7results about How to "Reduce external electromagnetic interference" patented technology

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 utility model relates to the field of automotive fabric technology, specifically to a 3D-MESH fabric for car audio systems. It includes a bottom cover, a top cover, and a fabric material disposed between the two. The fabric material comprises a MESH layer and a metal mesh fabric, which are bonded together using PA mesh hot melt adhesive. The metal mesh fabric includes memory foam fabric, a metal mesh, and carbon fiber fabric. Both ends of the metal mesh are bonded to the memory foam fabric and the carbon fiber fabric. The metal mesh provides better protection, preventing damage to the internal components of the audio system from external objects. The memory foam fabric improves the fit and stability of the audio system installation, reducing vibration and friction noise caused by vehicle bumps. Finally, the carbon fiber fabric enhances the stability of the audio structure, reduces deformation caused by vibration, helps maintain accurate sound quality, and its good thermal conductivity helps dissipate heat, improving system reliability and lifespan.

The invention relates to the technical field of data acquisition devices, in particular to an NB-IoT (Narrow Band Internet of Things) data acquisition board, an Internet of Things data acquisition device and a data acquisition method.The NB-IoT data acquisition board comprises a power input control unit comprising a switching circuit, an NB-IoT communication unit, a UART (Universal Asynchronous Receiver / Transmitter) communication unit and an I2C (Inter-Integrated Circuit) communication unit, the UART communication unit provides a signal transmission and power supply channel for the far-end sensor, the I2C communication unit provides a signal transmission and power supply channel for the near-end sensor, and the power supply input control unit is connected to a power supply and supplies power to the NB-IoT communication unit and the UART communication unit. According to the invention, the sensor data is acquired in a time-sharing manner, after the NB-IoT communication unit acquires near-end sensor data through the I2C communication unit, the switching circuit is controlled to be turned on, the far-end sensor data is acquired through the UART communication unit, and after the far-end sensor data is acquired, the switching circuit is controlled to be turned off by the NB-IoT communication unit. The circuit structure is simpler, the cost is lower, more energy is saved, and the overall cost performance is greatly improved.

The utility model relates to the technical field of horn interface structures, in particular to a double-end horn interface structure. According to the technical scheme, the loudspeaker comprises a shell, a main body connector is arranged in the shell, a connecting assembly is arranged at one end of the main body connector, two sets of end blocks are arranged at the end, away from the connecting assembly, of the shell, a fastening assembly is arranged at the end, located on the main body connector, of the outer ring of each set of end block, and a loudspeaker assembly is arranged in each fastening assembly. And a rubber sheath is arranged on the outer ring of the shell. According to the utility model, through the two-end double-end placement design of the connecting assembly and the end block, bidirectional connection can be realized during wiring, the wiring flexibility is greatly increased, and external electromagnetic interference can be effectively reduced through the mutual cooperation of the multiple shielding layers in the main body joint and the signal columns. According to the utility model, stable and high-quality transmission of audio signals is ensured, the connection mode among the components is simple and clear, installation and disassembly are convenient, and the difficulty and cost of installation and maintenance are reduced.

The invention provides a real-time monitoring device for a reinforcing steel bar protective layer, and relates to the field of building construction, and the device comprises a sensor module which comprises an ultrasonic thickness gauge for measuring the thickness of the reinforcing steel bar protective layer and an electromagnetic inductor for measuring the performance of a reinforcing steel bar; the communication module is used for receiving the measurement information of the sensor module and converting the measurement information into a data form for transmission; the information processing module is used for receiving and processing the data information of the communication module; the power supply module is used for providing energy support for the sensor module and the communication module; the protection shell is fixed on the reinforcement cage in the reinforcement protection layer; and the sensor module, the power supply module and the communication module are all arranged in the protective shell. The method has the effect of improving the accuracy of monitoring the safety performance of the reinforcing steel bars in the reinforcing steel bar protection layer.

A kind of foot pressure sensor, including the sole plate for being connected with the robot sole, the sensing mechanism for sensing pressure change is arranged on the sole plate, further including connecting plate, the connecting plate is vertically fixed on sole plate, the sensing mechanism is fixed on connecting plate and the sensing mechanism is perpendicular to connecting plate.The beneficial effects of the utility model are: by setting connecting plate vertically fixed on sole plate and installing sensing mechanism thereon, avoid the zero drift problem caused by the deformation or vibration of sole plate when sensing mechanism directly contacts sole plate, to significantly improve the accuracy and stability of pressure detection.

The utility model relates to a micro coaxial radio frequency probe card, which belongs to the technical field of probe cards and comprises a substrate main body, fixed protection mechanisms are arranged at the top and the bottom of the substrate main body, and each fixed protection mechanism comprises a fixed support fixedly mounted at the top of the substrate main body. According to the micro coaxial radio frequency probe card, the fixing support fixes the coaxial radio frequency connector through the fixing groove, the radio frequency probe body is located at the top of the coaxial radio frequency connector, the arc-shaped top end of the radio frequency probe body is beneficial to contact with a device to be tested and guarantee accurate transmission of signals, and the protective copper pipe wraps the coaxial radio frequency connector to prevent signal leakage and resist external electromagnetic interference. The positioning block ensures that the coaxial radio frequency connector is accurate in position and prevents displacement; the grounding tube provides grounding shielding for the radio frequency probe, reduces external electromagnetic interference and ensures signal transmission stability; the radio frequency probe body is in contact with a device to be tested during testing, and a signal is transmitted through the coaxial radio frequency connector; and the fixed protection mechanism ensures stable work and accurate test.