85results about How to "High precision measurement" patented technology

The invention discloses a high-precision laser gas detection system, and belongs to the technical field of laser spectrum gas detection. According to the invention, the reference signal feedback drives the laser to realize the locking of the laser output central wavelength. By arranging a half-optical-path sampling hole, double-path acquisition of half-optical-path and full-optical-path interference signals is realized, and when an absorption signal of a full-optical-path digital signal is smaller than a set threshold value, laser fluctuation noise, front half-optical-path interference noise and photoelectric detector noise are eliminated by adopting a double-path signal comparison method; and the interference waveform of the absorption region of the rear half optical path is fitted by combining the light interference Airy model function through the interference signals of the two-wing non-absorption region of the double-path comparison signal, so that the interference noise of the rear half optical path is eliminated, and the measurement precision of the to-be-measured gas at low concentration can be further improved. When the absorption signal of the full-optical-path digital signal is larger than or equal to a set threshold value, the measurement range can be directly and effectively increased by adopting the half-optical-path signal, and the wide-range measurement range is achieved while high-precision measurement is met.

The invention discloses a concrete member crack measurement method based on a convolutional neural network, and relates to the field of concrete crack detection, and the method comprises the steps: carrying out the marking, size clustering, image enhancement, coordinate transformation and other preprocessing operations of a concrete member image, and constructing a detection model architecture; wherein the backbone network adopts a pre-trained ResNet-50 network to extract multi-scale features of the image; the box neck and the box head are used for generating local crack box output; the grid neck and the grid head are used to generate a global fracture grid output. In a model training process, local box output and global grid output are optimized by adopting a joint loss function, and prior category information of crack size clustering is introduced to guide learning of a detection model. In the reasoning stage, an image to be detected is input into the trained detection model, box output and grid output are obtained, and a final crack detection result is obtained through post-processing such as non-maximum suppression. And aiming at low crack detection precision under a complex background, the detection precision is improved.

Provided are an eccentricity measurement method and a measurement system with which eccentricity of an object to be measured can be measured with high accuracy. The eccentricity measurement method includes: a step (S13) for acquiring optical surface measurement data by measuring an optical surface of an object to be measured by a probe (11); a step (S14) for calculating the optical axis center position of the object to be measured on the basis of the optical surface measurement data; a step (S15) for acquiring outer shape measurement data by measuring the outer shape of the object to be measured by the camera (21); a step (S16) for calculating the center position of the outer shape of the object to be measured on the basis of the outer shape measurement data; and a step (S17) for calculating eccentricity, which is the amount of deviation between the center position of the optical axis and the center position of the outer shape.

The invention discloses a passive anti-impact parallel platform which comprises a movable platform, a variable damper, a variable stiffness impact isolator, a static platform, a lower ball seat, an overshoot protector and an upper ball seat, the movable platform is connected with inertial navigation equipment, the static platform is connected with a ship body, the movable platform and the static platform are connected through the variable damper and the variable stiffness impact isolator, and the upper ball seat is connected with the overshoot protector. The lower ball seat is arranged on the surface of the static platform, and the upper ball seat is arranged on the surface of the movable platform. Through the synergistic effect of the variable dampers and the variable-stiffness impact isolators, the platform can efficiently absorb and consume impact energy, the damping force of the variable dampers is increased along with the increase of displacement of the offset balance position, the response of the movable platform is effectively weakened, the movable platform is rapidly helped to recover to the balance position, and due to the multi-stage anti-vibration design of the variable-stiffness impact isolators, the damping force of the variable dampers is reduced. Therefore, when the platform is impacted, initial impact energy can be absorbed with low rigidity, then generation of large displacement is limited with higher rigidity, and the impact resistance is further improved.

The invention discloses a device and a method for synchronously measuring static and dynamic vertical displacements of a structure. The device comprises a test end container, a reference point container, a communicating pipe, a fluid medium, a displacement meter, an inertial mass block and a pressure sensor, the testing end container and the reference point container are connected through a communicating pipe, a valve is arranged on the communicating pipe, the inertial mass block is arranged in the testing end container, the upper end and the lower end of the inertial mass block are connected with the testing end container through elastic elements, and fluid media are contained in the testing end container and the reference point container. The fluid medium is set to enable the gravity borne by the inertial mass block to be equivalent to the buoyancy, and the displacement meter is set to measure and obtain the vertical displacement value of the inertial mass block; the pressure sensor is used for testing the pressure difference value caused by the height difference of fluid media in the test end container and the reference point container at the two ends of the communicating pipe. The system has the remarkable advantages of being rapid and efficient in installation and arrangement, good in structural form and natural environment adaptability, good in economical efficiency and the like.

