53results about How to "Reliable test results" patented technology

This disclosure provides a method, apparatus, device, and storage medium for A / B testing, relating to the field of computer technology, and particularly to the field of computer testing technology. The specific implementation scheme is as follows: Traffic is randomly divided into group A and group B, with group A and group B having equal amounts of traffic; group A is randomly and equally divided into at least two subgroups of traffic; group B is also randomly and equally divided into at least two subgroups of traffic, with each subgroup of group B having equal amounts of traffic to each subgroup of group A; the subgroups of traffic are then permuted and combined to obtain at least four pairs of subgroups; multiple comparative tests are performed using at least four pairs of subgroups of traffic to obtain the A / B test results. The A / B test results obtained using the above method are more stable and reliable compared to the test results obtained using only one pair of traffic groups.

This application relates to the field of vehicle braking component testing technology, and particularly to a calibration and testing device and method based on an electric vehicle electronic fuel dispenser. The calibration and testing device includes a fixing fixture, a wiring harness connection unit, a host computer system, a transmission unit, and a PLC control system. The fixing fixture is used to hold the electric vehicle electronic fuel dispenser to be tested. The wiring harness connection unit includes a power supply and a calibration programmer. The host computer system is connected to the calibration programmer via a universal serial bus port. The transmission unit includes a positioning fixture, a telescopic cylinder, and a servo motor. One end of the positioning fixture is fixedly connected to the servo motor, and the servo motor is fixedly connected to the telescopic cylinder. One end of the PLC control system is connected to the host computer system via a network cable. This application ensures the synchronization and consistency of calibration and testing procedures for different fuel dispensers, and allows for intuitive comparison of line graphs of test results from different angles of the same fuel dispenser, achieving fully automated operation and quantitative performance evaluation.

The utility model discloses an environmental simulation device for soft rock mass disintegration rate test, including the box for simulating environment, the box top is equipped with the box cover that can open, and the bottom surface of box cover is fixed with the sprinkling tray to the box, and the sprinkling tray is connected with the water source outside through the pipeline fixed on the box cover, and the rotatable sample stage of containing rock sample is equipped in the box, and the water wave manufacturing mechanism of simulating water wave impact rock mass is still provided in the box. The environmental simulation of the utility model is closer to the actual situation, and the comprehensiveness and accuracy of soft rock mass disintegration rate test are improved.

This invention discloses an integrated torsion and tensile testing machine, comprising a support frame. A clamping and fixing head is installed on one side of the support frame, and a power clamping device is fixedly installed on the other side of the support frame. A power drive mechanism is installed on the other side of the power clamping device, driving the power clamping device to rotate. Two sets of clamping mechanisms are installed in the clamping cavity, and the two sets of clamping mechanisms are staggered and distributed in the clamping cavity, with different clamping points in the length direction. This invention integrates torsion and tensile testing structures into one, simplifying the structure, significantly reducing the size and weight of the equipment, improving mobility and applicability. Furthermore, the fixing points of the clamping mechanisms on the workpiece can be easily changed by simply adjusting the power drive mechanism. The operation is simple and requires no additional tools, eliminating the need for manual disassembly and assembly, greatly shortening the preparation and replacement time for the test, and making the testing process more efficient and smooth.

The utility model discloses a kind of detection large-sized steam turbine generator stator bar water blockage systems, including hot water tank, water supply pipeline and backwater pipeline;The hot water tank is communicated with water supply pipeline by branch pipe, the branch pipe is equipped with valve, water supply pipeline is equipped with water pump one, water supply pipeline is communicated with generator stator inlet water collector, the hot water tank is communicated with backwater pipeline by branch pipe, the branch pipe is equipped with valve, backwater pipeline is communicated with generator stator backwater collector, each stator bar is equipped with temperature measuring probe.The utility model utilizes generator stator bar under the condition of blockage, water flow rate reduces, water temperature change comparison exception to identify, according to the water temperature change of each generator bar, determine whether water blockage, detection result is accurate and reliable, equipment is simple, cost is lower, provide basis for further processing, improve the safety reliability of generator.

