67results about How to "Avoid external interference" patented technology

The invention discloses a small size lysimeter suitable for different groundwater depths. The small size lysimeter comprises a measuring inner barrel, a measuring outer barrel, a weighing sensor, a data acquisition unit, a sensor support device, a lithium battery, a water supplying meter, a water supplying pipe, a fixed bolt, a positioning bolt, a handle of a barrelhead, a sealed barrelhead, and a water level control barrel of groundwater. The small size lysimeter has the advantages that the weighing sensor replaces a traditional electronic balance scale, the continuous working of an apparatus is possible, the soil evaporation and the plant evaporation in any period can be automatically monitored, and the measurement accuracy is high; a tipping-bucket rain gauge purchased by a businesslike approach is taken as the water supplying meter, the cost is low, the water supplying meter and a water level control barrel of the groundwater are integrated as a whole, the evapotranspiration research on different groundwater depths is realized, the convenience is provided for the field operation and the construction cost is greatly lowered; the structure is simple, the measurement accuracy is effectively improved due to the fact that a fixed apparatus is used for continuously monitoring data, and the outside interference is avoided, meanwhile the usage and the maintenance are convenient, and can be completed by an ordinary worker.

The invention relates to a water spraying propulsion pump structure capable of measuring the dynamic exciting force of a blade. A cone-shaped through hole of a force measuring machine is consistent with the taper of an inner shaft of the pump, and the through hole and the inner shaft of the pump are connected through a tightening screw in a fastening manner; a cylinder outer shaft of an outer hood I of the force measuring machine is tightly connected with an inner hole of a hub of an impeller through a bolt; twenty-four strain pieces are stuck on four deflection square columns of the force measuring machine so as to form six full-bridge Wheatstone bridges; bearings are fixed on the outer shaft, the outer shaft and the inner shaft are connected through the bearings, the outer shaft is driven by a belt wheel to rotate, and the impeller and the force measuring machine also rotate synchronously. In the rotating process, the four deflection square columns of the force measuring machine are subjected to deformations such as bending and torsion, the twenty-four strain pieces stuck on the square columns are also subjected to the same deformations, and a needed physical quantity can be obtained by using corresponding software.

The invention relates to a gas measuring device and method. The gas measuring device comprises a measuring gas chamber and a reference gas chamber, wherein the reference gas chamber is used for encapsulating a zero-reference gas; and a circuit on the gas measuring device is symmetrically provided with sensors which correspond to the reference gas chambers. The gas measuring method comprises the step of automatically carrying out regular zero calibration by utilizing a zero-reference signal acquired by the sensor arranged corresponding to the reference gas chamber. The gas measuring device and method does not need to carry out the regular zero calibration based on an externally input zero-reference gas, thereby ensuring that the standard of gas measurement is more accurate and then ensuring the accuracy of the gas measurement.

The invention discloses a device for testing the conduction of electric network peak. The device comprises a metal screen cavity (4) which is internally provided with a coupling network screen cavity (5); a network connecting wire (1) is connected with the coupling network circuit in the coupling network screen cavity (5) by an arrival line (3) of the coupling network; the electric network signal processed by the coupling network is connected with the outlet terminal (9) of the testing device by an outlet line (7) of the coupling network. The invention solves the problem that the amplitude of network source equivalent to the electric network peak signal can not be accurately detected in the prior art and has the effect of simple structure, high measuring accuracy and convenient use, etc.

The invention relates to a receiving antenna and a signal processing method, belonging to the signal processing field, and specifically relates to an in-hole receiving antenna and signal processing method of a three-component time-domain electromagnetic method. The in-hole receiving antenna of the three-component time-domain electromagnetic method includes a skeleton and a frame, wherein a Z component coil which is used for receiving secondary field signals from the vertical direction is wound on the skeleton; and the frame is vertically arranged at two ends of the skeleton, and an X componentcoil or Y component coil for receiving secondary field signals from the horizontal direction is wound on the frame. The in-hole receiving antenna of the three-component time-domain electromagnetic method has the advantages that the structure is easy to feed into a drill hole for performing in-hole signal reception, thus being able to avoid external interference caused by underground electrical equipment, and at the same time the receiving antenna can receive transient field signals from three directions, thus being able to obtain more real three dimensional detection data, and preferably reflecting the three dimensional information of the detected object.

