This article addresses the problem that installation errors in the encoder during the detection process result in the generation of installation angular errors. It analyzes the relationship of installation angular errors, rotation angles, and measurement errors. It establishes a model for determining the installation angular errors caused by misalignment in the non-concentric detection system. Through experiments, the impact of three different levels of installation angular errors, namely$ 0^{\circ}\;\mathit{\mathrm{to}}\;0.002^{\circ} $, $ 0.1^{\circ}\;\mathrm{to}\;0.102^{\circ} $, and $ 0.2^{\circ}\;\mathrm{to}\;0.202^{\circ} $, on the static and dynamic accuracy of the detected encoder was analyzed. Three distinct experimental results were obtained. The experimental findings indicate that during encoder detection, initial controllable installation errors within the specified range meet the technical specifications. However, exceeding this safe range of installation errors would cause the deviation of the encoder's detection performance from the standard. The conclusions drawn from the experiments hold importance in enhancing the accuracy and reliability of encoder detection technology. They also provide valuable reference points for future research aimed at improving encoder detection accuracy.

By testing the probe of the liver function reserve analyzer, the accuracy of its detection function is evaluated to ensure the accuracy and validity of the detection results of the liver function reserve analyzer. Using the probe's detection sensitivity to the concentration of indocyanine green drugs, detect different concentrations of indocyanine green after dilution and compare the detection results with the actual concentration of indocyanine green to verify the accuracy of the probe.After comparison, it is found that under ideal test conditions, the detection accuracy error of the probe within 2 years is less than 0.5%, the detection accuracy error of the probe using 2-4 years is about 1%, and the detection accuracy error of the probe using morethan 4 years is greater than 2%. In order to ensure the accuracy and validity of the test results of the liver function reserve analyzer, the probe used within 2 years should be tested 1-2 times a year, the probe used for 2-4 years should be tested 2-4 times a year, and the probe used for more than 4 years The probe should be tested once a month or directly replaced with a new probe.

In this paper, based on the numerical model of terahertz wave generated by two-color laser plasma in air, we studied the variation of terahertz wave generated from two-color laser field with different laser parameters, so as to obtain the strongest terahertz wave radiation energy. The simulation results show that the laser wavelength, relative phase, and laser pulse width could regulate the transient current and the radiated THz energy. In addition, we also explained the physical mechanism of terahertz wave generated by two-color laser plasma in air by analyzing the laser electric field, electron density, photocurrent and other related factors. These research results provide detailed parameter analysis and a theoretical basis for enhancing terahertz radiation energy with different laser parameters, which is of great significance for greatly enhancing terahertz radiation efficiency in the future.

In this paper, tungsten-nickel co-doped V2O5 films were prepared on FTO conductive glass by using sol-gel spin coating and annealing to study their photoelectric and phase transition properties at different temperatures and different bias voltage. The crystal structure, surface morphology and components of tungsten-nickel co-doping V2O5 films were tested by XRD, SEM and XPS to analyze the effects of different tungsten-nickel co-doping concentrations on the phase transition photoelectric properties of V2O5 films. The results show that when the doping concentrations of tungsten and nickel were respectively 3% and 1.5%, tungsten-nickel co-doped V2O5 films had a phase transition temperature of 218.5 ℃, a higher transmittance in the visible light range and the transmittance of 48.83% at 1310 nm wavelength. Comparing with the undoped V2O5 films, the optical transmittance and sheet resistance of the co-doped V2O5 films increased 10.29% and decreased 30.53%, respectively, and the thermal hysteresis loop width was also narrowed to 15 ℃. It is expected to have better applications in the field of new optoelectronic devices based on their excellent reversible phase transition photoelectric properties.

To meet the requirements of underwater target detection during close range operation of underwater robots, a real-time binocular image acquisition and processing system based on ZYNQ-7000 (ZYNQ) was designed and an underwater binocular camera prototype was developed. The system collects video data from OV5640 CMOS based on FPGA, converts it to an interface type supported by VDMA through IP core, and transmits the data to the DDR cache on the PS through AXI4 bus. The data are then sent to the PC software via Ethernet on the PS. After the analysis using the PC software, the binocular images can be real-time displayed and processed. The results show that the system has achieved real-time acquisition and storage of 1600 pixel ×600 pixel images at 25 frame/s, with an average reprojection error of 0.0542 pixel after binocular image calibration. Binocular image row alignment was achieved through stereo rectification. This provides a reliable platform for further testing and achieving underwater target measurement, positioning, and 3D reconstruction.

Neuromorphic computing uses spike neurons for parallel processing, which can overcome limitations of digital computers, thereby improving computing speed, performance, and energy efficiency to achieve more efficient, intelligent, and adaptive computing. The ultrafast Kerr effect has important significance and application in neuromorphic computing. An improved coupled mode theory (CMT) model was employed to analyzed the nonlinear dynamics behaviors in a micro-resonator based on the ultra-fast Kerr response of perovskite materials. Self-pulsation behavior was observed in the optical cavity. Based on this property, the excitation, leaky integrating dynamics and refractory time of optical neurons were simulated and implemented. Because of the ultra-fast Kerr response of the perovskite material, the refractory time of the optical neuron can be reduced to the order of picoseconds, which paves the way for ultra-fast spiking neural networks.

