27results about How to "Improve measurement stability" patented technology

This invention discloses a downconversion fluorescence thermometry method based on bilinear mode, implemented using a hardware system. The hardware system includes a 280nm light-emitting diode, two convex lenses, and a Tb... 3+ :Cs2Na 0.9 Ag 0.1 The system comprises InCl6 temperature-sensing material, a grating spectrometer, an oscilloscope, a signal generator, a computer, and a thermostat. The specific implementation steps are: signal excitation and acquisition; temperature calibration; actual temperature measurement; and high measurement accuracy: VPR mode linear correlation coefficient R² ≥ 0.998, FL mode linear correlation coefficient R² ≥ 0.992, avoiding measurement errors introduced by the exponential bias or correction term of traditional FIR technology, thus fundamentally improving temperature measurement accuracy.

The application relates to the technical field of semiconductors, and provides a micro health detection device. The device comprises a chip-level light source for emitting detection light; a photodiode module stacked above the chip-level light source and facing the light-emitting front surface of the chip-level light source, for receiving light signals transmitted or reflected by the detection light and converting the light signals into electric signals; and an analog front end module stacked above the photodiode module, for receiving the electric signals sent by the photodiode module and processing the electric signals. The device solves the problem of large size of the health detection device in the prior art, reduces the size of the health detection device, and makes the health detection device more suitable for wearable or portable health monitoring applications.

This utility model discloses an electronic working switch, a magnetic particle flaw detector starting circuit, and a magnetic particle flaw detector. The electronic working switch includes: a switch housing, a magnetic field sensor, a magnetic structure, and a magnetic shielding structure. The switch housing has an accommodating space for accommodating the magnetic shielding structure. The magnetic field sensor is disposed on the side wall of the switch housing, and the magnetic structure is disposed on the side wall and opposite to the magnetic field sensor. The magnetic shielding structure is slidably disposed in the accommodating space inside the switch housing to isolate the magnetic field between the magnetic structure and the magnetic field sensor. The electronic working switch in this application converts the positional change of the magnetic shielding structure relative to the magnetic field sensor into a change in the working signal output of the working switch, reducing wear and failure problems caused by mechanical contact and improving measurement accuracy and stability.

This utility model relates to the technical field of sensor probe holding devices, specifically a handheld magnetic ultrasonic probe, including an ultrasonic probe, a holding rod, an outer casing, a switch, an extension cable, and a spring. The outer casing is hinged to one end of the holding rod; one end of the spring is fixed to the lower top surface of the outer casing; a connecting top cover is fixed to the other end of the spring; a switch is fixed to the other end of the holding rod; an electromagnet is fixed to the bottom of the outer casing, and the switch is connected to the electromagnet via the extension cable; the ultrasonic probe is fixed to the bottom of the connecting top cover, and a magnetic shield is threadedly connected to the bottom of the connecting top cover. A signal line cover and a limiting post are threadedly connected to one side of the upper part of the magnetic shield. The ultrasonic probe's circuitry is connected to the measuring instrument via the signal line cover on one side. The electromagnet cover is attracted by the outer casing of the measuring box, thus receiving stable pressure from the ultrasonic probe. The spring inside the electromagnet cover compresses the ultrasonic probe, causing it to fit tightly against the outer casing of the measuring box, reducing the labor intensity of the operator.

The utility model relates to a kind of cylindrical part three-coordinate detection clamping devices, it contains mounting plate and bottom plate, mounting plate is fixed on bottom plate by bolt;Guide rail is fixed on bottom plate by bolt;Slider groove slides on guide rail;Cylindrical slider and slider groove are sliding slot cooperation;Positioning stand is nested in cylindrical slider by pin hole.The application has five parts positioning modules, and there are auxiliary positioning blocks with arc parts, part module, can clamp 1-5 cylindrical parts, parts are fixed in module, three coordinates establish positioning reference on fixed plate, five parts can be accurately positioned.It is independent individual by establishing sub-coordinate system to each part, and is evaluated separately;Save a lot of manpower, time and machine cost.

