34 results about "Test distance" patented technology

The invention aims to provide a dual-camera focusing and focus checking system based on a UVC mode, and the system achieves the automatic switching of an equivalent test distance between a main camera and an auxiliary camera through a cooperative control mechanism of an electric sliding rail type Chart platform and a teleconverter module. MTF threshold tables corresponding to different test stages are called according to different test stages of focusing, focus checking, final inspection and the like of the camera, so that the MTF values of the different test stages are compared; through adaptive focusing and focus checking of the double cameras based on the UVC mode, the cameras delivered to a user can work in an optimal use state.

The utility model provides a testing device and a testing system. The testing device comprises a track structure; the rotating structure comprises a base slidably connected with the track structure and a rotating assembly capable of rotating relative to the base, a supporting rod is fixedly connected to the center of the rotating assembly, and a rotating shaft assembly is rotatably connected to the top end of the supporting rod; the human body model sleeves the periphery of the supporting rod and can rotate relative to the base around a first rotating center along with the rotating assembly; the head model is fixedly connected with the rotating shaft assembly and can rotate relative to the supporting rod around the second rotating center along with the rotating shaft assembly; an image acquisition and recognition part is arranged on the rotating shaft assembly to recognize an image in front of the human body model and judge a test result. The testing device and the testing system can effectively and accurately complete testing distance changing, head turning and nodding actions so as to meet the testing requirements, are higher in accuracy, can automatically judge the testing result, greatly improve the testing efficiency and liberate manpower.

The present invention addresses the problem of providing an optometric device that, when an optical member is set and a pseudo refractive power test is performed, prevents a decrease in test precision caused by changing the apparent size of a visual target presented at a far test distance position. An optometric device (1) comprises a reflector head (100) that has an optometric window (114) for observing a visual target M, a visual target presentation device (200) that presents a visual target M at a far test distance position, and a control unit (330) that controls the parts of the device. The reflector head (100) sets, at the position of the optometric window (114) which is disposed in front of an eye E being examined, a spherical lens that is used to simulatively present, as a near-distance visual target at a near test distance position, a visual target M which is presented at a far test distance position. The control unit (330) has a visual target rendering magnification alteration unit (336) that, when the spherical lens is set and a pseudo near-distance test is performed, changes the rendering magnification β of the visual target M displayed on the visual target presentation device (200) to a magnification that suppresses a change in the apparent size of the visual target M presented at the far test distance position.

A system includes a controller having one or more processors. The system also includes a memory, and instructions stored on the memory, and executable by the one or more processors to output a control signal that causes an actuation of a valve to move a test distance via an electromechanical actuator; receive electrical property data corresponding to the actuation over the test distance by the electromechanical actuator; evaluate a condition of the valve based on the electrical property data; and generate an output based on the condition of the valve.

The utility model discloses a tool for detecting the environmental applicability of a single-point dof range finder, and the tool comprises an adjusting table which is disposed in a temperature control cabinet; the number of the reflection panels is two, the reflection panels are symmetrically arranged on the adjusting table, and an adjusting lead screw used for adjusting the distance between the two reflection panels is arranged in the adjusting table; and the fixed support is arranged between the two groups of reflection panels, the fixed support comprises an adjusting platform and a rotating support, the rotating support is rotatably arranged on the adjusting platform, and the rotating support is used for fixing a range finder to be measured and adjusting the angle of the range finder to be measured. According to the utility model, the adjusting table is arranged in the temperature control cabinet, the range finder to be measured is arranged between the two groups of reflection panels through the fixing support, the distance is prolonged through the reflection between the mirror surfaces, and then the detection panel is arranged at the corresponding position for adjustment until the required test distance is reached.

