102results about How to "Reliable measurement" patented technology

The invention discloses a steel wire rope diameter measurement method and system based on machine vision, a medium and a terminal, and the method comprises the following steps: collecting an image of a steel wire rope through an area-array camera, and carrying out the preprocessing of the collected image; automatically adjusting a threshold value according to image characteristics, performing adaptive binarization processing on the preprocessed image, and extracting an effective area of the steel wire rope; extracting the edge information of the steel wire rope in the image of the effective area by adopting a Canny operator, and detecting the central axis of the steel wire rope in the image by using Hough transformation; the edge information and the central axis position serve as new image feature vectors to be input into a trained support vector machine SVM model, and a decision function is used for calculating a predicted diameter value; according to the method, the threshold value is automatically adjusted according to the image characteristics through self-adaptive binaryzation, the accuracy of edge detection is improved, the measurement of the diameter of the steel wire rope is optimized through the SVM algorithm, and the precision, efficiency and repeatability of measurement and the generalization ability of the model are improved.

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 belongs to the technical field of airborne atmospheric detector equipment, and particularly relates to an airborne cloud water content detection system, which comprises a constant-temperature hot wire sensor, a cloud water content detection module, a cloud water content detection module and a cloud water content detection module, the pressure sensor is used for measuring atmospheric pressure; the temperature sensor is used for measuring the temperature in the cloud; the humidity sensor is used for measuring the humidity in the cloud; the data processing module is used for receiving the data of the sensor and processing and analyzing the data through a specific algorithm to determine the cloud water content; the data communication module is used for outputting the measured data and the calculated cloud water content data to a computer or other acquisition detector equipment through the Ethernet or a serial port; and the heating control module is used for keeping the detector in a preset standard working temperature range so as to ensure the measurement accuracy and the reliability of detector equipment, and has the effect of finely detecting the airborne cloud water content.

The invention relates to the technical field of electric propulsion ground testing, in particular to an electric propulsion ground mechanical property evaluation device which comprises an optical vibration isolation platform, a stepping motor, an adjustable bottom plate, a fixed support, a coil, a movable frame, an electric thruster, a steel ball, a permanent magnet and a control box. The screw rod is connected with the lower surface of the front end of the adjustable bottom plate; the steel ball is in contact with the lower surface of the rear end of the adjustable bottom plate; the movable frame is arranged above the adjustable bottom plate through an elastic rod; the permanent magnet is arranged on the front end side of the movable frame; one end of the fixed bracket is fixed on the upper surface of the front end of the adjustable bottom plate, and the other end is movably connected with the permanent magnet; the coil is wound on the fixed bracket; the electric thruster is arranged at the rear end of the movable frame; and the control box is arranged between the adjustable bottom plate and the movable frame. According to the application, the measurement of the thrust of the electric thruster is more reliable, the elastic piece can be protected, and the influence of environment temperature and stress on the measurement result is reduced.

The invention discloses a high-precision absolute position magnetic encoder measuring system, and relates to the technical field of encoders, the absolute position magnetic encoder measuring system comprises a magnetic sensor, an encoding disc and a coil power supply; the coding disc comprises two code channels; the two code channels are coaxial and are formed by continuously winding periodic inductance coils into a ring shape; and the coil power supply is a circuit or an element capable of providing a constant power supply. According to the invention, common inductance coil and multi-antipode magnetic ring coding modes are considered, the realization mode is simple and accurate, signals are easy to process, and the anti-interference performance of multi-induction point differential signals is stronger.

The invention belongs to the technical field of mechanical assembly, and particularly relates to a device and method for detecting rotation flexibility of an inner ring and an outer ring of a knuckle bearing under the action of torque, and the device comprises a base, one side of the base is fixedly connected with a support, the support is provided with a step main shaft, one end of the step main shaft is provided with a rotation unit, and the other end is sleeved with the inner ring of the knuckle bearing. The fixing unit is matched with the first step face so that the knuckle bearing inner ring can rotate along with the step main shaft, a wheel is further rotationally arranged on the step main shaft and between the knuckle bearing inner ring and the support, a directional shaft is arranged on the wheel, and a balance weight unit connected with the wheel is arranged on the base. The inner ring and the outer circle of the knuckle bearing are ingeniously integrated with elements in the detection device through the directional shaft and the fixing unit, and when the rotating unit drives the inner ring of the knuckle bearing to rotate by one circle, whether the counterweight unit leaves the base or not is observed to judge the rotation flexibility. The torque is determined by the wheels and the counterweight unit. The device is ingenious and simple in structure, convenient and easy to manufacture and detect and low in cost.

