Experimental setup for fast VIS-NIR spectroscopy measurements in deflagrations

Studying radiative properties of molecules, for instance to identify species during fast phenomena, is not always simple because fast detection systems are required. With the experimental setup presented, high-resolution spectra in the visible (VIS) and the near infrared (NIR) range can be recorded at high frame rates for gaseous deflagrations. For such phenomenon, the flame front spreads in a few tens of meters per second. In the setup, the deflagrations are performed in a stainless steel cylindrical combustion chamber, which includes a sapphire window and incorporates a high-speed piezoelectric sensor to measure pressure variations. The emitted radiation is focused into the slit of a monochromator, and at its exit slit a camera records spectra in real time.