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Prof. Walter Johnstone is the Research Professor of Photonic Systems in the Department of Electronic and Electrical Engineering with responsibility only for research leadership and implementation. Prior to his current status, he held senior management positions as Deputy Head then Head of Electronic and Electrical Engineering (2006-11) followed by appointment to the post of Vice Dean (Research) of the Faculty of Engineering (2011-16). He is also a founding director of the Spin-out Company, OptoSci Ltd.
Professor Johnstone is Head of the Photonic Systems research team and his work has led to more than 200 technical publications and several patent applications. Recent research in laser spectroscopy applications focusses on accurate measurement of gas concentration, pressure and temperature in extreme environments, such as in the combustion zones and exhaust plumes of aero (gas turbine) engines at high temperature and high gas velocity. As well as carrying out basic research, his group is involved in the engineering of such systems for in situ industrial deployment, and sensing systems based on his research are now commercially available.
The Photonic Systems Research team works closely with industry and currently collaborate in the area of spectroscopic gas measurements with Rolls-Royce, Rolls-Royce Fuels Cell Systems, Shell, OptoSci Ltd. and M Squared Lasers, working on advances in gas measurement technologies for harsh, high temperature environments, such as gas turbine (aero) engines and fuel cells.
Expertise & Capabilities
Laser spectroscopy, in particular tunable diode laser spectroscopy, and its applications to accurate measurements of gas concentration, temperature and pressure in harsh, particularly high temperature, envoronments such as fuels cells and gas turbine (aero) engines at temperatures up to 1000oC.
Fundamental principles of Optics and Photonics, optical telecommunication systems, photonics systems and its applications in general.
Academic / Professional qualifications
PhD, BSc (Hons), FIET, CEng, F.Inst.P, CPhys
Expertise related to UN Sustainable Development Goals
In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This person’s work contributes towards the following SDG(s):
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Collaborations and top research areas from the last five years
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1/10/21 → 1/11/25
Project: Research Studentship Case - Internally allocated
Fu, Y., Zhang, R., Xia, J., Gough, A., Clark, S., Upadhyay, A., Enemali, G., Armstrong, I., Ahmed, I., Pourkashanian, M., Wright, P., Ozanyan, K., Lengden, M., Johnstone, W., Polydorides, N., McCann, H. & Liu, C., 27 Oct 2023, (E-pub ahead of print) In: IEEE Transactions on Instrumentation and Measurement. 9 p.
Research output: Contribution to journal › Article › peer-reviewOpen AccessFile5 Downloads (Pure)
Zhang, R., Xia, J., Ahmed, I., Gough, A., Armstrong, I., Upadhyay, A., Fu, Y., Enemali, G., Lengden, M., Johnstone, W., Wright, P., Ozanyan, K., Pourkashanian, M., McCann, H. & Liu, C., 23 Aug 2023, (E-pub ahead of print) In: Sensors and Actuators B: Chemical. 15 p., 134500.
Research output: Contribution to journal › Article › peer-reviewOpen AccessFile
Demonstration of calibration-free WMS measurement of gas parameters with in-situ real-time characterization of laser parameters using cw-DFB-QCL, VCSEL and DFB lasers
Measurement of CO2 Concentration and Temperature in an Aero Engine Exhaust Plume Using Wavelength Modulation Spectroscopy
Walter Johnstone (Member)May 2010 → Dec 2012
Activity: Membership types › Membership of committee
Walter Johnstone (Editorial board member)Jan 2010 → Dec 2013
Activity: Publication peer-review and editorial work types › Editorial board member