The utility model discloses a laser displacement sensor shell using a diffusion lens and a linear polarizer in a combined mode, and particularly relates to the field of photoelectric measurement. Comprising a lower shell, the upper cover of the lower shell is provided with a cover plate, the lower shell comprises a bottom plate, the surface of the bottom plate is vertically connected with a U-shaped first baffle, a second baffle is connected between the opening ends of the first baffle, and a first groove and a second groove are formed in the second baffle at intervals; the first groove is located at the receiving end of the laser displacement sensor. A first connecting plate is connected between the opening ends of the first grooves, and a first through hole matched with the first linear polarizer is formed in the first connecting plate; the second groove is located at the transmitting end of the laser displacement sensor; a second connecting plate is connected between the two inner side walls of the second groove, and two second through holes parallel to each other are formed in the second connecting plate. Through the shell, the laser displacement sensor body and each optical element can be integrally packaged.

This invention discloses an indoor mid-to-long-range camera heart rate detection method and system with resistance to environmental interference. The host computer acquires one video stream from each camera to determine the video frame sequence of the current optimal viewing angle. Face detection, tracking, and ROI localization are performed on the video frame sequence to obtain the face ROI region for each video frame. Rigid motion noise filtering is applied to the video frame sequence to obtain an aligned frame sequence and a reference frame sequence. The face ROI region of each aligned frame is determined based on the face ROI region of the reference frame. The ROI signal is determined based on the face ROI region of the aligned frame, and non-rigid noise is filtered out to obtain a pulse wave signal. The heart rate value corresponding to the current sliding window is determined based on the pulse wave signal, and a corresponding quality score is determined. This, combined with a preset correspondence between distance and available focal length, allows for adaptive adjustment of the camera focal length. This invention exhibits high robustness, accuracy, and stability.

The application relates to a double-coaxial microstrip antenna sensing system for horizontal oil-water two-phase flow related velocity measurement, which comprises a test pipeline, a central insert and two coaxial microstrip antenna sensors fixed upstream and downstream of the test pipeline respectively and having the same structure, the coaxial microstrip antenna sensor comprises a receiving microstrip antenna close to the outside of the test pipeline and a transmitting microstrip antenna installed in the central insert, the receiving microstrip antenna comprises a receiving antenna ground plate, a receiving antenna radiation plate and a receiving antenna port, the receiving antenna ground plate and the receiving antenna radiation plate are coaxial, and the receiving antenna ground plate is located outside the receiving antenna radiation plate; the transmitting microstrip antenna comprises a transmitting antenna radiation plate, a transmitting antenna ground plate and a transmitting antenna port, the transmitting antenna ground plate and the receiving antenna radiation plate are coaxial, and the transmitting antenna ground plate is located inside the transmitting antenna radiation plate. The application can meet the high-precision flow velocity detection requirement under complex flow patterns.

This invention discloses a method for in-situ simultaneous and rapid determination of odor and greenhouse gases, belonging to the field of environmental monitoring technology. The method includes: acquiring multiple channels of target gases and simultaneously preprocessing them to generate homogeneous gas samples; using a main detection sensor group and an auxiliary compensation sensor group for parallel collaborative sensing processing to obtain current multi-source sensor data; establishing a dynamic compensation mapping model to characterize the measurement error of gas concentration; inputting the current multi-source sensor data and corresponding current environmental parameters into the dynamic compensation mapping model for calculation, and combining it with the current main detection raw reading to generate current target gas concentration data; associating and packaging multiple sets of current target gas concentration data to generate a synchronous data package and outputting it. By combining the collaborative sensing processing of main and auxiliary sensors with the dynamic compensation mapping model, the method can achieve simultaneous and accurate determination of odor and greenhouse gas concentrations under complex backgrounds.

