148 results about "All optical" patented technology

The invention discloses an optical fiber three-dimensional shape sensor based on an optical frequency domain reflection technology and an application method of the optical fiber three-dimensional shape sensor, the optical fiber three-dimensional shape sensor comprises a base material and more than three optical fibers, and all the optical fibers are spirally wound and fixed on the surface of the base material at equal intervals and constant screw pitches to form distributed sensing units; according to the application method, measurement signals of all the optical fibers are obtained, and axial strain and strain are calculated; calculating the total curvature vector of the reconstruction curve of the measured object; calculating a bending direction angle and a curvature of the reconstruction curve of the measured object; performing differential calculation on the bending direction angle to obtain the torsion rate of the reconstructed curve of the measured object; and reconstructing the three-dimensional shape of the measured object according to the curvature and the torsion of the reconstructed curve of the measured object. The invention aims to realize synchronous measurement of bending, torsion and axial strain by using a distributed sensing unit formed by a multi-fiber structure which is spirally wound at the same interval and at a constant screw pitch.

A nonlinear all optical machine learning system (NAOMLS) with nonlinear optical resonator-based continuous wave and / or spiking neurons (NORs) and linear optical components or layers (LOL) learns to implement target tasks after machine learning based direct and / or indirect inverse design and / or optimization of the NORs and / or optimization of the LOL. The inversely designed and / or optimized NORs and the optimized LOL collectively define learnable mapping functions between input lights and output lights of the NAOMLS to meet target objectives for target tasks. In some embodiments, the NORs are indirectly and inversely designed to meet inversely designed objectives in order to be integrated with the NAOMLS so that the NAOMLS can function properly to meet target objectives for target tasks. In some embodiments, the NORs are integrated directly with the NAOMLS and inversely designed and / or optimized with the LOL to directly meet target objectives for target tasks.

The invention discloses a surface defect height quantitative detection method and device based on all-optical laser ultrasound. The method comprises the following steps: respectively exciting and detecting ultrasonic Rayleigh waves in a state that a pulse laser and a laser interferometer are arranged on the same side and different sides of a surface defect of a detected sample piece, extracting the transit time of an incident Rayleigh wave and the transit time of a transmission Rayleigh wave, and obtaining the height of the surface defect on the basis of the transit time of the incident Rayleigh wave and the transit time of the transmission Rayleigh wave. According to the invention, the detection of incident ultrasonic Rayleigh waves, reflected ultrasonic Rayleigh waves and transmitted ultrasonic Rayleigh waves is realized by moving the sample piece or the pulse laser and the laser interferometer through the linear motion platform, the height of the surface defect is calculated, the detected sample piece does not need to be clamped for the second time in the detection process, and high-efficiency in-situ quantitative detection is realized. In addition, nondestructive testing of the tested sample piece is achieved under a thermoelastic mechanism, the contact type defect of traditional ultrasonic testing is overcome, and the device is suitable for special environments such as high temperature, high pressure, intense radiation and strong corrosion.

A method for determining a bitrate allocation of a plurality of optical channels in an optical transmission link with discretized channel bitrates, the method comprising determining an initial discretized bitrate allocation and a corresponding initial power allocation for the plurality of optical channels for supporting the initial discretized bitrate allocation with the proviso that all optical channels meet a pre-defined optical signal-to-noise, OSNR, threshold for the respective initial discretized bitrate allocated to the respective optical channel; starting from the initial power allocation, varying, for an investigated optical channel of the plurality of optical channels, a channel power of the investigated optical channel to estimate a highest supported discretized bitrate for the investigated optical channel, wherein the highest supported discretized bitrate is the highest discretized bitrate for which the investigated optical channel meets a corresponding OSNR threshold; including the investigated optical channel in an upgrade candidate subset of the plurality of optical channels for potential bitrate upgrades based on the highest supported discretized bitrate exceeding the initial discretized bitrate for the investigated optical channel; and providing the upgrade candidate subset to an upgrade allocation algorithm.

The invention relates to a fully collinear polarization entangled light source system, which realizes collinear series layout of all optical elements along a single optical axis by splitting and combining pump light by adopting a light beam shifter, and does not need precise alignment of non-collinear angles in structure, thereby simplifying the assembly and debugging process of the system and improving the production efficiency. The sensitivity to mechanical vibration is reduced, and the long-term operation stability of the system is enhanced. Meanwhile, the collinear layout effectively compresses the length of an optical path, the overall physical size of the light source system is effectively reduced, and a feasible technical approach is provided for achieving compact, modularized and automatic batch production of the entangled light source.

