636 results about "Distance detection" patented technology

The invention belongs to the technical field of underwater small target object analysis and recognition methods, and particularly relates to a sound signal feature optimization method for underwater small target object analysis and recognition. Comprising the following steps: 1, acquiring and processing original data; 2, eliminating interference line spectrums, and intercepting and splicing by adopting a time window to obtain a time recombination sound signal; using range transformation to optimize signal amplitude characteristics; processing the sound signal by using an FIR digital high-pass filter; obtaining an optimized signal by using a homomorphic filter; 3, extracting structural features, energy features, frequency features and sound intensity features of the optimized digital signals; step 4, sound signal feature fusion: carrying out underwater target sound signal feature fusion processing based on a canonical correlation analysis method; the invention provides a method for extracting effective sound signal data of an underwater target under the background of optimizing a complex marine environment, enhancing signal effectiveness during long-distance detection, and constructing effective sound signal features capable of being used for classification and recognition of the underwater target at the same time.

The utility model discloses an airport construction beam pre-assembly axis control device which comprises a first construction beam to be assembled, a second construction beam to be assembled, a first positioning mechanism and a second positioning mechanism, and a top axis of the first construction beam is formed along a connecting line of midpoints of the front end and the rear end of the top of the first construction beam. A top axis of the second construction beam is formed along a connecting line of middle points of the front end and the rear end of the top of the second construction beam, and the first positioning mechanism and the second positioning mechanism are provided with a distance detection unit and a position detection unit which are matched with each other. Based on mathematical calculation and experimental verification, the utility model provides a technical scheme capable of solving the one-to-three positioning problem of the splicing form, and has the advantages of accurate positioning and high splicing efficiency.

The invention provides an on-line width measuring device and method for a plate blank. The device comprises a roller way; the distance detection modules are arranged on the two sides of the roller way in the width direction and used for detecting distance data between the plate blanks on the roller way and the distance detection modules; and the information processing module is used for calculating the width of the slab according to the distance data. A plate blank is conveyed through a roller way, distance detection modules arranged on the two sides of the roller way in the width direction collect plate blank distance data in a non-contact mode, the collected distance data are sent to an information processing module, the information processing module analyzes and calculates the collected plate blank distance data, and therefore the width of the plate blank is obtained. According to the technical scheme, manual intervention is not needed in the whole online slab width measurement process, and the risk that personnel are scalded by high-temperature slabs can be effectively avoided; moreover, through the combined algorithm processing of the distance detection module and the information processing module, the manual measurement error can be effectively eliminated, and the online detection precision of the slab width is effectively improved.

The utility model relates to a 2D galvanometer cutting observation platform which comprises a galvanometer distance measuring assembly, a lifting driving mechanism used for driving the galvanometer distance measuring assembly to do lifting motion, a positioning platform used for positioning a machined part and a camera assembly used for monitoring the cutting state. The galvanometer distance measuring assembly is installed on the fixing plate, the lifting driving mechanism is located on one side of the positioning platform, the galvanometer distance measuring assembly is located above the positioning platform, and the camera assembly is installed on the positioning platform. The galvanometer distance measuring assembly comprises an installation plate, a galvanometer assembly used for scanning the cutting position of a machined part and a distance measuring sensor used for measuring the height of the galvanometer assembly, and the distance measuring sensor and the galvanometer assembly are installed on the installation plate. According to the 2D galvanometer cutting observation platform, real-time monitoring of the machined part is achieved, distance detection of the galvanometer assembly is achieved, and the cutting accuracy of the machined part is guaranteed.

The utility model provides an airing height self-adaptive system and a clothes airing machine, and relates to the technical field of airing. The airing height self-adaption system is applied to the clothes airing machine and comprises a main control module arranged in a main machine of the clothes airing machine and a distance detection module arranged on an airing rod of the clothes airing machine. The distance detection module is in communication connection with the main control module, and is used for detecting existence of a detection object within a preset distance from the airing rod to a preset direction and sending a detection result to the main control module; and the main control module is used for controlling the airing rod to stop lifting through a power system of the clothes airing machine according to the received detection result. According to the system, the distance detection module connected with the main control module is arranged, the airing rod of the clothes airing machine can stay at the airing height matched with the height of a detected object on the basis of the structure and line structure, airing height self-adaption of a user of the clothes airing machine is achieved, and the intelligent degree of the clothes airing machine is remarkably improved.

