Interferometric detection of dispersed shock waves in small scale diaphragm-less shock tube of 1mm diameter

We have developed a small scale shock tube of 1mm diameter which has a diaphragm-less driver section. The experiment is performed by using our small scale shock tube, where the propagation velocities of the shock waves are measured with a specially designed laser interferometer under several pressure conditions. Helium and CO2 are used as the driver and test gas, respectively. As the results show, we have succeeded in observing weak shock waves in a shock tube of 1mm diameter. The fully or partly dispersed shock waves, which are attributed to the exitation of the vibrational energy of CO2, are also observed at the weak shock region