The utility model relates to the technical field of cleaning of car washers, in particular to a cleaning strength adjusting device for a car washer, which comprises a water tank. A water pipe is installed at the end, away from the water tank, of the pipeline, a water gun head is connected to the end, away from the pipeline, of the water pipe, a filter screen is installed at a water inlet, extending into the water tank, of the pipeline, and the pipeline and the water pipe provide a path for conveying a water source; the variable-frequency water pump is responsible for conveying a water source of the cleaning vehicle, the distance measuring assembly comprises a fixing piece installed on the outer side face of the water gun head, an installation module, an infrared emitting module and an infrared receiving module, and the infrared emitting module is used for emitting infrared light to measure the distance between the spray head and a target; the distance between the water gun head and the vehicle body is detected in real time through the infrared distance measuring transmitter and the infrared distance measuring receiver, water pressure adjustment is achieved in combination with the variable-frequency water pump, automatic pressure reduction is achieved when the vehicle is close to the vehicle body, and vehicle paint is prevented from being damaged.

The present application provides a sensor capable of high-precision measurement with high SN ratio even when the ambient temperature changes, and a bandpass filter for the sensor. The sensor has a light source, a bandpass filter that extracts light of a peak wavelength of the light source, and a light-receiving element that receives the light extracted by the bandpass filter. The bandpass filter has a bandpass layer and a support that supports the bandpass layer. When the thermal expansion coefficient of the bandpass layer is α1, the elastic modulus is E1, the thermal expansion coefficient of the support is α2, and the elastic modulus is E2, α1 > α2 and E1 < E2 are satisfied.

The invention relates to the technical field of fruit tree planting, and discloses a fruit space attitude angle measuring device, which comprises a base, two adjacent sides of the outer wall of the base are respectively and movably provided with a transverse base and a vertical base, and the outer walls of the transverse base and the vertical base are respectively provided with a graduated scale; the scale pointers are rotationally arranged in the middle of the transverse base and the middle of the vertical base respectively, a wiring harness laser lamp and an integrated power source are installed at the end of each scale pointer, and the wiring harness laser lamps are used for marking the positions of the stem and the calyx of the apple on the top face of the base; and the bull eye gradienter is used for adjusting the levelness of the base. The light beam generated by the wire beam laser lamp is aligned with the stem and the calyx of the apple, and the reading of the graduated scale and the pointer is combined to ensure that the measurement result of the attitude angle has high precision and reliability, so that the measurement error is reduced, and high-precision verification data can be provided for a subsequent automatic visual algorithm; the problem that the measurement result is not real and unstable in the prior art is effectively solved.

A physical quantity measuring device (1) includes: a first light source (11) configured to output a first light (L1); a second light source (12) configured to output a second light (L2); an optical sensor (40) letting in the first light (L1) outputted from the first light source (11) and outputting a measurement light (M1) according to a physical quantity of an object and the first light (L1); a wedge (62) configured to let in the measurement light (M1) and the first light (L1) outputted from the optical sensor (40) and output a first outgoing light and let in the second light (L2) outputted from the second light source (12) and output a second outgoing light; a first light path for the first light (L1) outputted from the first light source (11) to be outputted to the optical sensor (40) and for the measurement light (M1) and the first light (L1) outputted from the optical sensor (40) to be outputted to the wedge (62); and a second light path for the second light (L2) outputted from the second light source (12) to be outputted to the wedge (62).

The application discloses a kind of based on the optical wave parameter precision measurement method of cross polarization effect, comprising: step 1, the polarized light of polarization direction as horizontal direction is as incident light to be illuminated to dielectric, and cross polarization effect occurs when reflecting on dielectric interface;Step 2, make reflected light pass through the polarizer, and adjust the polarizer, the central light intensity of reflected light after passing through the polarizer becomes 0, and record the initial angle of the light transmission direction of polarizer and vertical direction at this time;Step 3, the physical quantity to be measured is introduced to incident light, then adjust the polarizer again, when the central light intensity of reflected light becomes 0, record the angle ψ of the change of polarizer from initial angle;Step 4, the change amount of incident light polarization direction after introducing the physical quantity to be measured is calculated according to ψ, and then the physical quantity to be measured is calculated.The optical wave parameter measurement method of the application is simple, low in cost, but the small change of the physical quantity to be measured can be accurately measured.