The invention discloses a construction site distribution current wide-range measurement circuit and a measurement method thereof. The circuit comprises a current-to-voltage circuit (1), a voltage amplification circuit (2) and a current range control module (3). A first resistance switching module (5) is arranged in the current-to-voltage circuit (1), and the first resistance switching module (5) adjusts multiple conversion between an input current and an output voltage by switching resistance values; the voltage amplification circuit (2) is provided with a second resistance switching module (6), and the second resistance switching module (6) adjusts the amplification factor of the output voltage by switching resistance values; according to the invention, the current signal is amplified according to the required proportion through the multiple-adjustable current-to-voltage circuit and the voltage amplification circuit, so that the accurate measurement of the current is realized.

This invention discloses an internal bore measuring machine, including a base, a seat, and a top steel plate covering the seat; a transition roller track, including a roller assembly and a gantry frame; a positioning device, including a frame, a top plate, a lifting cylinder; a rear inspection mechanism, including a fixed frame, a transverse movement mechanism and a transverse linear slide rail mounted on the fixed frame, a reciprocating measuring mechanism mounted on the transverse movement mechanism; a control cabinet with a built-in PLC as the main controller; a cantilever operation box assembly is provided on one side of the control cabinet, the cantilever operation box assembly including a cantilever, an operation box, and an enclosure assembly consisting of a front enclosure and two side enclosures respectively placed on both sides of the front enclosure, with a U-shaped cross-section, placed on the base and with the U-shaped opening fastened to the control cabinet, enclosing the positioning device and the gantry frame. This invention solves the problems of poor coordination of existing automatic detection and conveying, low efficiency of step-by-step detection, and insufficient rigidity.

A sensor element for detecting angular velocity about a detection axis perpendicular to a plane of the sensor element is disclosed. The essentially planar sensor element comprises two primary masses and two Coriolis masses, and two sensing cells. The sensor element further comprises two coupling levers each coupled to the two primary masses by first springs and to one of the two Coriolis masses by second springs, the coupling levers enabling the two primary masses and the two Coriolis masses to be excited into a combined primary motion occurring in the plane of the essentially planar sensor element. In the combined primary motion, the direction of the angular momenta of linear primary oscillation motions of the primary masses and angular momenta of rotational primary motions of the coupling levers with respect to the geometrical centroid of the sensor element is opposite to the direction of the angular momenta of linear primary oscillation motions of the Coriolis masses with respect to the geometrical centroid of the sensor element.

The invention provides an inspection device which can reliably measure a special-shaped part such as an inclined surface of a wafer in a space-saving manner. An inspection apparatus (100) includes an outer peripheral illumination unit (11, 111) that illuminates an outer peripheral region (AP) of a target wafer (WA), and an outer peripheral image capturing unit that captures an image of the outer peripheral region (AP) of the wafer (WA), the outer peripheral illumination unit (11, 111) having an arc illumination unit (11a, 111a) that is disposed along a partial region of a circumference (CI) and that illuminates a predetermined region (A1) on a reference axis (SA), and the arc illumination unit (11a, 111a) being disposed along a partial region of the circumference (CI) and that illuminates the predetermined region (A1) on the reference axis (SA). The circumference (CI) is centered on a reference axis (SA), and the reference axis (SA) of the arc illumination portions (11a, 111a) extends in a direction intersecting a tangential direction in which the outer peripheral portion (UA) of the wafer (WA) extends.

The invention relates to a method for determining the wear state of a roller of a curve control unit for a container treatment machine, said curve control unit comprising a control curve, at least one roller which is movably guided along the control curve, and a measuring element which is guided together with the roller along the control curve, said control curve comprising a sensor device, wherein the roller is guided through the sensor device when running along the control curve, and a distance value between the measuring element and the sensor device is determined by means of the sensor device when the roller is guided through, and wherein a wear state of the roller is determined on the basis of the distance value.

