A5078326907- Spectroscopy and Laser Applications
- Surface Roughness and Optical Measurements
- Atmospheric and Environmental Gas Dynamics
- Virtual Reality Applications and Impacts
- Design Education and Practice
- Advanced Fiber Laser Technologies
- Asphalt Pavement Performance Evaluation
- Laser Design and Applications
- Semiconductor Lasers and Optical Devices
- Innovative Human-Technology Interaction
- Calibration and Measurement Techniques
- Data Visualization and Analytics
- Gas Sensing Nanomaterials and Sensors
- Atmospheric Ozone and Climate
- Infrastructure Maintenance and Monitoring
- Photonic and Optical Devices
- nanoparticles nucleation surface interactions
Cranfield University
2016-2023
Material Sciences (United States)
1982
We present a sensor for gas detection utilising an integrating sphere and interband cascade laser tunable diode absorption spectroscopy (TDLAS). Measurements were made of the methane line at 3313 nm using with effective pathlength 70.1 cm. Gas concentrations estimated from normalised spectra fitting to 7 lines within scan. Testing showed that measurements linear in synthetic air range 0–50 ppm. With averaging time 20 s, noise-equivalent concentration was 180 ppb (1σ). The system requires...
Detection of methane at 3.3μm using a DFB Interband Cascade Laser and gold coated integrating sphere is performed. A 10cm diameter with effective path length 54.5cm was adapted for use as gas cell. comparison between this system one 25cm single-pass cell made direct TDLS concentrations 0 1000 ppm. Initial investigations suggest limit detection 1.0ppm the 2.2ppm single pass The has potential applications in challenging or industrial environments subject to high levels vibration.
We present a system for identifying conceptual shifts between visual categories, which will form the basis co-creative drawing to help users draw more creative sketches. The recognizes human sketches and matches them structurally similar from categories they do not belong. This would allow produce an ambiguous sketch that blends features both categories.
We present the development of an external cavity Bragg grating stabilized laser for tunable diode spectroscopy (TDLS). Our design uses a planar integrated silica-on-silicon platform incorporating custom written as wavelength-selective element cavity. have developed prototype singlemode at 1651 nm and performed detailed characterization its performance purpose spectroscopic measurement methane this wavelength using 25 cm path-length single-pass cell. Mode hop-free tuning 0.13 has been...
When used as samples cells for optical absorbance measurements, integrating spheres offer increased pathlengths compared to single pass combined with tolerance misalignment. This makes them attractive during alignment of instruments and in challenging environments subject vibration. However, can suffer problems when sensitive / or accurate measurement. We present our work date address these issues high resolution laser spectroscopy. Firstly, interference effects include both random speckle...
Laser standoff Instrumentation has been developed to measure surface reflectivity of UV-aged bitumen at four specific mid-IR wavelengths. Preliminary measurements reveal heterogeneity across individual samples and an overall trend with age.