This invention discloses a method for fabricating and applying a formaldehyde SERS sensor based on an Au@ZIF-8 core-shell nanostructure, belonging to the field of gas detection technology. Formaldehyde has an extremely small intrinsic Raman cross section, and ordinary SERS substrates lack the ability to capture it, resulting in weak detection signals at low concentrations. This sensor uses Au@ZIF-8 core-shell nanoparticles to assemble a two-layer thin film as the SERS substrate. The Au nanoparticles (AuNPs) serve as the electromagnetic enhancement core, while the ZIF-8 shell layer enriches and sieves formaldehyde molecules. A layer-to-layer deposition method is used to construct the double-layer thin film structure to obtain optimal SERS performance. This invention solves the problems of low sensitivity, poor specificity, insufficient stability, and difficulty in rapid on-site detection in existing formaldehyde detection technologies. The detection limit is as low as 0.16 ppt, and within a wide range from 0.01 ppb to 100 ppm, the characteristic peak intensity exhibits an excellent linear relationship with the logarithm of formaldehyde concentration (R² ≥ 0.995). It can specifically identify formaldehyde and exclude interference from other VOCs, making it suitable for rapid quantitative detection of formaldehyde in practical scenarios such as indoor environments and cigarette smoke.

The application provides a test method and application for quantifying silicon-carbon and graphite capacity in a mixed electrode, and relates to the technical field of batteries. The test method uses XRD technology to obtain diffraction peak intensity of each phase of graphite in a pure graphite negative electrode sheet, calculates specific capacity constants corresponding to each phase of graphite according to the relationship between the diffraction peak intensity of each phase of graphite and the relative specific capacity of each voltage platform of the pure graphite negative electrode sheet, then obtains the diffraction peak intensity of each phase of graphite in a silicon-carbon / graphite mixed negative electrode sheet through XRD, combines the calculated specific capacity constants corresponding to each phase of graphite, measures the real specific capacity contribution of silicon-carbon and graphite under each SOC condition in the mixed negative electrode sheet, and calculates the lithium intercalation amount of the negative electrode material according to theoretical calculation. The test method can be applied to the determination of the silicon-carbon and graphite capacity in silicon-carbon / graphite mixed electrodes with different silicon doping ratios, the test result is real and reliable, continuous and stable, and the test time can be saved.

The utility model relates to a kind of multi-parameter detection tool for engine aluminum elbow pipe, including bottom plate, bottom plate is equipped with and the support platform of the flange end surface of aluminum elbow pipe lower end is attached, support platform is equipped with a pair of with the positioning pin of the flange two sides connecting hole cooperation of aluminum elbow pipe, support platform side is equipped with the through gauge pin for inserting the flange hole of aluminum elbow pipe flange middle, support platform side is equipped with the compression device that aluminum elbow pipe flange is fixed on support platform by compression;Bottom plate top is equipped with the first detection rod and second detection rod for respectively inserting the lower part through-hole and middle assembly hole of aluminum elbow pipe, bottom plate top is also equipped with semicircular detection shell with the upper end pipe orifice outer contour of aluminum elbow pipe adaptation and can rotate around its own axis line.The utility model relates to a kind of multi-parameter detection tool for engine aluminum elbow pipe, and it is reasonable in design, convenient and practical, realizes once clamping positioning, multi-parameter rapid detection, clamping stable can prevent deformation, detection result is reliable, detection efficiency is high, detection process standardization, improves production rhythm and consistency.

The application discloses a method, system and device for detecting Tau protein based on machine learning of surface enhanced Raman spectroscopy, and the method comprises the following steps: S1, constructing a SERS signal probe with minimum initial Raman signal; S2, mixing a sample to be detected with the SERS signal probe, and collecting SERS spectra of the mixed system by using a Raman spectrometer; S3, pre-processing the collected SERS spectra, wherein the pre-processing comprises baseline correction, feature peak identification and minimum-maximum normalization processing in sequence, so as to obtain standardized spectral data; and S4, inputting the standardized spectral data into a machine learning regression model which is trained in advance, and automatically outputting a concentration value of Tau protein in the sample to be detected based on the input spectral characteristics by the machine learning regression model. The application can quantitatively detect phosphorylated Tau protein quickly, accurately and with low detection limit under the premise of keeping high specificity, and has high clinical conversion potential.

