optic monitoring Articles

  • How Does a Gas Analyser Work?

    Whatever you want to detect, you need to identify a property of the object that is easy-enough to measure. When it comes to monitoring and analysis of gaseous species (atoms or more commonly molecules), it turns out that it often is possible to utilize the optical properties of the gas. You need a light source, a light detector, and a characteristic behaviour of the gaseous species in question ...


    By Opsis AB

  • DOAS Explained

    DOAS stands for Differential Optical Absorption Spectroscopy. The DOAS technique was conceived almost a century ago, and it was applied on research level to air quality monitoring already in the 1970s. In the mid-1980s, the technology was then commercialised and turned into practical and wide-spread use. The acronym DOAS itself reveals quite a lot of what it is about. ...


    By Opsis AB

  • Monitoring ecosystem optical properties with the UniSpec-SC

    Understanding patterns of ecosystem properties is important if we are to effectively monitor ecosystem change due to a variety of reasons (e.g. global changes, human management). Remote sensing provides a great tool for monitoring the earth's surface at different temporal and spatial scales. Patterns of vegetation and biodiversity dynamics are important ecosystem properties, with strong links to ...


    By PP Systems

  • Fibre optic sensors as a non–destructive tool for structural monitoring

    Structural monitoring is a diagnostic tool for detection of defects/damages and for scheduling maintenance operations. It is essential to determine the safety of the structures by Non–Destructive Testing (NDT) for evaluation of strength/integrity. This assessment is required for the repair, rehabilitation and life extension of the structure. Fibre Optic Sensors (FOS) are attractive sensing ...


    By Inderscience Publishers

  • 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 ...

  • Optical Remote Sensing in the United States

    Recent studies that involve the use of optical remote sensing (ORS) techniques to measure gaseous and particulate pollutants have rekindled interest among environmental researchers and regulators in this decades-old technology. This article describes some of the key research and development projects that are helping restore ORS-based methods to the list of currently available emissions ...


    By Arcadis

  • Optical in situ characterisation of carbon nanotube growth

    In situ optical characterisation of carbon nanotube growth is reported. The nanotubes are grown on a micro–scale heater using chemical vapour deposition (CVD). Optical emission is used to characterise the temperature of the small–scale heater prior to and during growth and to monitor any temperature changes due to the interaction of the growing nanotubes with the cold gas atmosphere. In situ ...


    By Inderscience Publishers

  • Characterisation and nonlinear optical properties of CdS nano-particles

    CdS nano-particles have been synthesised using chemical precipitation. The formation and microstructure of CdS nano-particles were monitored by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Vis spectrum and z-scan technique. Using the UV-Visible, the band gap of this nano-particle is obtained about 3.54 eV and the spectrum of this material shows a 310 nm peak. X-ray diffraction ...


    By Inderscience Publishers

  • Rockfall precursor detection based on rock fracturing monitoring by means of optical fibre sensors

    The monitoring of the acoustic emissions (AEs) due to rock fracturing allows the detection of the rockfall precursor signals, leading to a strong improvement of the real time assessment of the induced risk. A network of piezoelectric sensors (PZTs) provides reliable AE data, as testified by a series of applications in non–destructive testing, but PZTs are strongly affected by lightings and ...


    By Inderscience Publishers

  • 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 ...


    By CIC Photonics, Inc.

  • Assessment of detection limits of fiber-optic distributed temperature sensing for detection of illicit connections

    Distributed temperature sensing (DTS) with fiber-optic cables is a powerful tool to detect illicit connections in storm sewer systems. High-frequency temperature measurements along the in-sewer cable create a detailed representation of temperature anomalies due to illicit discharges. The detection limits of the monitoring equipment itself are well-known, but there is little information available ...


    By IWA Publishing

  • Ping-Ping, What’s That Sound? Acoustic Fiber Optic Technology Helps Identify Problematic Water Mains

    With the deteriorating state of many aging water mains found in cities across North America, urbanites are frequently witnessing unexpected plumes of water erupt as man-made geysers in their own metropolitan backyards. While natural geysers are awe inspiring, urban geysers are much less so, due to their destruction to property, roads and the environment. Because an uninterrupted water flow is the ...


    By Pure Technologies

  • A Remote Automated Optical Field Sampling System based on the UniSpec-DC equipped with a Wireless System

    For remote locations, a reliable and repeatable field sampling method is needed for monitoring ecosystem processes for various scientific reasons (e.g. ground truthing, link vegetation indices to ecophysiological variables) (Claudio et al., in press; Fuentes et al., in press, Cheng et al., in press). To ensure that the data are collected continuously, and to collect the data during severe weather ...


    By PP Systems

  • Studies towards a switch–off optical DNA sensor based on poly(p–phenylenevinylene) grafted magnetic beads

    Much effort has been devoted towards developing efficient DNA sensors for applications in medical diagnostics, food contamination, forensics, biodefence and environmental monitoring. In this study we further evaluate the selectivity of our recently developed switch–off sensor design that utilises sandwich hybridisation between a photoluminescent anionic conjugated polymer (CP) bound capture probe ...


    By Inderscience Publishers

  • The IMPROVE_A Temperature Protocol for Thermal/Optical Carbon Analysis: Maintaining Consistency with a Long-Term Database

    Thermally derived carbon fractions including organic carbon (OC) and elemental carbon (EC) have been reported for the U.S. Interagency Monitoring of PROtected Visual Environments (IMPROVE) network since 1987 and have been found useful in source apportionment studies and to evaluate quartz-fiber filter adsorption of organic vapors. The IMPROVE_A temperature protocol defines temperature plateaus ...

  • DNAPL Source Zone Green & Sustainable Remediation Optics Manufacturing Facility Lebanon, New Hampshire case study

    Project Highlights ERDENHANCED Remediated >99% cVOC source zone [TCE] 100,000 to < 1 μg/L ERDENHANCED Realized Complete Biotransformation with no evidence of rebound ERDENHANCED Provides Multi- Year Sustainability after single deployment event. ERDENHANCED Minimizes Site, Monitoring, and Overall Remediation Costs, saving Client dollars. ...

  • Searching for storm water inflows in foul sewers using fibre-optic distributed temperature sensing

    A major drawback of separate sewer systems is the occurrence of illicit connections: unintended sewer cross-connections that connect foul water outlets from residential or industrial premises to the storm water system and/or storm water outlets to the foul sewer system. The amount of unwanted storm water in foul sewer systems can be significant, resulting in a number of detrimental effects on ...


    By IWA Publishing

  • 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 ...


    By Spectro Scientific

  • Evaluation of the FCI Fiber Optic Chemical Sensor (FOCS)™ for BTEX in Water Against EPA`s Method 8020

    The patented fiber optic chemical sensor (FOCS)™ technology is based on the principle of modulation of light transmitted along an optical fiber. A portion of the cladding of a small segment of the optical fiber is replaced by a proprietary chemical coating, which changes the refractive index in the presence of hydrocarbons. This change in the index is proportional to the concentration of ...


    By PetroSense, Inc

  • Ping-ping, what’s that sound? Acoustic fiber optic technology helps identify problematic water mains

    With the deteriorating state of many aging water mains found in cities across North America, urbanites are frequently witnessing unexpected plumes of water erupt as man-made geysers in their own metropolitan backyards. While natural geysers are awe inspiring, urban geysers are much less so, due to their destruction to property, roads and the environment. Because an uninterrupted water flow is the ...


    By Pure Technologies

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