A computing system may be provided. The computing system may include an optical memory cavity configured to store signal pulses representing a current combination for a combinatorial optimization computation. The computing system may further include an optical processing cavity. The optical processing cavity may be configured to receive the signal pulses from the optical memory cavity, perform an all-optical 1-bit delay computation on the signal pulses to generate a feedback pulse for at least one signal pulse, and provide the feedback pulse to be coupled back to the optical memory cavity.

The invention belongs to the field of synthesis of luminescent materials, and relates to a preparation method and application of a zero-dimensional manganese-based hybrid halide nanofiber membrane with reversible photoluminescence and radiation luminescence conversion. The synthetic route is as follows: preparing a precursor from 4-dimethylaminopyridine (DMAP) and hydrochloric acid, then synthesizing zero-dimensional organic-inorganic metal chloride with manganese chloride hydrate (MnCl2. 4H2O) and anhydrous manganese chloride (MnCl2), further mixing the zero-dimensional organic-inorganic metal chloride with polyvinylidene fluoride (PVDF), and performing electrostatic spinning to obtain a nanofiber film; compared with the prior art, the stimuli-responsive reversible PL switch flexible fiber membrane prepared by adopting an electrostatic spinning technology has excellent stability and PL switch performance, and can show efficient PL and RL switching under external stimuli. Meanwhile, the flexible nanofiber film produced by the method has the advantages of one-step synthesis, quick response, repeatability, good portability and low cost, so that the flexible nanofiber film becomes a new application of molecular-level dynamic photonic devices for data storage, information security, optical logic gates, flexible X-ray imaging and the like.

A cable state evaluation method and apparatus, and a terminal device and a storage medium. The method comprises: acquiring sensing data by means of an optical fiber sensor; dividing sampling points, and dividing sampling points on the same optical fiber segment into one group; integrating sensing data of each group of sampling points and inputting same into an optical fiber segment state evaluation model, so as to obtain a state evaluation result of a corresponding optical fiber segment; and on the basis of state evaluation results of all optical fiber segments, obtaining a cable state evaluation result of an entire optical fiber. Data collection, processing and evaluation can be automatically performed, thereby reducing manual intervention and improving the work efficiency and the accuracy of cable state evaluation results.

The utility model discloses a multi-light-path adjusting device which comprises a base, an adjusting seat, a first adjusting plate and a second adjusting plate, the base is of a C-shaped structure, and a groove for containing the adjusting seat is formed in the front end of the base; a plurality of light path generators are rotationally mounted on the adjusting seat, spherical adjusting pieces are arranged on the outer sides of the light path generators, and adjusting rods are arranged at the rear ends of the light path generators; an adjusting groove is formed in the adjusting base, a plurality of vertically-arranged first sliding grooves are formed in the first adjusting plate, a plurality of horizontally-arranged second sliding grooves are formed in the second adjusting plate, and the pitch angle and the horizontal dip angle of the light path generator can be adjusted through the first adjusting plate and the second adjusting plate. According to the utility model, the plurality of light path generators arranged in parallel are rotatably mounted on the adjusting seat, the light path directions of all the light path generators are synchronously adjusted, simultaneous calibration of multiple light paths is realized through one-time calibration translation, the difficulty of multi-light path adjustment is reduced, and the light path adjustment efficiency is improved.

The present invention discloses a high-temperature and high-pressure temperature field measurement method based on low-resolution ultraviolet absorption tomography. The method comprises: selecting the electronic transition of NO or OH in the ultraviolet band as the absorption spectrum measurement object according to the temperature of the temperature field to be measured, and selecting the vibration spectrum band of the measurement object according to the concentration and size conditions of the temperature field to be measured to determine the wavelength range to be measured; selecting a broadband light source and a low-resolution spectrometer as the light source and detector required for the absorption spectrum measurement, respectively; establishing an optical path network for absorption tomography, wherein each optical path uses the selected broadband light source and low-resolution spectrometer, and the absorption spectrum of the measurement object is measured on all optical paths. The temperature of each spatial position is calculated from the absorption spectrum signals collected by each optical path, and the temperature field is reconstructed. The present invention can realize accurate temperature measurement by absorption spectrum under high-temperature and high-pressure conditions, and realize accurate measurement of high-temperature and high-pressure temperature fields by combining with a tomography reconstruction algorithm.

