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.


Photoacoustic trace gas sensing using a miniature 3D printed gas cell
Bauer Ralf, Stewart George, Johnstone Walter, Lengden Michael
Photon14 (2014)
A 3D-printed miniature gas cell for photoacoustic spectroscopy of trace gases
Bauer Ralf, Stewart George, Johnstone Walter, Boyd Euan, Lengden Michael
Optics Letters Vol 39, pp. 4796-4799 (2014)
Near IR tunable diode laser spectroscopy for aero engine research
Benoy Thomas, Lengden Michael, Armstrong Ian, Wilson David, Stewart George, Johnstone Walter
FLAIR 2014 - Field Laser Applications in Industry and Research (2014)
In-situ measurement of combustion produced CO2 in the 2μm region, within a jet engine exhaust plume
Wilson David, Armstrong Ian, Lengden Michael, Johnstone Walter
FLAIR 2014 - Field Laser Applications in Industry and Research (2014)
A miniaturised 3D printed resonant photoacoustic cell for trace gas sensing
Bauer Ralf, Stewart George, Johnstone Walter, Lengden Michael
FLAIR 2014 - Field Laser Applications in Industry and Research (2014)
Development of a continuous-wave cavity ring down spectrometer for combustion diagnostics
Humphries Gordon Samuel, Burns Iain, Lengden Michael
FLAIR 2014 - Field Laser Applications in Industry and Research (2014)

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

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

more professional activities


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.
Period 01-Mar-2017 - 28-Feb-2018
CIDAR for CleanSky 2 (Combustion species Imaging Diagnostics for Aero-engine Research)
Lengden, Michael (Principal Investigator) Burns, Iain (Co-investigator) Johnstone, Walter (Co-investigator)
Period 01-Mar-2018 - 31-Aug-2020
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)
Period 01-Oct-2016 - 30-Sep-2021
Epsrc Doctoral Training Grant | Humphries, Gordon Samuel
Lengden, Michael (Principal Investigator) Burns, Iain (Co-investigator) Humphries, Gordon Samuel (Research Co-investigator)
Period 01-Oct-2012 - 05-Jun-2017
Fibre Laser Imaging For Gas Turbine Exhaust Species (FLITES) | Benoy, Thomas
Johnstone, Walter (Principal Investigator) Lengden, Michael (Co-investigator)
Period 01-Nov-2012 - 19-Jan-2017
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)
Period 14-Oct-2013 - 14-Mar-2014

more projects


Electronic and Electrical Engineering
Royal College Building

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