1196results about How to "Meet testing needs" patented technology

The invention discloses a near infrared spectrum rapid detection system and a real-time analysis method, and the system comprises an environmental parameter and spectrum information collection module, a data processing module, an intelligent evaluation model construction and optimization module, a real-time analysis and evaluation module, and a result feedback and optimization module. The intelligent evaluation model construction and optimization module is used for constructing an intelligent evaluation model by fusing a neural network and a support vector machine, taking the characteristic vector information which is obtained after processing and represents environmental parameters and is associated with infrared spectrum information as input, and taking an expected evaluation result which is associated with the infrared spectrum information of a sample as output; training the intelligent evaluation model; and the real-time analysis and evaluation module is used for inputting the environment parameter information and the infrared spectrum information which are acquired in real time into the trained intelligent evaluation model to obtain an evaluation result of the infrared spectrum information. The system and the method have the advantages of high detection speed, high accuracy and the like.

An intelligent cable bending test device disclosed by the present invention comprises a cable cylinder used for unwinding or winding a cable, a test wheel seat, a traction seat, a first adjusting assembly and a second adjusting assembly, the cable comes out of the cable cylinder, passes through a test wheel on the test wheel seat and then is connected to the traction seat, the test wheel carries out bending limiting on the cable, and the first adjusting assembly is connected with the second adjusting assembly. The test wheel seat moves relative to the base to form a bending test on a cable, the first adjusting assembly is provided with a first contact wheel, the second adjusting assembly is provided with a second contact wheel, and the first contact wheel and the second contact wheel clamp the cable and then limit the cable. The first adjusting assembly and the second adjusting assembly do not rotate synchronously so that the cable can be in a twisted or non-twisted state, bending performance testing of the cable in different twisted states is achieved, more accurate cable bending performance parameters are obtained, and meanwhile more abundant bending testing scenes are provided.

The invention relates to the technical field of detection, and provides a thick plate titanium alloy welding seam self-adaptive sensitivity ultrasonic detection method which comprises the following steps: designing a combined ultrasonic transducer, designing a detection system, testing and calibrating, testing a signal-to-noise ratio, scanning and evaluating. The detection system comprises a multi-channel ultrasonic detection collector, upper computer software and a combined ultrasonic transducer. Compared with the prior art, the self-adaptive sensitivity ultrasonic detection method for the thick plate titanium alloy welding seam has the advantages that the combined ultrasonic transducer is designed, thick plate titanium alloy welding seam detection and material acoustic performance evaluation are synchronously carried out, and the sound attenuation coefficient is fed back to a welding seam detection channel in real time by using upper computer software; and the detection sensitivity is adjusted in real time, so that the problem of inaccurate defect quantification caused by sensitivity difference due to non-uniform materials is solved, and accurate evaluation on the welding defects is realized.

The invention relates to the technical field of optical system detection devices, in particular to a large-aperture standard reflector adjusting device, which specifically comprises a bottom plate, an orientation rotating device, a pitching rotating device and a reflector fixing device, and is characterized in that the orientation rotating device is arranged above the bottom plate; the pitching rotating device is arranged above the azimuth rotating device; the reflector fixing device is connected to the pitching rotating device, so that the azimuth rotating device can adjust the azimuth angle of the reflector fixing device, and the pitching rotating device can adjust the pitching angle of the reflector fixing device; wherein the azimuth rotating device and the pitching rotating device have a self-locking function. Therefore, under the condition that the surface type precision of the mirror surface of the standard reflecting mirror is ensured, the standard reflecting mirror can be precisely adjusted at a large angle in the azimuth angle and the pitching angle, and the detection requirement of an optical system is met.

The invention relates to the technical field of FFC wire rod conductivity testing, in particular to testing equipment and a testing method for FFC wire rod processing. Comprising a base and supporting legs on the lower surface of the base. The upper surface of the base is fixedly connected with a vertical plate; one side of the vertical plate is fixedly connected with a controller; an upper driving roller and an upper driven roller are rotationally connected to the side, away from the controller, of the vertical plate at the same horizontal height. The upper driving roller is driven by an upper motor; the outer walls of the upper driving roller and the upper driven roller are in transmission connection with an upper conveying belt; a lower driving roller and a lower driven roller are rotationally connected to the side, deviating from the controller, of the vertical plate at the same horizontal height; according to the FFC wire testing device, FFC wires are continuously placed through the storage grooves in the lower conveying belt, and the testing device can continuously test the FFC wires through transmission of the upper conveying belt and the lower conveying belt, so that the testing is more continuous, and the testing efficiency of the existing processed FFC wires is improved.

The invention discloses a shallow sea environment intelligent monitoring system and method using multi-buoy combination, and relates to the technical field of marine environment monitoring. The monitoring system comprises an equipment combination module, a response area division module, an area change tracking module, an area correction module and an area detection module, and is technically characterized in that a buoy is divided into a plurality of gradient intervals according to the distance between the buoy and the nearest coast as the standard; then, according to the change condition of the concentration of the detected object along with time in the same gradient interval or different gradient intervals, the movement direction and the movement speed of the detected object are analyzed, so that the diffusion position of the detected object is predicted in advance, a basis is provided for capturing aquatic products or treating the environment, and the variability of the marine environment is adapted; and on the basis of calling the historical diffusion trend of the detection substances with the same or similar concentration from the database, the diffusion trend of the detection substances is corrected, so that the analysis accuracy of the diffusion trend of the detection substances is ensured.

The invention provides a heat exchange piece testing device, a testing system and a testing method. The heat exchange piece testing device comprises a compressor, a condenser, a subcooler, a first temperature and pressure sensor, a first expansion valve, a second temperature and pressure sensor and a second expansion valve, a first fan is arranged on one side of the condenser, a second fan is arranged on one side of the subcooler, and an inlet of the condenser is communicated with an outlet of the compressor. A first flow path is arranged between an outlet of the condenser and a first port of the heat exchange piece, a second flow path is arranged between a second port of the heat exchange piece and an inlet of the compressor, and in a refrigeration mode, the first flow path sequentially passes through the subcooler, the first temperature pressure sensor and the first expansion valve; the second flow path sequentially passes through a second temperature pressure sensor and a second expansion valve, the rotating speed of the first fan is adjustable to control the condensing pressure, the rotating speed of the second fan is adjustable to control the degree of supercooling, the opening degree of the first expansion valve is adjustable to control the degree of superheat, and the opening degree of the second expansion valve is adjustable to control the evaporation pressure.

The invention discloses wafer mass detection equipment and method.The wafer mass detection equipment comprises an equipment front-end module, a detection platform, a photoluminescence detection module and a control module, and a plurality of wafer carrier boxes of different sizes are arranged in a stepped mode in the equipment front-end module and used for containing wafers of different sizes; the test positions of different sizes in the detection platform are used for placing wafers on the wafer carrier box, the first detection module is used for detecting the placement positions of the wafers at the test positions, and the control module controls the equipment front-end module to place the wafers at the corresponding test positions according to the sizes of the wafers by obtaining the wafers of different sizes in the wafer carrier box. According to the invention, the detection platform is provided with the photoluminescence detection module, the placement position of the wafer at the test position is obtained, the wafer on the detection platform is controlled to focus with the photoluminescence detection module, and the photoluminescence detection module is controlled to detect the wafer based on the preset imaging detection parameters of the wafer, so that the detection requirements of LED wafers of different specifications are met, and the LED wafer detection efficiency is improved.

The invention belongs to the technical field of force-magnetic characteristic testing, and particularly relates to a hysteresis and magnetostrictive property testing system and method under stress loading. The system is composed of a plate-shaped test piece, a stress loading module, a magnetic field loading module, a signal acquisition module and a computer. The stress loading module comprises a mounting plate, a T-shaped piece, a clamp, an L-shaped piece, a sliding module, a cushion block, a pressure sensor, an electric push rod and a driver; the magnetic field loading module comprises a U-shaped magnet yoke, a signal generator, a power amplifier, a sampling resistor and an exciting coil; the signal acquisition module comprises an induction loop, a strain gauge, a strain bridge box and a dynamic signal acquisition instrument; the method comprises the steps of test piece preparation, system assembly, parameter setting, stress loading and signal acquisition, magnetic field loading and signal acquisition, data processing and curve drawing. The test system and method can measure force-hysteresis and force-magnetostrictive properties, and have the characteristics of light weight, variable magnetic field direction and position and high test precision.

The invention discloses a full-automatic intelligent multifunctional high-order nonlinear fluorescence dynamics testing method and device, and relates to the field of nonlinear optics and nano photonics. An optical testing device composed of an exciting light generation module, an automatic power regulation module, an exciting light modulation module, a sample scanning module, a data acquisition and analysis module and an intelligent control module is established, and under the excitation of incident laser, based on the overall coordination of the intelligent control module, the optical testing device is established. Other modules are driven to complete the dynamic response test of a nonlinear fluorescence sample, and full-automatic intelligent, multifunctional, high-precision, simple, efficient, low-cost and universal fluorescence dynamic test analysis is realized. The problems that traditional manual operation wastes time and labor and the testing precision is low are solved. In addition, the multifunctional integration of the fluorescence response curve, the fluorescence rise time, the fluorescence lifetime and the fluorescence imaging effectively improves the test efficiency and the application scene, and greatly reduces the system cost.

The invention provides a diffuse reflection target plate. The diffuse reflection target plate comprises a substrate; a plurality of microstructures; wherein the plurality of microstructures are distributed on the substrate; the substrate has a first reflectivity, and the microstructure has a second reflectivity; the first reflectivity is different from the second reflectivity; the target reflectivity of the diffuse reflection target plate is related to the first reflectivity and the second reflectivity. According to the diffuse reflection target plate, reliable large-range reflectivity can be achieved, and the test requirement is met. By changing the specification and / or distribution mode of the microstructure, the duty ratio of the substrate can be adjusted, then the target reflectivity of the diffuse reflection target plate is adjusted, the reflectivity range from 0% to 100% is covered, and flexibility and reliability are achieved.

The invention discloses a method for automatically testing an interface based on RPA. The method comprises the following steps: making a test plan; building a test framework; compiling a test script; performing integrated testing; executing the test script; analyzing a test result; and maintaining the test script. Based on an RPA tool, through a graphical interface and predefined operation, a tester can create an automatic test script without writing any code, and the tester can define a complex test process only through simple dragging, clicking and configuration; an RPA tool is generally designed to be visual and easy to use, even a tester without any programming experience can quickly master the RPA tool, and the tester can master the basic skill of automatic testing through simple training and practice; the RPA has a unique verification mode for the login system needing to be verified, targeted system verification can be carried out, and the login interface can obtain the token conveniently.

The invention discloses a multi-range capacitor capacitance value measuring circuit and method based on constant current state charging and discharging, and relates to the technical field of capacitor testing. The circuit comprises a power supply module, the output end of which is electrically connected with one end of a capacitor to be tested; the input end of the resistance shunting module is electrically connected with the other end of the capacitor to be measured; the input end of the integration module is electrically connected with the output end of the resistance shunting module; the input end of the sampling module is electrically connected with the output end of the integration module; the control module is electrically connected with the power supply module, the resistance shunting module, the integration module and the sampling module; and the first input end of the adjustable window threshold comparison module is electrically connected with the output end of the integration module, and the second input end of the adjustable window threshold comparison module is electrically connected with the control module. According to the circuit provided by the embodiment of the invention, multi-range capacitance value testing can be realized.

The invention discloses an ammonia nitrogen detection system and an application method thereof, and ammonia nitrogen detection test paper, the ammonia nitrogen detection system is prepared by the following steps: step SA1) preparing a dipping mixed solution, the dipping mixed solution comprises: a potassium sodium tartrate solution with a concentration of 3-60 g / L; a sodium salicylate solution with a concentration of 20-320 g / L; the concentration of the sodium nitroprusside solution is 0.1 to 0.8 g / L; and deionized water. On the basis of the principle of salicylic acid-pypocholoride spectrophotometry, the impregnated test paper, the reagent tube and the standard colorimetric card are combined, and the rapid ammonia nitrogen detection system special for medium-concentration sewage detection is successfully developed. The toxicity problem of mercury iodide in a Nessler reagent method and the toxicity problem of phenol in a phenol-pypocholoride spectrophotometric method are avoided, main reagents are non-toxic and harmless to a human body, interference of metal ions in a water sample can be effectively eliminated by adopting sodium potassium tartrate tetrahydrate as a chelating agent, and the detection stability and accuracy are improved.

The invention relates to the technical field of new energy batteries, in particular to a battery module and a pressure testing method of the battery module, the battery module comprises a pressure sensor, an integrated busbar and a battery cell module, the battery cell module comprises a plurality of stacked battery cells and an end plate arranged at the outermost battery cell, the pressure sensor is clamped between two adjacent battery cells, the pressure sensor is electrically connected with the integrated busbar, and the integrated busbar covers one side, provided with a pole, of each battery cell. According to the battery module disclosed by the invention, the pressure sensor is arranged between two adjacent battery cells, so that the requirement of detecting the battery pressure of the battery module can be met, the expansion force between the battery cells can be better detected by pressure detection data, the pressure sensor is integrated on the integrated busbar, and the data is transmitted to a BMS (Battery Management System), so that an early warning effect is achieved.

The invention belongs to the field of analytical chemistry and mathematical modeling, and particularly relates to a method for predicting and identifying whether soy sauce contains yeast extracts, which comprises the following steps: 1) taking different types of soy sauce as modeling samples; 2) carrying out decolorization pretreatment on the modeling sample; (3) carrying out spectrum scanning on the modeling sample by adopting a Raman spectrum technology to obtain original Raman spectrum information; 4) preprocessing the Raman spectrum data obtained in the step 3); 5) sampling for multiple times to establish a sparse logistic regression model, and recording important wave numbers; 6) counting wavenumber importance; 7) selecting an important wave number; 8) using TabPFN to establish a prediction model; (9) predicting and judging whether the yeast extract is added into the soy sauce sample or not by utilizing the established prediction model; compared with the prior art, the method can quickly and accurately identify whether the soy sauce such as light soy sauce and dark soy sauce contains the yeast extract or not, and is simple and quick in identification process, short in analysis time, high in accuracy and high in practicability.

The invention provides an immersed battery thermal safety management test system and method, and the system comprises a battery device disposed in an immersion box, and an immersed cooling structure is built through assembly combination. The liquid cooling circulation module is used for driving cooling liquid to flow; the charging and discharging module is used for performing a charging and discharging test or a thermal safety performance test on the battery device; the needling module is used for needling to trigger the working condition of thermal runaway; the electric control module is in signal connection with the liquid cooling circulation module, and monitors and adjusts the flow, the water temperature and the water pressure of the cooling liquid in the liquid cooling circulation module in real time; the data acquisition module is used for acquiring temperature and voltage change characteristics of the battery device; through the system and the method, thermal performance and safety performance tests can be carried out, the test requirements of different types of batteries under various working conditions can be met, the thermal performance and safety of the battery immersed liquid cooling system can be accurately evaluated under various complex working conditions, and powerful data support is provided for thermal management design and optimization of the battery.

The invention provides a transformer vibration test tool and a use method, the transformer vibration test tool comprises a vibration platform, the vibration platform is provided with an installation platform, the installation platform is symmetrically provided with two support frames, the ends of the same sides of the tops of the two support frames are connected with a connecting plate, the connecting plate is connected with a connecting piece, and the connecting piece is connected with the vibration platform. The top of a transformer is connected to the connecting piece, the transformer is located between the two supporting frames, one end of a flexible connecting piece is connected to the bottom of the transformer, and the other end of the flexible connecting piece is connected to the tops of the supporting frames. According to the test tool, accurate test and evaluation of the transformer in a simulated vibration environment are realized, and the accuracy and reliability of the transformer in a vibration test are ensured, so that the operation and maintenance cost and risk of the transformer are reduced.

The invention discloses an intelligent computer performance testing system based on a Shell script, belongs to the technical field of computer performance testing, and aims to solve the technical problem of how to improve the automation degree of computer performance testing, avoid man-machine interaction and further improve the testing efficiency and accuracy. According to the technical scheme, a test package program installation module is used for triggering and automatically installing a software test package program; the file generation module is used for generating an HPL.Dat file when the mpich software is installed; the file updating module is used for updating the HPL.Dat file generated in the process of installing the software test package program; the execution module is used for transmitting data; the test preparation module is used for providing test information for testing the performance of the computer and processing the test information; and the test item forming module is used for constructing test items according to the separated test information so as to obtain computer system performance test content and record test item information.

The embodiment of the invention provides a chip adjusting and testing device and method, and the device comprises a communication control module which is used for connecting a chip with a PC end operation platform; the PC end operation platform is provided with an automatic test module and is used for calling an automatic use case interface through an interface and editing automatic use case parameters so as to test a chip according to an automatic test case, and the PC end operation platform is also provided with a user-defined use case mode and is used for identifying a control keyword, calling a user-defined use case development sub-interface and developing the chip according to the user-defined use case development sub-interface. A user can edit the user-defined use case to generate a user-defined use case interface, so that the chip is subjected to a user-defined test according to the user-defined use case interface; and the instrument control module is used for calling a corresponding test instrument according to the test instrument type input by the PC end operation platform so as to detect the chip and generate test data. The problem that some temporary or sudden test requirements in the chip test process are difficult to meet is solved, and the effect of conveniently testing the chip according to the requirements of a user is achieved.

The invention discloses a testing machine for testing the sealing performance of a sealing pair of a control valve, which comprises a closed box body, a rotary driving mechanism, a rotary lifting assembly, a lower sample replacement block, a telescopic cylinder, an upper sample replacement block, a liquid pressure supply system, a gas pressure supply system, a leakage detection system and a data acquisition and control system, and is characterized in that the rotary driving mechanism is mounted in the closed box body; the rotary lifting assembly is located in the closed box and is in transmission connection with the rotary driving mechanism. The lower sample replacement block is mounted at the top of the rotary lifting assembly; the telescopic cylinder is installed in the closed box body, and a telescopic rod of the telescopic cylinder is fixedly connected with the rotary lifting assembly. The upper sample replacement block is mounted at the top of the closed box body and corresponds to the lower sample replacement block in position; the liquid pressure supply system is connected and communicated with the sealed cavity of the upper sample replacement block; and the gas pressure supply system is aligned with a sealing interface formed between the upper sample replacement block and the lower sample replacement block. The method can improve the applicability, quantify the sealing leakage rate of the valve, and comprehensively evaluate the sealing performance of the control valve.

The invention discloses a fabric waterproof performance testing device and a using method thereof, and belongs to the technical field of waterproof testing products, and the fabric waterproof performance testing device comprises a transparent shell, a fixing assembly, a spraying assembly and a control assembly. Wherein a display cavity is formed in the transparent shell; the fixing assembly is arranged in the display cavity, is detachably connected with the to-be-tested fabric and is used for fixing the to-be-tested fabric; the spraying assembly is arranged in the display cavity and is used for spraying water flow to the fabric to be detected; the control assembly is in signal connection with the spraying assembly, the control assembly can generate a control instruction to adjust spraying parameters of the spraying assembly, and the spraying parameters comprise a spraying mode and spraying time. The using method of the fabric waterproof performance testing device is applied to the fabric waterproof performance testing device. Through a highly visual test process, a consumer can clearly and visually observe the waterproof performance of the fabric to be tested in the test process.

The invention provides a multi-scale pest type detection method and device and electronic equipment, and the method comprises the steps: carrying out the preprocessing of collected pest images, so as to construct a pest image data set; based on a YOLOv8 model, constructing a pest image detection model; wherein a deep multi-scale convolution module is added in the trunk part of the network architecture of the YOLOv8 model; adding a scale sequence feature fusion module and a feature coding module to the neck part of the network architecture of the YOLOv8 model; training the pest image detection model to obtain a trained pest image detection model; and inputting the pest image data set into the trained pest image detection model to obtain a pest type detection result. By the adoption of the method, the problem that the multi-scale pest detection precision is limited in an existing pest image detection mode is solved.

The invention provides a lane changing safety testing device and method based on an automatic driving truck, and relates to the technical field of vehicle testing, the lane changing safety testing device based on the automatic driving truck comprises a lifting mechanism and a limiting track, the lifting mechanism comprises a supporting frame, a lifting piece and a telescopic frame, the supporting frame is installed on the limiting rail in a sliding mode, an adjusting hole is formed in the supporting frame, and the telescopic frame is of an L-shaped structure; according to the lane changing safety testing method of the automatic driving truck, the lane changing safety testing device based on the automatic driving truck is adopted to carry out lane changing testing in an automatic driving system on the automatic driving truck. According to the scheme, the track moving mechanism finally drives the first test plate to move, so that the first test plate is far away from the second test plate in the vertical state, and support is provided for the lane changing test of the automatic driving truck; and therefore, one piece of test equipment can meet the test requirements of various application scenes.

The present invention discloses a pre-test processing device, medical equipment and a detection method, wherein the pre-test processing device includes a tray having at least one limiting groove; a tray fixing fixture having a structure for installing and fixing the tray; a material supply mechanism having a structure for storing materials in batches and transferring the materials one by one to the tray; a test liquid storage mechanism having a group of containers; and an injection mechanism having a structure that can extend into any of the containers to absorb liquid and inject it into the groove of the material on the tray. This solution installs reagent strips by setting a tray, and stores batches of materials through a material supply mechanism and transfers the stored materials to the tray to meet the test needs. Combined with the injection mechanism, the test liquid in the container is automatically injected into the groove of the reagent strip on the tray, which can meet the needs of large-scale and multi-item testing, create equipment conditions for the automation of various tests, and help improve detection efficiency.

