13results about How to "Guaranteed measurement stability" patented technology

This application discloses a precision capacitance sensing system, comprising a modulation signal source, a sensitive probe, a differential transformer bridge, a signal amplification link, an analog multiplier, and a low-pass filter circuit, all connected in sequence. It also includes a demodulation reference signal source, the output of which is connected to the second input of the analog multiplier. The demodulation reference signal source is used to generate a multi-frequency combination demodulation reference signal, which is composed of a fundamental frequency component and at least two harmonic components superimposed. This invention also discloses a precision capacitance sensing method. By employing a specially designed demodulation reference signal, this application ensures that the system output remains constant within a continuously varying range of the demodulation phase difference, thereby achieving complete insensitivity to phase difference fluctuations and effectively overcoming the performance bottleneck that has long constrained high-precision capacitance sensing.

This utility model discloses a netball and badminton large coil string shearing machine, including a workbench. Four legs are fixedly installed at the bottom of the workbench, and two large coil string supports are fixedly installed at the top of the workbench. Netball and badminton large coil strings are movably installed between the two supports via positioning pins. Two support rods are fixedly installed at the top of the workbench, and an anti-skip string device is movably installed at the top of each support rod. A meter counter and a meter display are fixedly installed at the top of the workbench, and a fixed plate is fixedly installed at the top of the workbench. A support frame is fixedly installed on one side of the fixed plate, and a rotator is fixedly connected to one side of the support frame. One end of the rotator's movable shaft passes through the support frame and is fixedly connected to a take-up reel. This netball and badminton large coil string shearing machine solves the problem of stringers often relying on rulers during the stringing process, which easily leads to string tangling, greatly improving the stringer's work efficiency.

The application discloses a bipolar square wave excitation generation and conductivity detection circuit, a direct current bias square wave generation circuit can generate direct current bias square wave excitation signals with different frequencies; a direct current bias generation circuit generates a direct current voltage excitation; the direct current bias of the direct current bias square wave is equivalent to the size of the direct current voltage, and two signals are superposed to form a bipolar square wave excitation signal. An internal reference voltage output by an ADC is used as a voltage source of the direct current bias square wave generation circuit and the direct current bias voltage generation circuit; a node voltage of an ADC acquisition circuit is collected, so that the conductivity and temperature of a medium to be measured are obtained. The excitation and detection mode provided by the application ensures that all circuit voltages are positive voltages, simplifies the structure of the excitation and sampling circuit, is high in measurement accuracy, stable in measurement, low in power consumption and capable of meeting long-term online monitoring requirements.

The present application provides a kind of cantilever resonance frequency and quality factor measurement method and device, compared with the measurement method based on the PLL technology of existing phase-locked loop, can more comprehensively grasp sample magnetic property, and when responding to cantilever quality factor mutation, there is good measurement stability.The measurement method of the present application includes: cantilever driving step, wherein the driving signal of first frequency is used to drive the cantilever to vibrate, and then stop the driving signal;Free decay signal acquisition step, wherein in response to the stop of the driving signal, the free decay vibration signal of the free end of the cantilever is acquired;And data processing step, wherein the acquired free decay vibration signal is processed to obtain the resonance frequency and quality factor of the cantilever.

The invention relates to the technical field of aviation auxiliary power device air inlet channel parameter measurement, and discloses a composite material air inlet channel parameter measurement device, which comprises an installation positioning piece, a composite material air inlet channel parameter measurement device, a composite material air inlet channel parameter measurement device, a composite material air inlet channel parameter measurement device and a composite material air inlet channel parameter measurement device, and is characterized in that the installation positioning piece is matched with an outlet of an air inlet channel in shape; the supporting rod assembly is fixedly installed on the installation positioning piece, the supporting rod assembly is suitable for extending in the radial direction of the air inlet channel outlet, the supporting rod assembly penetrates through the installation positioning piece, a monitoring assembly and an external connector are arranged on the supporting rod assembly, the monitoring assembly is arranged on the inner side of the installation positioning piece, and the external connector is arranged on the outer side of the installation positioning piece; the monitoring assembly is in communication connection with the external connector. The installation positioning piece is arranged at the outlet of the air inlet channel, and the supporting rod assembly with the monitoring assembly is fixedly installed through the installation positioning piece, so that the situation that the monitoring assembly is directly installed on the surface of the composite material air inlet channel to implement destructive connection operation can be avoided, and the monitoring assembly can directly stretch into the outlet of the air inlet channel to conduct parameter measurement.

The utility model provides a kind of photoelectric measuring instrument, comprising: marble measuring base plate, marble measuring base plate upper side is equipped with photoelectric measuring equipment, marble measuring base plate is equipped with environmental control box on the outside of photoelectric measuring equipment, the environmental control box includes box support frame, the box support frame lower end is installed on marble measuring base plate, equipment controller is equipped with on the outside of box support frame, a plurality of reinforcing support rods are equipped on the box support frame, fixed box door is equipped with on the one side of the box support frame front end, and the other side is equipped with sliding sealing box door, measuring light supplementing equipment is equipped with on the box support frame upper end, temperature control device is equipped on the box support frame. The utility model not only can realize the quick measurement of electronic equipment, and, can provide more stable measurement environment, ensure measurement accuracy and stability.

