共同研究・競争的資金等の研究課題

This research work focused on the development of non-intrusive sensing technique using coherent anti-Stokes Raman scattering (CARS) in order to investigate spatiotemporal fine structure of ion gas flow in micro gas device. Carbon dioxide and nitrogen were selected as gas phase. It was observed that the relationship between CARS intensity from each gas and mixture ratio had a form similar to quadratic function, which is consistent with the CARS theory. Measurements of mixture ratio in channel flow were performed at ten measurement point. The present sensing technique has an ability to measure a change in mixture ratio in the downstream region, which was confirmed by the theoretical mixing process. It can be concluded that non-intrusive measurement of gas concentration in micro device was achieved by Raman scattering, which means that fluorescent particles and dye are no longer required.

This research work focused on the development of non-intrusive sensing technique of thermofluid dynamics in order to investigate molecular absorption and formation mechanism of ion layer in the vicinity of interface between different phases. The following techniques were proposed in the work: (i) non-intrusive sensing for spatiotemporal distribution of temperature in microchannel by two-wavelength spontaneous Raman imaging, (ii) non-intrusive simultaneous sensing for spatiotemporal distribution of velocity and temperature in microchannel by two-wavelength spontaneous Raman imaging, (iii) non-intrusive sensing for molecule concentration distribution in the vicinity of liquid-solid interface by total internal reflection spontaneous Raman imaging and (iv) non-intrusive sensing for ion concentration distribution in microchannel by coherent anti-Stokes Raman scattering. It can be concluded that non-intrusive measurements of velocity, temperature and concentration were achieved by Raman scattering, which means that fluorescent particles and dye are no longer required.