Optical Instrument Articles on Environmental XPRT

Optical measurement of oxygen concentration in water

The optimisation of oxygen transfer is a key element of control and regulation strategies in municipal and industrial sewage treatment plants. In 2003, HACH LANGE became the first instrument manufacturer to launch the LDO (Luminescent Dissolved Oxygen) method for determining dissolved oxygen in water. The LDO technology is based on pulsed blue light, which brings benefits such as high precision, ...

May 31, 2007

Optical Assessment of Dissolved Organic Carbon

Natural organic matter is present in all sources of drinking water. When chlorine is used for drinking-water treatment, a portion of the natural organic matter reacts to form halogenated compounds, referred to as disinfection by-products (DBPs), some of which are regulated by the USEPA due to their health effects. The implementation of stricter drinking-water quality regulations for DBPs has ...

Feb. 22, 2011

By Soil Science Society of America (SSSA)

Measurement of hydrocarbons in produced water using fiber optic sensor technology

Due to the non-availability of Freon, there is need for an alternative method to measure the concentration of hydrocarbons in the effluent from oil water separators in use in the oil industry today. Current methods use solvent extraction and IR analysis of water samples. In this paper we present an alternative method, which does not use any solvents and can provide in-situ analysis of the ...

Sep. 9, 2009

By PetroSense, Inc

Optical couplers: key hardware for high quality FTIR spectroscopy

Description Optical couplers are used to take the light coming from the source of a FTIR and route it through the sampling accessory and into the FTIR detector. This is an essential process in the effective use of the FTIR spectrometer. Therefore, optical couplers play an essential role in the proper use and maintenance of a FTIR system. Recognizing the importance of optical couplers ...

May 1, 2013

By CIC Photonics, Inc.

Estimation of stand productivity from multi-angular optical remote sensing

Global modeling of gross primary production (GPP) is a critical component of climate change research. On local scales, GPP can be assessed from measuring CO2 exchange above the plant canopy using tower-based eddy covariance (EC) systems. The limited footprint inherent to this method however, restricts observations to relatively few discrete areas making continuous predictions of global CO2 fluxes ...

Oct. 29, 2008

By PP Systems

Oil-In-Water Analysis. Verification of Particle Counter results by optical microscopy

For my research work, which concerns separation of liquid/liquid dispersions, I selected the Spectrex PC2200. It covers the whole range of droplet sizes which are of interest, i.e. from 0.5 to 100 microns. The procedure for analysis is very simple and results are obtained in less than a minute. This makes the Spectrex instrument very handy for use in the lab as well as for field measurements (A ...

Oct. 3, 2011

By Spectrex Corporation

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 ...

Jan. 1, 2011

By IWA Publishing

Spatial and temporal sampling of ecosystem optical properties with the UniSpec-DC

Satellite sensors (e.g. MODIS) provide large spatial patterns with regional or global coverage (Chen, 1999). However, the coarse resolution of satellite sensors are sometimes problematic, particularly for patchy landscapes (Turner et al., 2003). To properly validate and interpret satellite imagery, additional ground remotely sensed and biophysical data are needed. The UniSpec-DC (PP Systems, ...

Mar. 8, 2006

By PP Systems

Optical DO Sensors Opening Doors to Online Aeration Control

BACKGROUNDThe benefits of using online, automated control of aeration systems using dissolved oxygen (DO) sensors are well known in the industry and have been widely documented (e.g. Olsson et al, 2005). In most wastewater treatment facilities using activated sludge, the electricity provided to the aeration system is one of the most significant operating costs and a good control system can help ...

Oct. 22, 2006

By Water Environment Federation (WEF)

Measurement of Hydrocarbons in Produced Water Using Fiber Optic Sensor Technology (An Alternative to Freon Extraction and IR Analysis Methods)

Due to the non-availability of Freon, there is need for an alternative method to measure the concentration of hydrocarbons in the effluent from oil water separators in use in the oil industry today. Current methods use solvent extraction and IR analysis of water samples. In this paper we present an alternative method, which does not use any solvents and can provide in-situ analysis of the ...

Jan. 19, 2012

By PetroSense, Inc

Optical Company saves thousands every month using the ENCON MVC case study

Company dramatically reduces disposal costs and recycles wastewater for reuse. The Company: INCOM Corporation of Charlton, MA The Solution: ENCON Mechanical Vapor Compression Evaporator (MVC) Customer Since: January 1996 (MVC customer since October 2008) INCOM Corporation in Charlton, MA is the ...