This application relates to the technical field of terminal block assembly, specifically to an automated assembly equipment for fuse terminal blocks, comprising a transport mechanism, a pressure plate loading mechanism, a copper terminal block loading mechanism, a lower terminal block loading mechanism, a bolt loading mechanism, and a riveting mechanism. The transport mechanism includes a transport drive source, a transport track, and a transport seat. The transport track is used for placing the transport seat and extends along the driving direction of the transport drive source. The transport seat has a placement groove for placing materials, including a pressure plate placement groove for placing pressure plates. A pad is formed on the bottom wall of the pressure plate placement groove, and the pad is used to abut against the short raised end. The lower surface of the transport seat also has a riveting hole communicating with the pressure plate placement groove. The pressure plate loading mechanism, the copper terminal block loading mechanism, the lower terminal block loading mechanism, the bolt loading mechanism, and the riveting mechanism are arranged along the driving direction of the transport drive source.

The application relates to the technical field of electronic component reliability test, in particular to a universal discrete structure optocoupler aging test circuit and a test method.The test circuit comprises the following: one end of an adjustable power supply VC is connected to the collector of a transistor in a to-be-tested optocoupler through a sampling resistor Rs; the other end is connected in series with an adjustable power supply VB and is connected to the emitter of the transistor through a feedback resistor R2; the series connection point COM of one end of the adjustable power supply VB and one end of the power supply VC is connected to the anode of a light-emitting diode in the to-be-tested optocoupler through a current-limiting resistor R1, and the other end is connected to the cathode of the light-emitting diode through the feedback resistor R2; a switch K is arranged between the feedback resistor R2 and the adjustable power supply VC.The test circuit can realize independent aging of the input and output parts of the optocoupler, can apply stress conditions most suitable for the specifications of the diode and the transistor respectively, the test result is more real and reliable, and a special test board does not need to be made for each type of optocoupler, so that the hardware cost and design complexity can be reduced.

The application discloses a kind of detection devices of pure electric vehicle shift component performance, including detection seat body, workpiece clamping device, shift stroke detection device and two shift force detection devices;Workpiece clamping device is located on detection seat body, workpiece clamping device includes positioning clamping device and shift knob connecting device, positioning clamping device is used to fix shift component on detection seat body, shift knob connecting device is used to connect shift knob on shift component;Shift stroke detection device is connected with shift knob connecting device, for detecting the activity stroke of shift knob;Two shift force detection devices are respectively connected at the two ends of shift knob connecting device, and are respectively used to detect left shift power and right shift power of shift knob.The present application aims to provide a kind of detection device, can simultaneously realize automatic clamping, electrical connector automatic docking, shift stroke test, shift force test.

The application belongs to the technical field of biology, and discloses a hybridoma cell strain 2F8 secreting a calmodulin 2 monoclonal antibody, a specific monoclonal antibody, and preparation and application. The hybridoma cell strain 2F8 secreting the calmodulin 2 monoclonal antibody is classified and named as 2F8, and is preserved in the China General Microbiological Culture Collection Center on April 9, 2025, with a preservation number of CGMCC No.46343. The application also provides the calmodulin 2 monoclonal antibody secreted by the hybridoma cell strain 2F8 and a polynucleotide encoding the calmodulin 2 monoclonal antibody. The antibody has specific recognition ability for the calmodulin 2, and is suitable for immunological detection, in particular, Western-blot and immunohistochemical detection. The antibody can be used for preparing a reagent, a kit or other immunological detection product for detecting the calmodulin 2, and has practical application value.

This invention discloses a tangential flow filtration separation device and a method for determining the drug content of liposomal drugs, relating to the field of liposomal drug filtration and determination technology. The device includes a filtration separation component, a gas control component, a drive component, and system piping and valve components. The filtration separation component includes a porous membrane filtration unit, with the inner cavity of the membrane forming a mother liquor flow path, and the outer cavity connected to a filtrate collection unit. The drive component is connected to the mother liquor flow path, and the gas control component is also connected to the mother liquor flow path. The system piping and valve components connect the filtration separation component, the gas control component, and the drive component to form a closed-loop flow path. This invention solves the problems of existing methods, such as difficulty in efficiently and stably separating free drugs from liposomal components, cumbersome operation, easy liposomal leakage, and sample loss and dilution, which seriously affect the accuracy of detection.

