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本文介绍一种新型的电风速仪。一般电风速仪用一电阻丝通以恒定电流作为加热元件，由于 加热元件表面散热系数随空气流动速度而不同，因而加热元件和空气的温度差也随空气流动速度 而不同，藉热电偶测量加热元件和空气的温度差即可得该点空气的流速。这种风速仪比较灵敏， 可以测量微小的风速；可是由于它们的加热元件是一条电阻丝，流速相同而方向不同的气流对加 热元件散热系数的影响是不相同的，所以气流方向不同将大大影响风速仪的读数。不定向风速仪 改变了过去电风速仪的结构，将加热元件做成一个金属小圆球，将加热电阻丝封在金属球内。由 于加热元件呈球形，消除了气流方向的影响。文章介绍了这种风速仪的构造，以及关于风向影响 的试验。
This article describes a new type of anemometer. General anemometer with a resistance wire through a constant current as a heating element, the heating element surface heat dissipation coefficient varies with the air flow rate, so the temperature difference between the heating element and air also varies with the air flow rate, by thermocouple measurement heating The temperature difference between the components and the air gives the air velocity at that point. However, due to their heating element is a resistance wire, the influence of the airflow with the same flow velocity and different direction on the heat dissipation coefficient of the heating element is different, so the different airflow directions will greatly affect the wind speed Anemometer readings. Non-directional anemometer has changed the structure of the past anemometer, the heating element made of a small metal ball, the heating resistor wire sealed in the metal ball. Due to the spherical shape of the heating element, the influence of the direction of the air flow is eliminated. The article describes the structure of the anemometer, as well as the wind direction on the impact of the experiment.