A5064883371- Ultrasonics and Acoustic Wave Propagation
- Acoustic Wave Phenomena Research
- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Optical Network Technologies
- Photoacoustic and Ultrasonic Imaging
- Piezoelectric Actuators and Control
- Iterative Learning Control Systems
- Advanced Photonic Communication Systems
- Thermography and Photoacoustic Techniques
- Semiconductor Lasers and Optical Devices
- Photonic Crystal and Fiber Optics
- Welding Techniques and Residual Stresses
- Advanced Measurement and Metrology Techniques
- Metamaterials and Metasurfaces Applications
- Aeroelasticity and Vibration Control
- Noise Effects and Management
- Hearing Loss and Rehabilitation
- Advanced Optical Imaging Technologies
- Additive Manufacturing Materials and Processes
- Underwater Acoustics Research
- Advanced Fiber Laser Technologies
- Advanced machining processes and optimization
- Force Microscopy Techniques and Applications
- Laser Material Processing Techniques
Yuntianhua Group (China)
2024
Hangzhou Dianzi University
2020-2023
Liaocheng University
2022-2023
BOE Technology Group (China)
2023
Shenyang University of Technology
2023
Hebei University of Technology
2021
Gree (China)
2021
Case Western Reserve University
2020
Tiangong University
2020
Shenyang Ligong University
2019
In this paper, a method of rotating scatterers was used to design graded negative refraction index phononic crystal (GNRI PC) plate lens. The present lens contains the periodic perforated three-fan holes as in epoxy matrix. For given rotation angle scatterer, would result variation second A0 band dispersion curve, which is related specific index. Based on Snell's law, calculated by utilizing equifrequency contour and wave vector space for different angle. Then, designed distribution...
The propagation of ultrashort sound pulses in water has been studied by using the picosecond ultrasonic technique and a pulse time-of-flight for measuring depths deep channels Si-based nanostructure was demonstrated. were generated when light absorbed metal transducer film detected time-delayed probe pulse. First, attenuation velocity frequency 4.8 GHz measured through an analysis Brillouin oscillations reflectivity light. Measurements at frequencies up to about 11 made sending across thin...
The hysteresis characteristic of piezoelectric micro-positioning platforms seriously affects its positioning accuracy in precision positioning. It is important to design an effective model and control scheme. Based on the analysis Duhem model, this paper proposes divide curve into two parts, step-up section step-down section, identify parameters, respectively, a hybrid intelligent optimization algorithm based artificial fish swarm bat proposed. simulation experiment verified that error...
The hysteresis nonlinearity and rate dependence of piezoelectric actuators seriously affect their positioning accuracy in precise positioning. Proper compensation needs to be given improve the actuator. In this paper, static characteristics are described by improving BP neural network model based on adaptive particle swarm optimization algorithm, PI is used as factor extended space method realize multi-valued mapping nonlinearity. And input three types voltage signals, compare analyze...
A thorough analysis of the system model for complex-valued optical double-sideband (DSB) transmission with carrier-assisted differential detection (CADD) receiver under influence laser phase noise and fiber chromatic dispersion (CD) is presented. It shown that interaction CD leads to phenomenon phase-to-amplitude (P2A) equalization-enhanced (EEPN). The achievable performance DSB CADD EEPN P2A estimated by a closed-form expression, it verified simulation results show an inaccuracy less than 1...
A multi-direction bending sensor based on the 18-core photonic crystal fiber (PCF) is demonstrated in this paper. The design of discussed theoretically and experimentally. PCF serves as laser gain medium sensing simultaneously sensor. operating wavelength proposed about 1032.32 nm. CMOS image capture system used to acquire distribution supermodes laser. Based normalized intensity supermodes, six directions can be measured. also shows ability measure radius within 0.11 m. Then, thermal...
