Tomio Obokata

Title: Tomio Obokata: Innovator in Acoustic Measurement Technologies

Introduction

Tomio Obokata is a distinguished inventor based in Gunma, Japan. He has made significant contributions to the field of acoustic measurement, holding 2 patents that showcase his innovative approach to technology. His work focuses on enhancing the understanding of sound sources and flow dynamics through advanced measurement techniques.

Latest Patents

Obokata's latest patents include an acoustic measurement device and an acoustic measurement method. The acoustic measurement device utilizes a schlieren optical system where a laser beam is passed through jet flow and its surrounding environment. High-speed sampling is performed using a high-speed photo sensor while displacing measurement points. The resulting data, obtained through sampling, represents the optical path affected by a density gradient generated in an arc shape from the center of the jet flow. This data undergoes a high-speed discrete Fourier transform to decompose it into frequency components that constitute the noise. Subsequently, Abel inversion is applied to data belonging to a specific frequency to derive a density gradient in the radial direction from the center of the jet flow. The visualized density gradient is displayed graphically, allowing for accurate identification of the sound source and the state of the jet flow.

His second patent, the instantaneous flow rate measurement instrument for gaseous fuel injectors, measures the pressure change in a thin tube supplied with gaseous fuel from a compressed gas cylinder. A pressure measuring device captures this change through a small hole in the tube. An extension thin tube is included to mitigate the influence of reflected waves, and a back pressure valve is positioned at the downstream end to uniformly increase pressure in the tube. This setup allows for the accurate measurement of the instantaneous mass flow rate of gaseous fuel injected from the gaseous fuel injector.

Career Highlights

Throughout his career, Obokata has worked with notable institutions such as Gunma University and the Japan Aerospace Exploration Agency. His experience in these organizations has contributed to his expertise in acoustic measurement technologies and their applications in various fields.

Collaborations

Obokata has collaborated with esteemed colleagues, including Mikiya Araki and Seiichi Shiga. Their joint efforts have further advanced the research and development of innovative measurement techniques.

Conclusion

Tomio Obokata's contributions to acoustic measurement technologies reflect his dedication to innovation and research. His patents demonstrate a commitment to enhancing our