High-speed broadband slight-off digital holography based on simultaneous two-step Gouy phase shifting interferometry

2016 ◽  
Vol 360 ◽  
pp. 46-51 ◽  
Author(s):  
Xiaowei Lu ◽  
Shixiang Xu ◽  
Jingzhen Li ◽  
Yi Cai ◽  
Yupeng Fan
Keyword(s):  
High Speed ◽  
Digital Holography ◽  
Phase Shifting ◽  
Phase Shifting Interferometry ◽  
Gouy Phase

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.

Incoherent digital holography system utilizing single-shot phase-shifting interferometry

2017 ◽  
Author(s):  
Tatsuki Tahara ◽  
Takeya Kanno ◽  
Yasuhiko Arai ◽  
Takeaki Ozawa
Keyword(s):  
Digital Holography ◽  
Phase Shifting ◽  
Single Shot ◽  
Phase Shifting Interferometry

Determination of Phase Shift by Digital Holography

2019 ◽  
Vol 888 ◽  
pp. 43-46
Author(s):  
Yoshitaka Takahashi ◽  
Masatoshi Saito ◽  
Toru Nakajima ◽  
Masakazu Shingu
Keyword(s):  
Phase Shift ◽  
Noise Reduction ◽  
Digital Holography ◽  
High Accuracy ◽  
Measured Data ◽  
Phase Shifting ◽  
Surface Shape ◽  
Shape Measurement ◽  
Phase Shifting Interferometry

In phase shifting interferometry phase shift is applied by various ways, but applying it with high accuracy, especially by LD current modulation, is not easy. In order to determine the accurate phase shift a new method has been proposed that the value of LD current corresponding to π/2 phase shift can be determined by phase shifting digital holography. The measured data of standard in surface shape measurement were used for calibration, and the obtained value was confirmed to cause noise reduction and improvement of holographic reconstructed images in digital holography.

High-speed parallel phase-shifting digital holography

2011 ◽  
Author(s):  
Takashi Kakue ◽  
Tatsuki Tahara ◽  
Yasuhiro Awatsuji ◽  
Shogo Ura ◽  
Kenzo Nishio ◽  
...  
Keyword(s):  
High Speed ◽  
Digital Holography ◽  
Phase Shifting

Two-step phase-shifting interferometry for self-interference digital holography

2021 ◽  
Author(s):  
Tatsuki Tahara ◽  
Yuichi Kozawa ◽  
Ayumi Ishii ◽  
Koki Wakunami ◽  
Yasuyuki Ichihashi ◽  
...  
Keyword(s):  
Digital Holography ◽  
Phase Shifting ◽  
Phase Shifting Interferometry

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

High-speed 4-D biological microscope based on parallel phase-shifting digital holography

2012 ◽  
Author(s):  
Tatsuki Tahara ◽  
Ryosuke Yonesaka ◽  
Seiji Yamamoto ◽  
Takashi Kakue ◽  
Peng Xia ◽  
...  
Keyword(s):  
High Speed ◽  
Digital Holography ◽  
Phase Shifting
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