The application discloses a method and device for adjusting the testing distance of a camera module card, wherein the method comprises: obtaining the theoretical working distance of a target camera module, and determining the distance adjustment interval according to the theoretical working distance; controlling the testing card to move along the Z-axis in the distance adjustment interval according to a preset stepping strategy, and triggering the target camera module to collect corresponding card images at each stepping position to generate an image sequence; extracting the edge amplitude features of each card image, and calculating the gray value deviation based on the edge amplitude features as the definition evaluation value of the corresponding card image; determining the target stepping position according to the definition evaluation value, and driving the testing card to move to the target stepping position to complete the adaptive adjustment of the testing distance. Thus, the objectivity, consistency and accuracy of the determination of the testing distance of the card are improved.

The invention relates to a method for measuring a test distance (DT) separating a camera (CAM) from a user (1), comprising steps of: - prompting the user to get in a first position, - displaying a reference object, - acquiring a first image comprising the reference object and at least one body of the user, - detecting and measuring a calibration length from the reference and obtaining a calibration distance separating the camera and the reference object, - detecting and measuring at least one first reference length relative to the at least one body part, - prompting the user to get in a second position, - acquiring a second image comprising the at least one body part, - detecting and measuring at least one second reference length (RL') in the second image, and - obtaining the test distance (DT).

The invention relates to the technical field of rubber friction characteristics, and discloses a method for testing rubber friction characteristics, which comprises the following steps: preparing a rubber wheel according to sample requirements of a testing machine, additionally arranging a slip rate control device, controlling the rotating speed of the rubber wheel, and enabling the rubber wheel to freely roll and slip relative to a friction disc of the testing machine during testing. Test parameters including a slip angle, a load, a slip rate, a test distance and a test temperature are set, the equipment is operated to carry out friction test on each test working condition, and a sensor of the testing machine is utilized to automatically record related data. According to the invention, different slip speeds are realized by controlling the slip rate, the rubber wheel rolls while slipping, the contact area is not fixed at the same position, and the temperature of the contact area does not rise sharply, so that the temperature does not affect the test result.

The invention relates to a method for adjusting a trigger threshold value of a capacitive pressure sensor, wherein the capacitive pressure sensor comprises an operation panel for pressing. The method comprises the following steps: applying a plurality of test presses on the operation panel with the same force; determining test distances from the position of the test press to a reference position, wherein the test distances have different lengths; determining a test capacitance value caused by the test pressing; fitting a function relationship between the test capacitance value and the test distance according to the trend of the test capacitance value along with the test distance; and determining the trigger threshold according to the distance from each position on the operation panel to the reference position by using the function relationship. The invention further relates to a capacitive pressure sensor and to a method for determining whether a pressing operation on a capacitive pressure sensor is valid.

The present application relates to the field of optical fiber sensing, in particular to a kind of multi-fusion sensing long-distance testing device and method.It includes at least one sensing optical fiber, at least two drivers, at least two synchronizers and a manager;Driver sends test signal to sensing optical fiber, and receives sensing signal returned in sensing optical fiber, adjacent two drivers are connected by a sensing optical fiber, and the length of sensing optical fiber is less than or equal to the sum of the farthest test distance of two end drivers;Synchronizer corresponds to driver one by one, sends synchronization signal to sensing optical fiber, and receives synchronization signal sent by opposite end synchronizer, to control the driver at the two ends of each sensing optical fiber to carry out test synchronously or asynchronously;Manager is connected with the driver and synchronizer at one end of sensing optical fiber through signal interface, manages the test process of each driver, and analyzes the sensing signal received by driver.It can extend the length of sensing optical fiber, and use simple process to complete multiple continuous tests.

This disclosure provides a test structure and a test method for short-circuit window, contact resistance, and sheet resistance. The test structure includes: a substrate with an isolation structure therein; a gate structure located above the isolation structure; an active region located above the substrate; multiple contact plugs located above the active region and electrically connected to the active region, the contact plugs being arranged in an array; the gate structure being arranged in a serpentine pattern, the gate structure being adjacent to and spaced apart from the sidewalls of each contact plug; a first pad electrically connected to the gate structure; a second pad and a third pad electrically connected to different contact plugs, respectively; a fourth pad electrically connected to the gate structure, and the fourth pad and the first pad being located at opposite ends of the gate structure; the width of the isolation structure is greater than or equal to the width of the gate structure, and the shortest distance from the contact plug to the gate structure is the test distance. Using the above technical solution, the test requirements for short-circuit window, contact resistance, and sheet resistance can be met, and the test accuracy can be improved.