The application discloses a water depth detection method, device, equipment and medium. The method comprises the following steps: acquiring a transmission position of an active source and a receiving position of a passive source; determining a middle point between the active source and the passive source according to the transmission position and the receiving position, and taking the middle point as a water depth point to be detected; acquiring an excitation time of multiple seismic waves excited by the active source and a first arrival time of each seismic wave received by the passive source; and calculating a seawater depth of the water depth point to be detected according to the transmission position, the receiving position, the excitation time of each seismic wave and the first arrival time. The embodiment of the application can improve the accuracy and efficiency of detecting the seawater depth.

The invention relates to the technical field of oil exploitation equipment, in particular to an implementation method for constructing an electrical indicator diagram based on electrical parameter data of a pumping unit. The technical problems are as follows: an actual measurement indicator diagram device in the prior art is under the action of periodic alternating load for a long time and is easy to break down; according to the technical scheme, the implementation method for constructing the electrical indicator diagram based on the electrical parameter data of the oil pumping unit comprises the steps that collected power and angular displacement data are substituted into a fitted torque curve formula for calculation, and an indicator diagram is obtained; compared with an actual measurement indicator diagram device in the prior art, which is under the action of periodic alternating load for a long time and is easy to generate faults, the suspension point indicator diagram is indirectly calculated by measuring the electrical parameters of the pumping unit motor and walking beam rotation angle data acquired by the attitude instrument, direct use of the actual measurement device is avoided, and the cost is reduced. Therefore, the efficiency and the accuracy of obtaining the indicator diagram are obviously improved; as the measurement of the electrical parameters and the rotation angle data is relatively stable and reliable, the repeatability of the indicator diagram is also improved.

This invention relates to an air mass flow sensor for determining air mass flow rate, the air mass flow sensor having a housing (4) and sensor electronics (6), wherein the sensor electronics are at least partially disposed in a housing chamber (8) of the housing (4), wherein the housing (4) has a flow channel (14) for guiding an air mass flow (L) to be measured through the housing (4), the flow channel (14) having a measuring channel (20) and a bypass channel (22), wherein the measuring channel (20) guides a portion of the air mass flow (L) flowing into the flow channel (14) to a measuring point (24) of the sensor electronics (6), and wherein the bypass channel (22) guides a portion of the air mass flow (L) flowing into the flow channel (14) to a measuring point (24) of the sensor electronics (6) upon reaching the measuring point (24). 24) The first wall element (28) that branches out from the housing (4) at least segmentally separates the bypass channel (22) and the measuring channel (2) from each other has a wall height (H1) that is at least segmentally reduced, such that the first wall element (28) can be overflowed at least segmentally, and / or the first wall element (28) has a through hole (34) that allows flow through the first wall element (28), and the second wall element (33) that branches out from the bypass channel (22) and the inlet (16) of the flow channel (14) at least segmentally separates from each other has a wall height (H3) that is at least segmentally reduced, such that the second wall element (28) can be overflowed at least segmentally, and / or the second wall element (28) has a through hole (34) that allows flow through the second wall element (28).

The utility model discloses a transformer sound level measurement auxiliary device, which comprises a plurality of sound level probes used for acquiring sound signals of a transformer, and further comprises a probe bearing frame covering the periphery of the transformer, and the plurality of sound level probes are arranged along the circumferential direction of the probe bearing frame. The sound level probes are located on the same horizontal plane, and the distances from the sound level probes to the outer surface of the transformer are equal. According to the utility model, the problem of inconsistent measurement distances caused by positioning deviation in traditional manual measurement is effectively solved, and the accuracy and reliability of measurement data are ensured; secondly, the sound level meter does not need to be held manually or the position of the measuring head does not need to be adjusted frequently, the electric shock safety risk possibly faced by manual operation under the electrified working condition is greatly reduced, and the personal safety of operators is guaranteed; and multiple measuring points can be measured at the same time, so that the condition of long time consumption of a single test caused by manual switching measurement of multiple measuring points in the prior art is changed, and the detection efficiency is greatly improved.