The application discloses a kind of based on non-invasive temperature monitoring's superhigh pressure container process phase identification method, it is related to superhigh pressure container monitoring technical field.The upper end cover of the working cylinder body of the superhigh pressure container is installed with at least two temperature sensors in non-pressure area, and the lower end cover is also installed with at least two temperature sensors in non-pressure area;The method comprises the following steps: synchronously collecting the temperature time series data of each temperature sensor;Extracting multidimensional temperature feature vector from the temperature time series data, the multidimensional temperature feature vector includes: the instantaneous temperature difference between the upper end cover and the lower end cover measuring point, the temperature change rate of the upper end cover and the lower end cover measuring point respectively, and the time series lag feature of the temperature response of the upper end cover and the lower end cover measuring point;Based on the multidimensional temperature feature vector, the current process phase is identified, and the process phase includes at least one of the pressurization stage, the pressure maintaining stage, the pressure relief stage and the cycle stage.

The utility model is specifically related to a kind of hall flowmeter, including main casing, impeller assembly is equipped in the main casing, installation lower seat is equipped on the main casing, installation upper cover is equipped on installation lower seat and installation cavity is formed between the two, hall sensor assembly is connected in installation cavity on installation lower seat, the hall sensor assembly includes the hall sensor main body and hall sensor pin connected, and installation upper cover lower end is equipped with the abutting portion that abuts with the upper end of hall sensor main body.The hall plate assembly is installed on installation lower seat, then installation upper cover is connected with installation lower seat, the abutting portion of installation upper cover lower end is formed abutting cooperation with hall sensor main body when completing assembly, so that it will not warp, to ensure measurement accuracy and stability.

This application provides a method for predicting the conversion rate and self-correcting parameters of polymerization reactions in a coaxial dual-stirred reactor, relating to the fields of intelligent manufacturing and chemical process control. The method includes: synchronously acquiring real-time torque and current components of the inner and outer shaft drive motors of the reactor, real-time speed of the stirrer, and real-time material temperature; preprocessing the acquired signals; performing a cross-product operation on the preprocessed current and speed, obtaining a dimensionless characteristic ratio after geometric normalization, and collecting its average value during the induction period as a benchmark value; calculating the cumulative deviation of the dimensionless characteristic ratio relative to the benchmark value, taking the moment when the inner shaft current first shows a sustained upward trend as the starting point of the reaction timing; calculating the diffusion limitation coefficient based on the cumulative deviation and the diffusion sensitivity coefficient, wherein the diffusion sensitivity coefficient is adaptively calibrated by the average cumulative deviation within the initial linear interval and the target initial diffusion limitation coefficient; calculating the predicted conversion rate of the polymerization reaction based on the real-time temperature and the diffusion limitation coefficient; and controlling the termination time of the polymerization reaction according to the predicted conversion rate. This invention utilizes existing motor signals from the reactor to achieve online prediction of the polymerization reaction conversion rate, offering advantages such as strong anti-interference capability and adaptability to batch differences.

The application belongs to the technical field of water level monitoring equipment, and specifically discloses a water level monitoring device with a warning function, which comprises a mounting rod, one end of the mounting rod is fixedly connected with a mounting block, a through hole is formed in the surface of the mounting block, and a monitoring mechanism is arranged in the through hole; the monitoring mechanism comprises a sliding rod which is slidingly connected in the through hole, the lower end of the sliding rod penetrates out of the mounting block and is fixedly connected with a first float, and the top of the first float is fixedly connected with a plug block; by arranging the monitoring mechanism and adopting the sectional monitoring design, the first float is used to drive the sliding rod to perform initial monitoring, and the second float is used to perform relay monitoring after the limit is removed, so that the problem that the monitoring rod of the traditional device in a large water level difference water area is too long and is prone to bending deformation under the impact of water flow is effectively solved. The overall structure of the device is more compact and rigid, so that the measurement accuracy and long-term stability of the device in the whole water level change range are ensured.

This invention discloses a three-degree-of-freedom wide-field-of-view multi-line laser 3D reconstruction device for porcelain, enabling the multi-line structured light measurement platform to cover the entire outer surface of the porcelain. The device employs a unique rotation-lift-rotation (RLR) three-axis linkage mechanical structure, driving the open-type support platform and the "head-shaking" sensor platform to move in tandem, achieving flexible and precise adjustment of the imaging system and the porcelain's pose. This RLR three-axis linkage method solves the problem of insufficient coverage of the entire circumference of the porcelain surface and complex occluded areas (such as bottle handles and inner walls) using traditional methods, ensuring high density and high integrity of the 3D reconstruction. The device uses a frame-type support and a three-degree-of-freedom decoupled structure, ensuring overall rigidity and measurement stability, and can adapt to porcelain of different sizes while providing a large coverage area. The system is mainly constructed from standard parts and a series multi-degree-of-freedom mechanism, offering advantages such as low cost and ease of installation and maintenance, providing an efficient, stable, and highly adaptable dedicated solution for high-precision 3D digitization of porcelain.

The utility model discloses a card thickness detection device, which comprises a frame body, a conveyor belt module, a roller detection module, an elastic support module, a damping module, a displacement detection unit and a data processing module, and is characterized in that the elastic support module and the roller detection module act synergistically, so that a roller is contacted with the surface of a card and is jacked up when the card passes through; the elastic supporting module and the damping module cooperate to limit the jumping height of the roller, so that the reset time of the roller is less than or equal to 0.1 second after a single card passes, and the equipment achieves high-precision thickness detection and 0.1-second rapid reset matched critical damping design through the cooperation of elastic supporting and hydraulic damping, and gives consideration to the response speed and stability. The composite supporting structure effectively filters high-frequency vibration and conveyor belt disturbance, adapts to 0.5-2m / s variable-speed operation, and remarkably improves the detection efficiency.