The application discloses a test platform, a method and application for monitoring a metal material heat treatment process in situ, wherein the test platform comprises a sample environment control system, a small-angle neutron scattering system, an electrical resistivity and temperature test system and a comprehensive control and collection system, the platform can perform in-situ macroscopic detection on phase transition / precipitation behavior of a metal bulk material in a heat treatment process, is simple to operate, is widely applicable, can measure a temperature range of RT-1200 DEG C, can be additionally provided with a vacuum or a protective atmosphere environment, test results are composed of two parts of electrical resistivity and small-angle scattering results, and mutual interference between the test results is effectively overcome, and the test results are more accurate and reliable. The method is suitable for obtaining relevant quantitative information of precipitation behavior of a metal material in a heat treatment process, and provides a novel and reliable in-situ detection and analysis technology for in-situ tracking and quantitative analysis of phase transition or precipitation behavior of a metal material in a heat treatment process.

This application discloses a parameter acquisition method for an oscillation waveform detection system, relating to the field of power system control technology. By accurately acquiring parameters such as the equivalent inductance, capacitance, resistance, and minimum test voltage of the transformer winding under test, as well as the maximum and minimum oscillation frequencies of the oscillation waveform detection system, the lower limit of the input impedance of the waveform acquisition module, the upper limit of the range, the upper limit of the output voltage amplitude of the DC power supply, and the maximum allowable output current, the method obtains the equivalent total capacitance of the oscillation waveform detection system, the series capacitance of the upper and lower arms of the voltage divider, the first capacitance of the waveform adjustment capacitor, the second and third capacitances of the upper and lower arms of the voltage divider, and the resistance of the current-limiting resistor. This avoids uncertainties arising from empirical design, ensures the stable and controllable quality of the generated oscillation waveform, and guarantees consistent and reliable detection results on transformers of different capacities and voltage levels.

The application discloses an aero-engine nozzle control accessory test system and method, comprising: a simulation actuator, which is internally provided with a plurality of independent hydraulic cavities, for simulating the volume characteristics of a real engine guide vane actuator cylinder; a displacement detection assembly, comprising a linear displacement sensor and an angular displacement sensor arranged on the simulation actuator; an electronic control unit, which is signal-connected with the displacement detection assembly; a hydraulic control module, comprising a pressure regulating unit and an oil path switching unit, which are communicated with each cavity of the simulation actuator; wherein the electronic control unit is configured to apply controllable hydraulic pressure to the corresponding cavity of the simulation actuator by controlling the pressure regulating unit, and selectively guide the hydraulic oil output by the test piece to the simulation actuator or the flow monitoring unit by the oil path switching unit, while receiving the feedback signal of the displacement detection assembly to form a closed-loop control.

The application discloses a non-contact coronary heart disease evaluation device based on a face video and belongs to the technical field of intelligent medical treatment. It comprises a data extraction module, which is used for extracting a video pulse signal of a certain feature region in a target object video stream and a frame image corresponding to the video pulse signal as a training set, so as to train a first prediction model and a second prediction model; a judgment module is used for outputting an evaluation result according to the overall uncertainty judgment result of the first prediction model and the second prediction model; the application comprehensively considers two factors of pulse features and facial features, respectively evaluates the uncertainty of the prediction of two models, selects the prediction result of the smaller uncertainty as the final coronary heart disease detection result, more comprehensively evaluates the coronary heart disease related features, and makes the detection result more reliable.

This invention provides a method for detecting and calculating the austenite content in steel based on a permeability meter, relating to the fields of steel and electromagnetics. Based on the theoretical differences in saturation magnetization of different phases in ferromagnetic materials, this invention establishes a theoretical calculation model and detection method for measuring austenite content using a permeability meter. A standard-prepared sample is placed in a magnetic pole shoe, and the magnetic field strength H corresponding to the maximum permeability of the ferromagnetic material is first measured. μ Then at ≥1.5H μ Under a magnetic field strength of J, the polarization intensity of the magnetic field strength at multiple points was measured at continuous intervals. m Then, based on the saturation magnetization approximation law and derivation law, the saturation magnetization Js is fitted and solved. Finally, the austenite content is determined according to the theoretical calculation model of austenite content. The method described in this invention solves the influence of the constantly changing effective magnetic path length of traditional magnetometers on the measurement results. The method for determining austenite content is simple, has a solid theoretical basis, high measurement accuracy, and strong data repeatability.

