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2 edition of Development of an optical ammonia sensor found in the catalog.

Development of an optical ammonia sensor

A. A. Vaughan

Development of an optical ammonia sensor

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  • 21 Currently reading

Published by UMIST in Manchester .
Written in English


Edition Notes

StatementAndrew A. Vaughan ; supervised by R. Narayanaswamy.
ContributionsNarayanaswamy, R., DIAS.
ID Numbers
Open LibraryOL21238310M

We present three types of optical ammonia sensors suitable for environmental, bioprocess, and reaction monitoring. A respective fluorescent BF2-chelated tetraarylazadipyrromethene dye (aza-BODIPYs) is physically entrapped in a polyurethane hydrogel (HydroMed D4) forming an emulsion system with vinyl-terminated polydimethylsiloxane (PDMS). The analyte-sensitive layer is covered by . An optical sensor for Hg(II) monitoring using a complex of zinc dithizonate immobilised on XAD 7 which is based on reflectance spectrophotometry has been developed in this study. Measurements were made using a kinetic approach whereby the reflectance signal is measured at a fixed time of 5 min. The sensor could be regenerated using a saturated solution of KCl in 1 M sulphuric acid. The sensor tip, which was the mirror end of the interferometer, was prepared using dip coating technique. The response of the sensor in terms of wavelength shift was recorded on to Optical Sensing Analyzer (OSA) in presence of ammonia gas. The gas concentration was varied from ppm to ppm at room temperature.


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Development of an optical ammonia sensor by A. A. Vaughan Download PDF EPUB FB2

The sensitivity to ammonia is measured by optical absorption changes. The ammonia sensing properties of PANI/SU-8 composite films are studied, and then are compared to pure PANI films elaborated by chemical way.

Experimental results show that the PANI/SU-8 optical sensor has simultaneously a rapid response to ammonia gas and regenerates easily Cited by:   Vol Issue 5, 15 MarchPages Development of an optical ammonia sensor based on polyaniline/epoxy resin (SU-8) composite Author links open overlay panel A.

Airoudj a b D. Debarnot a B. Bêche c F. Poncin-Epaillard aCited by:   Ammonia optical gas sensor developed by Jin et al. exhibited high sensitivity towards the analyte capable of detecting concentrations as low as 1 ppm at room temperature [15].

Chemically. The optical ammonia gas sensing system that was used with this spectrometer is shown in Fig. The system consists of a light source, a polyaniline gas sensor, an optical beam collection system, a spectrometer with a built-in CCD detector and a computer for data collection and by: Development of ratiometric optical fiber sensor for ammonia gas detection Abstract: A simple, low cost technique to fabricate a ratiometric optical fiber ammonia (NH 3Cited by: 4.

The optical ammonia gas sensors have a response time of less than 15 s and a fast regeneration time of less than 2 min at room temperature. The sensors have a detection limit of 1 ppm (v/v) for ammonia, with a linear dynamic range from to 18 ppm.

A very compact (device area around 40 μm2) optical ammonia sensor based on amicroring resonator is presented in this work. Silicon-on-insulator technology is used insensor design and a dye doped polymer is adopted as sensing material.

The sensor exhibitsa very good linearity and a minimum detectable refractive index shift of sensing materialas low as 8x, with a detection limit around 4 ‰.

A short reference is made of a wide practical usage of ammonia gas and its harmful properties stimulating the ever-lasting emphasis on development of spatially continuous and highly sensitive sensors.

Therefore, the development of methods based on sensors (e.g., optical and electrochemical) including those based on the use of vibrational spectroscopy becomes very attractive in precision. An optical ammonia sensor was developed from commercially available products with simple means of manufacturing.

The sensor exhibits a high sensitivity down to almost 1 μg/l ammonia, a response quicker than seconds and virtually no cross sensitivity towards pH, temperature and salinity. Aubrecht, L. Kalvoda, " Development of Ammonia Gas Sensor Using Optimized Organometallic Reagent ", Journal of Sensors, vol.Article ID8 pages, Show citation.

Many scientific papers have been written concerning gas sensors for different sensor applications using several Development of an optical ammonia sensor book principles.