The invention provides a multi-way signal conversion and transmission device and a method based on controller area network (CAN) bus. The multi-way signal conversion and transmission device comprises a signal acquisition unit, a controller area network (CAN) communication unit and a liquid crystal display unit, wherein the signal acquisition unit comprises two sets, each set comprises a three-way absolute type optical electric axial angle encoder and a main control chip, an station selection code (SSC) interface module of the main control chip is connected with the three-way type optical electric axial angle encoder through a multi-way strobe; a built-in CAN module of the main control chip is connected with a driven end of a CAN communication unit; the driven end of the CAN communication unit is connected with a receiving terminal of the CAN communication unit through the CAN bus; the receiving terminal is connected with the built-in CAN module of the control chip of the liquid crystal display unit; and the control chip of the liquid crystal display unit is connected with a light emitting diode (LCD) liquid crystal display. According to the invention, the synchronizing serial signal can be converted to the CAN signal quickly, accurately and stably, then is transmitted through the CAN bus, and the accuracy and reliability of the signal transmission of angle of pitch can be ensured.

The invention belongs to the technical field of parameter identification of insulating dry type bushings in power equipment and discloses a multi-parameter intelligent identification system and application of a high-voltage dry type bushing. The multi-parameter intelligent identification system is provided with transformer bushings, an integrated miniature broadband micro-current sensor, a temperature-pressure composite sensor and optical fiber communication; the transformer bushings, the integrated miniature broadband micro-current sensor, the temperature-pressure composite sensor and the optical fiber are synchronously triggered to form a cascade structure, multiple bushings can synchronously acquire multiple parameters, and meanwhile, the optical fiber is used for data transmission, so external electromagnetic interference can be inhibited. According to the system, synchronous acquisition of various parameters is realized, data transmission is carried out by using the optical fiber, and external electromagnetic interference can be effectively inhibited. The system is advantaged in that a magnetic core and a coil of the sensor are optimally designed, so the sensor has relatively high bandwidth and sensitivity at the same time, and meanwhile, the size of the sensor is greatly reduced.

The invention provides a spray collecting device. The spray collecting device comprises a collecting chassis, a collector, a cover plate, a pull rod, a lever, a lever rotating shaft, a waterproof boxmounting plate, a waterproof box, an electromagnet and a connection pin. The collecting chassis is a square box body; the collector is installed in the collecting chassis and can be taken out form oneside of the collecting chassis; and the cover plate is installed in a clamping groove of the collecting chassis, is positioned at the upper portion of the collector, is attached to the collector, andcan slide back and forth. The spray collecting device can avoid external interference in the collecting process, the problem that abnormally distributed liquid continues to flow into a liquid trap todisturb normal collection after a nozzle is opened and closed, the whole spray device is simple in structure, an experimental device is convenient to operate and adjust, manufacturing and maintenancecosts are low, the stability is good, the reliability is high, and the engineering application is facilitated.

The passenger car comprises a passenger car. The passenger car comprises: a carriage, wherein a first partition area and a second partition area are arranged in the carriage; a partition structure which is arranged in the carriage and used for partitioning the first partition area and the second partition area, the partition structure comprises a partition sliding door, a bottom guide rail and a top guide rail, the top of the partition sliding door is in guide fit with the top guide rail, the bottom of the partition sliding door is in guide fit with the bottom guide rail, and the top guide rail and the partition sliding door are vertically pressed after the partition sliding door is installed on the bottom guide rail. The partition sliding door is arranged behind the bottom guide rail, thetop guide rail is pressed against the top of the partition sliding door, the up-and-down movement amplitude of the partition sliding door is reduced, under the guiding action of the top guide rail and the bottom guide rail, the movement amplitude in the inside-outside direction of the partition sliding door is small, the stability of the partition sliding door is improved, and the technical problem that large noise is generated in the running process due to the fact that an existing partition sliding door in a passenger car is poor in assembling reliability is solved.

The invention discloses a high-precision ultrathin sheet overlapping, stacking and connecting machine and an overlapping and connecting method thereof. The high-precision ultrathin sheet overlapping and connecting machine comprises a first sheet positioning jig, a second sheet positioning jig, a third sheet positioning jig, a first transferring device and a second transferring device. According tothe scheme, a fixed positioning pin and a movable positioning pin are respectively arranged on the plurality of jigs, so that the movable positioning pin is connected with a micrometer, the positionof the movable positioning pin can be accurately determined through the micrometer, and the position precision of the movable positioning pin is greatly ensured; meanwhile, during the subsequent adjustment of the movable positioning pin, the adjustment can be carried out by referring to micrometer data of a previous jig, thereby facilitating the improvement of the adjustment efficiency of the movable positioning pin, or the adjustment of the movable positioning pins of the jigs. Therefore, the mutual verification can be carried out through micrometer data of the positioning jigs, and a technical guarantee is provided for overlapping and stacking of multiple layers of materials.