The invention belongs to the field of plasma electron density measurement, and discloses a plasma electron density measurement device and method based on optical fiber dispersion interference. A part of an incident laser beam is subjected to frequency multiplication by the first optical fiber dispersion interference assembly, detection light becomes superposed light of a fundamental wave and an original second harmonic wave and penetrates through plasma, and the two waves both meet a characteristic phase shift; in order to obtain an interference light beam, the transmitted fundamental wave is multiplied by the second optical fiber dispersion interference assembly again, and the original second harmonic is kept unchanged; optical signals of two mutually interfered second harmonics are converted into electric signals through a balanced photoelectric detector, differential amplification is carried out on the electric signals, and finally the plasma electron density is obtained according to the electric signal differential amplification result; the influence of disturbance on the two partial waves is the same, so that the device has good stability in measuring the low-density plasma, and mutual compensation can be realized; and the measurement efficiency and effect are ensured.

This invention discloses a scalable distributed multi-chamber open-path photosynthetic measurement system and method, relating to the field of plant physiological and ecological measurement technology. The system includes a main unit and at least two distributed chambers. The main unit centrally manages gas supply, concentration mixing, flow control, and high-precision concentration differential analysis. Each chamber is an independent unit, equipped with an adjustable LED light source, thermoelectric temperature control module, multiple types of sensors, independent power supply, and wireless communication module. An open path is formed through the gas supply pipeline and the return pipeline. The core of the method lies in the main unit polling and sampling the return gas from each chamber according to a preset program through a multi-channel automatic switching valve group. Combined with a "flushing stabilization" strategy, a single gas analysis unit is used to achieve high-precision, high-throughput parallel measurement of multiple chambers. This invention solves the problems of low throughput and high cost of traditional open-path instruments, achieving a balance between high precision and high throughput, and supports in-situ deployment in the field and remote monitoring.

The invention relates to the technical field of detection and calibration, and provides a BRDF reflection space distribution calibration value measurement method, system and device, a medium and a program product, and the method comprises the steps: respectively obtaining the signal current ratios of a to-be-measured sample and a standard diffuse reflection plate under various characteristic conditions; determining a relative calibration value of the to-be-measured sample under each characteristic condition based on the signal current ratio and the calibrated magnitude of the standard diffuse reflection plate on the absolute calibration device under each characteristic condition; based on any calibration value under any characteristic condition in the relative calibration values, performing normalization processing on each relative calibration value to obtain a normalized measurement value; determining an absolute calibration value of the to-be-tested sample under any characteristic condition based on the magnitude of the standard diffuse reflection plate under any characteristic condition; and determining the BRDF calibration value of the to-be-measured sample based on the normalized measurement value of the to-be-measured sample and the absolute calibration value under any characteristic condition. According to the invention, accurate and reliable measurement of the BRDF value of the measurement sample can be simply and accurately realized.

The application discloses a portal crane sling positioning plate mounting method, belongs to the related technical field of the sling, and is characterized in that the upper surface of the sling is provided with front and rear positioning plates at both ends; a front scanner scanning surface intersects with the rear positioning plate, the rear positioning plate surface is inclined forward, namely, the rear is high and the front is low, and the vertex of the rear positioning plate scanned by the front scanner is a front scanner positioning plate detection point; a rear scanner scanning surface intersects with the front positioning plate, the front positioning plate surface is inclined backward, namely, the front is high and the rear is low, and the vertex of the front positioning plate scanned by the rear scanner is a rear scanner positioning plate detection point. The application is used for solving the technical problems of the prior art, such as water accumulation in the positioning plate, poor detection reliability of the positioning point and poor shielding performance.

A special-shaped battery pack gravity center measuring device disclosed by the present invention comprises a supporting assembly, a bearing assembly and an angle indicating assembly, the supporting assembly is provided with a supporting end, the bearing assembly is movably placed on the supporting end, the supporting end is provided with a zero-scale vertical marking line, the angle indicating assembly comprises a graduated scale and a leveling pointer, and the graduated scale is provided with a vertical marking line. The bearing assembly is provided with a zero-scale vertical marked line, the scale ruler is fixed to the side wall of the bearing assembly, the leveling pointer is fixed to the side wall of the bearing assembly, and when the bearing assembly is horizontal, the leveling pointer coincides with the zero-scale vertical marked line. By reading the distance between the graduated scale and the end face of the battery pack, the gravity center of the battery pack is accurately measured, the gravity center measuring method of the special-shaped battery pack is simplified, the gravity center of the battery pack is economically and reliably measured, and the working efficiency is improved.

