LGS Temperature – a new method to measure the temperature

The solution is based on laser-induced grating spectroscopy, a novel optical technique based on resonant four-waving mixing for non-intrusive measurements of gas temperatures (reference1, 2). Compared with other optical temperature measurement techniques, it is relatively simple, but still able to accurately measure temperature in a wide range.

LGS Temperature

Transmitter probe of LGS temperature

LGS temperature can be used to characterize all heat exchange processes. Particularly, it has been proven to be an ideal tool to characterize the cooling effect induced by fuel injection for direct fuel injection internal combustion engines.

LGS Temperature  crank angle

LGS temperature used to measure in-cylinder temperature of a Direct Injection Spark Ignition engine under various conditions. Courtesy of Physics Department, Oxford University, UK

Dantec Dynamics offers a complete solution for LGS temperature measurement, including a compact and integrated probe, advanced signal processor together with user friendly software. With this solution and our decades of experience in flow optical diagnostics, flow temperature can be measured easier than ever.

Key benefits

  • A complete solution for in-situ, real time temperature measurement
  • No calibration needed
  • Proven accuracy and high resolution
  • Compact and integrated solution, easy to use
  • Synchronization with engine supported


[1] J. Kiefer and P. Ewart, Laser diagnostics and minor species detection in combustion using resonant four-waving mixing, Progress in Energy and Combustion Science 37, 525-564, 2011
[2] B. Williams, M. Edwards, R. Stone, J. Williams and P. Ewart, High precision in-cylinder gas thermometry using laser induced gratings: Quantitative measurement of evaporative cooling with gasoline/alcohol blends in a GDI optical engine, Combustion and Flame 161, 270-279, 2014