Dr Michael Lengden

Senior Lecturer

Electronic and Electrical Engineering

Personal statement

Michael Lengden was awarded an M.Phys. degree in physics from the University of Manchester, where he also received the Ph.D. in 2006 for his work on stepwise excitation of atomic and molecular metastable states. 

After spending a year as an applications engineer for Laboratory Impex Systems LTD he joined the Centre for Microsystems and Photonics at the University of Strathclyde as a Research Fellow working on high temperature, high pressure gas composition measurements using tunable diode laser spectroscopy.  In 2010 hw was appointed as a lecturer within the EEE department and is currently applying new techniques in tunable diode laser spectroscopy for concentration and pressure measurements in harsh environments, such as solid oxide fuel cells and aeroengines.


Performance analysis of a novel pyroelectric device for non-dispersive infra-red CO2 detection
Wilson David, Phair John W, Lengden Michael
IEEE Sensors Journal Vol 19, pp. 6006-6011 (2019)
In-situ photoacoustic measurement of soot profiles in laminar flames using a high repetition-rate pulsed fibre laser
Humphries Gordon S, Roy Robert, Black John D, Lengden Michael, Burns Iain S
Applied Physics B: Lasers and Optics Vol 125 (2019)
A new RAM normalized 1f-WMS technique for the measurement of gas parameters in harsh environments and a comparison with 2f/1f
Upadhyay Abhishek, Lengden Michael, Wilson David, Humphries Gordon Samuel, Crayford Andrew P, Pugh Daniel G, Johnson Mark P, Stewart George, Johnstone Walter
IEEE Photonics Journal Vol 10 (2018)
All-optical fiber multi-point photoacoustic spectroscopic gas sensing system
Zhang Congzhe, Yang Yuanhong, Lin Yuechuan, Tan Yanzhen, Lengden Michael, Humphries Gordon, Johnstone Walter, Lut Ho Hoi, Jin Wei
Proceedings 26th International Conference on Optical Fiber Sensors The 26th International Conference on Optical Fibre Sensors (2018)
Azimuthally excited resonators for photoacoustic spectroscopy
Humphries Gordon S, Lengden Michael
Field Laser Applications in Industry and Research (FLAIR) 2018 (2018)
CIDAR : combustion species imaging diagnostics for aero-engine research
Archilla V, Aragón G, Wright P, Ozanyan K, Black J, Polydorides N, McCann H, Lengden M, Burns I, Johnstone W, Polo V, Beltran M, Mauchline I, Walsh D, Johnson M
Aerosol Technology (2018)

more publications


I teach a number of course related to electronics, fundamental physics and optical systems.  I also supervise 3rd year, 4th year and Masters projects based on the development of optical fibre sensors.  My teaching is as follows

  • EE107 Electronic and Electrical Principles (Tutor)
  • 19207 - Electromagnetism (Lecturer)
  • EE473 - Photonic Systems (Lecturer)
  • EE986 - MSc Professional Studies (Tutor)
  • EE979 - Photonics Centre for Doctoral Training (Lecturer and Project Supervisor)
  • 19.496 - 4th Year Undergraduate Individual Projects (Supervisor)
  • 19.900 - MSc Individual Project (Supervisor)

Research interests

My current research interests lie in the application of tunable diode laser spectroscopy (TDLS) for gas sensing applications in industrial process control and harsh environments.  I also work on fundamental spectroscopic measurements of gas species at high temperatures.  I am a PI on an EPSRC First Grant looking at the use of 3D printing for photoacoustic measurements of methane, acetylene and SOx.  I am also a CI on a collaborative EPSRC grant with the Universities of Manchester and Southampton, Rolls-Royce and Shell.  My main focus on this project is the development of TDLS techniques to measure a 2D tomographic distribution of carbon dioxide from aero engine exhausts.

Professional activities

Optics Letters (Journal)
Peer reviewer
Institute of Physics
Visiting lecturer
Technology Strategy Board Funding - Consultancy on 'Compact, Remotely Operated TDLS System for Fuel Cell Diagnostics'
Photonex 10
Invited speaker
Assisting Rolls-Royce Fuel Cell Systems LTD with research in fuel cell technology and commercialisation.

more professional activities


Multi-Path PAS
Lengden, Michael (Principal Investigator)
21-Jan-2019 - 20-Jan-2019
Doctoral Training Partnership 2018-19 University of Strathclyde | Gough, Andrew
Lengden, Michael (Principal Investigator) Johnstone, Walter (Co-investigator) Gough, Andrew (Research Co-investigator)
01-Jan-2018 - 01-Jan-2022
CIDAR for CleanSky 2 (Combustion species Imaging Diagnostics for Aero-engine Research)
Lengden, Michael (Principal Investigator) Burns, Iain (Co-investigator) Johnstone, Walter (Co-investigator)
01-Jan-2018 - 31-Jan-2020
2016 EPSRC Doctoral Prize - Intra-Cavity Photo-acoustic Gas Sensing
Humphries, Gordon Samuel (Principal Investigator) Lengden, Michael (Academic) Burns, Iain (Academic)
The monitoring of trace gases at low concentration is of vital importance across a range of areas (pollutant emission measurement, process control, medical diagnostics). NOx pollution has attracted significant attention, due to the increase in diesel and nitrogen-based bio-fuels usage and the misrepresentation of pollutant levels in the automotive industry. This project will develop a highly sensitive optical sensor targeting nitric oxide (NO), which is an atmospheric pollutant and a pre-cursor to NO2, contributing to significant numbers of UK deaths per annum. Current measurement techniques cannot accurately measure NO and NO2 concentration in the atmosphere at the levels considered dangerous. As its harmful effects become increasingly apparent there is a pressing need for a step change in sensor technology, requiring two orders of magnitude improvement in sensitivity to levels lower than 500 parts per trillion (ppt) and providing improved data for analysis of pollutant species in environmental modelling.
To meet this need we will combine research from Strathclyde and Oxford University to develop a novel gas sensor, integrating the world-leading expertise from both institutions; Strathclyde- considerable expertise in cavity-based optical absorption and photoacoustic techniques for gas detection; Oxford – expertise in an advanced optical technique (optical-feedback-cavity- enhanced absorption spectroscopy - OF-CEAS). The integration of these two techniques has the potential to provide a sensitivity increase of two orders of magnitude, which translates to minimum detection sensitivities of NO and NO2 of 50ppt and 5ppt respectively, well within the range required for practical applications.
01-Jan-2017 - 28-Jan-2018
In-situ Chemical Measurement and Imaging Diagnostics for Energy Process Engineering (Platform Grant)
Johnstone, Walter (Principal Investigator) Burns, Iain (Co-investigator) Lengden, Michael (Co-investigator) Stewart, George (Co-investigator)
01-Jan-2016 - 30-Jan-2021
Vapourised Hydrogen Peroxide Sensor Development and Validation for Large Scale Sterilisation Units
Lengden, Michael (Principal Investigator) Dick, Lindsay (Co-investigator) Halbert, Gavin (Co-investigator) Johnstone, Walter (Co-investigator)
14-Jan-2013 - 14-Jan-2014

more projects


Electronic and Electrical Engineering
Royal College Building

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