Abstract
An instantaneous phase shifting deflectometry measurement method is presented and implemented by measuring a time varying deformable mirror with an iPhone ® 6. The instantaneous method is based on multiplexing phase shifted fringe patterns with color, and decomposing them in x and y using Fourier techniques. Along with experimental data showing the capabilities of the instantaneous deflectometry system, a quantitative comparison with the Fourier transform profilometry method, which is a distinct phase measuring method from the phase shifting approach, is presented. Sources of error, nonlinear color-multiplexing induced error correction, and hardware limitations are discussed.
Highlights
In this paper, we demonstrate an instantaneous phase shifting deflectometry measurement using an iPhone R 6, which enables snapshot phase shifting deflectometry data acquisition, measurements in high vibration environments, and a host of other scenarios inaccessible to conventional phase shifting deflectometry techniques
We present the theory of the instantaneous phase shifting measurement and experimental data showing the capabilities of this method
An instantaneous measurement on a phase shifting deflectometry system needs to multiplex twice the amount of information that a similar phase shifting interferometry system would need to multiplex
Summary
We demonstrate an instantaneous phase shifting deflectometry measurement using an iPhone R 6, which enables snapshot phase shifting deflectometry data acquisition, measurements in high vibration environments, and a host of other scenarios inaccessible to conventional phase shifting deflectometry techniques. We show that with a multiplexed display pattern and novel data processing, we can play back a video of time varying events in the measurement path. Similar to the previous deflectometry system developed on a portable device [1], we are limited in performance by the hardware constraints and the processing power of the device. The mobile device allows us to investigate the core ideas and concepts behind the instantaneous measurement and prove that they are robust and well founded. We present the theory of the instantaneous phase shifting measurement and experimental data showing the capabilities of this method. We compare the instantaneous phase shifting method to a different category of deflectometry that leverages Fourier Transform Profilometry (FTP). We discuss sources of error in these measurements, our error correction, and ways to improve the hardware for future applications
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