This application discloses a transmission line impedance calibration method, system, and storage medium. The method includes: acquiring the impedance change slope of a sample transmission line of the same type as the transmission line under test, and calibrating the original time-domain reflection impedance curve of the transmission line under test based on this impedance change slope to obtain a target time-domain reflection impedance curve. By acquiring the impedance change slope of a sample transmission line of the same type and performing compensating calibration on the transmission line under test, this application effectively solves the problem of a false increase in impedance value with increasing test distance in long-distance transmission line TDR testing. The calibrated impedance data is closer to the true characteristics of the transmission line harness, providing a reliable data basis for harness quality assessment.

The utility model relates to a laser wind measurement radar wind speed detection range testing arrangement, belong to laser wind measurement radar technical field. The utility model discloses electric turntable simulation wind speed, realizes wide range's wind speed simulation through the adjustment motor speed, through 9 reflector and carries out light path to turn over, realizes 50m test distance simulation, the base subassembly and the cover shell subassembly of device integrate reflector subassembly and electric turntable subassembly in an organic whole, form laser wind measurement radar wind speed detection range testing arrangement, convenient to use, simple operation.

The present disclosure provides a Bluetooth test method, device, electronic equipment and storage medium, the method comprises: obtaining a plurality of test distances, determining the transmission power corresponding to each test distance; wherein the plurality of test distances are different from each other; based on the transmission power corresponding to each test distance, sending a request signal, and obtaining the signal strength of the request signal received by the to-be-tested terminal and the test data sent in response to the request signal; based on the test data, determining the transmission rate; according to the transmission rate and the signal strength, the Bluetooth test result corresponding to the test distance is obtained; based on the Bluetooth test result corresponding to all test distances, the Bluetooth test result of the to-be-tested terminal is determined. The scheme of the present disclosure can accurately simulate different communication distance scenarios without changing the actual physical distance between the test terminal and the to-be-tested terminal, and realize automatic detection of Bluetooth function.

The utility model provides a test pencil, and belongs to the technical field of test pencils. Comprising a light-transmitting plastic shell, a copper rivet is arranged at one end of the light-transmitting plastic shell, and a spring, a neon tube, a resistor and a clamping seat are arranged on one side of the copper rivet. According to the utility model, through the arrangement of the telescopic spring, when a position needing electricity measurement is too deep, pressure is released through the telescopic spring to enable the detection head to move in parallel, so that the testable distance can be increased, otherwise, the detection head is extruded to enable the telescopic spring to be extruded so as to shorten the actually-measured distance; when a charged test is carried out on a deeper electricity-measuring structure, the position of the deeper electricity-measuring structure causes that the test pencil cannot be in contact with the deeper electricity-measuring structure, so that the detection head can be stretched out and drawn back according to the use condition, and the effect of carrying out the charged test on the deeper electricity-measuring structure is achieved; and external power supply equipment is butted with the power supply socket, so that the performance of the test pen can be tested before the test pen is used.

To provide a visual testing tool that enables accurate testing in visual examinations for infants and children, such as the visual examination during the 3-year-old health checkup. [Solution] A visual examination device 1 for use in visual examinations, comprising at least two surfaces, wherein one surface 10 has a target 11 for visual acuity testing, and the other surface 20 has a target 21 for binocular vision testing. Preferably, the target for binocular vision testing is made by attaching alternating strip-shaped images for the right eye and left eye to a lenticular lens, and more preferably, the target for visual acuity testing and the target for binocular vision testing are made such that the testing distance for visual acuity testing using the target for visual acuity testing is the same as the testing distance for binocular vision testing using the target for binocular vision testing, in which case the testing distance is preferably 30 cm to 40 cm.