The utility model discloses a silica gel button high and low temperature resistant testing arrangement, including the shell, the inner wall middle part of shell is equipped with the test board, the upside of test board is equipped with the button test groove, the bottom wall of button test groove is equipped with the button shaft of symmetrical distribution, still include temperature control subassembly and press subassembly, temperature control subassembly includes arc cover and low temperature air pipe, the inside of shell is equipped with arc cover, the inside of arc cover is equipped with heating assembly, arc cover is located the front side of button test groove, the left side wall of shell is equipped with low temperature air pipe, and low temperature air pipe is located the left side of button test groove, press subassembly sets up in the inside of shell, the front side of shell is equipped with singlechip, and the input of singlechip is electrically connected external power supply. The utility model can accurately simulate high and low temperature environment and highly restore real pressing operation, and the performance of silica gel button under different temperatures is detected comprehensively and accurately.

The present application relates to earthwork backfill engineering technical field, specifically relates to a kind of super large particle size wide gradation soil and stone mixture maximum dry density determination method, using large tonnage convex block roller compaction or dynamic compaction compaction, obtain the maximum dry density under different gradation conditions, and under different gradation conditions, different more than 20mm particle content, without technical treatment to the super-diameter particles in the original gradation of soil and stone mixture.In construction, with the measured gradation curve and more than 20mm particle content, compared with different gradation conditions, and under different gradation conditions, different more than 20mm particle content conditions, the larger of the two under the closer gradation condition and the closer gradation condition more than 20mm particle content is the maximum dry density.The maximum dry density determined by this method is closer to the actual construction condition, which can truly, objectively and accurately reflect the maximum dry density of soil and stone mixture, and ensure the construction quality of the project.

This invention discloses a system and method for testing the development laws of gas reservoirs, comprising: a formation simulation device containing an experimental core of a predetermined length; an edge water simulation device connected to the core inlet for simulating edge water intrusion during the depletion development stage; an injection-production simulation device equipped with a first gas inlet module and a condensate gas sample inlet module at the core inlet, and a backpressure module at the core outlet, wherein the first gas inlet module is used to establish a bound water saturation state in the core, and the backpressure module is used to promote the production of produced fluids; a measuring device connected to the backpressure module for measuring the produced fluids; and an experimental control device for obtaining measurement data and calculating water intrusion during the depletion development stage by controlling the formation simulation device, the edge water simulation device, and the injection-production simulation device. This invention fills the gap in research on the water intrusion laws during the injection-production stage of edge water condensate gas reservoirs.

The present application relates to a kind of multi-purpose blowout preventer compression test device, comprising first joint and second joint.First joint is connected by first stepped ring structure and second stepped ring structure, second joint is connected by third stepped ring structure and fourth stepped ring structure, first joint and second joint are connected with the two ends of blowout preventer.The compression test tool is connected with blowout preventer, then it is connected with compression equipment through third outer thread end and fifth outer thread end, then liquid is pressed into blowout preventer through the center hole of second stepped ring structure and fourth stepped ring structure, keep a certain time, and compression test is carried out.In addition, by changing the connection ring of first joint and second joint connected with blowout preventer, connection with blowout preventer of different specifications and sizes can be realized, by changing the connection ring connected with compression equipment, it can be applied to different types of compression equipment, and the tool has strong applicability.

The present application relates to the field of electrochemical analysis and detection, and discloses a method for detecting mycotoxin based on CRISPR-Cas12a system, comprising: (1) reacting single-stranded DNA with recognition DNA of mycotoxin to obtain single-stranded-recognition DNA complex, wherein the single-stranded DNA is complementary to the recognition DNA; (2) mixing the single-stranded-recognition DNA complex and the sample to be tested which may contain mycotoxin to obtain reaction mixture I after reaction II, and mixing the reaction mixture I with auxiliary DNA containing activated DNA fragments to obtain reaction mixture II after reaction III, wherein the auxiliary DNA is complementary to the single-stranded DNA; (3) mixing the reaction mixture II with CRISPR-Cas12a system solution to obtain reaction solution after activation; (4) adding the reaction solution dropwise to an electrochemical biosensor to perform reaction V, and detecting the electrochemical signal of the electrochemical biosensor after reaction V is completed. The method has high sensitivity and high selectivity, and is simple and rapid to operate.