This invention provides a power supply method, a power supply device, an electronic device, and a readable storage medium, relating to the field of power supply technology. The power supply method includes the following steps: at a first moment, determining the maximum power consumption of each optical module in the power supply equipment under all operating conditions; summing the maximum power consumption of all optical modules at the first moment to obtain the total power consumption of all optical modules in the power supply equipment under operating conditions at the first moment; and modifying the protection threshold of the power supply module of the power supply equipment based on the total power consumption. In this invention, by determining the total power consumption of all optical modules under operating conditions and modifying the protection threshold of the power supply module of the power supply equipment, in the event of a short circuit or micro-short circuit in an optical module, since the modified protection threshold matches the total power consumption of all optical modules in the power supply equipment under operating conditions, the power supply module can perform a timely response operation, thereby effectively and promptly protecting the power supply equipment and the optical modules.

The invention discloses a semiconductor resistivity nondestructive testing method and system based on modulation light reflection, relates to the technical field of semiconductor resistivity detection, and aims to accurately measure a modulation component delta R / R of light reflectivity through a light reflection modulation signal so as to calculate the semiconductor resistivity and further realize quantitative measurement of the semiconductor resistivity. The sensor has ultrahigh sensitivity, can detect tiny carrier concentration change, and is very sensitive to electrical properties of surface and near-surface areas; meanwhile, the spatial resolution is high, and the micron-scale light spot at the sample is suitable for micro-area measurement; a complete optical method does not cause any damage to the sample; various types of samples can be measured; the measuring speed is fast, and the system can be easily integrated in a production line for real-time monitoring.

The invention belongs to the technical field of laser interference precision measurement, and provides a full geometric error displacement calculation method based on non-approximate simplification of a light beam track. All optical machine geometric errors can be completely calculated, the real refraction condition can be completely calculated, no approximate error is introduced in the simplification process, and the displacement calculation process conforms to the real light beam track condition; according to the method provided by the invention, all reflection phenomena in the interferometer are simplified, parameter integration is carried out on a reflecting surface and a receiving surface of a reflected light beam, an originally complicated multi-beam calculation process is optimized, the number of parameter items required for completely describing geometric errors is reduced, and the calculation efficiency is improved. And meanwhile, the light beams which do not influence the calculation of the total optical path difference are deleted, so that the calculation efficiency is high.

The invention discloses a metal fatigue damage detection method based on double-grating laser ultrasonic multi-parameter measurement, and relates to the technical field of metal fatigue damage detection. According to the invention, a double-cycle transient grating is formed on the surface of a to-be-detected metal material by using a pulse laser beam modulated by a double-spacing slit mask, so that double-frequency high-strength resonant ultrasonic surface wave non-contact excitation is realized, and an ultrasonic surface wave signal is acquired through a laser interferometer based on the non-contact excitation. And performing fast Fourier transform on the measurement signal to obtain frequency spectrum information of the measurement signal, and detecting the metal fatigue damage according to multiple laser ultrasonic characteristic parameters extracted from the frequency spectrum information. Ultrasonic detection on the surface of the metal material to be detected is achieved through an all-optical means, the effects of no damage, complete non-contact and high accessibility are achieved, and the detection precision and resolution of local fatigue damage are improved.

This invention relates to a method and system for mapping the geographic route of optical cables based on their names. The method includes the following steps: acquiring power grid equipment data and optical cable name text; identifying optical cable information using semantic recognition technology; extracting the start and end stations from the optical cable information and matching them with power grid stations to generate association relationships; preprocessing transmission network data, distribution network data, and communication network data; performing communication station matching to obtain the location of communication stations; performing a primary power grid path matching; if a primary line exists, saving the optical cable association relationship according to the topology; if not, constructing an undirected graph of optical cable paths, using a breadth-first search algorithm to obtain the set of all optical cable paths, using Dijstra's algorithm to obtain the optimal optical cable path, and mapping the geographic route of the optical cable on a Geographic Information System (GIS). This invention can effectively improve the efficiency and quality of mapping the geographic route of power grid optical cables.