The invention relates to test equipment for testing the display degree of a test sample with an adjustable visual field distance. The test equipment comprises a darkroom experiment cavity defined by a box body and a cover body, a light source, a sample mounting module and an illuminometer are arranged in the box body; an observation assembly for observing the display degree of the to-be-detected sample is rotationally arranged on the box body; a short-distance test mode and a long-distance test mode are arranged in the box body; an adjusting module for adjusting the visual field distance between the sample mounting module and the observation assembly is also arranged in the box body; the test equipment is ingenious in design, provides a short-distance test mode and a long-distance test mode, can meet the requirements of different test standards and test distances, and improves the flexibility and the application range of the test equipment. The visual field distance between the sample installation module and the observation assembly is adjusted through the adjusting module, and the observation conditions of people for the emergency lighting lamp at different distances in actual use can be simulated more truly.

The utility model discloses a test positioning system for a needle flame test, which comprises an experiment box body, and an experiment cavity is arranged on one side of the experiment box body. A workbench is arranged in the experiment cavity and comprises a first telescopic frame, a second telescopic frame, a needle flame test piece, a first positioning mechanism, a second positioning mechanism, a data collection module and an operation module. The infrared positioning device is installed on the side edge of the original needle flame burner device, and after the burner moves to the corresponding test position and meets the test distance, infrared induction automatically starts timing, so that the human influence factors in the test process are low, the test result is more accurate, the test process is recorded through the camera, and the test efficiency is improved. The combustion process of the experimental sample in the needle flame test can be slowly analyzed through playback, so that experimenters are liberated, and the experimenters do not need to stand outside the experimental box body frequently to record data.

This application relates to the field of vehicle control technology, and in particular to a digital key location identification method, device, and storage medium. It includes: acquiring the anchor point distance between any two adjacent anchor points among four anchor points on the vehicle, the test distance between each anchor point and the digital key, and the boundary distance between each anchor point and the inner and outer boundaries of the vehicle body; wherein, the anchor points are used to determine the test distance based on the ranging signal between them and the digital key; the four anchor points on the vehicle form an anchor point plane; the boundary distance is the distance between the anchor point and the nearest inner and outer boundaries of the vehicle body; based on the test distance and the anchor point distance, the projected distance of the test distance on the anchor point plane is determined; the final position of the digital key is determined based on the projected distance, the anchor point distance, and the boundary distance; the final position is either inside or outside the vehicle compartment. The embodiments of this application are used to solve the problem of inaccurate digital key location identification.

The invention provides a testing device for an optical range finder, and the device comprises a testing machine which is in communication connection with the optical range finder and is used for controlling the optical range finder to output an emission control instruction; the light emitting device is in communication connection with the optical range finder and is used for outputting emitted light in response to the emission control instruction; the receiving optical device is communicated with the light emitting device through a light transmission medium; one end of the optical transmission medium receives the emitted light output from the light emitting device, the other end outputs the emitted light to the receiving optical device, an optical transmission channel is formed between the two ends of the optical transmission medium, and the length of the optical transmission channel is set according to the expected test distance of the optical range finder; the receiving optical device projects the emitted light to the optical range finder, so that the optical range finder calculates the transmission distance of the emitted light to obtain a test distance and outputs the test distance to the test machine, and the test distance is used for the test machine to perform result operation to obtain a test result. The invention further provides a testing method of the optical range finder.

1. The name of the design product: electronic device's setting visual acuity test distance graphical user interface. 2. The use of the design product: for electronic device. 3. The design points of the design product: in the graphical user interface. 4. The picture or photo that best indicates the design points: design 1 front view. 5. Design 1 is designated as the basic design. 6. The use of the graphical user interface: for test distance setting when visual acuity test. 7. The change state description of the graphical user interface: click "next" in design 1 front view to display design 1 change state figure 1, click "finish" after selecting test distance in design 1 change state figure 1 to display design 1 change state figure 2, the interaction mode of design 2 and design 3 is the same as that of design 1. 8. A, B, C parts in the view are content picture areas, and X in the view represents replaceable text.