This utility model relates to an automated spectral detection device for coated film layers, comprising a frame and a conveyor belt rotatably mounted on the frame via two rollers. A U-shaped frame is mounted on the frame, and a spectrometer is mounted on the U-shaped frame via a swing assembly. A drive assembly is mounted on the frame, and the drive assembly is connected to the swing assembly and rollers via a transmission structure and a linkage assembly. When the drive assembly is running, the swing assembly and rollers will run alternately to achieve mutual coordination between the conveyor belt and the spectrometer. Through its unique structural design, this utility model realizes the automated reciprocating swing of the spectrometer, which allows the spectrometer to automatically change its detection angle, effectively reducing the detection blind zone at the edge of the coating and improving the comprehensiveness and accuracy of the detection. At the same time, the linkage between the drive assembly, rollers, and swing assembly realizes the coordinated work of the conveyor belt and the spectrometer, improving the detection efficiency.

This invention discloses a stripe projection 3D imaging system based on a Micro-LED array. Its 3D information acquisition module consists of an integrated packaged Micro-LED driver board, a Micro-LED array, a micro-projection module, and a CCD camera. The 3D reconstruction module utilizes a computer. The micro-projection module is equipped with a plano-convex lens and a mechanical focusing damping structure, and is separately arranged in the front and rear optical paths of the Micro-LED array. The system's workflow is as follows: the driver board reads pre-stored stripe pattern data and timing-controls the Micro-LED array to output coded structured light stripes; the focusing structure adjusts the object distance in the optical path, focusing and scaling the stripes before projecting them onto the surface of the object being measured; the CCD camera simultaneously acquires a sequence of deformed images modulated by the object's shape and transmits it to the computer; the computer combines a multi-step phase-shifting algorithm and Gray code rules to complete phase calculation and unfolding, and, combined with a preset phase-height mapping relationship, reconstructs the 3D shape and point cloud data of the object being measured. This invention enables low-cost, miniaturized, and high-performance 3D shape measurement.

The utility model provides a kind of armoured tungsten-rhenium thermocouple, belong to temperature measurement technical field, this armoured tungsten-rhenium thermocouple, including armoured protection pipe, the tungsten-rhenium electrode being arranged in armoured protection pipe inside, insulation material being filled between armoured protection pipe and tungsten-rhenium electrode, terminal box and sealing assembly being arranged in armoured protection pipe one end, pass through double sealing structure, construct full-closed protection system, can effectively resist the invasion of high-temperature molten gas in metallurgical furnace, strong corrosive medium in chemical reaction kettle, make tungsten-rhenium electrode and alumina ceramic insulation layer exempt from corrosion, compared with traditional thermocouple service life improves 2-3 times.Simultaneously, spring-like elastic support piece and ceramic powder insulation layer form double anti-vibration structure.

This invention discloses a method and apparatus for measuring test conditions of semiconductor devices, relating to the field of semiconductor device testing technology. Addressing problems such as understress testing, overstress failure, and fatigue failure in existing technologies, it employs a measurement device capable of independently powering the main circuit and control circuit of the device under test (DUT) and outputting electrical stress over a wide range. Test conditions are accurately extracted by characterizing the thermal properties of the DUT in the same heat flow mode as the specified test items. This avoids interference between the main circuit and control circuit, bypasses the thermal instability electrical stress range of the DUT, and prevents thermal instability failure, thus improving stability and accuracy. It effectively avoids understress testing, overstress failure, and fatigue failure, improving the reliability of semiconductor devices.

The present application belongs to the technical field of sensor signal processing, and provides a drift suppression method and system for a six-axis sensor, which comprises: obtaining actual operation data of the six-axis sensor, analyzing the actual operation data of the six-axis sensor by using Allan variance, performing cumulative analysis on the drift of any axis within a collection period, and evaluating the drift risk of the six-axis sensor; if the drift risk of the six-axis sensor is high, extracting the instantaneous zero offset of the accelerometer and the instantaneous zero offset of the gyroscope, analyzing whether the zero offset drift trend of the accelerometer and the zero offset drift trend of the gyroscope within the collection period are consistent; if they are consistent, extracting temperature data within the collection period and performing timestamp matching, and judging whether the accelerometer drift and the gyroscope drift are caused by temperature; the present application improves the measurement accuracy and stability of the sensor in a temperature change environment, prolongs the effective use period of the sensor, reduces the replacement demand caused by excessive drift, and reduces the equipment maintenance cost.