The invention discloses a fish body length measuring method and system. The method is realized based on geometric measurement and statistical model fusion. According to the method, stable and reliable fish body length measurement under the conditions of complex fish body postures and segmentation errors is realized by constructing a two-channel length estimation method of a geometric measurement and area statistics model and combining a shape quality index-based adaptive fusion mechanism. Specifically, geometric measurement length is obtained through fish body contour extraction and skeleton analysis, a statistical length estimation model is constructed based on fish body area and shape features, and area estimation length is obtained. In order to improve the stability of the system in a complex scene, a self-adaptive fusion mechanism based on a shape quality index is further constructed, indexes such as fish body contour integrity, contour smoothness and a region filling rate are evaluated, and a measurement credibility weight is calculated; and carrying out adaptive fusion on the geometric measurement result and the area estimation result according to the weight to obtain a final fish body length estimation value.

This application provides an ion implanter, including a vacuum chamber, a temperature probe, and a lead tube. The vacuum chamber contains a target disk for supporting a wafer. The temperature probe includes a temperature sensor, a metal shield, and a cable. The temperature sensor is a non-contact type, mounted on the inner wall of the vacuum chamber and aligned with the surface of the wafer supported on the target disk. The metal shield covers the outside of the temperature sensor to shield it from interference from the ion beam. The cable transmits power and signals to the temperature sensor. The lead tube, a tubular structure, extends through the vacuum chamber to lead the temperature probe cable to the outside of the vacuum chamber. This application's technical solution enables real-time, reliable, and accurate temperature monitoring of the wafer supported on the target disk, ensuring that operators can promptly obtain the wafer's true temperature status and take rapid action in case of abnormal temperature increases to prevent damage to the wafer.

The utility model discloses a large-size inner diameter measuring instrument, which is used for measuring the inner diameter of a workpiece, and comprises a digital display meter, a first mounting seat is connected above the digital display meter, and a second mounting seat is connected below the digital display meter; the fixed measuring head seat is connected with the first mounting seat through a length-replaceable extension rod, and a fixed measuring head is arranged above the fixed measuring head seat; the measuring rod body is connected with the second mounting seat through a detachable protective bridge, a movable measuring head is mounted at the bottom of the measuring rod body, and the distance between the movable measuring head and the fixed measuring head is the inner diameter size of the workpiece. The extension rods with different lengths and the protection bridge structures with different types can be replaced to measure different sizes, the application occasion is expanded, various different sizes can be conveniently measured, the measurement precision is high, and most measurement requirements are met.

The invention relates to a shield tunneling machine main drive sealing structure, a manufacturing method and a temperature monitoring method. The shield tunneling machine main drive sealing structure comprises a sealing piece body used for sealing a shield tunneling machine main drive, and the sealing piece body is provided with a lip which is in sealing contact with a driving shaft of the shield tunneling machine main drive in an assembling state; the temperature sensor is embedded in the position, close to the lip, in the sealing element body, and the temperature sensor is used for collecting the temperature value of the lip position or the temperature value close to the lip position. The technical problems that the real-time temperature measurement precision of the main drive sealing structure of the shield tunneling machine is low, the reliability of the measurement result is poor, and the installation structure of the measurement device is complex are solved.

The present invention provides an angle sensor based on a hyperbolic lens and a measurement method thereof, wherein the angle sensor comprises a photodetector 1 and a photodetector 2, a hyperbolic lens 1 and a hyperbolic lens 2, wherein the hyperbolic lens 1 is arranged between the photodetector 1 and the transmission component, and during the measurement process in which a light beam is transmitted from a light-transmitting hole to the same photodetector, the light beam emitted from the light-transmitting hole is incident on the hyperbolic lens 1, and after being transmitted by the hyperbolic lens 1, is incident on the photodetector 1; a processing system processes and obtains the rotation angle value of the measured object according to the incident position change value of the light beam received on the photodetector 1 and / or the photodetector 2. The novel angle sensor can not only realize continuous angle measurement, but also has high precision and fast calculation speed.

