微小重力下におけるろ紙のふく射着火現象に及ぼす照射波長の影響(熱工学,内燃機関,動力など)

The objective of this work is to provide information about the details of the effect of light wavelength on radiative ignition of solid material. An experiment of radiative ignition has been performed in microgravity to determine the events occurring in ignition processes in a quiescent atmosphere. Filter papers were irradiated by infrared radiation (CO2 laser 10.6 μm) or near infrared radiation (Diode laser, 800.1 nm). The ignition delay was measured for various experimental conditions, and the density change of gas phase before ignition were observed by a Mach-Zehnder interferometer. The results showed that the ignition delay time of the infrared radiation was much shorter than that of near infrared radiation, and it was observed that the difference of light wavelength of radiations had a strong effect on the ignition process. It was suggested that one of main reasons to give the difference was the difference of radiative absorption in gas phase as well as the difference of absorptivity by solid surface according to the Mach-Zehnder interferometer.