The application relates to the field of marine environment monitoring and optical sensing technology, and discloses a seawater surface layer temperature and salinity synchronous measurement system and a measurement method. The system comprises a light source module; an optical sensing module arranged at the seawater surface layer and directly contacted with seawater medium, which forms an output light field with statistical characteristics under the interaction of light and seawater; a light field sampling module which samples the intensity distribution of the output light field and obtains light field statistical data; and a data processing module which constructs a probability model of the light field intensity distribution based on the light field statistical data, extracts a statistical entropy characteristic quantity representing the overall statistical state of the output light field, and inversely obtains the seawater surface layer temperature and salinity by using the response relationship of the statistical entropy characteristic quantity with the seawater temperature and salinity. The application takes the overall statistical state of the light field as the sensing core, has the advantages of strong environmental disturbance resistance, universal structure, easy platform integration and the like, and is suitable for long-term in-situ monitoring of marine buoys, floating balls and the like platforms.

The application relates to a high-power directional coupler for real-time measurement of high-power circular waveguide transmission energy. The design comprises a circular waveguide, two coupling holes and two rectangular waveguides vertically connected with the circular waveguide. High-power microwaves are transmitted in the circular waveguide, the two coupling holes are arranged on the wall surface of the circular waveguide, and the center distance is lambda / 4+n*lambda / 2 (lambda is the transmission wavelength, and n is a non-negative integer). The rectangular waveguide is vertically connected with the circular waveguide through the coupling hole, and the short side of the rectangular waveguide is parallel to the axial direction of the circular waveguide, which is used for receiving coupled energy and measuring transmission power through a power sensor. By averaging the transmission energy at the two coupling holes, the interference error caused by the echo is eliminated, and the forward transmission energy is accurately measured. The design effectively avoids the fluctuation problem in single-hole measurement, has the advantages of wide frequency band, low coupling coefficient, high reliability and high power resistance, and is suitable for real-time measurement and monitoring of high-power microwave system energy.

This utility model discloses a displacement sensor, relating to the field of displacement sensor technology. The displacement sensor includes an electronic chamber, a circuit board support, and a sealing element. The electronic chamber houses a sensitive element and an electronic board. The circuit board support includes a connecting part and a support body disposed within the electronic chamber. The connecting part is connected to the support body and the inner wall of the electronic chamber. The support body is connected to both the electronic board and the sensitive element. The sealing element covers the electronic chamber. This structural design achieves stable fixation of the electronic board and the sensitive element on the circuit board support, ensuring the reliability of their electrical connection and signal transmission. This design effectively reduces the impact of vibration on the components, thereby improving the sensor's measurement accuracy and stability. By optimizing the internal structure of the electronic chamber, the poor vibration damping effect of traditional sealing methods is solved, significantly improving the measurement performance and reliability of the displacement sensor.

The present application relates to the field of petrochemical industry and environmental protection technology, and particularly relates to a multi-core pipe parallel type main and auxiliary cavity cyclone oil-gas-water separation system and a separation method. The method comprises obtaining the time of flight of reflected sound waves and the Doppler power spectral density diagram of the cyclone separation main cavity; determining the axial coordinate sequence and the radial coordinate sequence based on the time of flight; determining whether the cyclone intensity of the cyclone separation main cavity is qualified based on the height difference of the cyclone liquid column; in response to the unqualified cyclone intensity, determining the adjustment direction of the gas phase outlet back pressure based on the cyclone gas core ratio; based on the qualified cyclone intensity, determining whether the cyclone load of the cyclone separation auxiliary cavity is up to standard based on the frequency spectrum width value, and in response to the unqualified cyclone load, prolonging the liquid phase separation time of the cyclone separation main cavity; based on the qualified cyclone load, determining whether there is a downward trend of the oil-gas-water separation efficiency, and enabling sound early warning when the oil-gas-water separation efficiency has a downward trend. The present application solves the problem of lag in sensing the state fluctuation of the oil-gas-water mixed liquid flow field.