The invention discloses a digital eyestrain detection method based on multi-task learning and an intelligent terminal. The method mainly solves the problems that the prior art depends on a single mode, only pays attention to a single task (for example, only the opening and closing state is detected), and comprehensive evaluation on the fatigue state of a user, especially the eye dryness condition is lacked. The invention provides a digital eye fatigue detection method based on multi-task learning and an intelligent terminal, and aims to realize high-precision fatigue and distance detection on low-cost hardware through fusion of multi-task learning and a monocular vision geometric model, solve the problems of limited precision of a single mode and redundancy of separate deployment calculation in the prior art, and improve the detection precision of the eye fatigue. The method is suitable for mobile terminals such as smart phones and tablet computers. After the scheme is deployed on the intelligent terminal, a user can be helped to keep a healthy screen use distance and a healthy screen display parameter, a healthy blinking habit is maintained, and dry eyes, astringent eyes and eyestrain are reduced.

Disclosed in the present invention are a body and pallet obstacle avoidance detection device of a four-way shuttle and an operating method therefor. The device comprises a four-way shuttle, pallets with goods, and orthogonally arranged Y-direction and X-direction tracks, wherein the four-way shuttle can run along the track directions of the Y-direction and X-direction tracks; shelf supports are provided on two sides of each Y-direction track, and the pallets are supported on the shelf supports; an X+ direction distance sensor and an X- direction distance sensor are respectively provided on the front and rear sides of the body of the four-way shuttle in the X direction; a Y+ direction distance sensor and a Y- direction distance sensor are respectively provided on the front and rear sides of the body of the four-way shuttle in the Y direction; a pallet Y+ distance measurement sensor and a pallet Y- distance measurement sensor are respectively provided on the front and rear sides of a jacking structure of the four-way shuttle in the Y direction; and the distance between the four-way shuttle and an obstacle is measured, in order to prevent the four-way shuttle from colliding with the obstacle or the pallets on the shelf supports.

According to various embodiments, an electronic apparatus may comprise: a housing including a front cover, a rear cover facing a direction opposite a direction of the front cover, and a side frame surrounding a space between the front cover and the rear cover; and a distance detection sensor module configured to detect a distance to an external object through the front cover from inside the space, wherein the distance detection sensor module may include: a substrate including a light emitting unit, a light receiving unit, a control circuit, and a ground layer; a module housing disposed on the substrate; a first shield can disposed in the module housing and electrically connected to the ground layer of the substrate; and a second shield can surrounding at least a portion of the light emitting unit disposed in the first shield can and exposed through the first shield can, and in contact with at least a portion of the first shield can.

The invention relates to an optical measuring arrangement (100) for detecting a distance between a first component and a second component by measuring the length of at least one measuring path (101), wherein the measuring path (101) is spanned between at least two facets (102, 103) forming a measuring head, which are directly or indirectly connected or connectable to the first component, and a measuring target (104) arranged in the measuring path (101), which is directly or indirectly connected or connectable to the second component and is configured to deflect a measuring beam (105) back and forth in the measuring path (101) between the facets, wherein the second facet (103) is formed as a reflecting facet (103). The center of curvature of one of the facets (102, 103) of the measuring head is located on the measuring target (104) or at most 20% of the distance between the facet (102, 103) and the measuring target (104). The invention further relates to a projection exposure system, a lithography system, an inspection system and a coordinate measuring machine.

The invention discloses an intelligent cooperative control system and method for vestibular function inspection. The invention discloses an intelligent cooperative control system and method for vestibular function examination, and belongs to the technical field of medical instruments. The system comprises a cold and hot air perfusion module, a dynamic visual target module, a head posture detection module, a sight distance detection module, an eye movement acquisition module, a voice interaction module, an adjustable examination chair and a central controller. The central controller realizes closed-loop control based on multi-source sensing data: during a cold and hot test, if the elevation angle of the head deviates from 30 degrees + / -2 degrees, stimulation is paused and voice prompt is performed; during visual target testing, visual target parameters are automatically compensated according to the actually measured sight distance of 1.5 m + / -0.1 m so as to maintain a constant visual angle, and the upright state (90 degrees + / -2 degrees) of the head is verified; abnormities such as eye closing more than or equal to 2 seconds or head movement more than or equal to 5 degrees per second are monitored in the whole process, graded voice intervention is implemented, and the abnormities are paused. Body position conversion is guided by voice, multi-source data are synchronously stored, and peripheral and central function correlation analysis is supported. According to the invention, the accuracy and compliance of inspection can be improved.

