High power electrostatic ultrasonic distance measuring sensor

When ultrasonic distance measurements transducers are made on the tree barriers in transmission corridors, most of the crowns in the corridors are not a smooth surface, the canopy is non-specular reflection of the signal from the ultrasonic detector, ultrasonic absorption effect is large, and the signal received by the ultrasonic ranging device will be greatly reduced. Therefore, to accurately measure the loss.The clearing data below the electric line corridor is the ultrasonic ranging equipment required by the drone is powerful.The transmit power usually requires a maximum effective measurement distance of not less than 7 meters. Because transmission of tree barriers that the line operation and maintenance unit focuses on are A and B tree barriers, that is, when the height of the trees is the maximum sag of the wires.The vertical distance is less than or equal to 5 meters and 7 meters of tree barrier. Second, the ultrasonic probe is sensitive to the absorption rate of obstacles.which should not be too high, otherwise the data recovery signal is weak, the interference data is more, and the data accuracy cannot be guaranteed.

URMOS high-power electrostatic ultrasonic distance measuring sensor is based on the design of ultrasonic electrostatic transducer.Ultrasonic, measuring distance up to 10 meters, and low sensitivity to the absorption rate of obstacles. Another remarkable feature is that the ultrasonic detection angle of the URMOS high-power electrostatic ultrasonic distance measuring sensor is only 150.Most of the ultrasonic sensors have a detection angle of 600. Therefore, the URMOS type sensor has a high ultrasonic measurement angle resolution, and is the preferred sensor for the barrier navigation scheme in the applications such as robots, which is ensuring that the UAV is equipped with an ultrasonic component rectangular distance method. To measure the accuracy of the data obtained from the tree clearance under the transmission line, the ultrasonic ranging component mounted on the UAV described in this paper uses the URMOS high-power electrostatic ultrasonic distance measuring sensor by DFRobot.

The URMOS high-power electrostatic ultrasonic transducers is the arduino control board.The interface mode is RS4$5 and TTL level pulse width. UAV ranging requires data to be transmitted wirelessly,The ultrasonic sensor adopts the RS485 interface to realize the control command transmission. For example, the sensor host passes.The RS485 interface sends a frame command to the ultrasonic module, and the trigger module starts ranging, and then the receiving module returns.In addition, the sensor module can also read the ultrasonic module through the RS485 interface.Current temperature is setting the address of the ultrasonic module, setting the upper limit of the measuring distance of the ultrasonic module, reading the Ultrasonic transducer sensor measures the distance upper limit and so on.

  Adding a circuit of high accuracy transducer distance sensor circuit to the arduino control board of the URM05 high-power electrostatic ultrasonic distance measuring sensor is not easy to implement, so the drone ranging system introduces a DFRduino Expansion VS sensor extension.The board allows the RS485 to be easily connected to the arduino control board. The expansion board has 14 digital ports (including 12 servo interfaces and power interfaces), and 6 analog .it is port and power interface, 1 digital port external power supply terminal, external power terminal and input pins for automatic switching of external and internal power supplies, external powers supply for digital ports, and onboard power.The source switches automatically.

The UAV ranging system hardware is mainly composed of RX600 electric six-rotor UAV, UAV flight control system,communication system, ground monitoring,airborne head, URMOS type has high power electrostatic ultrasonic distance measuring sensor.And SONY NEX-7 type micro single camera and other hardware components. The drone took off under the control of the flight inspector and passed the machine.PTZ cameras and video probes capture aerial attitudes and return them in real time, and flight inspectors analyze ground monitoring station receivers return data, control the drone to fly to the same height as the overhead wire to hover.Measuring the vertical distance between the drone itself and the trees below by the ultrasonic proximity sensors carried by the gimbal.The real-time ranging data and image information are superimposed and transmitted back to the ground monitoring station. When measuring a tree barrier, the flight inspector controls.The drone selects 3 hover points at the same level as the measuring phase and each hover point measurement.Record 10 stable data finally averages the 30 measuring data, the data is approximated as the tree barrier below the phase conductor.