This invention proposes a dual-frequency microwave sensor, an oil-water two-phase water cut measurement device and method, relating to the field of petroleum testing technology. The dual-frequency microwave sensor includes a sensor pipe, a shielding layer, and various detection probes. The sensor pipe is cylindrical, with flange interfaces at both ends for connection to oil well pipe flanges. The detection probes include a high-frequency excitation probe, a high-frequency measurement probe, a low-frequency excitation probe, and a low-frequency measurement probe. The high-frequency excitation probe and the high-frequency measurement probe penetrate radially along the sensor pipe in a double parallel line structure, symmetrical about the sensor pipe axis, and are located at the upper part of the sensor pipe. The low-frequency excitation probe and the low-frequency measurement probe also penetrate radially along the sensor pipe in a double parallel line structure, symmetrical about the sensor pipe axis, and are located at the lower part of the sensor pipe. This application helps improve the completeness and accuracy of water cut detection.

This invention discloses a method and system for detecting the low-temperature thermal expansion coefficient of sapphire based on weak measurement, belonging to the field of precision measurement technology of material thermal properties. It applies weak measurement technology to the low-temperature thermal expansion measurement of bulk sapphire materials. By constructing an interference optical path containing the sapphire sample as the optical sensing element, a weak amplification mechanism is used to convert the slight optical path difference (or phase change) caused by temperature changes in sapphire into a significant observable shift in the spectral domain. Then, by measuring the change of the characteristic spectral wavelength with temperature, combined with the known temperature coefficient of refractive index of sapphire, its thermal expansion coefficient can be accurately determined. This invention enables non-contact, high-sensitivity measurement of the thermal expansion coefficient and has strong interference resistance, making it suitable for precise measurement of the thermal expansion coefficient of sapphire and other transparent brittle materials across the entire temperature range from extremely low temperatures to room temperature.

This utility model discloses a combined detection device for lithological density microsphere logging, belonging to the field of petroleum logging technology. It includes an instrument body, a drive mechanism, a microsphere focusing measuring element, and a lithological density measuring element. The drive mechanism is located within the instrument body. The microsphere focusing measuring element measures the resistivity microsphere focusing parameters of the formation within the wellbore. The lithological density measuring element measures the lithological density parameters of the formation within the wellbore. The microsphere focusing measuring element and the lithological density measuring element are respectively located on opposite sides of the instrument body and are connected to the drive mechanism. The drive mechanism is configured to simultaneously drive the microsphere focusing measuring element and the lithological density measuring element to expand radially outward along the instrument body, so that the measuring surfaces of the microsphere focusing measuring element and the lithological density measuring element respectively contact the wellbore. This detection device simplifies the operation process, reduces the workload of logging personnel, lowers the possibility of errors due to cumbersome operation, and improves measurement reliability and stability.

The application discloses a method for detecting activated sludge state based on settling image texture entropy change characteristics, which comprises the following steps: measuring and controlling sludge concentration of a sludge-water mixture sample; placing the sample in a transparent container to make the sludge in a suspended state; fixing the position and focal length of a camera to shoot a video of the activated sludge settling process; cutting a plurality of activated sludge settling images from the video of the activated sludge settling process to obtain an image set; cutting the image set at a proper position; performing pretreatment operation on the cut image set to calculate data of texture entropy change with time at a plurality of different heights; drawing the data into a settling image entropy change hologram; calculating the slope and slope direction of the matrix formed by the settling time, settling height and image texture entropy; drawing a polar coordinate scatter plot of the slope and slope direction data to calculate the normalized sedimentation separation time, normalized clarification degree and normalized compression degree; and analyzing the activated sludge state.