The invention discloses an automatic configuration method for optical path subsystem design, and relates to the technical field of optical communication transmission, and the method comprises the steps: inputting configuration parameters required by an optical path subsystem to be designed, and summarizing and outputting a first configuration table which comprises the optical cable lengths, average attenuation, optical cable types, protection modes and transmission rates of all optical path sections; data resource analysis is carried out on the table based on the AI learning technology, and an optical path configuration scheme of optical amplification board card combination and dispersion compensation under different transmission rates is given; and performing multi-layer verification on the optical path configuration scheme, and outputting an optimal configuration scheme. According to the method, on the basis of the AI calculation and automation technology, corresponding configuration is provided for different optical path conditions under the condition that a machine continuously learns configuration, and the four technical values of efficiency improvement, accuracy controllability, cost optimization and standard unification are achieved.

The invention discloses an infrared explosion-proof light source based on laser aiming, relates to the technical field of optical aiming equipment, and aims to solve the technical problems that in the prior art, the light source, aiming, structure and environmental adaptability are poor, heat dissipation is not achieved in part of design, and collimation stability in an extreme environment is difficult to guarantee. And one end of the telescope mechanism is connected with the explosion-proof cavity mechanism. According to the invention, a full-rigid integration and sealing design is adopted, so that all optical elements are rigidly integrated in a firm lens cone to form a stable optical reference, the design enhances the vibration resistance and impact resistance of equipment, the equipment can stably work in a severe industrial environment, and the equipment has high reliability in an industrial field with frequent vibration and impact. A user does not need to worry about equipment misalignment or damage, maintenance cost and downtime are reduced, meanwhile, pollution and corrosion of internal optical elements are effectively prevented through the sealing design, and the service life of the equipment is prolonged.

The invention provides a super-power illumination system and illumination method based on multi-light-source optical fiber integration, and the system comprises at least two independent light source modules, optical coupling units with the number corresponding to that of the light source modules, a plurality of optical transmission channels, and an integrated optical output terminal comprising a light beam synthesis and scattering device. The optical coupling units are used for focusing and coupling light rays emitted by the corresponding light source modules, and the multiple light transmission channels are used for conducting the light rays focused by the light source modules; and the integrated optical output terminal is used for receiving the light beams from all the optical fibers, synthesizing the light beams and scattering the light beams into uniform and large-spot integrated output light. Light is transmitted through the optical fiber, no current passes through a transmission path, potential safety hazards such as electric leakage and electric sparks are completely eradicated, efficient focusing and coupling of visible light are achieved through the optical coupling module, loss of the light in the initial transmission stage is greatly reduced, and the overall energy efficiency of a lighting system is improved.

The present application discloses an all-optical ultrasonic imaging system based on phase modulation, which belongs to the field of imaging technology. The system includes: a laser assembly, an ultrasonic detector, an interference device, and an imaging assembly; the laser assembly is used to provide continuous laser light to the interference device; the interference device includes a reference fiber arm, a sample fiber arm, and an optical path adjustment device, and is located between the ultrasonic detector and the imaging assembly; wherein the interference device is used to separate the laser light into reference light and detection light, and transmit the detection light to the ultrasonic detector for phase modulation; the optical path adjustment device is used to adjust the optical path difference between the two arms, and form interference light between the reference light and the phase-modulated detection light, which is then input into the imaging assembly; the ultrasonic detector is used to generate ultrasonic waves, project the ultrasonic waves to the area to be measured, and phase-modulate the detection light in response to the ultrasonic echo of the area to be measured; and the imaging assembly is used to generate a corresponding image based on the interference light.

The invention discloses a fused quartz substrate integrated laser radar transmit-receive optical module and an adjusting method, and belongs to the technical field of optical instruments. According to the module, all optical elements for transmitting and receiving optical paths are integrated on the same fused quartz substrate, and each element is provided with a micro sensor and a micro adjusting device. The system comprises a first control loop, a second control loop, a first central signal gating and routing unit and comparative judgment and arbitration logic. By means of six predefined paragraph diagnosis modes, the system can accurately position misalignment paragraphs in an optical path and only drives the micro adjusting devices corresponding to the misalignment paragraphs to conduct cooperative closed-loop compensation, and self-adaptive alignment from local fine adjustment to global search is achieved. The method has the beneficial effects of full-life-cycle self-maintenance, accurate and efficient adjustment, global optimization of a transceiving link, remarkable reduction of full-life-cycle cost and the like, and is particularly suitable for the fields of vehicle-mounted laser radars with high reliability requirements and the like.

