32results about How to "Strong measurement accuracy" patented technology

The invention relates to an environmental monitoring system, in particular to a remote wireless environment real-time data acquisition method and a device. The device comprises a management work station and at least one ZigBee wireless sensor network, wherein, the wireless sensor network comprises a coordinator node which is connected with at least one router node; the router node is connected with at least one functional module, and the coordinator node is connected with the management work station by an RS232 interface. The acquisition device in the invention is developed by utilizing an advanced ZigBee wireless sensor network system, has the characteristics of low cost, high reliability, convenience and strong commonality, and can carry out wireless real-time acquisition on outdoor environmental information.

The invention provides a segmented trace hinge moment balance and belongs to the technical field of aerospace force measurement test aerodynamic force measurement. The segmented trace hinge moment balance is of an all-steel-component combined structure. The segmented trace hinge moment balance comprises a measuring device, a thermal insulation device and a limiting protection device. The measuring device comprises a simple-component balance and a six-component beam balance, wherein the central axis of the simple-component balance is perpendicular to the central axis of the six-component beam balance; the simple-component balance is fixed at the free end of the six-component beam balance and is used for measuring a trace hinge moment, and the six-component beam balance measures all the aerodynamic force borne by a control surface and thus corrects the disturbance from the rest of aerodynamic force to the trace hinge moment, so that the resolution ratio and the accuracy of measurement can be improved. The thermal insulation device is arranged on the outer side of the measuring device, so that the heat protection performance and the thermal insulation performance of the measuring device are improved, the temperature effect is reduced, and the accuracy of trace hinge moment measurement in wind tunnel tests under the condition of a high Mach number is improved.

The invention discloses a magnetostrictive/resonator series connection composite resonant magnetic sensor and belongs to the magnetic sensor field. The sensor comprises two magnetostrictive plates, atuning fork resonator, a fixed support structure, an oscillating circuit and a frequency detecting unit. The two ends of the tuning fork resonator are connected to one ends of the corresponding magnetostrictive plates. The tuning fork resonator and the magnetostrictive plates are fixed in the fixed support structure. The tuning fork resonator and the oscillating circuit are connected to form an oscillating circuit loop. The oscillating circuit carries out self-oscillation and outputs an oscillating signal according to the resonant frequency of the tuning fork resonator, and the tuning fork resonator generates resonance according to the oscillating signal. The frequency detecting unit is used for detecting the resonant frequency of the tuning fork resonator. By using the magnetostrictive/resonator series connection composite resonant magnetic sensor, through increasing the length of the magnetostrictive plates, large telescopic deformation is generated so as to improve sensitivity.

The invention discloses a method and a device for tracking the sun by a solar panel. The method comprises the following steps of: 1) determining an optimal placing dip angle of a light intensity sensor used for testing, arraning the light intensity sensor on a test plate, rotating the light intensity sensor used for testing for 180 degrees in an east-west vertical plane or a south-north vertical plane by starting from the fact that the test plate is vertical to the ground plane on the test plate, recording a light intensity value and a corresponding angle value in the rotating process, making a difference between the light intensity values of adjacent items to obtain a point with the maximum difference value, taking the point as a jump point of the light intensity, taking an angle corresponding to the jump point as an optimal placing dip angle of the light intensity sensor used for testing, and according to the optimal placing dip angle, fixing the light intensity sensor used for testing; and 2) on the basis of the light intensity sensor used for testing, which is arranged on a surface plate, executing an automatic light following step, and regulating the dip angle of the surface plate to enable the surface plate to track the sun in real time. The method and the device for tracking the sun by the solar panel have the advantages of high precision and easiness in implementation.

The invention discloses a method for measuring topological charges of an optical vortex. The existing technical method has the disadvantages that the method is complex, the measuring sensitivity is low and is apt to be interfered with and the data processing is complex. The method uses the focusing property of a Lorentz Gaussian beam containing the optical vortex to realize the measurement of the topological charges of the optical vortex. Specifically, the Lorentz Gaussian beam is introduced into the detected optical vortex by using a phase modulation device, then the Lorentz Gaussian beam containing the optical vortex is focused through a converging element, a light intensity distribution curve in a direction perpendicular to an incident beam polarization phase on a focal plane is detected through linear array photoelectric sensors, the valley number of the light intensity distribution curve is the topological charges of the optical vortex, and the decimal fraction of peak ratio of an asymmetrical light intensity distribution curve is an integer-removed remainder of fraction topological charges. Therefore, the measuring method provided by the invention has the characteristics of simplicity, convenience in realization, high interference resistance, high measuring accuracy, simple data processing and the like.

The invention discloses an absolute linear displacement sensor based on decimal shift coding. The absolute linear displacement sensor based on decimal shift coding comprises a light emitting component, a movable ruler base, a fixed ruler base, a photoelectric detector and a signal processing circuit; an absolute code channel and an incremental code channel are on the movable ruler base; decimal shift codes are engraved on the absolute code channel; uniformly distributed rectangular light transmission surfaces I are engraved on the incremental code channel; light emitted by the light emitting component can form a light intensity alternative illumination area acting on the absolute code channel and the incremental code channel; a long strip-shaped light transmission surface and four sets oflight transmission surfaces are on the fixed ruler base, and arranged according to a specific space position; after an electric signal reflecting the absolute position output by the photoelectric measuring head of the photoelectric detector is processed, an absolute position value is obtained; after four light current signals reflecting incremental displacement are processed, an incremental displacement value is obtained; and the absolute position value is added with the incremental displacement value, so that an absolute linear displacement value is obtained. According to the absolute lineardisplacement sensor based on decimal shift coding disclosed by the invention, the absolute linear displacement can be precisely measured; the graph coding difficulty can be reduced; and the measurement reliability can be improved.