The invention discloses a wireless module testing method and device, and the method comprises the steps of: enabling standard equipment and to-be-tested equipment to determine a frequency hopping group for testing, and enabling different workbenches to employ different frequency hopping groups; screening frequency hopping points used for testing from a frequency hopping group used for testing by the standard equipment and the equipment to be tested, wherein each wireless module to be tested in the equipment to be tested on the same workbench adopts the same frequency hopping point; and enabling the standard device and the to-be-tested equipment to test each to-be-tested wireless module in the to-be-tested equipment on the screened frequency hopping frequency points used for testing. By screening frequency points with less interference, a frequency hopping communication mode, different frequency hopping groups used by different workbenches, combination of multiple technical means such as a unique ID number adopted by each device and the like, batch testing can be carried out on the to-be-tested wireless modules in the to-be-tested equipment, and meanwhile mutual interference in the batch testing process can be avoided.

The invention provides a packaging tube shell for a surface-mounted sensor and the surface-mounted sensor using the same, wherein the packaging tube shell comprises a plastic main body, a metal shielding cover, a first conductive lead and a second conductive lead; the plastic main body is provided with a supporting body through integral injection molding; the metal shielding cover is fixed in the plastic main body through injection molding; the first conductive lead is fixed on the plastic main body through injection molding and comprises a first end exposed out of the outer side wall of the plastic main body and a second end exposed out of the bottom surface of the accommodating chamber; and the second conductive lead is fixed on the plastic main body through injection molding, is not exposed out of the outer side wall of the plastic main body, and comprises a first exposed part exposed out of the bottom surface of the accommodating chamber and a second exposed part exposed out of the support body. In the production and assembly process, the step of independently installing the supporting body, the shielding cover and the second conductive lead is omitted, the manufacturing process of the tube shell is simplified, the production and assembly process is simplified, manpower can be saved, efficiency is improved, and cost is reduced. And meanwhile, the second conductive lead does not form a soldering tin pin, so that a good shielding effect is ensured, and the sensor is prevented from being out of order due to external interference.

The invention discloses an air floatation supporting device with a one-dimensional degree of freedom and an air seal. A model support, air floating shafts and air floating bearings are arranged in a sealing cover to form an air floating platform. The model support is erected between the pair of air floating shafts, the air floating shafts are supported by the air floating bearings, the air floating shafts are in sliding fit with the air floating bearings, and an aircraft model with one-dimensional freedom degree is arranged below the model support; and an outlet of the gas pressure source supplies gas to the air bearing and the sealing cover through the two precise pressure reducing valves respectively. The air floatation supporting device is installed on a long groove, and the long grooveis formed in an upper cover plate of a water tunnel or wind tunnel experiment section and is perpendicular to the incoming flow direction. The aircraft model penetrates through the long groove and isimmersed into the fluid; and the elongated slot and the air floatation platform are sealed with the experimental section by a sealing cover. On the premise of avoiding external force interference, the aircraft model has a one-dimensional degree of freedom in the horizontal direction perpendicular to the flow direction, and vortex shedding and forced vibration induced by fluid force are better restored.

The invention relates to a high-frequency isolation impedance detection method comprising the following steps of: S1, isolating an output voltage signal from an output current signal by using a voltage and current proportional mutual inductor; S2, converting the output voltage signal and the output current signal into a corresponding voltage effective value and a corresponding current effective value respectively by using an effective value conversion circuit; S3, performing analog-to-digital conversion and sampling on the voltage effective value and the current effective value by using a 16-bit analog-to-digital converter, and transmitting sampled data to a single-chip microcomputer by using a digital isolation chip; and S4, computing the sampled data by using the single-chip microcomputer to obtain an impedance value. The high-frequency isolation impedance detection method may accurately and effectively acquire the voltage value and the current value of power output and provides a reliable basis for impedance computation. Further, a circuit employs an isolated acquisition portion so as to be prevented from being interfered with by the fluctuation of an external power supply. The invention also discloses a high-frequency isolation impedance detection system.