This review focuses on sensors and sensor systems for gaseous ammonia. Apart from its natural origin, there are many sources of ammonia, like the chemical industry or intensive life-stock.

The survey that we present here treats different application areas for. The low concentration ammonia nitrogen detected by the MFI in the unique infrared region reveals the potential application of this optical fiber-based sensor for rivers and drinking water monitoring.

The need for environmental protection and water pollution control has led to the development of different sensors for determining many kinds of. compact, high sensitive and reproducible optical chemical sensor for ammonia.

Low cost and simplicity of sensor fabrication, the response of which can be easily observed without resorting to spectral instruments are therefore likely to be attractive.

The basis for high sensitivity (1 ppm), fast. Development of an optical fibre sensor for ammonia, urea, urease and IgG A. Sansubrino, M. Mascini Biosensors and Bioelectronics 9 (3), Anal.

Chem. All Publications/Website. OR SEARCH CITATIONS. An optical sensor for the determination of ammonia in water based on ion pairing has been investigated. A pH-sensitive dye is immobilized as an ion pair in a silicone matrix.

The colour of the dye changes from yellow to blue depending on the concentration of ammonia in the sample solution. This change is reversible. This thesis contains the development of optical-based planar and fibre waveguide ammonia gas sensor prototypes.

The sensing mechanism is based on the change of the fluorescence emission intensities of selected dye pairs caused by ammonia which is due to the Förster resonance energy transfer (FRET) between the dyes. Chapter 1 introduces the reasons for investigating optical ammonia sensors. The presented dissolved ammonia sensor shows a low LOD and wide linear response range for dissolved ammonia detection in aqueous solutions.

The fluorescence intensity difference (F 0 –F) of diluted Ag NCs solution shows a good linear relationship with the concentration of the NH 4 NO 3 solution in the range of 10− μM (− mg N L −1), and the absorbance difference (A 0 –A) of.

Abstract This study focuses on the development of an optical ammonia gas sensor, the sensing mechanism of which is based on Förster resonance energy transfer (FRET) between coumarin and fluorescein. This paper describes an optical fiber sensor for the monitoring of ammonia gas.

An open path optical technique is used to analyze the absorption lines of ammonia within the Ultra Violet region. We present an optical ammonia sensor suitable for bioprocess monitoring. A fluorescent dye is physically entrapped in a polyurethane hydrogel forming an emulsion system with vinylterminated polydimethylsiloxane (PDMS).

The sensing layer is covered by a hydrophobic porous membrane which excludes hydrophilic substances. Ammonia, diffuses through this barrier and PDMS to the protonated. This study demonstrates that by combining a modified version of the Berthelot method with microfluidic technologies and LED based optical detection systems, a low cost monitoring system for detection of ammonia in fresh water and wastewater can be developed.

The. These technologies are: 1) an optical fiber ammonia sensor having a bromocreasol purple doped sol-gel silica coating on a bent optical fiber probe as a transducer; 2) an optical fiber ammonia sensor having a dual layer (PMMA/CPR) coating on an bent optical fiber probe as a transducer; 3) an fiber opto-electrochemical ammonia sensor having an.

Optical sensing schemes for relevant metabolic products such as carbon dioxide and ammonia exist and can be used for the development of microsensors.

Once the sensor chemistry and matrix materials have been properly chosen, micro-optodes are easy to manufacture. Accumulation of ammonia yields first to inhibition of cell growth and then to cell death [4].

The required sensor performance in the range of total ammonia concentration (TAC, NH 3 + NH4+) from 1 to mmol L −1 is demanded.

We present an optical ammonia sensing system based on a BF 2-chelated tetraarylazadipyrromethene dye (aza-BODIPY). Keywords: Integrated optics, Optical sensor, Ring resonator, Ammonia sensor 1.

Introduction Ammonia (NH3) concentration measurement has a great importance in many scientific and technological areas. In environmental monitoring, automotive and chemical industry, electronic and optical ammonia sensors are widely used [1].

sors are undergoing development for use in measuring concentrations of ammonia in air at levels relevant to human health [0 to 50 parts per million (ppm)]. A sensor of this type includes an optical fiber that has been modified by replacing a portion of its cladding with a polymer coat that con-tains a dye that reacts reversibly with.

