R. Peverall
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View article: Fast and sensitive wavelength modulation gas spectroscopy in micro-drilled hollow-core fiber
Fast and sensitive wavelength modulation gas spectroscopy in micro-drilled hollow-core fiber Open
Micro-drilled anti-resonant fiber is demonstrated as a practicable tool for laser-based spectroscopic acetylene sensing, overcoming the slow fiber filling time usually associated with hollow core fiber based methods. Microchannels were dri…
View article: Fast and sensitive wavelength modulation gas spectroscopy in micro-drilled hollow-core fiber
Fast and sensitive wavelength modulation gas spectroscopy in micro-drilled hollow-core fiber Open
Micro-drilled anti-resonant fiber is demonstrated as a practicable tool for laser-based spectroscopic acetylene sensing, overcoming the slow fiber filling time usually associated with hollow core fiber based methods. Microchannels were dri…
View article: Measurements of N<sub>2</sub> <sup>+</sup> ions in an inductively coupled plasma using saturated cavity ringdown spectroscopy
Measurements of N<sub>2</sub> <sup>+</sup> ions in an inductively coupled plasma using saturated cavity ringdown spectroscopy Open
This paper presents a unique study of the bulk plasma characteristics in a low pressure inductively coupled nitrogen plasma. Saturated cavity ringdown spectroscopy (sat-CRDS) has been used to determine the absolute number densities and tra…
View article: Continuous-wave cavity ringdown for high-sensitivity polarimetry and magnetometry measurements
Continuous-wave cavity ringdown for high-sensitivity polarimetry and magnetometry measurements Open
We report the development of a novel variant of cavity ringdown polarimetry using a continuous-wave laser operating at 532 nm for highly precise chiroptical activity and magnetometry measurements. The key methodology of the apparatus relie…
View article: Continuous-Wave Cavity Ring-Down for High-Sensitivity Polarimetry and Magnetometry Measurements
Continuous-Wave Cavity Ring-Down for High-Sensitivity Polarimetry and Magnetometry Measurements Open
We report the development of a novel variant of cavity ring-down polarimetry using a continuous-wave laser operating at 532 nm for highly precise chiroptical activity and magnetometry measurements. The key methodology of the apparatus reli…
View article: Insights into spatial inhomogeneity in an oxygen plasma from cavity ringdown spectroscopy
Insights into spatial inhomogeneity in an oxygen plasma from cavity ringdown spectroscopy Open
Cavity ringdown spectroscopy has been used to investigate the translational and rotational temperatures of the v = 0 and 1 vibrational levels of O 2 (X) in an inductively coupled plasma at 100 mTorr (13.332 Pa) pressure. All rotational sta…
View article: Investigating the effect of nanolime treatment on the drying kinetics of Clipsham limestone
Investigating the effect of nanolime treatment on the drying kinetics of Clipsham limestone Open
Climate change poses an ever-increasing risk to our stone built heritage. Among conservation actions, the use of consolidant products is considered a possible response to this challenge, and the adoption of nanolimes has been widely studie…
View article: Direct monitoring of drying kinetics of building limestones using cavity ring-down spectroscopy
Direct monitoring of drying kinetics of building limestones using cavity ring-down spectroscopy Open
Enchanced understanding of the drying kinetics of building materials is important to explain durability and improve conservation. Cavity ring-down spectroscopy has been demonstrated to be an effective method to investigate drying kinetics,…
View article: Cavity ringdown studies of the E–H transition in an inductively coupled oxygen plasma: comparison of spectroscopic measurements and modelling
Cavity ringdown studies of the E–H transition in an inductively coupled oxygen plasma: comparison of spectroscopic measurements and modelling Open
The absolute number density of ground state oxygen atoms, O( 3 P), present in a 100 mTorr oxygen plasma has been determined as a function of operating power using cavity ringdown spectroscopy (CRDS). The dissociation fraction increases by …
View article: Determining Water Transport Kinetics in Limestone by Dual-Wavelength Cavity Ring-Down Spectroscopy
Determining Water Transport Kinetics in Limestone by Dual-Wavelength Cavity Ring-Down Spectroscopy Open
Water plays a major role in the deterioration of porous building materials such as those widely found in built heritage, influencing many physical, chemical, and biological decay processes. This article details a proof-of-principle study u…
View article: Quantitative measurements of singlet molecular oxygen in a low pressure ICP
Quantitative measurements of singlet molecular oxygen in a low pressure ICP Open
We present measurements of the densities and temperatures (rotational and translational) of the metastable a 1 Δ g ( v = 0) state of O 2 in a cylindrically symmetric RF driven plasma operating in inductive mode at 100 mTorr total pressure …
View article: High performance continuous-wave laser cavity enhanced polarimetry using RF-induced linewidth broadening
High performance continuous-wave laser cavity enhanced polarimetry using RF-induced linewidth broadening Open
We present precise optical rotation measurements of gaseous chiral samples using near-IR continuous-wave cavity-enhanced polarimetry. Optical rotation is determined by comparing cavity ring-down signals for two counter-propagating beams of…
View article: The correlation between breath acetone and blood betahydroxybutyrate in individuals with type 1 diabetes
The correlation between breath acetone and blood betahydroxybutyrate in individuals with type 1 diabetes Open
Ketone testing is an important element of the self-management of illness in type 1 diabetes. The aim of the present study was to see if a breath test for acetone could be used to predict quantitatively the levels of the ketone betahydroxyb…
View article: Accurate real-time F<sub>E</sub>NO expirograms using complementary optical sensors
Accurate real-time F<sub>E</sub>NO expirograms using complementary optical sensors Open
The fraction of exhaled nitric oxide (F E NO) is an important biomarker for the diagnosis and management of asthma and other pulmonary diseases associated with airway inflammation. In this study we report on a novel method for accurate, hi…
View article: Quantitative measurements of oxygen atom and negative ion densities in a low pressure oxygen plasma by cavity ringdown spectroscopy
Quantitative measurements of oxygen atom and negative ion densities in a low pressure oxygen plasma by cavity ringdown spectroscopy Open
In this paper we report measurements of the absolute concentration of ground state oxygen atoms produced in a low pressure (≤100 mTorr) inductively coupled oxygen plasma. These experiments have utilised cavity ringdown spectroscopy, allowi…
View article: Exhaled Breath Isoprene Rises During Hypoglycemia in Type 1 Diabetes
Exhaled Breath Isoprene Rises During Hypoglycemia in Type 1 Diabetes Open
Hypoglycemia and/or fear of hypoglycemia are major challenges for many with type 1 diabetes (T1D), limiting ability to lower glycemia. Given anecdotal reports of domestic pets alerting owners to blood glucose changes, especially hypoglycem…