The invention discloses a wind speed measurement method and system based on a bistatic laser wind finding radar with separate transceiving, the wind speed in the atmosphere is accurately measured by transmitting a laser beam with a specific wavelength and using the Doppler frequency shift principle, the system integrates a plurality of modules, and the system is simple in structure and convenient to operate. Comprising an environmental parameter acquisition module, a Doppler frequency shift correction module, a signal processing module and an intelligent layout optimization module. By collecting environmental parameters in real time, the system dynamically adjusts Doppler frequency shift correction factors to compensate errors caused by environmental changes; the multi-stage signal processing module improves the signal-to-noise ratio and accuracy of wind speed measurement through multi-scale feature extraction, depth separable convolution and adaptive noise suppression technologies; the intelligent layout optimization module dynamically adjusts the position configuration of the base station based on a depth Q network algorithm, and ensures the measurement precision and stability in a complex environment; the method significantly improves the precision and reliability of wind speed measurement, and is suitable for the fields of wind power plant optimization layout, meteorological monitoring, aerospace flight plans and the like.

This patent discloses a design method, acquisition method and device for analog signal acquisition circuit, which belongs to the field of analog signal acquisition. The technical solution provided by this patent can customize the range and preset the measurement accuracy. Without replacing the high-precision analog signal board, it can meet the range of analog signals output by different devices and the different requirements of these devices for measurement accuracy, while ensuring high-precision measurement. The main technical scheme of the present invention is: setting at least one range gear; setting a reference voltage corresponding to the range gear; using the reference voltage to customize the range; using the reference voltage to pre-set the measurement accuracy of the analog signal to be measured. Switch the analog signal to be measured to the appropriate range gear and match the corresponding reference voltage; collect the analog signal to be measured and output the displayed measurement value.

A first radiance meter (21) is directed toward an object to be measured, radiance is measured through a space where dust is present with the use of at least two wavelengths by the first radiance meter (21), second radiance meters (22) which are equal in number to one or more objects (51) having temperatures different from that of the object to be measured (50) are directed toward the objects, radiances are measured through the space with the use of at least two wavelengths by the second radiance meters (22) respectively, and a temperature of the object to be measured (50), a temperature of the dust, and concentration of the dust are measured from the radiances measured by the first radiance meter (21) and the second radiance meters (22).

The present invention discloses a respiratory mechanics measuring device, which comprises: an airway pressure sensor, a gas flow sensor, an esophageal pressure sensor and an intragastric pressure sensor; the measuring device is connected to a gastric tube with an esophageal pressure measuring cuff and an intragastric pressure measuring cuff for use; the measuring device is connected to a tracheal catheter for use. Correspondingly, the present invention also provides a respiratory mechanics measuring system and a respiratory mechanics measuring method using the system. The measuring device provided by the present invention is simple and convenient to operate, low in cost, and accurate in monitoring.

This invention relates to the field of stress measurement technology, specifically to a method for measuring wall shear stress based on an event camera and a micro-cylindrical sensor. This method is used to measure wall shear stress in a flow field and includes: setting the installation position of the micro-cylindrical sensor; setting the light threshold of the event camera; acquiring the pixel position of the bright spot at the top of the micro-cylindrical sensor and the position of the marker point on its substrate at the initial moment based on the event camera; acquiring the pixel position of the bright spot at the top of the micro-cylindrical sensor during operation; and obtaining the wall shear stress in the flow field based on the offset of the bright spot at the top of the micro-cylindrical sensor and the curve between the wall shear stress and the offset of the bright spot at the top of the micro-cylindrical sensor. This invention can significantly improve the detection efficiency of the micro-cylindrical sensor, avoid the problem of uneven LED lighting, and effectively avoid the post-processing difficulties caused by simultaneous illumination from the top and bottom of the micro-cylindrical sensor after lighting.