The invention belongs to the technical field of optical fiber heat flux density sensing, and discloses a gradient strain coupling FBG heat flux density sensor preparation method, which mainly comprises an optical fiber microgroove processing technology, a metal bonding layer preparation technology based on a magnetron sputtering technology and a gradient strain coupling sensitive layer preparation technology based on an electroplating technology. The method is characterized in that a microgroove is prepared on the surface of the optical fiber through a hydrofluoric acid wet etching process to improve the bonding strength with a metal layer; a first metal layer with high bonding strength is prepared on the surface of the microgroove optical fiber through a magnetron sputtering process; and a gradient strain coupled second metal layer is prepared on the surface of the magnetron sputtering metal layer through a variable-diameter electroplating process. According to the method, the optical fiber microgroove structure and the oxyphilic metal material are corroded through hydrofluoric acid to improve the bonding strength of the optical fiber and the metal, the FBG spectrum is broadened through the second metal layer subjected to gradient strain coupling, the heat flux density sensing performance is optimized and improved, the method can be suitable for machining of various metalized FBG metal layer structures, the process flexibility is high, and the application range is wide. The depth of the microgroove, the thickness of each metal layer and the gradient strain characteristic of the outer metal layer can be flexibly controlled, the heterogeneous material bonding strength of the special metallized fiber is effectively improved, and the preparation cost of the special metallized FBG is reduced.

This utility model discloses a rebound hammer for non-destructive testing of UHPC compressive strength, belonging to the field of concrete engineering testing technology. It includes a hollow shell, an impact rod, an impact hammer, an impact spring, a guide rod, a hook assembly, and a switch. The impact rod is telescopically connected to one end of the shell. One end of the impact spring is fixed, and the other end is connected to the impact hammer. Both the impact hammer and the hook assembly are slidably connected to the guide rod. The hook assembly can slide along the guide rod and engage with the impact hammer. The switch controls the release of the impact hammer by the hook assembly. The free length of the impact spring is 134.4±0.5mm, and the impact length after stretching is 140.0±0.5mm. The wire diameter of the impact spring is greater than 1.5mm. The UHPC compressive strength regression equation is: ; the value of c ranges from -0.001 to -0.004, where is the average rebound value of the test area or specimen, is the average carbonation depth of the test area, and is the converted value of concrete strength in MPa. This enables non-destructive testing of the compressive strength of UHPC.

This invention relates to the field of brain function monitoring and discloses a closed-loop transcranial photostimulation (tPBM) modulation method and system based on near-infrared brain response characteristics. First, fNIRS signals of the target brain region of the subject are acquired. After the fNIRS signals pass through the data pathway, preprocessing and windowing calculations are performed to extract dynamic response characteristics. By setting the difference detection between the baseline and stimulation periods, blood oxygen response indicators are calculated, and based on these indicators, the current brain region is identified as having enhanced, sluggish, inhibited, or fatigued responses, yielding the change in HbO. Through the real-time acquisition of HbO changes, features such as the instantaneous rate of change and peak response of indicators like Δ[HbO] and Δ[HbR] are extracted to construct an individual's "baseline-response" curve model for parameter optimization and control, completing the tPBM stimulation modulation. This invention solves the problems of equipment redundancy, spatial interference, poor synchronization, difficulty in achieving real-time coordination between intervention and imaging, and poor measurement stability and accuracy in existing technologies.

This invention discloses a method and apparatus for correcting non-uniform response errors in the circular field of view of an infrared spectrometer, relating to the field of spectrometer calibration technology. The method involves acquiring response intensity curves along four orthogonal directions—the field of view axis, the axial direction, and the two diagonals—and converting them into polar coordinate scatter plots. Basis functions are constructed using circular orthogonal polynomials, and a two-dimensional response distribution of the spectrometer's circular field of view is generated through regularized fitting. Subsequently, based on the relative spatial parameters of the target and the spectrometer, the coordinate parameters of the target in the spectrometer's field of view are calculated. The relative intensity value corresponding to these coordinate parameters is then retrieved from the two-dimensional response distribution and used as the field-of-view response correction coefficient. This ultimately achieves precise correction of non-uniform response intensity at different positions within the field of view. This correction method significantly improves the measurement consistency of light signals at various positions within the field of view, is adaptable to lenses with different field-of-view angles, and boasts efficient calculation processes, meeting the practical needs of high-precision spectrometer measurements.