station In the operation of the research centre coast of the NLWKN–Norden-Norderney Apart from the coastal engineering, the coastal surveying and morphology, the storm tide warning service of the NLWKN-Norden-Norderney belong to the specific questions and tasks of the coastal area. The German Wadden Sea and the estuary regions are affected by dynamic ...

May 25, 2015

By General Acoustics e.K.

Ultrasonic Sensors: Range Vs Frequency

Ultrasonic sensors are pretty cool. Transducers send and receive waves, measurements magically get spit out by the sensor, and nothing had to touch anything, right? You can choose sensors based on range, or type of transducer, or even safety ratings. Most sensors declare their range and frequency together, which seems kind of odd. Why is the range of an ultrasonic sensor tied to its frequency? ...

Nov. 19, 2015

By Automation Products Group, Inc. (APG)

Rotating angled plate diffusing wave spectroscopy

Solid–like non–ergodic samples can be difficult to study using standard single speckle diffusing wave spectroscopy as the measurement may lack requisite ensemble averaging. We demonstrate here that this required ensemble averaging can be induced by translating the speckle over the collection optics so that multiple speckles are observed over the duration of the experiment. Translation is achieved ...

Apr. 21, 2014

By Inderscience Publishers

WorldWaves wave energy resource assessments from the deep ocean to the coast

Abstract WorldWaves is a global wave and wind climate package developed through EU and industry sponsorship over many years. The offshore data incorporates global hindcast and operational wave and wind data from ECMWF, validated and calibrated with independent satellite and buoy data worldwide. These data, which may comprise full directional wave spectra time series, are used as boundary ...

Dec. 6, 2016

By Fugro OCEANOR AS

Measuring Static Water Levels Made Easier with Eno Scientific

The Well Sounder 2010 PRO is a sonic water level meter, designed and manufactured by Eno Scientific, to measure static water level in wells, piezometers or boreholes. This portable handheld unit uses sound waves to measure the distance from the top of the well to the water level. This eliminates the need to lower anything into the well. Unlike standard water level tapes these acoustic meters are ...

Apr. 1, 2011

By Eno Scientific

A Multi-Sensor Piezometer for Shallow Marine Sediments in Coastal Environments

A multi-sensor piezometer has been developed to measure dynamic excess and ambient pore pressures in shallow marine sediments under the effect of surface waves, tides, and currents. The probe consists of a shaft (1.5 m long with five porous stones at subseafloor depths ranging from 0.10 to 0.93 m) and two upper chambers (one that is hermetically sealed for the transducer electronics and another ...

Dec. 1, 1996

By ASTM International

Determination of the damping ratio by multi-channel spectral analysis of seismic downhole data

Soil dynamic parameters such as the damping ratio are of major interest in earthquake engineering. We’ve currently published a publication which comes back to a relationship between attenuation and velocity dispersion of body waves which replaces the measurement of the amplitude characteristics of seismic signals by a frequency dependent velocity function. The implementation of this method ...

Sep. 1, 2020

By Geotomographie GmbH

Hydraulic transient wave separation algorithm using a dual-sensor with applications to pipeline condition assessment

Over the past two decades, techniques have been developed for pipeline leak detection and condition assessment using hydraulic transient waves (i.e. water hammer waves). A common measurement strategy for applications involves analysis of signals from a single pressure sensor located at each measurement site. The measured pressure trace from a single sensor is a superposition of reflections ...

Jul. 18, 2017

By IWA Publishing

Spectrovisc Q3000 Series Viscometer – A Portable Kinematic Oil Analysis Solution for Field-Based Users

1. Traditional Viscometer Theory and Design Current viscosity measurement techniques rely heavily on the use of capillary, cone and plate, and concentric cylinder viscometers. These devices are mainly limited to the laboratory setting and contain obstacles to portability. While the capillary viscometer suffers from difficult and lengthy procedures for calibration, cleaning, and temperature ...

Mar. 13, 2020

By AMETEK Spectro Scientific

Using Accelerometer Data in Proactive Maintenance of Roads

In proactive maintenance of roads, road condition is followed regularly. The key to this strategy is to react to any detected flaws in road condition before they turn into more severe damages. One of the newest techniques is using 3D-accelerometers, which have already been used for the past ten years on Road Doctor Survey Van (RDSV) and Road Doctor Maintenance Controller (RDMC) vehicles. Modern ...

Dec. 3, 2020

By Roadscanners Oy

SUNKYE TEACHES YOU HOW TO UNDERSTAND MICRO MINIATURE COAXIAL CONNECTORS

There are many kinds of micro miniature coaxial connectors: SMA, SMB, SMC, APC-7, K connector, etc. This article will give you an interpretation. Whatever connector you use, you need to pay attention to its applicable frequency range before using it. The frequency range of the connector is limited by the first circular waveguide propagation mode in the coaxial structure. Reducing the diameter ...

Nov. 1, 2019

By Sunkye International Co., LTD.

New sludge blanket level analyzer from Entech

Entech Design, Inc.’s BinMinder 9300 features a multi-channel analyzer designed for superior sludge level detection in the full range of water and wastewater applications. The system consists of an analyzer that is capable of operating from one to four sensors or transducers for reliable and cost-effective measurement. Measurements are made by transmitting a high frequency sound wave and ...

Jan. 3, 2009

By Entech Design, Inc.

Sensors Measure Height at Healthworks!

Sometimes ultrasonic sensors are just for fun! Ultrasonic distance sensors are used to measure stack height, wave height, crop height and more, but at HealthWorks! Children’s education center in Tupelo MS, Senix ultrasonic sensors are measuring the height of energetic children. HealthWorks! is an innovative organization educating children and their families on the importance of good ...

Sep. 19, 2015

By Senix Corporation

Ultrasonic density measurement of uranium loaded organic phase in solvent extraction process

The application of ultrasound technique in density determination of uranium loaded organic phase in solvent extraction can provide a unique solution for online density monitoring of process streams. Earlier various authors have investigated the density measurement of liquid by single ultrasound frequency. In general standard reference liquid (having low viscosity and density) is used for ...

Mar. 31, 2014

By Inderscience Publishers

Technology transfer is more important than innovation

Innovation, we are told, is the key to a successful manufacturing economy. Invent and patent something and you will make money on every one made - if it is mass produced you get an on-going income. Tony Ingham of Sensor Technology Ltd looks at his experience over two decades and tries to draw some general principles that may help Britain in its new ambition to rebuild the manufacturing base. We ...

Feb. 4, 2012

By Sensor Technology Ltd.