The invention discloses a circuit breaker opening and closing period monitoring system, which comprises a Hall current sensor, an output signal conditioning circuit, a high-frequency signal coupling circuit, a high-frequency signal decoupling circuit, a DSP microprocessor, a liquid crystal display interface, an alarm module and a communication module, and is characterized in that one end of the Hall current sensor is connected with an opening and closing coil of a target circuit breaker; the output end of the output signal conditioning circuit is connected with the signal receiving end of the DSP microprocessor; the input end of the high-frequency signal coupling circuit is connected with the signal output end of the DSP microprocessor; the output end of the high-frequency signal decoupling circuit is connected with the signal capturing end of the DSP microprocessor; the DSP microprocessor is used for sending a low-voltage high-frequency signal to the high-frequency signal coupling circuit after receiving the voltage signal, and receiving the low-voltage high-frequency signal sent by the high-frequency signal decoupling circuit at the same time. According to the invention, on-line detection of the opening and closing period of the power supply equipment is realized.

The invention relates to a discharge measurement method and device based on a photoelectric integrated electric field sensor, computer equipment, a readable storage medium and a program product, and relates to the technical field of photoelectric measurement. The method comprises the following steps: in response to a discharge measurement instruction for target discharge equipment, carrying out performance detection on a photoelectric sensor to obtain a performance detection result of the photoelectric sensor; the photoelectric sensor is a photoelectric sensor based on the Pockels effect; when the performance detection result reaches a performance threshold value, carrying out discharge measurement on the target discharge equipment through the photoelectric sensor to obtain an optical signal which is output by the photoelectric sensor and aims at the target discharge equipment; performing signal conversion on the optical signal to obtain a discharge signal of the target discharge equipment; performing signal analysis on the discharge signal to obtain a signal analysis result of the target discharge equipment; the signal analysis result is used for representing the signal change condition of the discharge signal in the time dimension and the frequency dimension. The method can improve the accuracy of discharge measurement.

A magnetic sensor (1) according to one embodiment of the present invention is provided with: a magnetic detection unit (2) provided with a magnetoresistive effect element (10) having a fixed magnetic layer (11), a free magnetic layer (13), and an intermediate layer (12) formed between the fixed magnetic layer (11) and the free magnetic layer (13); a magnetic field calculation unit (4) that calculates a measured magnetic field on the basis of the output of the magnetic detection unit (2); and a saturation magnetic field application unit (3) that applies a magnetic field to the free magnetic layer (13) in the direction of the measurement magnetic field to magnetically saturate the free magnetic layer (13), and the magnetic field calculation unit (4) calculates the measurement magnetic field for the free magnetic layer (13) on the basis of a first output of the magnetic detection unit (2) when the measurement magnetic field is applied and a second output of the magnetic detection unit (2) when the free magnetic layer (13) is magnetically saturated. A small magnetic field can be measured with high precision by removing 1 / f noise.

The application relates to a distributed optical fiber sensing system and discloses a fast measurement BOTDA sensing device based on chaotic light polarization orthogonal detection, which comprises a narrow-line-width laser; signals output by the narrow-line-width laser are divided into two paths: one path is used as injection light to enter a chaotic light generation module to make the module output chaotic light with a wide spectrum, the chaotic light is used as detection light and sequentially connected with one end of a sensing optical fiber after passing through an optical isolator, an electro-optic modulator, a polarization maintaining optical fiber and an erbium-doped fiber amplifier; the other path is used as pump light and sequentially connected with the other end of the sensing optical fiber after passing through a semiconductor optical amplifier and a first circulator; after polarization orthogonal detection light is transmitted to the other end of the sensing optical fiber, the polarization orthogonal detection light is output through a first circulator output end and is coherently detected and data processed by a coherent detection module to obtain a Brillouin gain spectrum of the sensing optical fiber along a line. The application can realize Brillouin gain sweep-free measurement and improve the measurement speed.