The invention discloses a cerebrospinal fluid sampling and detecting device, and belongs to the technical field of neurology. According to the cerebrospinal fluid sampling and detecting device, a detecting and distributing head, a puncture needle, a control cabinet and a detecting box are arranged on a device base, a sealing sleeve is arranged in the detecting and distributing head, a preliminary checking disc is installed in the sealing sleeve, and a three-way valve is installed between the detecting box and the detecting and distributing head. The cerebrospinal fluid sampling and detecting device solves the problems that an existing cerebrospinal fluid sampling and detecting device cannot carry out split charging to achieve automatic adjusting operation, and the detection effect is affected, according to detection data, the electric actuator is adjusted through the plc module, the three-way valve and the adjusting valve are controlled, and therefore according to the detection result, the cerebrospinal fluid can be firstly split charged, and then split charging is carried out. All optical and electrochemical signals are captured by an optical fiber sensing array plate and a detection box which are arranged in the detection distribution head, and are transmitted to a control cabinet through Bluetooth, so that different detection processing work is carried out in time, treatment schemes are effectively switched, and the detection effect is improved.

The invention discloses an optical fiber beam combination method, and relates to the technical field of optical fiber beam combination, and the method comprises the following steps: S1, selecting a plurality of optical fiber units to be combined, the optical fiber units being single optical fibers and / or combined optical fibers; s2, asynchronous coupling is carried out on a plurality of optical fiber units to be combined, in asynchronous coupling, two optical fiber units are combined, an output optical fiber after beam combination is used as an optical fiber unit and then combined with another optical fiber unit, and the rest can be done in the same manner until beam combination of all optical fiber units is completed; s3, packaging protection is carried out on the beam combining area; according to the invention, through an asynchronous coupling mode, the plurality of optical fiber units which are concentrated together for coupling are spatially dispersed, so that the problem of heat concentration is avoided, the upper limit of optical fiber coupling energy can be broken through, and the optical fiber units can be infinitely superposed within the limit of optical energy which can be borne by the optical fiber.

The utility model discloses a laser displacement sensor shell using a diffusion lens and a linear polarizer in a combined mode, and particularly relates to the field of photoelectric measurement. Comprising a lower shell, the upper cover of the lower shell is provided with a cover plate, the lower shell comprises a bottom plate, the surface of the bottom plate is vertically connected with a U-shaped first baffle, a second baffle is connected between the opening ends of the first baffle, and a first groove and a second groove are formed in the second baffle at intervals; the first groove is located at the receiving end of the laser displacement sensor. A first connecting plate is connected between the opening ends of the first grooves, and a first through hole matched with the first linear polarizer is formed in the first connecting plate; the second groove is located at the transmitting end of the laser displacement sensor; a second connecting plate is connected between the two inner side walls of the second groove, and two second through holes parallel to each other are formed in the second connecting plate. Through the shell, the laser displacement sensor body and each optical element can be integrally packaged.

The embodiment of the invention discloses a network cutover checking method and electronic equipment. The method comprises the following steps: acquiring a target cutover work order; according to the first identification information, determining one or more optical network devices to be subjected to cutover adjustment; determining user information corresponding to the one or more optical network devices according to the one or more optical network devices; determining second identification information of all optical network units (ONU) under the original cutover network element and / or the target cutover network element according to the original cutover network element and / or the target cutover network element; and checking the target cutover work order according to comparison between first terminal equipment identification information in the user information and second terminal equipment identification information in the second identification information. Through the scheme, the cutover range can be accurately identified, the data consistency can be verified, cutover errors are reduced, and the user recovery quality is improved.

This invention provides a fully optical end-tidal carbon dioxide monitoring device for high-flow oxygen supply, comprising an air inlet (1), an air outlet (2), an infrared light source (3), a near-infrared light source (4), a cavity (5), M photodiodes (6), and a control unit (7); the infrared LED light source has a center wavelength of 4.3 μm, the near-infrared LD light source has a center wavelength of 1310 nm, the M photodiodes (6) are arranged in a ring within the detection tube (8), and the control unit (7) carries a detection method to achieve high-speed and high-precision measurement. This invention can be used for high-speed and accurate measurement of exhaled CO2 concentration in clinical high-flow ventilators.

