A downhole flow meter includes a body including an inlet exposed to downhole fluids, an impeller rotatably supported in the body, the impeller including at least one vane, at least one magnet mounted to the at least one vane, and a switch responsive to the at least one magnet arranged in the body.

A recording system for evaluating and analyzing wind resources includes centrifugal mechanism, which includes ring groove, curved block, vertical block, transmission plate and support block; quantitative mechanism, which includes output cavity, output shaft, arc bar, extension shaft and baffle; recording mechanism, which includes the third gear, the first magnet, counting plate and reading pointer; wind power utilization mechanism, which includes power generation shaft, fan blade, generator and power supply; the device is free to rise and fall, suitable for The terrain to be measured can automatically record the wind resources in the survey area, and convert the wind resources into electric energy, so that the user can record the data of wind resources in case of poor illumination, and the device is easy to read and operate. The user only needs to observe regularly.

A fluid sensing device includes an outer shell, a three-axis force and moment balance, a strut, and a centerbody. The outer shell has an inlet at a first end of the outer shell, an aft vent at an opposing second end of the outer shell, and an interior space connecting the inlet and the aft vent. The three-axis force and moment balance is positioned in the interior space of the outer shell. The strut is connected to the outer shell and the three-axis force and moment balance such that the strut supports the three-axis force and moment balance in the interior space. At least a portion of the centerbody is positioned in the interior space of the outer shell. The centerbody is connected to the three-axis force and moment balance such that the three-axis force and moment balance is configured to measure force, moment, and/or movement of the centerbody.

Described is a device for measuring wind conditions during power kite activities. The device comprises an electronic processing unit, an anemometer, and a means of attachment to a power kite. The data from the anemometer is processed by the processing unit and stored locally or transmitted wirelessly to a secondary device (e.g. a smart phone or smart watch). The anemometer directly measures the apparent wind at the kite. In certain embodiments inclusion of an inertial measurement unit and a GPS unit provides a means of calculating the true wind by accounting for induced wind from kite and kiter motion respectively.

Described is a device for measuring wind conditions during power kite activities. The device comprises an electronic processing unit, an anemometer, and a means of attachment to a power kite. The data from the anemometer is processed by the processing unit and stored locally or transmitted wirelessly to a secondary device (e.g. a smart phone or smart watch). The anemometer directly measures the apparent wind at the kite. In certain embodiments inclusion of an inertial measurement unit and a GPS unit provides a means of calculating the true wind by accounting for induced wind from kite and kiter motion respectively.

The present disclosure relates to the field of environment monitoring equipment, and in particular, to a device for determining threshold wind speed in intermittent wind-sand flow. The device includes a base. A rotary bearing is installed on the base. A circuitry is installed in the base. A telescopic rod is installed through the rotary bearing. A wind driven vane and an earth surface wind-sand monitoring frame are installed on the telescopic rod. Photoelectric induction probes are installed on the earth surface wind-sand monitoring frame.

The present disclosure relates to the field of environment monitoring equipment, and in particular, to a device for determining threshold wind speed in intermittent wind-sand flow. The device includes a base. A rotary bearing is installed on the base. A circuitry is installed in the base. A telescopic rod is installed through the rotary bearing. A wind driven vane and an earth surface wind-sand monitoring frame are installed on the telescopic rod. Photoelectric induction probes are installed on the earth surface wind-sand monitoring frame.

System for determining train information relative to a train moving along a railway track having a pressure measuring device placed along the railway track and arranged to measure the speed of an airflow generated by the train when moving on the railway track, and to generate a speed signal; and a controller arranged to receive said speed signal and to determine train information relative to the train in function of said speed signal.

System for determining train information relative to a train moving along a railway track having a pressure measuring device placed along the railway track and arranged to measure the speed of an airflow generated by the train when moving on the railway track, and to generate a speed signal; and a controller arranged to receive said speed signal and to determine train information relative to the train in function of said speed signal.

Methods and apparatus for reducing energy consumed by drones during flight are disclosed. A drone includes a housing, a motor, receiver circuitry carried by the housing, and a route manager. The receiver circuitry is to receive airborne drone-generated wind data from an airborne drone located in an area within which a segment of a flight of the drone is to occur. The airborne drone-generated wind data is to be determined by an inertial measurement unit of the airborne drone. The route manager is to generate a route for the flight of the drone based on wind data, the wind data including the airborne drone-generated wind data. The route is to be followed by the drone during the flight. The route manager is to select at least one portion of the route to cause the drone to be at least partially propelled by wind to reduce energy consumed by the drone during the flight.