One of the key questions in generation monodisperse droplets is how to eliminate satellite droplets. This paper investigates formation and elimination during deionized water based on a piezoelectric method. We estimated effects two crucial parameters—the pulse frequency for driving transducer (PZT) tube volume flow rate pumping liquid—on expected size. It was found that by adjusting harmonize with rate, can be eliminated through their coalescence subsequent mother An increase tuning led...
We have fabricated edge-emitting GaAs/AlGaAs quantum well lasers in which the outer cladding layers been replaced by multilayer Bragg reflectors. The reflectance peak spans intrinsic spontaneous emission spectrum of wells and there are no allowed vertical cavity modes within this spectrum. Compared with an equivalent alloy structure threshold current these is reduced 25%. This due to a reduction recombination rather than increase internal efficiency. Studies normal sample surface show that...
The propagation of ultra-short sound pulses in water is studied by using the picosecond ultrasonic technique. A pulse generated when light absorbed a metal transducer film deposited onto substrate. propagates across thin layer and then reflected back to surface at which it was generated. efficiency optoacoustic detection enhanced through use resonant optical cavity. We show that variation shape returning with distance agrees calculated attenuation has been measured lower frequencies.
We demonstrate high sensitivity fiber refractive index (RI) sensor based on asymmetric supermode interferences in tapered four core (TFCF). To make TFCF-based RI sensors, the whitelight was launched into any one of cores to define excitation orientation and is called a vertex-core scheme. When four-core (FCF) gradually tapered, gathered closer closer. Originally, power coupling occurred between its two neighboring first these three are grouped produce supermodes. Subsequently, fourth...
To realize the frequency tuning of phononic crystals (PCs) and functional design tunable PCs, acoustic components with more flexible working frequencies are manufactured to meet various requirements engineering applications. We proposed a combined method that combines change Young’s modulus shape memory alloy rotation scatterer. The band structure transmission spectra were calculated using finite element method. analyzed effect fill rate viscosity matrix on studied regulation law dual mode....
In this paper, a polarization demultiplexing scheme based on Square-root cubature Kalman filter (SCKF) is proposed, which can compensate mode dispersion in the frequency domain and track rotation of state (RSOP) time domain. The performance SCKF has verified by 28 GBaud PDM-16QAM system. simulation results demonstrate that proposed handle ultra-fast RSOP up to 55 Mrad/s, still compensation capability about 90 ps for different group delay (DGD) under extreme variation 15 Mrad/s. It achieves...
The improper discharge of industrial wastewater causes severe environmental pollution and the textile industry’s dye usage contributes significantly to pollution. Hence, an effective method for removing harmful substance methylene blue (MB) from is proposed. This adopts a three-dimensional graphene composite material based on manganese dioxide (MnO2), named polyurethane@ reduced oxide@ MnO2 (PU@RGO@MnO2). First, prepared with hydrazine hydrate as reducing agent polyurethane framework....
We report an experiment in which optical cavity is employed to enhance picosecond ultrasonic signals. The a Fabry-Perot interferometer formed by distributed Bragg reflector (DBR) and the sample be studied. By adjusting thickness of air gap between DBR sample, can tuned most sensitive sound-induced surface displacement sample. It demonstrated that presence cavity, efficiency both generation detection sound improved. furthermore show this technique provides efficient method detecting materials...
A study on burst-mode 500 ps fiber laser ablation in 304 stainless steel is presented. pulsed with operation was employed as the light source our processing system. Under different parameters, results were observed and compared scanning electron microscope photos. As burst energy 8 mJ pulse repetition rate 2 MHz, a relatively good hole quality obtained. The superiority of also discussed at end this article.
The propagation of ultra-short sound pulses in water has been studied using an ultrafast opto-acoustic technique. A pulse time-of-flight technique for measuring the depths deep channels Si-based nanostructures was demonstrated. We report these proof-of-concept ultrasonic experiments how spatial profile information can be acquired, where propagate down narrow patterned nanostructures. have able to detect acoustic echoes propagating along a channel as 35 nm with depth width ratios exceeding 10:1.