A multifunctional and modular geotechnical testing device for testing a soil sample is provided. The testing device includes a testing cell, a plurality of needle probes, and a plurality of lateral pressure-measuring sensors. The testing cell has an oedometer ring for accommodating the soil sample, with a plurality of holes located on and angularly distributed over an internal lateral surface of the oedometer ring forming a plurality of channels to access the soil sample from outside. The plurality of needle probes, each configured to house a pore water pressure-measuring sensor, is detachably mountable to the plurality of channels from outside for simultaneously measuring the pore water pressures. The plurality of lateral pressure-measuring sensors is removably attachable to an inner peripheral side of the testing cell for measuring lateral pressures of the soil sample.

The invention discloses a power cable water inlet sensing device based on a stress enhancement structure. The sensing device comprises three layers of structures, namely a sensing optical fiber, a water absorption expansion material and a stress enhancement structure, wherein the inner layer is the sensing optical fiber, the middle layer is the water absorption expansion material tightly wrappingthe inner-layer optical fiber, and the outer layer is the stress enhancement structure. The sensing device is arranged inside a cable, when water enters the cable, the moisture is absorbed by the middle-layer material and the middle-layer material is expanded, the extrusion effect on the inner-layer sensing optical fiber after water absorption and expansion is enhanced under the constraint actionof the outer-layer stress enhancement structure, the propagation characteristics of an optical signal in the optical fiber are changed, and on-line monitoring of inside water inlet condition of the cable is realized by analyzing the propagation characteristics of the signal of the optical fiber. The sensing device adopts a built-in mode, so that the sensitivity of monitoring and the accuracy of monitoring data are improved, and information support is provided for operation and maintenance of cable lines.

The invention relates to a ceiling type air purification device. The device comprises a shell; the shell comprises a bottom shell and an end cover which are fixedly connected; a plurality of L-shaped fixed plates are connected to a side surface of the bottom shell; two adjacent fan mounting cavities and an air flow cavity are formed in the bottom shell; the two fan mounting cavities are equipped with an air inlet fan and an air outlet fan respectively; the bottom shell is provided with an indoor air outlet and a fresh air outlet; a primary filter, a total heat exchanger and an efficient filter are arranged in the air flow cavity; the bottom shell is further provided with an indoor air inlet and an outdoor fresh air inlet; the air flow cavity is connected with the two fan mounting cavities; outdoor air enters the air flow cavity through the outdoor fresh air inlet and is fed to inside by the air inlet fan through the primary filter, the total heat exchanger and the efficient filter in sequence; and indoor air enters the air flow cavity through the indoor air inlet and is discharged to outside by the air outlet fan through the total heat exchanger. According to the device, the outdoor air is fed to inside by filtering, and the indoor air is discharged to outside, so that the indoor air quality is effectively improved.

A municipal monitoring system for rainwater drainage relates to the technical field of environment monitoring and comprises a rainwater and sewage pipe network detector, a collection valve, a rainwater collection pool, a programmable logic control device, a signal transmission server, a drainage valve, a drainage sensor and a monitoring cloud platform system. The rainwater and sewage pipe network detector, the collection valve, the rainwater collection pool, the programmable logic control device, the signal transmission server, the discharge valve and the drainage sensor are in circuit connection; and the programmable logic control device collects information of the rain and sewage pipe network detector, the rainwater collection pool and the drainage sensor. Signal transmission can be realized through the monitoring cloud platform system, an instruction is sent to the programmable logic control device, the operation of the whole system is controlled, the accumulation capacity of the rainwater collection pool is automatically regulated and controlled, and the labor cost is saved.

The invention relates to payment equipment with high identification precision based on a block chain technology. The device comprises a main body, a base, a pedal, a top plate, an identification mechanism, a shielding mechanism, a display screen, a clamping groove, a light supplementing lamp and two side plates; a processor and a memory are arranged in the main body; the shielding mechanism comprises a baffle, a rotating assembly and two connecting assemblies. The rotating assembly comprises a first motor, a bearing, a lead screw, a moving block and a supporting rod. The recognition mechanismcomprises a lifting assembly, a lifting plate, a reciprocating assembly and a camera. According to the invention, a block chain technology is adopted for data storage, so the data safety degree is high, a stable illumination space is formed through the shielding mechanism, external interference is avoided, the recognition precision is improved, the position of the camera can be adjusted through the recognition mechanism, the camera is made to directly face the human face, the human face is shot from the front face, and the human face recognition precision is further improved.