The invention discloses a global path planning method for a clustering obstacle scene, and relates to the technical field of computers. The method comprises the steps that obstacle distance detection, path segment verification and geometric constraint of diagonal movement are carried out on all nodes in a candidate expansion node set, and a target candidate node set is obtained; calculating the cumulative total cost of all nodes in the target candidate node set, determining the node with the minimum cumulative total cost as the current node, carrying out iteration in sequence until the current node is the target node, reconstructing a path from the initial node to the target node, and carrying out three times of B-spline smoothing processing on the reconstructed path to obtain a smooth path; traversing the smooth path, verifying the safety distance of each smooth node, and adding the smooth nodes to the optimized path when the safety distance of each smooth node meets the safety threshold constraint; and determining a corresponding optimized path when the smooth path traversal is completed as a final optimized path. According to the method, the safety of the global path generated in the clustering obstacle scene is improved.

The invention discloses a vehicle risk identification method and system, electronic equipment and a storage medium, and relates to the technical field of vehicle risk identification, and the method comprises the steps: building a conversion relation between a radar coordinate system used by a radar and an image coordinate system used by a camera device; based on the conversion relation, constructing a state space model between the radar data of the same road surface area acquired by the radar and the camera device and the road surface area image; using the state space model to perform data fusion on target radar data of the target road surface area acquired by the radar and the camera device and the target road surface area image to obtain fusion data; and carrying out risk identification on vehicles in the target road surface area according to the fusion data. According to the invention, through a cooperation mechanism of data fusion and a state space model, the advantages of radar high-precision distance detection and video precise vehicle identification are fully exerted, and efficient and accurate vehicle risk assessment is realized.

The invention provides a vision-based auxiliary-mark-free port machinery equipment movement distance detection method and system, and relates to the field of computers.The method comprises the steps that monocular cameras are installed on lifting appliances on the two sides of a gantry crane, the gantry crane is controlled to move along a preset track, and a calibration image sequence containing ground linear features is obtained; a radial distortion parameter of the camera is calculated, a nonlinear mapping model from a pixel coordinate system to a world coordinate system is established, a ground unshielded area is selected as a dynamic monitoring area, and a texture richness thermodynamic diagram is generated; after receiving a measurement instruction of a scheduling system, initializing an optical flow accumulator, loading a current feature point set, synchronously collecting monocular video streams, and distributing the monocular video streams to at least three preprocessing threads to execute differential image enhancement; optical flow calculation is executed on all preprocessing results in parallel, a multi-mode optical flow vector field is generated, and three-level optical flow screening is implemented. The precision and the sensitivity of small-range movement measurement of the gantry crane are improved through an optical flow method, and the influence of environmental factors on a measurement result is reduced.

Systems and methods for validating following distance detection models are discussed. A LIDAR unit and an image capture device are installed at a vehicle. LIDAR data from the LIDAR unit is used to identify a lead vehicle and for determination of a true following distance to the lead vehicle. An image-based following distance detection model is applied on image data captured by the image capture device. Following distance as determined by the image-based following distance model is compared to the true distance from the LIDAR data, to assess validity of the image-based following distance model.

The invention discloses a self-sensing anti-falling structure of an intelligent lock catch and a state monitoring method, the self-sensing anti-falling structure comprises a lock catch main body, and the center of the lock catch main body is provided with a first accommodating cavity for accommodating a data line plug; an anti-falling assembly, a controller and a power supply module are arranged in the lock catch body, the power supply module is electrically connected with the controller, the anti-falling assembly comprises a micro motor and a locking piece, at least two locking cavities are formed around the first containing cavity at equal angles, the micro motor is arranged in the lock catch body, and the locking piece is installed in the locking cavities through bearings. A rotating shaft of the micro motor drives the locking piece to rotate, and the locking piece is a barrel provided with an internal thread; the buckling piece is provided with a second containing cavity used for containing a data line socket, a plurality of locking rods are arranged on the side, close to the lock catch body, of the buckling piece, external threads are arranged on the locking rods, and the locking rods are in threaded connection with the locking piece. The sensing assembly comprises a distance detection sensor and a detection plate, and the distance detection sensor and the detection plate are fixed to one side of the data line plug and one side of the data line socket respectively.