This paper reports on the development and testing of an enclosed portable ammonia sensor, based on near-infrared (NIR) diode lasers and fibre-amplifier enhanced photoacoustic spectroscopy that was designed to address the problem of monitoring ambient agricultural ammonia.

This optical system yielded several innovations: self-contained laser. Read "/a" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. A universal pH indicator is used to fabricate a fiber optic ammonia sensor.

The advantage of this pH indicator is that it exhibits sensitivity to ammonia over a broad wavelength range.

This provides a differential response, with a valley around nm and a peak around nm, which allows us to perform ratiometric measurements. The ratiometric measurements provide not only an enhanced signal.

In this work we reported an optical sensor for the detection of dissolved ammonia through the green synthesis of silver nanoparticles (AgNPs) using aqueous fruit extract of Terminalia chebula.

The formation of AgNPs was monitored by visual observation and the detection of Surface Plasmon Resonance (SPR) peak using UV–Vis spectrophotometer.

Ammonia is a toxic gas with a strong odor that is produced naturally in the biological degradation of organic matters and animal waste. Currently available ammonia sensors are either sensitive but too expensive or affordable but not able for an unattended, long term monitoring.

Searchlight Sensors proposes to develop a low cost, small ammonia monitor with sufficient sensitivity and time. The ammonia analyzer electronics module uses sensitive input electronics and a microprocessor to analyze all of the input signals from the sensors and calculate the free ammonia concentration.

The ISE ammonia analyzer electronics module usually is remotely mounted and can be connected to a control and automation system. PDF | Our contribution starts with a brief overview of the recent state-of-artin the field of 'classical' sensors routinely used in detection of | Find, read and cite all the research you need.

A highly active tannin doped polyaniline-TiO 2 composite ammonia gas sensor was developed and the mechanism behind the gas sensing activity was reported for the first time.

A tanninsulfonic acid doped polyaniline (TANIPANI)-titanium dioxide nanocomposite was synthesized by an in situ polymerization of aniline in the presence of tanninsulfonic acid and titanium dioxide nanoparticles.

In order to fabricate a sensor with good selectivity which can be operated at room temperature, a conductive polymer and a zeolite are mixed together to combine the advantages of these two materials. In this work, we propose the fabrication of poly(p-phenylene)/zeolite composites for use as an ammonia gas sensor.

ZSM-5 zeolite is used as an. 3. Results and Discussion Optical Response. To investigate the effect of BCG doping on the sensitivity of sensor to ammonia gas, the response of four kinds of device were measured, namely, bare glass, glass coated with BCG, glass coated.

As the results show a dependence of the plasmon resonance on the concentration of NH 3, we propose the development of a NH 3 “fluid” optical sensor. It is worth to stress that the analysed system, ammonia in a colloidal silver solution is very simple compared to physiological systems of ammonia in organic fluids (blood or urine).

Among those, optical gas analyzers [4,5,6], catalytic ammonia sensors, metal-oxide gas sensors [7,8], conducting polymer gas detectors [9,10,11], and chemiresistive sensors based on carbon nanomaterials and two-dimensional (2D) transition metal dichalcogenides are used for the detection of gaseous ammonia, with their virtues and shortcomings.

The resulting pH change is measured as light absorbance and is related to the sample ammonia concentration. Ammonia measurements in aqueous solutions are demonstrated with a lower limit of detection of mu.M.

An equation is derived from fundamental concepts to simulate the response of this fiber optic ammonia sensor. 16 references, 6 figures.The gaseous ammonia sensors utilize similar, but different “plastic films” that likewise respond with easily visible color changes at the ammonia concentrations important in gas/air environments.

As in the case with the aquatic ammonia sensors, the gaseous ammonia sensors can also be modified to be a higher or lower sensitivity.Replacement Sensor, Detects Ammonia, Sensor Range 0 to 50 ppm, 1 ppm Resolution Item # Z23 Mfr. Model #