The invention belongs to an electricity and sound energy conversion structure, and particularly belongs to an ultrasonic transducer and a nested structure thereof. The nested structure comprises a first filling body mounted at the bottom of a shell; a first functional body is mounted at the top of the first filling body; a second filling body protruding upwards is arranged in the middle of the upper surface of the first functional body, and a second functional body is arranged at the top of the second filling body; and the first functional body is made of a low-frequency ultrasonic emission material, and the second functional body is made of a high-frequency ultrasonic emission material, wherein the sectional area of the second functional body is smaller than that of the second filling body; and the sectional area of the first functional body is smaller than that of the first filling body. The thickness of the first filling body in the central circular area of the nested structure is small, and the thickness of the second filling body in the peripheral circular area is large; and the first filling body uses a high-frequency transceiving piezoelectric sheet as an excitation element,and the second filling body uses a low-frequency piezoelectric wafer or piezoelectric ring as an excitation element, so that double-frequency-point work is realized.

The invention discloses a method for testing the viscosity of an organic carrier for photovoltaic positive silver paste. The steps of the test method are as follows: a. First, fill a measuring cup with 15ml-25ml of organic carrier; b. Put the measuring cup into the rotating speed Centrifuge in a centrifuge at 400rad/min~800rad/min for 3min~5min until the foaming is completely removed; c. Increase or decrease the organic carrier in the measuring cup after centrifugation to the specified capacity; d. Put the measuring cup with the specified capacity The cup is fixed in a small sample adapter with constant temperature circulating water and kept warm for 10min to 25min; e. After the viscometer is zeroed, the organic carrier after heat preservation is tested, and the viscosity value of the organic carrier at the specified speed can be read. The test method of the invention can quickly and thoroughly remove the randomly generated air bubbles in the organic carrier, improve the accuracy of the viscosity test, and improve the production efficiency and product quality stability of the photovoltaic positive silver paste.

The invention provides an electric energy metering method which relates to the field of electric energy metering. The invention solves the problem that unstable distortion signals among power grid signals make the measurement of electric energy inaccurate. Two standard sinusoidal signals are inputted to the shaping signal input end of a shaping circuit and the input end of a multiplication type D/A converter respectively; the shaping circuit outputs a square wave signal, and the square wave signal is added to the input end of a phase locked loop (PLL) circuit; and through the PLL circuit, the signal is transmitted to a frequency divider circuit, and then to an ROM memory, so as to realize that the phase locked loop circuit controls the ROM memory to send a digital signal. Another standard sinusoidal signal and the digital signal undergo mixed analog and digital multiplication in the multiplication-type D/A converter to form a distortion signal; and an ARM controller controls a DSP to carry out wavelet analysis, reconstruction and calculation on the distorted signal. According to specific situations, the distorted power grid signal is decomposed into different frequency bands for electric energy measurement. The method is used for electric energy metering.

The invention belongs to the technical field of steel wire rope tension monitoring, particularly relates to a traction steel wire rope tension monitoring and alarming device in overhead power transmission engineering, and solves technical problems in the background art. The device comprises a support plate. An end baffle is fixed on the support plate; a bearing seat is fixed on the support plate below the end baffle, a connecting shaft is matched in the bearing seat through a linear bearing, a pressure sensor is arranged between the upper end of the connecting shaft and the lower end of the end baffle, and a movable roller is mounted at the lower end of the connecting shaft; two fixed rollers are fixedly connected to the support plate below the movable roller; and the pressure sensor is connected with an intelligent alarm device in which a pressure threshold value is set. The measurement precision is high. The device is suitable for steel wire ropes with different thicknesses and highin applicability; and the pressure of the steel wire rope can be monitored in real time in the working process of a traction machine, threshold exceeding reminding is achieved in time, and a worker can adjust and replace the steel wire rope in time.

The invention discloses a measuring device for the pressure borne by an arc plate type permeable dike in a test water tank, and the device is characterized in that the device comprises an upper structure, a permeable dike main body and a lower structure; the upper structure is used for fixing the permeable dike main body from the upper part; the lower structure is used for fixing the permeable dike main body from the lower part; the height of the permeable dike main body is adjustable, so that the changes of the submergence depth and the clearance of the permeable dike main body in a test process can be realized; the permeable dike main body is composed of two same arc plates, two rows of circular point pressure holes are drilled in two sides of the center line in a wave coming direction of each arc plate, and point pressure sensors are installed in the holes and used for measuring point pressure of the upper surfaces and the lower surfaces of the arc plates. The measuring device is simple in structure, easy to operate, high in measurement precision and high in performance.

The invention discloses a smart cup mat which comprises a control module, a weighing and acquiring module, a water cup communication interface, a charging management module, a battery, a USB charging interface, a wireless charging interface and a wireless data transmission module. The weighing and acquiring module acquires and converts weight information of a water cup into digital quantity information and transmits the information to the control module, the water cup communication interface acquires and transmits water quality parameters and water volume information to the control module, the control module corrects the weight information of the water cup according to the water volume information, the charging management module is connected with the control module, the USB charging interface is connected with the charging management module and used for charging the battery in a wired mode, the wireless charging interface is connected with the charging management module and charges the battery in a wireless mode, and the control module performs information interaction with the wireless data transmission module. The cup mat measurement accuracy can be improved, inconvenience and danger in the charging process can be avoided, and ductility is stronger.