T. Nakamiya, Y. Sonoda
Shin-Giken Co., Ltd., Kumamoto, Japan
Keywords: Laser diffraction, Audio sound, Ultra sound, Sound field, Visualization
A microphone is commonly used as a representative method for detecting sound. Although this method has a history of over 100 years, the basic principle of using a diaphragm has not changed. This study provides a method for directly detecting sound (including ultrasound) using a laser beam, collectively referred to as an optical wave microphone. Features: 1. It can be configured without placing solid objects (sensor parts) at the measurement point. 2. All sound and ultrasound receiving parts can be made optical (non-electrical). 3. It can be used in both air and water. 4. Using a long-distance laser beam sound wave antenna, a wide-area acoustic security system can be constructed. 5. Unlike conventional microphones, it can determine the direction of sound intrusion and measure sound separation for each direction. 6. It has the potential to develop methods for extracting sound information from general light. Additionally, it has many features compared to traditional microphones. The poster will specifically explain the principles, basic structure, detection methods, advantages and features, and application examples of optical wave microphones.