热球式电风速计是在一般线型风速计的基础上发展而成的。测头的加热部分为一紧密的镍铬丝弹簧圈,外包低熔点的玻璃球。球内有两个镍铬——鏮铜的热电偶互相串联起来。此种测头能用较小的电流产生较大的电动势,测头热惰性的大小可以调整。可测出0.05米/秒的低风速。仪器的灵敏度约为±1.5％,准确度为±5.0％。受温湿度影响较小,有较好的稳定性,在500小时后无显著影响。 Thermal ball anemometer is a general linear anemometer developed on the basis of. The heating part of the probe is a tight nickel-chromium wire coil, outsourcing low-melting glass balls. There are two Ni-Cr-Cu thermocouples in the ball in series with each other. Such a probe can generate a larger electromotive force with a smaller current, and the size of the probe’s thermal inertia can be adjusted. Measurable low wind speed of 0.05 m / s. The sensitivity of the instrument is about ± 1.5% and the accuracy is ± 5.0%. Little affected by temperature and humidity, good stability, no significant effect after 500 hours.