THERAD: Novel measurement and sensing technologies for thermal radiation of unwanted fires

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Unpublished picture, A. Mityakov

THERAD project is an Academy of Finland funded consortium project which is a part of the RADDESS program granted in Nov. 2017.

ABSTRACT

THERAD research aims at creating a new fire detection and measurement technology by combining gradient heat flux sensors (GHFS) with novel spectrally selective coatings into robust, low-weight and low-cost thermal radiation sensors. GHFS are based on the transverse Seebeck effect in anisotropic materials and generate thermopower proportional to the heat flux. First we will design the coating systems by computing the localized surface plasmon resonances on low-bandcap semiconductor particles. For spherical particles, we will use Mie theory for the absorption and scattering cross sections, followed by Monte Carlo simulations for the coating transmittance. The boundary conditions for the design calculations will be taken from narrow-band radiation solution (RADCAL) of combustion products. Next, we will investigate the suitability of sol-gel and pulsed electric current sintering (PECS) manufacturing techniques for making the micro- and nanoparticle inclusions in thin coating layers to implement infrared bandpass filters. Finally, coated sensors will be optimized and calibrated for the use in flame detection and measurement problems, and validated using experimental (ISO 5660) and computational methods.

RESEARCH PARTNERS

There are four research groups involved in this project as followings:

NEWS AND EVENTS

  • Kick-off meeting: Feb. 15th, 2018, 12-16. Meeting room F138, Otakaari 3, Espoo.
  • Monthly group meetings are held every month.
  • October group meeting was held on Friday Oct. 19th in the Dep. of Chemical Eng. Beside the project discussions, attendees had a laboratory tour and got familiar with the facilities of the research group of Prof. Simo-Pekka Hannula.

PUBLICATIONS AND PRESENTATIONS

  • Isojärvi T., Bordbar H., Hostikka S., “Spectrally resolved calculation of thermal radiation penetration into liquid n-heptane in pool fires”, International Journal of Heat and Mass Transfer, Vol 127, pp. 1101–1109, (2018). Link.
  • Isojärvi T., Bordbar H., Hostikka S., “Radiative heat transfer in pool fires”, Nordic Fire and Safety Days 2018, June 2018, Trondheim, Norway.
  • Isojärvi T., Bordbar H., Hostikka S., “Calculation of radiation transmittance through n-heptane in a pool fire”, European symposium on fire safety sciences (ESFSS2018), Sep. 2018, Nancy, France.
  • Conley K., Thakore V., Ala-Nissila T., Plasmonically Enhanced Spectrally-Sensitive Coatings for Gradient Heat Flux Sensors, 2018 Progress In Electromagnetics Research Symposium (PIERS | Toyama), Japan, 1-4 August, 2018.

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