Organic light-emitting diode (OLED) has important applications in the next generation of lighting, displays and related fields. Blue fluorescent dyes are essential for the fabrication of OLED. In this study, by protonating a blue fluorescent dye 6-aminoisoquinoline (6-AIQ) with benzenesulfonic acid (BSA), the fluorescence quantum yield was successfully increased from 64.71% to 85.84%. The 6-AIQ-BSA was further inserted into a barrel-shaped hydroxypropyl-β-cyclodextrin (HP-β-CD) molecule to form a supramolecular structure, which could reduce the fluorescence quenching at high concentrations. Experiments showed that white light emission could be achieved by mixing the 6-AIQ-BSA@HP-β-CD with orange light dye DAST@ HP-β-CD in a ratio of 1.7 to 1, and its CIE color coordinates were (0.332 4, 0.328 4). The prepared film has the characteristics of good white light emission, lightweight, and flexibility, which makes it has broad application potential in various light-emitting devices.

To increase the light efficiency of laser light sources and further achieve long-distance illumination, a scheme based on combining light technology can be used to design a variable focus laser searchlight. Using the method of arranging multiple blue light LDs into an array and utilizing the light recovery technology of the glass reflector bowl, the optical path design of the laser searchlight was carried out. Simultaneously using a dichroic chip to control the divergence angle, variable focus control of the laser searchlight was achieved. Measure the luminous flux output by the laser module at a current of 1 A. After calculation, the total luminous flux emitted from the fluorescent ceramic chip was approximately 730 lm. In addition, changing the scattering characteristics of the uniform light sheet could achieve control of the focused laser spot. This study achieved the optical path design of a variable focus laser searchlight and the control of the focused laser spot, and used a dichroic chip to achieve mixed white light output of blue and yellow light. The overall optical efficiency of this optical system is high, and it has strong practical significance.

Thermal management in solid-state lasers is still a challenge in the development of high-energy laser systems. Introducing relative motion between the pump beam and the gain medium in the laser system is an efficient thermal management scheme. The temperature distribution of Nd∶YAG crystal was analyzed by means of finite element numerical simulation for static pumping, rotating gain medium pumping and pump-beam rotating pumping. Rotated at 800 r/min with standard heat-sinking cooling the disk temperature increased by only 16 ℃ reaching a maximum temperature of ～36 ℃, which is much lower than ～142 ℃ at static pumping. Experimentally, we designed and demonstrated a Nd∶YAG laser with the extracavity rotatory pumping, and obtained a 12.2 W output of 1064 nm with a slope efficiency of 37.2%, which is greater than the 35.1% at static pumping. The experimental results were coinciding with the theoretical simulation. The study shows that the solid state laser with extracavity rotatory pumping displays greatly enhanced thermal control.

The generation and manipulation of terahertz wave is crucial for the advancement of terahertz technology. The designable geometry and specific resonance response of metamaterials offer a novel approach for generating and manipulating terahertz waves. However, the low conversion efficiency of terahertz wave from metamaterials remains a challenging issue to be addressed. In this paper, a metamaterial was designed which consisted of metal resonator ring array and all-dielectric silicon split ring resonators. The terahertz wave radiation and manipulation of the metamaterial were studied by using self-consistent equations consisting of Maxwell's equation and the hydrodynamic model of the electron motion. It was discovered that by optimizing the opening direction of the split ring resonators, the amplitude of terahertz waves generated by the metamaterial was doubled. Furthermore, control over the amplitude of terahertz wave was achieved by altering both the polarization angle of incident light and the geometry of the metamaterial. This work opens up new possibilities for compact and tunable terahertz sources based on metamaterials.

A metasurface composed of stacked double-diabolo structure was designed. By adjusting lattice period of the metasurface, hybridization between different order lattice modes and eigenmodes of the metasurface led to three strong coupling regions and two Friedrich-Wintgen BIC (FW-BIC) at two lattice periods. The analysis results based on the coupled mode theory agreed well with the numerical simulation, which further proved the validity of our structure. The strong coupling and BIC effect could be used to enhance localized magnetic field in spacer layer. The maximum magnetic field intensity was 412 09 times of the incident THz wave, and this value was 4 times comparing with the purely electromagnetic resonance of metasurface. The results provide suggestions for the study of strong field THz generation and THz nonlinear optics.

Terahertz biomedical sensor is a hot spot in the current research. Its implementation method is mainly based on the use of metamaterials or two-dimensional materials to construct electromagnetic subwavelength structures. When terahertz waves interact with the structures, they cause phenomena similar to surface plasmon resonance and generate local electromagnetic field enhancement effects. The enhanced electric field improves the interaction between light and biological samples, resulting in a change in spectral response, enabling highly sensitive detection and analysis of biomolecules. Based on the research status in recent years, this paper expounds the types of biosensors and their applications in biomedicine and other fields, and discusses the future challenges and development prospects. It hopes to provide some valuable suggestions.