A method suitable for an external field RCS test comprises the steps that firstly, site layout design is carried out, the target erection height, the target size, the test frequency, the test distance and the antenna height are cooperatively determined, the grazing incidence angle theta between an antenna A and a target T is made to be 0 degree, and the optimal test site layout is achieved; then echo signal acquisition is carried out, and under the same system configuration, echo signals of a background environment, a to-be-measured target and a standard calibration body with a known RCS value are measured in sequence; and then data preprocessing is carried out, and finally RCS calibration calculation is completed. The antenna and the target center are adjusted to the same height, the irradiation condition of the zero grazing incidence angle is achieved, the interference principle of a ground reflection field is ingeniously utilized, the double advantages of the high signal-to-noise ratio and the high accuracy are effectively considered, and the method is high in engineering practicability, easy and convenient to operate and high in stability.

The invention provides a vehicle blind area monitoring signal detection method and device, a medium and equipment, and the method comprises the steps: obtaining the test data of a to-be-detected vehicle, calculating the longitudinal test distance of the to-be-detected vehicle according to the test requirements of the to-be-detected vehicle, and controlling the to-be-detected vehicle and an auxiliary vehicle to run through the combination of a test starting point and the longitudinal test distance. The method comprises the following steps: performing a blind area monitoring signal detection test on a to-be-detected vehicle, collecting operation data and blind area monitoring signals of the to-be-detected vehicle and operation data of an auxiliary vehicle in the test process, and calculating distance information between the to-be-detected vehicle and the auxiliary vehicle according to the operation data of the to-be-detected vehicle and the operation data of the auxiliary vehicle; and in combination with the blind area monitoring signal of the to-be-detected vehicle, the detection result of blind area monitoring of the to-be-detected vehicle is determined, so that the detection precision and efficiency of the blind area monitoring signal of the vehicle are improved.

The utility model provides a test system for radar target detection. The test system for radar target detection comprises a base which is provided with a guide rail in the length direction; the target simulation device is arranged on the guide rail in a sliding mode, the target simulation device comprises a plurality of moving tables arranged in the height direction of the target simulation device, and the moving tables are configured to translate in the height position of the moving tables in the direction perpendicular to the guide rail; one or more test radio frequency front ends selectively arranged on the mobile station; and the tested radar device is also slidably arranged on the guide rail, is spaced from the target simulation device along the guide rail, and is used for arranging the tested target radar, so that the test distance is adjusted through the movement of the target simulation device and the tested radar device on the guide rail. The scheme of the utility model can neglect the size of the radio frequency front end, is suitable for 3D millimeter wave radar and 4D millimeter wave radar detection, and can reduce radar detection cost and space requirements.

The invention relates to the field of chip production equipment, in particular to a chip variable-pitch conveying device which comprises a bottom plate, a positioning lead screw and a sliding rod are arranged above the bottom plate, the positioning lead screw is driven by a positioning motor to rotate, a sliding table is further arranged above the bottom plate, a threaded pipe and a sliding pipe are fixed to the bottom of the sliding table, and the threaded pipe and the sliding pipe are fixed to the bottom of the sliding table. The positioning lead screw penetrates through the threaded pipe and is in threaded connection with the threaded pipe, the sliding rod penetrates through the sliding pipe and is in sliding connection with the sliding pipe, a supporting table is arranged above the sliding table, supporting shafts are symmetrically fixed to the two sides of the supporting table, and the supporting shafts penetrate through the supporting table at the corresponding positions and are rotationally connected with the supporting table. Wherein one supporting shaft is fixed to the output end of the rotating motor, and a positioning rod is further fixed to the supporting table. According to the device, the adjacent fixing seats can be staggered, and the distance between the adjacent test chips can be adjusted during testing, so that the distance between the chips on the material disc is adjusted to meet the testing distance of the testing device.

