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The wind speed sensor can continuously monitor the wind speed and air volume (air volume = wind speed x cross-sectional area) of the above locations, and display the wind speed and air volume of the roadway in real time. It is an important tool for measuring mine ventilation safety parameters. Its sensor components consist of wind speed sensor, wind direction sensor and sensor bracket.
Principle
Principle of ultrasonic vortex measurement
The ultrasonic wind speed sensor uses the ultrasonic time difference method to measure Detect wind speed measurement. The speed of sound in the air is superimposed on the speed of the air flow downwind.
When the propagation direction of the ultrasonic waves coincides with that of the wind, its speed is accelerated; vice versa if the direction of propagation der ultrasonic waves is opposite to the direction of the wind wind, its speed is slowed down. Therefore, under fixed detection conditions, the velocity of propagation velocity of ultrasonic waves in the air can correspond to the wind velocity function.
Calculated wind speed and direction.
Because the speed of the sound wave is greatly affected by temperature as it propagates through the air, this anemometer detects two opposite directions on two channels, so the effect of temperature on the speed of the sound wave is the Impact is negligible.
A fixed obstacle (orifice plate, nozzle, etc.) is placed in the direction of flow by the principle of pressure difference
A pressure difference is created. By measuring the differential pressure, this can be converted into a flow measurement.
Principle of heat transfer
According to dhe Karman vortex street theory is an infinitely long nonlinear drag body (i.e., vortex-producing body C. When the wind flow passes through vortex-producing body C, two rows of alternating inwardly rotating vortex rows (i.e., airflow vortices) are formed on the downstream side of the body's edge. generates vortex-generating bodies, and the frequency f of the vortex is proportional to the flow velocity V, expressed as follows:
f=St V/d;
Therefore, the ultrasonic wind speed sensor uses the principle of ultrasonic vortex modulation to determine the vortex frequency.
It is mainly applied to the ventilation main return air path, the tuyere, the main underground wind measurement station, the fan Wellhead, the tunnel construction area, the coal mining working area, etc., and the relevant mining company applicable.
