In this paper, we present some preliminary results on a new terahertz-Time
Domain Spectroscopy (THz-TDS) experiment. After a general introduction abou
t the interest of the THz range, we particularly discuss some advantages of
this technique for combustion applications and compare it with the classic
al linear and nonlinear optical techniques. The set-up developed in our lab
oratory is described and some results on NO displayed. (C) 2001 Academie de
s sciences/Editions scientitiques et medicales Elsevier SAS.