This research was attempted in order to suggest th result, which can improve the ultrasonically longitudinal waves as supplying N2 gas, in a assumed chamber of high pressure gas. Experimental device was autonomously developed by PZT and matching layer, and experimental method could be controlled by variable signals with 3 components from ±2 kHz in based on 70 kHz of transferred frequency. The result of can verify a energy performance which was increased about 4% higher than obtained acoustic energies at �and �, and matching layer, where sensor was combined, was generated by performance which can increase the accuracy of measurement at gas fuels from chemical wood characteristics.