The invention belongs to the field of plasma electron density measurement, and discloses a plasma electron density measurement device and method based on laser wavefront analysis. The device adopts a frequency doubling crystal to convert a fundamental frequency laser beam into a fundamental frequency light beam and a second harmonic light beam which are coaxial; the two coaxial laser beams generate different wavefront changes when passing through the plasma, and the wavefront changes are converted into focus spot centroid displacement changes through the micro-lens array; different from other measurement modes, the device needs to set probe light and reference light, does not need to compare before and after plasma, and only needs to refer to the change difference of focus spot centroids after two coaxial laser beams with different wavelengths pass through the plasma; by adopting the measuring device, the interference of neutral particles in the experiment process can be eliminated, the difference between the presence and absence of plasmas in two lasers in the experiment can be eliminated, synchronous compensation can be realized, and the problem that the measurement precision is limited as a reference light path arranged in the prior art is easily influenced by the environment is effectively solved.

The utility model discloses a detection device for fuel cell production, which comprises a device seat plate, the top of the device seat plate is fixedly provided with an inverted L-shaped baffle plate, the two sides of the interior of the inverted L-shaped baffle plate are respectively and fixedly provided with a width measuring scale and a length measuring scale, the top of the device seat plate is provided with a long chute, and the length measuring scale is arranged in the long chute. A movable sliding block is installed in the long sliding groove, and a top measuring baffle capable of being rotationally adjusted and an inverted-L-shaped abutting clamping plate used for fixing a battery are installed at the top of the sliding block. The detection device for fuel cell production has a convenient measurement structure, can effectively measure fuel cells of different sizes, and is high in measurement speed, high in efficiency and high in measurement precision, so that the detection quality and the fuel cell processing quality are effectively ensured.

The application discloses a standard nozzle flow calibration method for an aero-engine, which uses two measured nozzles in a laboratory environment as traceable standards and uses an oil line communicator to connect and calibrate, the oil line communicator is a symmetrical U-shaped pipeline, the middle part is connected with an oil supply pipeline, and the two ends of the U-shaped pipeline are provided with internal thread holes, the flow of the traceable nozzle and the working standard nozzle on the oil line communicator is compared, the relative error is calculated, and the flow value of the working standard nozzle in the simulation laboratory is converted, the application provides a reliable aero-engine fuel nozzle calibration method, the flow of the nozzle can be measured in a non-laboratory environment, the measurement is reliable and stable, and the efficiency of nozzle flow measurement is greatly improved.

The utility model discloses a mechanical gas pressure detection loop. The mechanical gas pressure detection loop comprises a quick exhaust valve, a pressure gauge, a one-way valve and a vacuum pressure gauge. A first air outlet of the quick exhaust valve is connected with a pressure gauge; an air inlet of the one-way valve is connected with the vacuum manometer; an air inlet of the quick exhaust valve and an air outlet of the one-way valve can be connected to the air path, so that positive-pressure air in the air path can flow to the pressure gauge, or negative-pressure air in the air path can flow to the vacuum pressure gauge. According to the mechanical gas pressure detection loop, the pressure of a gas circuit to be detected is accurately and reliably measured under the condition that no electrifying equipment is used, abnormal reading of a pressure gauge or damage to a gauge body caused by the fact that a single pressure gauge is connected rationally is avoided, meanwhile, wrong measurement is also avoided, the gas pressure measurement range is expanded, and the working efficiency is improved. And the environmental adaptability of gas pressure detection is improved.

A sensor installation cloth traction device comprises a moving device, the moving device is installed on a rail, the moving device comprises a moving seat, and the moving seat is in sliding fit with the rail; the moving seat is connected with a weight box through a bearing beam, a driving device is installed on the bearing beam and used for driving a driving tooth to move, and the driving tooth is meshed with a rack of the track; and a storage cylinder is mounted on the moving seat and is used for storing sensor mounting cloth. According to the utility model, the sensor mounting cloth can be pulled to move, the sensor mounting cloth can be extended and shortened according to the use length, and the self-adaptive pressing device can automatically adjust the pressing force according to the form of a measured surface, so that the sensor is always kept in good contact with a target surface, and reliable measurement can be realized even on a complicated and uneven surface; and the consistency and accuracy of measurement are improved.