The utility model discloses a device for measuring the transmittance of a reflective film. According to the utility model, by adding the reflecting surface, the transmittance of the thin film can be directly calculated through a formula only by respectively measuring the light intensity reflectivity R of the thin film and the light intensity reflectivity R'of the thin film-reflecting surface, and a precise optical model and complex fitting do not need to be established; reflected light of the thin film and light reflected by the reflecting surface do not interfere with each other, amplitude superposition is not involved, only light intensity superposition is achieved, the transmittance can be obtained only by obtaining the light intensity, and the transmittance of the thin film is measured by measuring the reflectivity twice. In the process of measuring the transmittance in a reflection mode, the thickness and the optical property of the film do not need to be known in advance, and the device is very suitable for measuring and monitoring the growth process of the film in situ in real time; all optical elements are arranged on one side of the thin film, the available angle range of incident light is far larger than the angle range of an ellipsometer, and the ellipsometer can be easily integrated with other film manufacturing equipment.

The application provides a pre-tailings discarding mode distinguishing method based on useful mineral dissemination characteristics, and relates to the field of mineral processing. The pre-tailings discarding mode distinguishing method based on useful mineral dissemination characteristics comprises the following steps: preparing a plurality of optical sections from an ore sample; analyzing the optical sections by using an optical microscope and an image analysis technology, and classifying the dissemination characteristics of useful minerals in the optical sections; calculating the average occupancy of local enrichment type in all optical sections, the average occupancy of vein type in all optical sections, and calculating a pre-enrichment proportion Pvalid; comparing the pre-enrichment proportion with a preset threshold value, and if Pvalid is greater than or equal to the preset threshold value, it is determined that the ore sample is suitable for pre-enrichment by using a pre-tailings discarding process. The prediction conclusion of the method of the application is highly consistent with actual industrial test and production data, has the advantage of high accuracy, solves the problem that the pre-discarding effect can only be detected by test, and is beneficial to improving work efficiency and reducing cost.

This application provides a multi-parameter fiber optic monitoring device for bolt loosening on transmission towers, belonging to the field of bolt loosening monitoring. It aims to solve the problems of existing bolt loosening monitoring schemes, such as susceptibility to strong electromagnetic interference, low integration, inability to cover the entire loosening cycle, and high false alarm rate. This device includes an integrated fiber optic grating-Fabry-Perot cavity sensor head and signal demodulation system, employing a coaxial push rod-mass block integrated linkage structure to achieve synchronous acquisition and mechanical decoupling of bolt axial displacement and triaxial vibration. Through a dual-band optical path architecture of 1310nm O-band and 1550nm C-band, combined with a dual-window wavelength division multiplexer, complete optical decoupling of the two parameters is achieved. It is equipped with dual-link independent wavelength calibration, hardware full-link synchronous triggering, and a dual-parameter mutual verification mechanism. This application is inherently resistant to strong electromagnetic interference and can achieve highly reliable monitoring of bolt loosening throughout its entire lifecycle.

An optical device, such as a camera or spot light, having first and second removably engagable components. Disengagement of the components exposes a battery compartment in the second component. The first component can include all optical components of the optical device, such as a camera or light. A magnetic mount can provide a secure and adjustable mounting for the optical device housing on a support.

The utility model relates to the technical field of traffic safety and optics, and discloses a changeable road pointing board which comprises a main direction pointing arrow, an auxiliary direction pointing arrow, an environment illumination sensor system, a main direction arrow driving control system, an auxiliary direction arrow driving control system, a power line system and a road pointing board mounting frame. The environment illumination sensor system informs the main direction arrow driving control system to control the LED lamps on the main direction directing arrows to be turned on, and the LED lamps are turned on, and the white substrates of the main direction directing arrows reflect LED white light for directing. Under the condition that the auxiliary direction directing arrow is needed to direct the way, the LED white light on the auxiliary direction directing arrow is turned on and presses the blue substrate of the auxiliary direction directing arrow to present the bright white arrow for directing the way, the scheme can realize that the directing direction can be changed, the directing direction can be adjusted according to the road condition, and the directing arrow can be lightened when the environment illumination is low, so that the directing direction can be changed. And a driver can conveniently and remotely recognize the road direction.