scholarly journals High-speed imaging of sound using parallel phase-shifting interferometry

2016 ◽  
Vol 24 (12) ◽  
pp. 12922 ◽  
Author(s):  
Kenji Ishikawa ◽  
Kohei Yatabe ◽  
Nachanant Chitanont ◽  
Yusuke Ikeda ◽  
Yasuhiro Oikawa ◽  
...  
Keyword(s):  
High Speed ◽  
Phase Shifting ◽  
High Speed Imaging ◽  
Phase Shifting Interferometry

High-Speed Imaging of Gas Flow by Parallel Phase-Shifting Digital Holography

2011 ◽  
Author(s):  
Takashi Kakue ◽  
Tatsuki Tahara ◽  
Yuki Shimozato ◽  
Kenichi Ito ◽  
Yasuhiro Awatsuji ◽  
...  
Keyword(s):  
High Speed ◽  
Digital Holography ◽  
Gas Flow ◽  
Image Sensor ◽  
Phase Shifting ◽  
Frame Rate ◽  
Quarter Wave Plate ◽  
Single Shot ◽  
High Speed Imaging ◽  
Phase Shifting Interferometry

We succeeded in high-speed imaging of gas flow by means of parallel phase-shifting digital holography. This technique is capable of capturing three-dimensional (3-D) information of object and carrying out phase-shifting interferometry with a single-shot exposure because the interference fringe images in which the information of multiple phase-shifted holograms is spatially multiplexed are simultaneously recorded. We constructed a high-speed phase-shifting digital holography system by employing a quarter-wave plate and a high-speed camera. The image sensor of the camera has an anisotropic polarization-detecting function pixel by pixel. Each pixel of the polarization-detecting function corresponds to each pixel of the image sensor. The phase retardation of the reference wave is determined by the direction of the polarization axis of the each pixel. A compressed gas flow sprayed from a nozzle was set as an object. We attained the reconstructed images of phase variation caused by the gas flow. We also succeeded in phase imaging at the rate of 180,000 frames per second when the number of pixels of the captured image was 128 × 128. Additionally, we also obtained temporal subtraction images of the reconstructed images. The achieved frame rate was the fastest among not only phase-shifting digital holography but also digital holography and phase-shifting interferometry which have been ever reported, for our knowledge. It is expected that parallel phase-shifting digital holography and the constructed system can contribute to 3-D moving picture measurement of dynamically moving objects such as particle flows, shock waves, mechanical vibration, and so on.

scholarly journals Experimental visualization of aerodynamic sound sources using parallel phase-shifting interferometry

2020 ◽  
Vol 61 (9) ◽  
Author(s):  
Risako Tanigawa ◽  
Kohei Yatabe ◽  
Yasuhiro Oikawa
Keyword(s):  
Optical Method ◽  
High Speed ◽  
Near Field ◽  
Phase Shifting ◽  
Flat Plates ◽  
Noise Sources ◽  
Sound Sources ◽  
Aerodynamic Sound ◽  
Phase Shifting Interferometry ◽  
Pressure Fields

Abstract Aerodynamic sound is one of the causes of noise in high-speed trains, automobiles, and wind turbines. To investigate the characteristics of aerodynamic sound generation, measurements around the sound sources are required. Aerodynamic sound is typically measured using microphones. However, microphones cannot capture the near-field of aerodynamic sound because they become new noise sources inside the air flow. To observe the aerodynamic sound near-field, we performed two-dimensional visualization of aerodynamic sound using an optical method. The optical method used in this research, parallel phase-shifting interferometry (PPSI), can detect the pressure within the measurement area as variations of the phase of light. PPSI can therefore visualize the pressure fields. We visualized both the sound pressure and flow components of the sound generated by flow around a square cylinder and flat plates. The visualized pressure fields are provided as animations in the online resources. Analysis of the sound and flow component time variations confirmed the correlations between them. Graphic abstract

Simultaneous imaging of flow and sound using high-speed parallel phase-shifting interferometry

2018 ◽  
Vol 43 (5) ◽  
pp. 991 ◽  
Author(s):  
Kenji Ishikawa ◽  
Risako Tanigawa ◽  
Kohei Yatabe ◽  
Yasuhiro Oikawa ◽  
Takashi Onuma ◽  
...  
Keyword(s):  
High Speed ◽  
Phase Shifting ◽  
Simultaneous Imaging ◽  
Phase Shifting Interferometry

scholarly journals High speed phase shifting interferometry using injection locking of the laser frequency to the resonant modes of a confocal Fabry-Perot cavity

2009 ◽  
Vol 17 (3) ◽  
pp. 1442 ◽  
Author(s):  
Chu-Shik Kang ◽  
Jong-Ahn Kim ◽  
Tae Bong Eom ◽  
Roma Jang ◽  
Hae Yong Park ◽  
...  
Keyword(s):  
High Speed ◽  
Laser Frequency ◽  
Injection Locking ◽  
Phase Shifting ◽  
Phase Shifting Interferometry ◽  
Resonant Modes ◽  
Fabry Perot

High-speed phase-shifting interferometry using triangular prism for time-resolved temperature measurement

2015 ◽  
Vol 54 (20) ◽  
pp. 6297 ◽  
Author(s):  
Eita Shoji ◽  
Atsuki Komiya ◽  
Junnosuke Okajima ◽  
Hiroshi Kawamura ◽  
Shigenao Maruyama
Keyword(s):  
Temperature Measurement ◽  
High Speed ◽  
Phase Shifting ◽  
Triangular Prism ◽  
Time Resolved ◽  
Phase Shifting Interferometry
Sign in / Sign up

Export Citation Format

Share Document