This inventor holds 2 USPTO granted patents and 1 EPO patent. Top assignees: Gunma University, Japan Aerospace Exploration Agency. Active years: 2010-2012.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile
Company Filing History:
2 out of 115 
1 out of 256 
Years Active: 2010-2012
Title: Seiichi Shiga: Innovator in Acoustic Measurement Technologies
Introduction
Seiichi Shiga is a notable 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 jet flows and gaseous fuel injection systems.
Latest Patents
One of Shiga's latest patents is an acoustic measurement device and method. This invention utilizes a schlieren optical system where a laser beam is passed through the jet flow and its surrounding environment. High-speed sampling is performed using a high-speed photo sensor while displacing measurement points. The resulting data represents the optical path altered 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 assessment of the sound source's position and the state of the jet flow.
Another significant patent is the instantaneous flow rate measurement instrument for gaseous fuel injectors. This device supplies gaseous fuel from a compressed gas cylinder into a measuring portion thin tube. The pressure change in the tube is measured by a pressure measuring device through a small hole in the thin 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 the pressure in the tube. This setup allows for accurate measurement of the instantaneous mass flow rate of gaseous fuel injected from the gaseous fuel injector.
Career Highlights
Seiichi Shiga has worked with prestigious 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 fuel injection systems.
Collaborations
Some of his notable coworkers include Tomio Obokata and Mikiya Araki. Their collaboration has likely fostered innovative ideas and advancements in their respective fields.
Conclusion
Seiichi Shiga's contributions to acoustic measurement technologies and gaseous fuel injection systems highlight his innovative spirit and dedication to advancing engineering solutions. His patents reflect a deep understanding of complex
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile