196 results about "Sensor field" patented technology

The invention relates to the field of sensors, and discloses an anti-electromagnetic interference dynamic compensation method for a gas sensor of power equipment, which comprises the following steps: monitoring and collecting sensor data, uploading the sensor data to a central processing unit for data fusion, and carrying out volatility analysis on the fused sensor data, so as to obtain an anti-electromagnetic interference dynamic compensation result. The change relation of the fluctuation of the sensor data along with time is monitored in real time, and the fluctuation abnormal state of the sensor data is analyzed and detected by combining a fluctuation analysis result with real-time environmental parameters, so that the monitoring duration and the monitoring frequency of the sensor data are dynamically adjusted; analyzing the contribution degree of the electromagnetic interference to the error generated by the gas sensor, detecting whether the error interferes with the measurement state of the gas sensor, and correcting the gas concentration measurement value by using a temperature and humidity-gas response coupling correction algorithm of Kalman filtering to realize the dynamic compensation of the gas concentration measurement value. And the accuracy of the corrected gas concentration estimated value is improved.

The invention relates to a shear-based acceleration and pressure composite sensor and an assembly method thereof, and belongs to the field of composite sensors. According to the technical scheme of the acceleration and pressure composite sensor based on the shear type structure, an acceleration detection module comprises a mass block of a regular polygon prism structure, and each side face of the mass block is provided with an acceleration sensitive ceramic piece; the pressure detection module comprises a force transmission column of a regular polygon prism structure, and each side face of the force transmission column is provided with a pressure sensitive ceramic piece, an electrode piece and an insulation block. According to the scheme, the sensitive elements of the acceleration sensor and the pressure sensor core are arranged in a polygonal mode to form a spatial three-dimensional structure, the effective area of the sensitive elements in unit volume is increased, the multiple sensitive elements act together to form superposition of pressure signals, the detection precision and sensitivity of the two are guaranteed, and the detection precision is improved. Therefore, the overall size of the composite sensor is greatly reduced on the premise that the original precision is maintained, and the composite sensor is miniaturized.

The invention discloses a sensor array acquisition system for detecting gas, and relates to the field of gas sensors. The sensor array acquisition system for detecting gas comprises a gas sensor array, a signal conditioning circuit, an analog-to-digital conversion module, a control module and a power supply module. According to the sensor array acquisition system for detecting the gas, the voltage follower circuit with high input impedance is adopted, so that the problem of attenuation during signal acquisition of a high-impedance sensor is effectively solved, and the signal acquisition precision is improved. Through the adjustable direct-current bias circuit and the differential amplification circuit, the dynamic adjustment of the measurement range is realized, the gas detection requirements of different concentration ranges can be met, and hardware does not need to be replaced. A constant-current driving chip is adopted to control a sensor heating circuit, heating current can be accurately set by adjusting external resistance, it is ensured that the sensor works at the optimal temperature, and the stability and response speed of the sensor are improved.

The invention discloses a centripetal force sensor and a using method thereof, and belongs to the field of sensors. According to the technical scheme, the centripetal force sensor comprises a fixed part and a rotating part, the rotating part comprises a sensor shell, the sensor shell is hollow, a center signal column is fixedly installed in an inner cavity of the sensor shell, a plurality of notches are formed in the outer circumferential face of the center signal column, and mass blocks are placed in the notches; piezoelectric ceramics are arranged on the outer side of the mass block, and the piezoelectric ceramics and the mass block are clamped between the inner wall of the sensor shell and the outer wall of the center signal column. The sensor is directly installed at the rotation center of a detected object, additional centrifugal force generated by the mass of the sensor approaches to zero, the authenticity of the detection result is greatly improved, meanwhile, the sensor is in direct conductive contact with the signal output structure through the center signal column, the mouthpiece does not rotate along with the detected object, and the detection accuracy is improved. The winding and pulling faults of the mouthpiece and an external pipeline are completely eradicated, and the durability of the sensor is improved.

The invention discloses a gait sensing unit of a triboelectric nano generator based on liquid metal / PDMS porous sponge, and relates to the field of gait sensors, and the sensing unit with high porosity, flexibility and durability is prepared through a template method. A white granulated sugar template is adopted to construct a three-dimensional communicated porous structure, so that uniform dispersion of LM in a PDMS matrix is realized, and the technical problem that low density and high sensitivity of traditional TENG are difficult to consider at the same time is solved. The preparation method comprises the steps of mixing and stirring, template infiltration, curing molding, template dissolution and the like, flexible sensors with thousand secondary cycle stability can be produced in batches, and the flexible sensor is suitable for wearable health monitoring equipment.

The invention relates to a flattened three-dimensional acceleration and three-dimensional force composite sensor and a detection method thereof, and belongs to the field of sensors. According to the technical scheme, the flattened three-dimensional acceleration and three-dimensional force composite sensor comprises a force sensor module and an acceleration sensor module, the force sensor module comprises four shear effect force detection elements and four longitudinal effect force detection elements, and the four shear effect force detection elements and the four longitudinal effect force detection elements are coplanar. The acceleration sensor module comprises four shear effect acceleration detection elements and four longitudinal effect acceleration detection elements, and the four shear effect acceleration detection elements and the four longitudinal effect acceleration detection elements are coplanar. According to the scheme, the sensitive elements with the longitudinal effect and the shear effect are combined, three-dimensional detection is achieved through the thickness of the single-layer sensitive element, flattening of the sensor is achieved through single-layer arrangement of the sensitive elements, thermal expansion and stress are greatly reduced in the installation direction, and the detection precision is guaranteed.

The invention discloses an intelligent sensing data processing method based on an electronic water gauge, which belongs to the field of water level sensors and comprises the following steps: acquiring visible light images, infrared thermal imaging, ultrasonic ranging and pressure type water level values to form multi-source data; constructing a Kalman filter and defining a water level state vector based on the obtained multi-source data, dynamically adjusting a weight factor and a noise covariance matrix according to the real-time confidence of each sensor, and outputting a preliminary water level estimated value and a corresponding confidence index after fusion calculation; fusing the obtained multi-source data into four-channel input data, inputting the four-channel input data into a pre-trained U-Net model for semantic segmentation, generating a water surface shelter segmentation mask, identifying the type of a shelter based on the mask, and calculating a shelter area proportion; and extracting a water line edge point set of an unshielded region from the original image by using the generated shielding object segmentation mask, reconstructing a continuous water line through linear fitting, and performing interpolation filling on the shielded region.

The invention relates to the field of flexible electronic sensors, in particular to a high-range and high-sensitivity three-electrode ionization pressure sensor and a preparation method thereof. The three-electrode ionization pressure sensor comprises a flexible packaging shell, three layers of flexible electrodes packaged in the flexible packaging shell, two sensitive layers with microstructures and arranged between the flexible electrodes, and spacing layers arranged between the flexible electrodes and the sensitive layers with the microstructures, the flexible electrodes and the sensitive layers with the microstructures are arranged in a crossed and stacked manner, and the two sensitive layers with the microstructures are provided with sensitive layer microstructures with different scales. The linear sensing range is enhanced by arranging the two sensitive layers with the microstructures of different scales, and the effect of widening the linear range of the sensor can be achieved; the sensor has excellent performance and has extremely high application potential in motor monitoring and motor intelligent interaction.

The invention discloses an all-digital PVT sensor based on a ring oscillator, and relates to the field of PVT sensors, the all-digital PVT sensor comprises a process sensing circuit, a voltage sensing circuit and a temperature sensing circuit, the process sensing circuit comprises a process detection ring oscillator, the voltage sensing circuit comprises a voltage detection ring oscillator, and the temperature sensing circuit comprises a temperature detection ring oscillator. The temperature sensing circuit comprises a temperature sensitive ring oscillator; under the control of an enable signal, the process detection ring oscillator, the voltage detection ring oscillator and the temperature-sensitive ring oscillator start oscillation, and the process corner, the temperature and the power supply voltage of the detected chip are determined based on the oscillation frequencies of the process detection ring oscillator, the voltage detection ring oscillator and the temperature-sensitive ring oscillator. The PVT sensor is completely realized based on a digital circuit, an additional analog module does not need to be introduced, the area overhead is greatly reduced, and the PVT sensor has remarkable area advantage and structural simplicity while the high-precision detection capability is maintained.

The invention discloses a self-powered flexible sensor and a preparation method thereof, and belongs to the field of electronic skin, man-machine interaction, flexible electronic devices and sensors. The invention relates to a cellulose acetate-based ionic gel self-energized flexible sensor which is prepared from cellulose acetate, ionic liquid, a polymer monomer, a cross-linking agent and an initiator and has good mechanical property and antibacterial property, the cellulose acetate enhances the mechanical property of the gel through non-covalent crosslinking, and the ionic liquid plays a conductive role. The flexible sensor has good conductivity, high sensitivity and stability, and can be stretched, twisted and bent. Meanwhile, the high transparency and excellent biocompatibility can be realized, so that the electronic skin can be used as the electronic skin for multifunctional perception and integrated application. The material is environment-friendly, the preparation method is simple, the operability is high, the application field is wide, and the prospect is wide.

The application is a kind of force and three-dimensional acceleration composite sensor and its using method, belongs to composite sensor field. Its technical scheme is, a kind of force and three-dimensional acceleration composite sensor, including force detection component and three-dimensional acceleration detection component, force detection component includes annular force core body electrode column, and lower quartz ring and upper quartz ring are respectively arranged on its upper and lower ends, impact platform is arranged above the upper quartz ring, and the lower quartz ring is attached to the base;Three-dimensional acceleration detection component is located inside annular force core body electrode column, including center integrated column, and four horizontal vibration arms and multiple vertical vibration arms are arranged on the outer periphery of the center integrated column, and acceleration detection unit is arranged on the end of each vibration arm away from the center integrated column. The sensor integrates force and three-dimensional acceleration measurement function, can synchronously collect two kinds of signals, the annular structure and the internal setting improve the protection to acceleration detection component, the cantilever structure converts impact force into vibration, reduces the impact suffered by detection unit, and is suitable for instantaneous high impact force working condition.

This invention relates to a force and three-dimensional acceleration composite sensor and its application method, belonging to the field of composite sensors. The technical solution is as follows: a force and three-dimensional acceleration composite sensor includes a force detection component and a three-dimensional acceleration detection component. The force detection component includes a ring-shaped force core electrode post with a lower quartz ring and an upper quartz ring at its upper and lower ends, respectively. An impact platform is located above the upper quartz ring, and the lower quartz ring is attached to a base. The three-dimensional acceleration detection component is located inside the ring-shaped force core electrode post and includes a central integrated post. Four horizontal vibrating arms and multiple vertical vibrating arms are arranged around the central integrated post. An acceleration detection unit is located at the end of each vibrating arm furthest from the central integrated post. This sensor integrates force and three-dimensional acceleration measurement functions, and can simultaneously acquire two types of signals. The ring structure and internal design enhance the protection of the acceleration detection component, and the cantilever structure converts impact force into vibration, reducing the impact on the detection unit, making it suitable for instantaneous high-impact conditions.

The utility model discloses an automobile front and rear wheel sensor performance test bench, which relates to the field of sensors and comprises a workbench, fixing rods are mounted at the front end and the rear end of the workbench, inclined blocks are mounted at the upper ends of the fixing rods, a bearing table is mounted at the upper end of the workbench, and a baffle plate is mounted on the inner wall of the bearing table. A sensor is installed in the bearing table, a sensing connecting line is installed at one end of the sensor, and an integrated frame is installed above one end of the sensing connecting line. Through the arrangement of the workbench, the bearing table, the sensor, the sensing connecting line, the integrated frame and the terminal display, after a tire of a vehicle stops on the bearing table, data statistics is carried out through the sensor installed on the surface of the bearing table, and data statistics and transmission are carried out through the integrated frame through the sensing connecting line; and the performance of the tire sensor is detected through the installed terminal display.

The application belongs to the field of sensors, and discloses a sensor driving loading method, device, chip, product and medium, from multiple candidate sensor drivers, a candidate sensor driver is selected as a current to-be-matched driver, and a program segment corresponding to the current to-be-matched driver is copied from DDR to IRAM; the target sensor is hardware initialized and the hardware ID of the target sensor is obtained; the hardware ID is compared with the to-be-matched ID in the program segment; if the same, the structure pointer of the current to-be-matched driver is returned; if not the same, it is judged whether there is still other candidate sensor driver; if yes, the step of selecting a candidate sensor driver from multiple candidate sensor drivers as a current to-be-matched driver is returned; if not, the sensor failure loading information is returned. Various types of sensors can be adapted by using a set of software systems, and the utilization rate of IRAM is higher.

The invention relates to the field of MEMS sensors, and discloses an MEMS sensor air pressure drift pre-calibration method based on an outdoor cold environment, and the method comprises the following steps: S1, low air pressure environment construction and natural recovery, and S2, dynamic data synchronous acquisition. Pollution of vibration of the low-pressure box to calibration data of the sensor is fundamentally eliminated, the purity of the calibration data is ensured, the air pressure drift correction coefficient obtained through fitting truly reflects the physical relation between air pressure and sensor output, and the authenticity and accuracy of the calibration coefficient are remarkably improved. Aiming at the problem that the calibration process in the prior art is not natural, the air pressure natural recovery process is closer to the air pressure change scene experienced by the sensor during actual outdoor application, so that the generalization ability and the compensation effect of the calibrated air pressure coefficient in the actual environment are better, and the applicability problems that the precision required by a laboratory is high and the field error is large are effectively solved.

The utility model discloses a kind of oil well load and displacement wireless integration sensor, belong to load sensor field, including suspender and load sensor body, the top of the suspender is fixedly connected with two mounting plates, the both sides of load sensor body outside are fixedly connected with slide bar, two slide bars are respectively in the middle portion of two mounting plates and are slidably connected, in the scheme, load sensor body is positioned quickly by the sliding cooperation of slide bar and mounting plate, and rotation handle can complete limit fixing, when disassembling, limit block is separated from limit hole by pulling handle, and it can be removed, without complex tool and professional skill, substantially shorten installation and replacement time, reduce field operation intensity, in addition, the clamping of safety block and handle forms double insurance, even if one spring fails, still can prevent sensor body accidental drop;Steel wire rope and hanging block evenly disperse load, play auxiliary load-bearing role when suspender is under abnormal stress, reduce equipment damage and safety accident risk.

A grille guard system, comprising a grille guard, a first latch, and a second latch. The first latch comprising a handle, a cam assembly, a backplate comprising a U-bolt, and a first latch housing. The second latch comprising a handle, a cam assembly, a backplate comprising a U-bolt, and a second latch housing. A lift assist system in operational communication with the grille guard assembly. A sensor cap comprising an angled opening configured to be placed over a vehicle sensor and constrain the sensor field of view.

This invention relates to the field of MEMS sensors and discloses a method and system for correcting single-axis abrupt changes in MEMS sensors, including the following steps: S1, obtaining the local gravitational acceleration reference value g at the deployment location of the target MEMS sensor; In this invention, through a dual judgment mechanism of modulus deviation and inter-axis correlation coefficient, it is possible to accurately distinguish between interference abrupt changes and real motion. Modulus deviation is used to initially screen abnormal data, while inter-axis correlation coefficient further verifies the authenticity of the abrupt change, effectively avoiding the problem of incorrect correction caused by relying on only a single indicator in the prior art. Furthermore, based on the physical law of conservation of the three-axis acceleration vector sum under static measurement, the abrupt axis is corrected using stable data of the other two axes, and an inter-axis coupling correction factor is introduced to compensate for manufacturing process deviations. The corrected data has high accuracy, and the total modulus deviation can be stably controlled within a preset threshold range, significantly improving the data accuracy of MEMS sensors in outdoor static measurement scenarios.

This invention relates to the field of sensors and discloses a sensor drift correction method and system based on transfer learning, comprising the following steps: S1, collecting sensor data, including triaxial acceleration data, temperature, humidity, and air pressure environmental parameters; S2, calculating the magnitude of the triaxial composite vector. In this invention, a zero-point mapping model is constructed by using Gaussian process regression. The combined kernel function of periodic kernel, linear kernel, and RBF kernel can simultaneously capture the periodic fluctuations of environmental factors, the long-term trend of sensor aging, and short-term random noise. The maximum mean difference loss function is used to achieve adaptive distribution alignment between the source domain and the target domain, enabling the model to quickly adapt to the target domain. At the same time, a slope intercept joint judgment matrix is ​​introduced to achieve accurate differentiation between zero-point drift and real motion and tilt events, with an accuracy of over 96%. This effectively avoids measurement distortion caused by miscompensation and significantly improves the reliability and data credibility of the system.

The invention relates to the field of MEMS sensors, and discloses an MEMS sensor single-axis abrupt change correction method and system, and the method comprises the following steps: S1, obtaining a local gravitational acceleration reference value g of a target MEMS sensor deployment position; according to the method, the interference sudden change and the real motion can be accurately distinguished through a dual judgment mechanism of the die length deviation and the inter-axis correlation coefficient, the die length deviation is used for preliminarily screening abnormal data, the inter-axis correlation coefficient further verifies the authenticity of the sudden change, the problem of error correction caused by dependence on a single index in the prior art is effectively avoided, and the accuracy of the error correction is improved. And based on the physical law of three-axis acceleration vector and conservation under static measurement, the abrupt change axis is corrected by utilizing stable data of other two axes, and an inter-axis coupling correction factor is introduced to compensate the manufacturing process deviation, so that the corrected data is high in precision, and the total mold length deviation can be stably controlled within a preset threshold range. And the data accuracy of the MEMS sensor in an outdoor static measurement scene is obviously improved.

The utility model relates to a digital illuminance and ultraviolet ray integrated sensor applied to the sensor field, comprising a sensor lower cover, the upper end of the sensor lower cover is fixedly connected with a communication interface and a plurality of studs, and the upper ends of the plurality of studs are jointly inserted with a sensor mainboard. The upper end of the sensor mainboard is fixedly connected with an illumination photoelectric detector and an ultraviolet photoelectric detector, the illumination photoelectric detector is located on the left side of the ultraviolet photoelectric detector, and the upper end of the illumination photoelectric detector is fixedly connected with an illumination correction light filter. Compared with the independent illumination, the device provided by the utility model better meets the standard requirements, and after the illumination and the ultraviolet are detected, the manual calculation of workers is not needed, and the illumination measurement value, the ultraviolet measurement value and the relative content of the ultraviolet radiation are directly output through calculation, so that the workload of the workers is effectively reduced, the practicability of the device is improved, and the device is more convenient to use.

The utility model discloses a multi-interface sensor for data acquisition, which belongs to the field of data acquisition sensors and is characterized in that the upper end of a sensor packaging shell is provided with a mounting cavity, the side wall of the mounting cavity is provided with an arc-shaped through groove, a first arc-shaped shell and a second arc-shaped shell are mounted at the arc-shaped through groove, and the first arc-shaped shell and the second arc-shaped shell are connected through a butt joint part; and an interface sealing cover is mounted in an opening in the end surface of the first arc-shaped shell. And the arc-shaped shell is connected through a butt joint design and a bolt, so that the stability and the sealing of the structure are realized. This enhances the stability of the sensor, prevents external impurities from invading, and protects internal electronic components. The compatibility and the application range of the sensor are improved through the design of the multi-interface assembly, the sealing performance of the connecting part is enhanced through the sealing ring, and normal work in a severe environment is ensured. The design of the interface sealing cover protects the internal interface, the sealing performance and stability of the connection part are ensured through threaded connection and the sealing ring, the reliability of the sensor is improved, and the service life of the sensor is prolonged.

This invention discloses a sensor network deployment and self-startup method for monitoring the long-term service performance of highway subgrade and pavement. The method comprises the following steps: S1: analyzing the types and locations of defects based on historical highway inspection data to construct a subgrade and pavement condition assessment model; constructing a probability model for the highway monitoring sensor network based on the parameters of different sensor types; S2: optimizing network-level monitoring plan decisions; S3: combining the subgrade and pavement condition assessment model with the gridded sensor field location and granularity under different operating conditions, deducing monitoring probability thresholds, and establishing a genetic algorithm training data set; S4: optimizing the deployment of the highway monitoring sensor network using a multi-objective optimization genetic algorithm; S5: controlling the self-awakening of the highway monitoring sensors based on a game theory model; and S6: establishing a long-term highway service performance risk warning mechanism based on the traffic environment and monitoring data. This method can provide real-time early warning of long-term highway service performance risks.

The utility model relates to the field of tire pressure sensors, in particular to a TPMS (Tire Pressure Monitor System) receiver circuit with double controllers, which comprises a power supply module, a receiving module, an auxiliary controller module, a main controller module and a CAN (Controller Area Network) communication module, the power supply module is electrically connected with an external power supply, and the power output end of the power supply module is electrically connected with the power input ends of the receiving module, the auxiliary controller module, the main controller module and the CAN communication module; the signal input end of the receiving module is connected with an antenna ANT, and the signal output end of the receiving module is electrically connected with the signal input end of the auxiliary controller module; the signal output end of the auxiliary controller module is electrically connected with the main controller module, the communication end of the main controller module is electrically connected with the CAN communication module, the auxiliary controller only receives and stores data by means of division and cooperation of the two controllers, the main controller is only responsible for data reading and communication, mutual interference is avoided, and the CAN communication module is electrically connected with the CAN communication module. And the phenomena of RF data frame missing, data loss, CAN communication abnormity and the like are effectively prevented.

The utility model relates to a laser sensor capable of active detection, which is applied to the field of sensors and comprises an equipment body, a vertical rod is arranged in the equipment body, the upper end of the vertical rod is fixedly connected with a transverse bearing operation plate, and transverse sliding grooves are symmetrically formed in the left side and the right side of the upper end of the transverse bearing operation plate. The ends, away from each other, of the two transverse sliding grooves are fixedly connected with elastic reset pieces, the inner ends of the transverse sliding grooves are slidably connected with U-shaped adjustable abutting blocks, and telescopic self-rebounding storage vertical rods are arranged at the upper ends of the U-shaped adjustable abutting blocks. The upper ends of the two telescopic self-rebounding storage vertical rods are fixedly connected with a laser emitting sensor and a laser receiving sensor respectively, in the laser sensor capable of active detection, when different working conditions are met in the scheme, the adjustment range is further expanded through linkage adjustment in the vertical direction and the horizontal direction in the equipment body, and the adjustment precision is improved. A bidirectional adjustment mechanism enables the sensor to adapt to a complex and changeable space detection scene.

The invention relates to the field of sensors, and discloses a multidirectional force sensor which comprises a connecting assembly and a measuring assembly, the connecting assembly comprises a first connecting body and a second connecting body, the measuring assembly comprises a measuring sleeve, a measuring shaft mechanism and a strain gauge, and the measuring shaft mechanism comprises an elastic connecting rod, a first elastic piece and a second elastic piece. When the measured structure is subjected to linear force, the first elastic piece and the second elastic piece of the measuring shaft mechanism deform, the elastic connecting rod slides relative to the first connecting body and the second connecting body, meanwhile, the elastic connecting rod drives the measuring sleeve to slide, and deformation quantity is detected through the signal transmission element and an electric signal is output. The first adjusting piece and the second adjusting piece can be used for independently adjusting the measuring ranges of the drawing force and the compressing force, and the adaptability of the sensor is improved. When the measured structure is subjected to a rotating force, the rotating force can be detected through the deformation of the strain gauges connected with the first connector, and the temperature drift is corrected through the signal proportion of the two sets of strain gauges, so that the measurement precision is improved.

The application relates to a time-domain temperature sensor based on MOSFET temperature sensing, and belongs to the temperature sensor field. The temperature sensor comprises a temperature sensing unit and a frequency digital converter connected in sequence. The frequency digital converter comprises a voltage-controlled oscillator and a counter. The temperature sensor senses the external temperature through the temperature sensing unit, converts a physical signal into an analog signal, converts the analog signal into a frequency signal through the voltage-controlled oscillator, inputs the frequency signal into the counter, and reads out a digital code value representing temperature information from the counter. Compared with a traditional temperature sensor, the temperature sensor has the advantages of low power consumption, small area, simple structure and the like.

The application discloses a kind of based on mechanism and data driven's sugarcane squeezing process process index prediction method, comprising the following steps: (1) multi-sensor field data acquisition and preprocessing, establish original data set;(2) establish sugarcane material elastic-plastic constitutive model;(3) establish sugarcane squeezing process porous medium control equation;(4) sugarcane squeezing process fluid-solid coupling model and its simulation, and establish new data set;(5) the establishment of physical guide neural network model;(6) the training details of physical guide neural network, obtain based on mechanism and data driven's sugarcane squeezing process process index prediction model.The method of the application is mainly used to predict the key process indexes such as sugarcane juice precipitation amount and sugarcane juice precipitation speed in the sugarcane squeezing production process.The cost of data acquisition in the production process is greatly reduced.High-dimensional system is characterized by small data set;The consistency of network can be greatly improved, and the generalization ability is enhanced.

The utility model relates to the field of optical fiber interference sensors, and discloses an M-Z interference sensor of a seven-core optical fiber cascaded graded-index multimode optical fiber, which comprises a light injection single-mode optical fiber, a step multimode optical fiber, a seven-core optical fiber, a graded-index multimode optical fiber and a light receiving single-mode optical fiber which are connected in sequence, the axis of the joint of the seven-core optical fiber and the gradient refractive index multimode optical fiber deviates by a preset offset; the outer side of a fiber core of the seven-core optical fiber is coated with a stress layer, and the radius of the fiber core of the step multimode optical fiber is larger than the radius of the stress layer of a central fiber core of the seven-core optical fiber and smaller than the minimum distance from the central fiber core of the seven-core optical fiber to the stress layer of the fiber core on the outer side of the seven-core optical fiber. The length of the seven-core optical fiber is far smaller than that of the gradient multimode optical fiber; and the refractive index of the stress layer material outside the fiber core of the seven-core optical fiber is smaller than that of the cladding material of the seven-core optical fiber. According to the scheme, the problems that the interference valley is too wide and the extinction ratio is too low in a gradient refractive index multimode optical fiber interference sensor can be solved while the high-sensitivity sensing characteristic is maintained.