The invention relates to an optical measuring arrangement (100) for position and / or distance detection of a component relative to a reference along at least one measuring axis, comprising an optical resonator (101) which has at least one coupling mirror (102) for coupling a measuring beam (103) and an end mirror (104) enclosing a resonator cavity (105). The resonator cavity (105) has a length adjustment range, wherein the measuring beam passes through the resonator cavity (105) more than once. The optical resonator (101) has at least one optical element (108) which is configured to control, at least within the length adjustment range (107) of the resonator cavity (105), the beam radius of the measuring beam (103) at the coupling mirror (102) and / or a Gouy phase of the measuring beam (103) propagating in the resonator cavity (105).The invention further relates to a projection exposure system, a lithography system, an inspection system and a coordinate measuring machine.

The application discloses a vehicle accident detection method, device and equipment and a storage medium. The method comprises the following steps: when the distance between a moving object around a vehicle and the vehicle is less than a preset threshold, acquiring the vehicle video of the time period when the distance between the moving object and the vehicle is within the preset threshold, the time point and the distance when the distance between the moving object and the vehicle is the shortest; detecting the relative position area of the moving object and the vehicle at the target time point; determining the vehicle accident risk level according to the vibration condition of the vehicle and the target distance; acquiring the image of the moving object, performing feature extraction on the image, determining the object type of the moving object, and identifying the object features of the moving object according to the object type; acquiring the current parking site of the vehicle, generating a corresponding vehicle accident report, and sending the vehicle accident report and the target video to a corresponding client. The application can improve the event backtracking efficiency of the vehicle owner when the accident occurs.

The embodiment of the invention discloses a non-blind area range resolution optimization laser wind measurement radar and a wind measurement method. The non-blind area range resolution optimization laser wind measurement radar comprises a seed laser; the beam splitter is used for splitting the single-frequency continuous light emitted by the seed laser into three paths: the short-distance detection emission unit is used for introducing a first path of laser and emitting the first path of laser to the atmosphere; the long-distance detection transmitting unit is used for introducing a second path of laser and transmitting the second path of laser to the main telescope; the main telescope is used for expanding the second path of laser and then emitting the second path of laser to the atmosphere, and is also used for receiving echo signals of the first path of laser and the second path of laser; the coherent beat frequency receiving light path processing unit is used for performing beat frequency amplification and differential amplification according to the received echo signals of the first path of laser and the second path of laser and the third path of laser and then converting the signals into electric signals; the processor is also used for carrying out range gate division and FFT processing on the electric signal according to a time sequence to obtain a frequency spectrum signal; and the inversion unit is used for inverting the wind speed data by using the frequency spectrum signal.

An intelligent charging port cover plate control circuit integrating UWB ultra wide band remote control is characterized in that a main controller is arranged, and a distance detection end group of the main controller is connected with an antenna through a UWB distance detection circuit; the key detection end of the main controller is connected with an external key switch through a key detection circuit; a charging port cover plate control end of the main controller is connected with a charging port cover plate switch through an LIN bus circuit; the UWB distance detection circuit is provided with a UWB distance detection module, a data receiving end of the UWB distance detection module is connected with a first distance detection end of the main controller after being connected with a resistor R74 in series, and a data transmitting end of the UWB distance detection module is connected with a second distance detection end of the main controller after being connected with a resistor R72 in series; a first signal transmitting and receiving end of the UWB distance detection module is connected with a first antenna interface after being connected with a resistor R114 in series, and a second signal transmitting and receiving end of the UWB distance detection module is connected with a second antenna interface after being connected with a resistor R119 in series. The intelligent charging port cover plate has the advantages that the mistaken touch prevention function of the intelligent charging port cover plate is achieved, and the reliability and the anti-interference capacity of the control circuit are improved.

This utility model relates to the field of dispensing equipment technology, and in particular to a dispensing height detection device. The dispensing height detection device includes a calibration base, a distance detection component, an imaging component, and a reading component. The calibration base is positioned below the dispensing head, and the distance detection component is fixed to the dispensing head. The distance detection component is used to detect the vertical distance between its detection end and the upper surface of the calibration base. The imaging component is configured to capture images of the dispensing head and the calibration base in a horizontal direction. The reading component is communicatively connected to the imaging component. The reading component can read the images captured by the imaging component and measure the vertical distance between the dispensing head's outlet and the upper surface of the calibration base, obtaining the actual value of the vertically extending distance between the dispensing head's outlet and the product. It also performs closed-loop analysis of the theoretical relationship between adhesive viscosity, dispensing valve orifice size, dispensing pressure, and dispensing height to ensure the dispensing quality of the product.

