Publications by authors named "Zeheng Zhang"
Phase noise is one of the main obstacles to achieve high spatial resolution, high precision, and large measurement range in φ-OFDR. Here, we proposed a complex-domain denoising method to achieve unwrapping of phase signals. In this method, the wrapped phase was used to construct a complex signal, and then both real and imaginary parts are denoised by using a wavelet packet.
View Article and Find Full Text PDFArticle Synopsis
- - Optical liquid-level sensors offer a safer alternative to traditional electrical sensors, making them increasingly popular in industrial and medical applications.
- - A new distributed sensor using optical frequency domain reflectometry with no-core fiber has been developed, achieving impressive metrics: 0.1 mm resolution, ±15 μm stability, and a measurement range of 175 mm.
- - This technology promises to be valuable in smart industry and extreme environments, with potential for further extension up to 1.25 m while maintaining a signal-to-noise ratio of 10 dB.
Polarization maintaining (PM) fibers can be used for distributed force/pressure sensing in which the birefringence axis of the PM fiber should preferably be oriented 45° from the direction of the force/pressure for the maximum sensitivity. However, it is a challenge to achieve such 45° axis orientation for a long length of PM fiber in practice. In this paper, we report the development of what we believe the first equipment and process for making PM fiber based sensing tapes, capable of automatically adjusting the fiber axis orientation 45° with respect to the tape surface.
View Article and Find Full Text PDFPurpose: To evaluate the safety and efficacy of a system aiming to correct scoliosis called "electromagnetically controlled shape-memory alloy rods" (EC-SMAR) used in a rabbit model.
Methods: We heat-treated shape-memory alloy (SMA) rods to achieve a transition temperature between 34 and 47 °C and a C-shape austenite phase. We then developed a water-cooled generator capable of generating an alternating magnetic field (100 kHz) for induction heating.