Oct. 16, 2013

By ENCON Evaporators

Fire and Gas Protection Systems as Part of Safety Instrumented Systems and Risk Management

Garth Watkins, Director Europe, Middle East, Africa, Detector Electronics Corporation, Presented at HazardEx International Conference 2008 Process-systems operators today face increasing demands for lower costs and higher safety standards in an increasingly regulated environment. In addition, companies desire to provide a working environment that is as safe as possible. As a result, plant owners ...

Jul. 16, 2010

By Det-Tronics - Detector Electronics Corporation

Overview of Rotating Disc Electrode (RDE) Optical Emission Spectroscopy for In-Service Oil Analysis

Introduction The basis of modern oil analysis is the use of optical emission spectroscopy (OES) to measure the ppm (parts per million) levels of wear metals, contaminants and additives in oil samples. Whatever else an oil lab may measure, a multi-elemental analysis is the core of in-service oil analysis. This paper gives an overview of Rotating Disc Electrode Elemental Spectroscopy and its ...

Dec. 21, 2016

By Spectro Scientific

The determination of major and minor elements in air filters and urine for hazard assessment, using a new CCD DUAL-VIEWED ICP optical emission spectrometer

This article describes the application of a new type of CCD-based, dualviewed ICP optical emission spectrometer for the analyses of industrial hygiene types of samples. Several trace elements in air filter media are determined by ICP-OES. Urinary electrolytes and trace elements are determined in a single dilution automatically in both the axial and radial plasma viewing orientations. Results of ...

Oct. 28, 2011

By PerkinElmer, Inc.

Finding the needle in the hay stack - tracing seabed gas seepages using hullborne multibeam echo sounder, and AUV based sonar and optical systems case study

Scientific objective A better understanding of the shallow geological systems in the Barents Sea with particular attention to fluid flow Specific objectives Identify regional spatial distribution of gas flares within an area of 3000 km2 in the Barents Sea Identify and describe associated structures (i.e. pockmarks, carbonate reefs) using ...

Feb. 1, 2013

By Franatech GmbH

$Simultaneous determination of PM fractions, particle number and particle size distribution in high time resolution applying one and the same optical measurement technique$

Simultaneous determination of PM fractions, particle number and particle size distribution in high time resolution applying one and the same optical measurement technique

Abstract The Fidas fine dust monitoring systems comprise an optical aerosol spectrometer, which is characterized by very good instrument characteristics, and utilize a sophisticated approach to convert the measured information on particle number and particle size into mass concentrations. As monitoring of PM requires reliable and quality-controlled performance of the measuring systems, ...

Dec. 6, 2016

By Palas GmbH

Grain size distribution and sediment flux structure in a river profile, measured with a LISST-SL instrument

Abstract New data on sediment transport in a river are reported using a LISST-SL laser diffraction instrument that simultaneously measures velocity, optical transmission, depth, temperature, and sediment particle size distribution (PSD) isokinetically. Suspended sediment concentration (SSC)is obtained from the sum of PSD. Optical transmission is seen to be nearly constant in the top ...

Oct. 20, 2015

By Sequoia Scientific, Inc.

Scintillation effect in LISST – The importance of temperature differences

Scintillation is what makes stars twinkle. It is what causes mirage in deserts or on hot surfaces. It is what causes shimmer underwater in the vicinity of hot vents in oceans. These effects result from temperature fluctuations in air or water. The same effect can occur in a LISST optics cell if not properly controlled . The importance of scintillation in LISST instruments first became evident ...

Oct. 20, 2015

By Sequoia Scientific, Inc.

Safety Monitoring in HF Alkylation Units

How GasFinder works Boreal Laser’s GasFinder & GasFinder MC are open-path gas detectors that use an integrated transmitter/receiver unit and a remote, passive retro-reflector. In GasFinder (see below) the transceiver also houses the laser diode, drive electronics, detector module and micro-computer subsystems. The transceiver unit is contained in an IP65 enclosure and has connectors for power ...

Sep. 1, 2001

By Boreal Laser Inc.

Construction of a low–cost laser–based multiplexed spectrometer: a potential probe for environmental pollution monitoring

A low–cost, sensitive, laser–based (Helium Neon; He–Ne) optical Fourier–transformed (multiplexed) spectrometer has been constructed for the quantification of suspended particulates in the air. The optomechanical features of the spectrometer are presented together with a theoretical framework of its operation. The apparatus is calibrated by using a standard commercial spectrophotometer and has ...

Apr. 9, 2012

By Inderscience Publishers

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