A hot-wire anemometer comprises a probe. The probe has a probe head disposed at an end thereof. The probe head has an elongated narrow hole or a plurality of round holes being provided with at least a metal wire segment extending in an axial direction of the probe head to enlarge a contact area between the metal wires and a fluid. According to an average temperature of the larger area, a more accurate wind velocity is measured.

A technique enables horizontal measurement of the airspeed of a low-speed flight vehicle. An airspeed measurement system is for a low-speed flight vehicle, and includes a flow sensor that measures an airspeed along at least two axes in a horizontal direction during flight of the low-speed flight vehicle.

A technique enables horizontal measurement of the airspeed of a low-speed flight vehicle. An airspeed measurement system is for a low-speed flight vehicle, and includes a flow sensor that measures an airspeed along at least two axes in a horizontal direction during flight of the low-speed flight vehicle.

The present disclosure describes various systems and methods for measuring environmental parameters. In one embodiment, such as system comprises a pole that is equipped with various instruments (sensors) at various heights along the length of the pole. With such an instrumented pole, a local vertical profile of parameters that relate to wind conditions and air quality can be obtained. These parameters can include one or more of wind speed and direction, air turbulence, air temperature and humidity, concentrations of pollutant gases within the air, and concentrations of pollutant particles within the air. In some embodiments, the system can further measure other parameters that are relevant to the migration of the air and, therefore, the pollutants it contains.

This system (40) for dynamically determining maximum electric current carrying capacities comprises: means (44) for storing a model (54) of a network portion (10), a thermal equilibrium relationship (56), operating limit temperatures and conduction parameters; and a receiver (46) for wind speed values measured by wind measurement stations (24, 26, 28, 30). It further comprises a computer (48) programmed (62, 64, 66, 68) to: apply a model (60) of wind propagation from at least one selected station towards singular points of the model (54) of the network portion, in order to estimate a wind speed value at each singular point; and calculate at least one maximum capacity value at each singular point on the basis of the thermal equilibrium relationship (56), of each operating limit temperature, of each conduction parameter and of weather parameters (58), taking into account said wind speed value estimated at each singular point in the thermal equilibrium relationship (56).

This system (40) for dynamically determining maximum electric current carrying capacities comprises: means (44) for storing a model (54) of a network portion (10), a thermal equilibrium relationship (56), operating limit temperatures and conduction parameters; and a receiver (46) for wind speed values measured by wind measurement stations (24, 26, 28, 30). It further comprises a computer (48) programmed (62, 64, 66, 68) to: apply a model (60) of wind propagation from at least one selected station towards singular points of the model (54) of the network portion, in order to estimate a wind speed value at each singular point; and calculate at least one maximum capacity value at each singular point on the basis of the thermal equilibrium relationship (56), of each operating limit temperature, of each conduction parameter and of weather parameters (58), taking into account said wind speed value estimated at each singular point in the thermal equilibrium relationship (56).

It is described a method for determining a characteristic of air flow close to a surface of a rotating blade of a wind turbine, the method including: measuring at least one value of the temperature of air close to the surface of the blade; and deriving the characteristic of the air flow based on the temperature value.

An unmanned aerial vehicle (UAV) includes a housing forming a central body of the UAV and including an internal compartment, one or more electrical components disposed within the internal compartment and configured to affect operation of the UAV, and an inertial measurement unit (IMU) disposed in an external compartment external to the central body. The IMU is isolated from the internal compartment such that a barometric pressure in the external compartment is independent of a barometric pressure in the internal compartment.

An unmanned aerial vehicle (UAV) includes a housing forming a central body of the UAV and including an internal compartment, one or more electrical components disposed within the internal compartment and configured to affect operation of the UAV, and an inertial measurement unit (IMU) disposed in an external compartment external to the central body. The IMU is isolated from the internal compartment such that a barometric pressure in the external compartment is independent of a barometric pressure in the internal compartment.

An electrical connector includes a main body portion, connection portions, a first temperature sensing element and a second temperature sensing element. The connection portions allow the main body portion to be electrically connected to a charged element provided in a flow channel. The main body portion includes a first side and a second side which are parallel to a flow direction of fluid. The first temperature sensing element and the second temperature sensing element are provided at mutually opposite positions on the first side and the second side in an electrically insulated manner. A fluid state test device having the electrical connector and a fluid heat exchange system are further provided. Thus, the original flow field where the electrical connector of the electrode of the electric heater is located may not change, and destruction to the flow field is avoided.