This application discloses a method, device, medium, and product for displaying visual acuity test targets based on a smart device, relating to the field of visual acuity testing. The method includes acquiring the screen pixel density value of the terminal device; determining the display pixel height of the letter "E" at each visual acuity level based on the screen pixel density value, the test distance corresponding to the test mode, and a preset visual acuity level chart; and dynamically rendering graphic targets on the screen of the terminal device according to the display pixel height of the letter "E" at each level. This application can accurately display graphic sizes consistent with standard visual acuity charts on the terminal device, thereby improving the accuracy of visual acuity testing.

The application discloses a kind of coordinate conversion method and system based on laser radar and UTM projection, belong to indoor V2X simulation test technical field, including: data preprocessing;Local coordinate acquisition;Benchmark establishment and parameter calibration;Coordinate mapping;Inverse projection processing.The application is significantly superior to traditional linear conversion method in positioning accuracy, stability and robustness to test distance;The effectiveness of the method of the application is derived from its strict UTM projection inverse solution, which accurately compensates the geometric deformation introduced by the earth curvature in long-distance coordinate mapping, thereby providing a practical technical solution for carrying out high-precision, high-reliability V2X test in indoor environment.

An OTDR-based optical cable test method: measuring an optical cable by means of the maximum test pulse width satisfying the maximum gain of the optical cable, and acquiring test curve data and a corrected event start point and an event end point of each signal change event thereon; on the basis of the corrected event start points and the event end points, acquiring a normal optical cable segment in the test curve data; fitting the test curve data to obtain the optical cable length of the optical cable; on the basis of the optical cable length, acquiring a test distance of the optical cable; and, on the basis of the normal optical cable segment, acquiring the minimum test pulse width for an optical cable test. Compared with the prior art, directly using the maximum test pulse width that can meet the maximum gain of the optical cable to measure and obtain the test curve data, which can reflect the measurement situation of the optical cable at the maximum gain, can quickly acquire at a time various parameter information that needs to be set for the test, so as to improve the accuracy and efficiency of the optical cable test. Further provided are an OTDR optical cable test system, an optical time domain reflection device, and a storage medium.

The utility model discloses a small-size printed circuit board (PCB) wide-range linear displacement sensor, which relates to the technical field of linear displacement sensors, comprises a fixing part, a fixing part matching part and a PCB, and is characterized in that the PCB comprises at least one group of exciting coils and induction coils, the excitation coil is arranged on the outer side of the induction coil in a surrounding manner; a transverse shaft is arranged on one side of the fixing part matching part, the fixing part matching part is independently fixed on the periphery of the transverse shaft, the fixing part is arranged on the fixing part matching part, the fixing part is provided with induction belts in the measured displacement direction, the number of the induction belts is consistent with that of the induction coils, and the positions of the induction belts correspond to those of the induction coils. According to the utility model, the structure is simple, the cost is low, the space size of the PCB is small, the PCB is used as a moving part, the movement is more stable, the parallelism of the PCB and a fixed part is easier to ensure, the test distance can be increased under the condition that the length of the PCB is limited, and the test precision is higher.

The invention relates to the technical field of packaging product performance detection, in particular to EPE pearl wool packaging product performance detection equipment which comprises a base, a rotating clamp, a controller, a distance adjusting mechanism, a crank sliding block mechanism, an impact base, an impact mechanism and a limiting mechanism. The controller is installed on the front side of the top of the base and is configured to drive the rotating clamp to rotate, and the distance adjusting mechanism is installed on the right side of the top of the base. The distance adjusting mechanism drives the slider-crank mechanism and the impact base to move integrally so as to adjust the testing distance, the slider-crank mechanism drives the impact base to reciprocate, and the adjusting assembly capable of accurately adjusting the pre-compression amount of the spring is matched with the mechanical automatic limiting mechanism. According to the invention, efficient, continuous and adjustable impact detection of the packaging product is realized, and the core problems of low detection efficiency, inaccurate impact force adjustment and incapability of simulating a real continuous impact working condition in the prior art are solved.