The invention relates to the technical field of testing, in particular to a path planning method and device, electronic equipment and a readable storage medium, and the method comprises the steps: obtaining test demand information; according to the test demand information and pre-generated test case information, determining a road section or an interest point matched with the test scene; and acquiring a test path passing through the road section or the interest point. According to the scheme, on the premise of not depending on testers, the test path covering the required test scene can be automatically planned, so that the efficiency of planning the test path is improved, and the cost is reduced.

The invention belongs to the technical field of online analysis of organic pollutants, and particularly relates to a device and a method for real-time online analysis of non-volatile organic pollutants. The device comprises a sample injection module, a vacuum ultraviolet lamp, an ionization source cavity, a repulsion electrode, an ion funnel, a mass analyzer and a vacuumizing module, the ionization source cavity is provided with a sample injection port, a vacuum extraction port and an ion output port, and the vacuum ultraviolet lamp, the repulsion electrode and the ion funnel are sequentially arranged in the ionization source cavity at intervals in the axis direction of the ion output port; the ion funnel is close to the ion output port; the sample injection module is arranged at the sample injection port; the vacuumizing module is arranged on the vacuum extraction opening; the ion output port is externally connected with a mass analyzer; a direct-current voltage is applied to the repulsion electrode, and a direct-current voltage and a radio-frequency voltage are applied to the ion funnel. According to the invention, the ions with relatively large initial distribution area can be focused, so that the detection sensitivity is further improved, and the detection requirements on trace non-volatile organic pollutants are met.

The invention discloses a grinding tool surface flatness detection device and detection method, and relates to the technical field of industrial automatic detection, the grinding tool surface flatness detection device comprises an external mechanism, a transmitting mechanism, a detection mechanism and a conveying mechanism, the detection mechanism is used for receiving a reflected or scattered laser beam, mapping the reflected or scattered laser beam to a receiving end of a laser recovery table, analyzing a laser signal and converting the laser signal into an electric signal; in the invention, the surface of the grinding tool is firstly cleaned by high-pressure gas to ensure the accuracy of the detection result, and when the subsequently generated laser beam irradiates the surface of the grinding tool and the emitted laser beam is mapped to the detection end of the laser recovery table, the detection result is accurately detected by measuring the intensity, frequency, phase and other parameters of the laser signal. According to the method, the micro fluctuation and the unevenness of the surface of the grinding tool can be reflected, powerful data support is provided for quality control and improvement of the grinding tool, and the intelligent detection process not only improves the automation degree of detection, but also ensures the accuracy and the reliability of a detection result.

The invention discloses a digital-real fusion test digital scene rapid generation method, and belongs to the field of high-end equipment digital test verification, and the method comprises the steps: setting a test overall target, and functions and performance indexes of a to-be-tested object; according to characteristics of a test target and a to-be-tested object, in combination with an object test process, various kinds of basic unit scene data needed by a digital test scene in a digital-real fusion test are prepared; when the data is not enough to meet the requirement of high-precision scene model generation, data enhancement operation needs to be carried out; constructing a unit scene generation model based on deep learning by using the data set and the two-dimensional diffusion model; on the basis of the generated unit scene, constructing a test scene multi-element database and constructing a test rule constraint set; and a comprehensive scene test model is rapidly generated by using deep reinforcement learning, and the complexity and coverage of the generated comprehensive test scene are evaluated and verified, so that the requirement for the overall test target is met.

The invention relates to the technical field of liquid level detection, and provides a liquid level detection method and system. The liquid level detection method comprises the following steps: sending detection light into the resonant cavity; the detection light is absorbed by the gas, and a detection light signal is converted into a photoacoustic signal; the sound acquisition device converts the photoacoustic signal into a first electric signal; the pre-amplification circuit amplifies the first electric signal; converting the amplified first electric signal into a second electric signal; and the liquid level is inverted based on the second electric signal. According to the liquid level detection method, the resonant frequency of the resonant cavity is determined by detecting the amplitude of the second electric signal, the liquid level is measured through the resonant frequency of the resonant cavity, the response speed is high, the sensitivity is high, the fine change of the liquid level can be accurately captured, and the detection precision of the liquid level is effectively improved. Meanwhile, according to the liquid level detection method, interference of factors such as turbidity, color and refractive index of liquid in the traditional liquid level detection process can be avoided, and high measurement precision can be kept for various complex liquid environments.