This invention discloses a waterproof testing device for electrical control cabinets. The invention relates to the field of control cabinet testing technology and includes a base; a water tank filled with water is fixed to the left side of the top surface of the base; a frame with a concave structure is fixed to the top surface of the base, and a first hydraulic cylinder is fixed to the top surface of the inner wall of the frame. A base block with a rectangular block structure is fixed to the extended end of the first hydraulic cylinder, and two spring rods are fixed to the bottom surface of the base block. Multiple testing methods are combined to ensure comprehensive testing: a first testing component performs basic sealing tests by observing air bubbles after immersing the control cabinet in the water tank; a second testing component increases the pressure inside the water tank by connecting an air inlet pipe to an air pump, allowing for more in-depth leakage testing. The two testing methods work together to test the sealing of the control cabinet under different pressure environments, ensuring accurate and reliable test results.

This invention proposes an apparatus and method for evaluating the thermal oxidative stability of liquid compounds based on pressure measurement, belonging to the technical field of chemical analysis experimental apparatus. The apparatus includes an oxygen supply unit, a reaction unit, a cooling unit, and a pressure measurement unit. The oxygen supply unit controls the vacuuming and oxygenation of the apparatus. The reaction unit achieves precise temperature control and homogenization of the reaction liquid through a high-temperature heating circulating bath and a magnetic stirrer. The cooling unit eliminates interference from volatile products on pressure measurement through a cryogenic trap. The pressure measurement unit collects system pressure data in real time using a high-sensitivity pressure transmitter and transmits it to a computer. The method involves evacuating the apparatus and then oxygenating it to a set pressure, heating and maintaining the reaction temperature, monitoring system pressure changes through the pressure transmitter, and recording data and calculating oxygen consumption on the computer. This invention can track the oxygen consumption rate in real time, reveal the oxidation pattern, and is suitable for rapid and accurate evaluation of the thermal oxidative stability of various liquid compounds.

The application relates to a dual-wavelength Raman-capacitance integrated fertilizer solution component on-line detection device. The Raman spectrum detection module and the capacitance sensor module are electrically connected with a controller respectively. The Raman spectrum detection module comprises a Raman probe, an optical switch, a laser light source, a monochromator, a charge coupled device and a Raman spectrum pipeline. The optical switch, the laser light source, the monochromator and the charge coupled device are electrically connected with the controller respectively. The charge coupled device, the monochromator, the laser light source, the optical switch and the Raman probe are electrically connected in sequence. The probe end of the Raman probe is connected with the Raman spectrum pipeline. The capacitance sensor module comprises a interdigital capacitance pipeline. The Raman spectrum pipeline and the interdigital capacitance pipeline have the same inner diameter and are connected at the end. The application combines the dielectric frequency method and the Raman spectrum method, can give full play to the advantages of both methods, can realize comprehensive, on-line and rapid detection of fertilizer solution component information, and lays a foundation for improving the intelligent level of the water and fertilizer integrated system.

This utility model discloses a high-speed X-ray inspection machine with dual-drive collaborative control, including a signal receiving device, a signal transmitting device arranged above the signal receiving device, and a product transmission line arranged between the signal receiving device and the signal transmitting device. The product transmission line includes two bases, a first transmission frame, a second transmission frame, a fixed frame, a translation drive mechanism, and a transmission drive mechanism. The two bases are arranged parallel and spaced apart, and each base has a straight slide rail arranged along its length on its top. This utility model, by employing a dual-motor drive, can provide stronger power, achieve faster scanning speed and inspection efficiency, and meet the rapid inspection needs in high-speed production lines, demonstrating strong practicality.

The utility model provides a kind of for satellite antenna radiation surface detection's automation device, it is related to radiation surface detection technical field, comprising: work platform, the top of the work platform is fixedly connected with support frame, the top of the support frame is provided with telescopic traverse mechanism;The telescopic traverse mechanism includes first electric telescopic link, the bottom of the first electric telescopic link is fixedly connected with transmission table, the bottom of the transmission table is fixedly connected with configuration plate.The utility model in, unique telescopic traverse mechanism can be flexibly adjusted the position of detection probe in two-dimensional space, can adapt to the detection demand of different specifications, different shape satellite antenna radiation surface, effectively eliminate detection blind area, the spring design of flexible detection mechanism, so that detection probe can automatically adjust pressure according to the actual situation of radiation surface, both ensure the accuracy of detection data, also avoid damage to antenna radiation surface.