| 摘要 |
An anemometer comprising a planar support 12 which supports a multiplicity of ultrasonic transducers 14, 16, 18, 20, 22, 24. A reflector 26 is spaced from the support and is fixed in position by at least one spacer 28. The ultrasonic transducers are electrically connected to a control and measurement microprocessor and are oriented to send ultrasonic waves towards the reflector and to receive reflections of those waves. The ultrasonic transducers are spaced apart around the spacer, and provide at least three transmitter-receiver pairs whose ultrasound transmission paths are located outwardly of and around the spacer. The invention reduces the effect of wind turbulence caused by the spacer on the measurements. Preferably, there is only one spacer which may be elongate and cylindrical. There may be six ultrasonic transducers, each comprising both an ultrasonic transmitter and receiver. The six transducers may form three pairs of transducers in an equilateral triangle arrangement. The spacing between adjacent transducers may be such that the distance between their vibratory surfaces is greater than the width of the spacer. |