The utility model discloses visual inspection equipment for a touch screen module, and relates to the technical field of touch screen module detection. The device comprises a conveyor, a conveying belt is arranged in the conveyor, a detection assembly is arranged above the conveying belt, the detection assembly comprises a top seat, stand columns are fixedly connected to the four corners of the bottom of the top seat, and the bottoms of the stand columns are fixedly connected with the top of the conveyor. The detection assembly is arranged, specifically, the motor is started to drive the rotary disc to rotate, the push shaft pushes the fixing rod upwards or downwards, and the limiting rod drives the annular lamp holder to move together at the moment, so that the illumination height of the annular light supplementing lamp is adjusted, the distance is detected in cooperation with the distance sensor, and the illumination brightness of the annular light supplementing lamp is adjusted; meanwhile, the brightness and the light intensity of the light supplementing light source are automatically adjusted according to light information collected by the light sensor, and the detection effect of the touch screen can be improved through the multifunctional light supplementing effect.

The utility model discloses a distance detection mechanism, and relates to the technical field of detection, the distance detection mechanism comprises a mounting base, the surface of the mounting base is fixedly communicated with a protective housing, the protective housing is internally provided with a movable mechanism, the movable mechanism comprises a sliding rod and an adjusting push rod, the sliding rod is sleeved with a fixed sleeve, and the fixed sleeve is sleeved with a movable sleeve. A measuring mechanism is arranged at the bottom of the sliding rod, the measuring mechanism comprises a detection frame, a movable block and a first sensor, a second sensor is fixedly connected in the detection frame, the distance detection mechanism fixes a device on a cutter clamp through screw holes in the corners of the mounting base to detect a product, and through a fixing sleeve, the distance detection mechanism is fixed on the cutter clamp through the screw holes. The sliding rod is fixed, the ejector rod is adjusted to abut against the surface of a product, the sliding rod is controlled to move in the fixing sleeve, the machined product is detected, an alarm is given out when the movable block touches the first sensor or the second sensor, and unqualified products are screened.

The invention relates to a circuit board defect detection method and device, computer equipment and a storage medium. The method comprises the following steps: respectively carrying out positioning and defect identification on a target circuit board to obtain a structure type to which each positioning area belongs and a defect type to which each defect area belongs; for each structure type, constructing a hierarchical spatial index corresponding to the structure type according to the spatial coordinates of all the positioning areas under the structure type; according to association rules of defect types and structure types, determining at least one target structure type associated with each defect region; searching in a hierarchical spatial index corresponding to the at least one target structure type according to the position information of the defect area to obtain an adjacent positioning area meeting a preset distance condition with the defect area; and according to the distance between the defect area and the adjacent positioning area, determining quantitative information of the distance between the defect area and the adjacent normal element. By adopting the method, the defect distance detection efficiency in multiple positioning scenes can be improved.

The invention provides an online monitoring method and device for the corrosion change condition of a storage tank bottom plate. The method comprises the steps that a to-be-monitored point of the storage tank bottom plate is determined, and an ultrasonic guided wave sensor probe used for monitoring the corrosion change condition of the to-be-monitored point and the distance between the to-be-monitored point and the ultrasonic guided wave sensor probe are determined; detection curves of the ultrasonic guided wave sensor probe are obtained regularly, and for two adjacent detection curves, difference processing is carried out on the latter detection curve and the former detection curve to obtain a change curve; wherein the abscissa of the detection curve represents the distance between a point in the ultrasonic guided wave transmission path and the ultrasonic guided wave sensor probe, and the ordinate of the detection curve represents the signal amplitude; and determining the corrosion change rate of the to-be-monitored point according to the value of the change curve when the value of the abscissa is the distance and the value of the corresponding previous detection curve. According to the online monitoring method and device for the corrosion change condition of the storage tank bottom plate, online monitoring of the corrosion change condition of the storage tank bottom plate is achieved.

The embodiment of the invention provides a field vehicle braking distance detection method and related equipment, and the method comprises the steps: controlling a corresponding device to collect vehicle position data of a target field vehicle in a braking distance detection test after receiving a triggering signal transmitted by the corresponding device, and forming distance time sequence data; carrying out filtering processing on the distance time sequence data by adopting a median filtering algorithm, and carrying out distance change rate calculation based on the filtered distance time sequence data to obtain speed time sequence data; determining an initial system state variable at each moment based on the filtered distance time sequence data and speed time sequence data; updating the initial system state variable at each moment based on a Kalman filtering algorithm to obtain system state data; and performing calculation based on the system state data and the trigger signal, and outputting a braking distance test result of the target field vehicle. According to the embodiment of the invention, the efficiency and precision of field vehicle braking distance detection can be improved. The method can be widely applied to the technical field of field vehicle measurement.