The utility model discloses a paint film instrument device. The paint film instrument device comprises a limiting plate, a paint film instrument body, a supporting assembly and a clamping assembly, the paint film instrument body is assembled on the limiting plate, a limiting sliding block is arranged on the side face of the limiting plate, and the supporting assembly is provided with a sliding rail groove used for limiting the sliding block to slide up and down. A reset assembly used for driving the paint film instrument body to reset is assembled between the limiting plate and the supporting assembly. The clamping assembly is used for fixing a to-be-tested part plate and is assembled at the bottom of the supporting assembly; according to the device, the paint film instrument body can be rapidly reset through the reset assembly after measurement is completed, the next measurement is immediately prepared, and the measurement rate and the working efficiency are improved; the limiting plate is matched with the clamping assembly to enable the paint film instrument body to be in contact with the to-be-measured part plate, so that the paint film instrument body is kept stable in the measurement process, and the measurement accuracy and reliability are ensured.

This three-dimensional measurement probe (1) is capable of measuring the shape of the surface of an object to be measured with high accuracy, and is provided with: a movable body (10) having a stylus (11) the tip of which is in contact with the surface of the object to be measured; a holding mechanism (20) that holds the movable body (10) so that the movable body (10) can move in the axial direction; a housing (30) that houses the movable body (10) and the holding mechanism (20); and a vibration damping mechanism (40) for damping the vibration of the movable body (10), the vibration damping mechanism (40) having a pin (41) that moves in an axial direction in conjunction with the movement of the movable body (10), and a gel body (42) that has a first plane (42a) and a second plane (42b) that face away from each other in the axial direction, the first plane (42a) and the second plane (42b) being exposed surfaces exposed to an air layer. The pin (41) is inserted into the gel body (42) in the axial direction.

The present invention relates to cells for measuring botulinum toxin activity overexpressing SEPTIN2 or Thioredoxin (TXN), and to a method for measuring botulinum toxin activity, the method comprising the steps of: treating the cells for measuring botulinum toxin activity with botulinum toxin and culturing the cells; lysing the cultured cells and collecting a cell lysate; and measuring the amount of SNAP-25 cleavage products in the cell lysate.

The object of the present invention is to provide a residual stress measuring method capable of measuring the residual stress of a fillet portion with high accuracy. In the residual stress measuring method according to one embodiment of the present invention, when the incident angle of X-rays is Ψ[°], the fillet radius is R[mm], the fillet angle is θ[°], the upper and lower widths of the housing of the X-ray stress measuring device are W[mm], the width of the detection area of ​​the two-dimensional detector is D[mm], the complementary angle of the Bragg angle is η[°], and the interval between the flange portion and the virtual straight line passing through the center of the fillet and parallel to the flange portion is a[mm], the following formula 1 is satisfied, when Ψ≥0, the irradiation distance L[mm] of the X-rays in the calculation step based on the two-dimensional detector satisfies the following formula 2, and when Ψ<0, the irradiation distance L satisfies the following formula 3. The incident angle Ψ is positive when it is inclined toward the shaft portion side relative to the virtual straight line passing through the measurement portion and the center of the fillet, and is negative when it is inclined toward the flange portion side. D≤W···1

A kind of six-freedom absolute deformation measurement method of measuring platform based on single reference point measurement platform, with measuring platform as center, in the measured area, and with measuring platform as the other side of symmetry, reference point is arranged, laser displacement measuring instrument, camera and target are arranged on reference point;Camera is used to collect measuring platform target image on measuring platform;Target on reference point is used as feature recognition point;Two-dimensional inclination measuring instrument is arranged on measuring platform, measuring platform camera and measuring platform target;Measuring platform target is used for collecting image data by camera of reference point;The present application realizes real-time solution to six-freedom (three-dimensional translation+three-dimensional rotation) displacement of measuring platform by single reference point feature identification and measuring platform feature identification, to realize high-precision measurement to position change of measuring platform itself, so that measurement result is more accurate.

The application discloses a detection device and an electronic device. The detection device comprises: a driving unit driving a transmitting unit to transmit first and second modulated light beams; an iTOF unit receiving a first echo light signal of the first modulated light beam; a dTOF unit receiving a second echo light signal of the second modulated light beam; and a processing unit generating a detection strategy based on a first depth map generated by the first echo light signal: when the detection distance of the depth map is less than a first threshold, the driving unit drives the transmitting unit to continue transmitting the first modulated light beam to enable the iTOF unit to realize iTOF imaging; and when the detection distance is greater than or equal to the threshold, the driving unit drives the transmitting unit to transmit the second modulated light beam to enable the dTOF to realize dTOF imaging. The scheme determines the detection strategy through the corresponding detection result of the iTOF unit, ensures that the detection device realizes high-precision measurement in the full detection distance range, reduces energy consumption, and improves the near-distance high-reflection expansion of dTOF imaging.