The invention discloses a frequency modulated continuous wave cable local insulation defect detection method, which comprises the following steps: S1, realizing an FMCW method by using an FMCW cable fault positioning system, performing spectrogram function extraction and analysis on an incident signal and a reflected signal at a certain moment in the FMCW method to obtain a frequency difference between the incident signal and the reflected signal at the certain moment, and determining the frequency difference between the incident signal and the reflected signal at the certain moment; therefore, the position information from the cable defect to the head end of the cable is obtained, and effective fault diagnosis is realized. S2, time domain, frequency domain and power spectrum characteristic index extraction is carried out on the spectrogram function analysis signals, and index data of the analyzed signals are known more comprehensively; the method solves the problems that in the prior art, a reflection method is limited by frequency domain reflection signal amplitude attenuation, the detection distance is short, the requirement for long-distance cable detection cannot be met, FFT positioning spectrum covering information is single, interference of environmental factors is likely to happen, and cable state evaluation is not comprehensive enough.

The invention provides a smelting method and a control system of an embedded cluster oxygen lance structure for metallurgy, and relates to the technical field of electric arc furnace metallurgy oxygen lance structures and method regulation and control. The smelting method and the control system comprise a smelting control generation mode, a standby heat preservation mode, an auxiliary heating mode and an oxygen supply operation mode. According to the smelting method and the control system, different smelting methods and control modes of the embedded cluster oxygen lance are correspondingly formed in a logic judgment unit according to different structural parameters of the embedded cluster oxygen lance and typical smelting stage characteristics of an electric arc furnace; a temperature detection element and a distance detection element which are arranged at the tail part of the embedded spray pipe are used for measuring a molten pool temperature value and a molten pool height change value, and the working position of the embedded spray pipe and a gas supply mode of the embedded cluster oxygen lance are continuously controlled through a logic judgment unit based on digital signals of the molten pool temperature value and the molten pool height change value. The method is simple and easy to operate, low in cost, short in process, high in efficiency and beneficial to industrial large-scale production and popularization.

Embodiments of the present application provide an electronic device and a distance detection method. The electronic device comprises: a housing comprising a first housing and a second housing connected to each other, the second housing being capable of sliding relative to the first housing; a flexible display module, one end of the flexible display module being connected to the first housing, the other end of the flexible display module being connected to the second housing, the flexible display module being capable of switching between an unfolded state and a folded state when the second housing slides relative to the first housing; and a resistance detection module, the resistance detection module being installed on the first housing, resistance information of the resistance detection module being capable of changing when the second housing slides relative to the first housing, the resistance information being used to determine position information of the second housing relative to the first housing. The position information of the second housing relative to the first housing can be quickly determined according to the resistance information, and the speed of determining the specific state information of the flexible display module can be improved.

The utility model relates to the technical field of processing and detection of water meters, in particular to a detection jig for an arc-shaped protective cover of a measuring pipe of an electromagnetic water meter. The device comprises an arc-shaped protective cover detection jig, two guide holes are formed in the top of the arc-shaped protective cover detection jig, and hole distance detection positioning columns are arranged in the guide holes in a sliding mode. According to the utility model, the positioning holes on the protective cover are detected through the two hole distance detection positioning columns, the distance between the two positioning holes is determined, and the two sides of the protective cover are guided through the avoiding inclined planes, so that the edge of the protective cover is in contact with the limiting table; therefore, whether the opening part of the protective cover can complete the detection of the width of the upper positioning hole and the opening of the arc-shaped protective cover along the pass-stop detection table or not is judged, meanwhile, when the protective cover is detected, the protective cover only needs to be placed on the arc-shaped protective cover detection jig and pressed, the effect of detecting the protective cover can be completed, and the operation is convenient.

A time-of-flight (ToF) sensor and a method of operating it are provided. The ToF sensor includes at least one depth pixel with a multi-tap structure and a light source that illuminates an object. The operating mode of the ToF sensor is determined among a distance detection mode for sensing the distance to a target and multiple additional operating modes. Based on the determined operating mode, the multiple taps of the depth pixel and the light source are controlled such that the multiple taps generate multiple sampling data corresponding to the determined operating mode. Based on the multiple sampling data, a sensing result corresponding to the selected operating mode is determined. In addition to the function of the ToF sensor in measuring the distance to an object, multiple functions can be effectively performed by controlling the multiple taps of the depth pixel and the light source according to the operating mode.