The utility model relates to a vertical rod type radar liquid level monitoring device. The device comprises a main pipe, wherein a water inlet is formed in the side wall of the bottom of the main pipe; the host module is installed in the main pipe, and the host module comprises a power supply assembly, a control circuit board connected with the power supply assembly, a radar module connected with the control circuit board and a radar lens which is located on one side of the radar module and faces the bottom of the main pipe. According to the utility model, through the modularized host module in the main pipe, the structure is compact, rapid installation and replacement are realized, the radar lens (antenna) can process and optimize the beam angle generated by the radar module and control the beam angle, the application problem of the radar in a narrow pipe diameter environment is optimized, and the measurement error caused by the fact that reflected waves collide with the wall is reduced.

The present application provides a small gas detection device capable of high-precision measurement. The gas detection device is provided with a light emitting portion (10), a light receiving portion (20), and a light guide portion (30) for guiding light from the light emitting portion (10) to the light receiving portion (20). The light guide portion (30) includes a mirror (50) having a shape of a part of a rotating ellipsoid, the mirror (50) being disposed at or near a first focal point of the rotating ellipsoid, the light emitting portion (10) and the light receiving portion (20) being disposed at or near focal points other than the first focal point of the rotating ellipsoid, respectively, and the light emitting portion (10) and the light receiving portion (20) being arranged in parallel with a major axis direction of the rotating ellipsoid.

The application discloses a flexible temperature and pressure sensor based on lensless imaging and a measuring method thereof, and belongs to the technical field of multi-modal flexible sensing. The sensor stack structure comprises an image sensor, a coding mask, a beam splitter, a transparent elastic pressure-sensitive layer, a thermochromic temperature-sensitive film and a top reflective layer in sequence. A side light source forms a normal illumination light path along the stack structure after being folded by the beam splitter. The illumination light is reflected by the reflective layer after penetrating the pressure-sensitive layer and the temperature-sensitive layer, and the light field carrying temperature and pressure modulation information is captured by the image sensor after being spatially encoded by the mask. The application adopts 0D perovskite (C16H20N2) SbBr5 as a temperature-sensitive material, effectively suppresses optical crosstalk noise by combining a differential background subtraction algorithm, extracts a spatial geometric deformation field and an RGB normalized color ratio of a coding pattern synchronously by double-branch preprocessing, and realizes high-precision orthogonal decoupling of temperature and pressure signals by combining global gray feedback closed-loop control. The application has the advantages of ultra-thin structure, flexible sensing layer and strong anti-interference capability, and is suitable for intelligent wearing and industrial curved surface monitoring.

The invention belongs to the technical field of core nuclear magnetic resonance measurement, and provides a mobile core nuclear magnetic resonance measurement method and system based on step length control, and the method comprises the steps: carrying out the calibration of different positions of a coil, and obtaining the calibration coefficients corresponding to the different positions of the coil through a moving stepping mode; after the coil is scaled, the core to be tested is moved to a coil signal acquisition area for testing according to a set step length based on a scale coefficient; during testing, the same stepping mode is kept in the scale process, T2 signals of the full-diameter to-be-tested rock cores at different length positions are obtained, and nuclear magnetic resonance data of the to-be-tested rock cores are obtained through data processing. By means of accurate driving of the stepping motor, errors caused by manual operation or mechanical instability in traditional measurement are eliminated, repeatability and consistency of measurement are greatly improved, and reliable guarantee is provided for subsequent data analysis.

The invention discloses a method for determining time delay, terminal equipment and network equipment, and belongs to the field of communication. The method for determining the time delay in the embodiment of the invention comprises the following steps: acquiring the maximum packet length, the priority, the source node and the destination node of a to-be-deployed service flow; determining a path between the source node and the destination node and each node of the path; and under the condition that the target function corresponding to the priority of the to-be-deployed service flow exists on each node of the path, determining the time delay of the to-be-deployed service flow according to the maximum packet length of the to-be-deployed service flow and the target function, the target function representing the corresponding relationship between the maximum packet length and the time delay of the to-be-deployed service flow.