测量10开以上的低温,广泛地使用铂电阻温度计,而要测量更低的温度,则采用钢、锗、碳等电阻温度计。但是这些温度计中的大多数,在磁场中都会发生较大的不能容许的电阻变化。例如,在磁感应强度 B=2特斯拉的磁场中,W_(4.2)=6.9×10~(-4)的铂丝在20开时,其 R_(B=2)/R_(B=0)值达到1.2;在 B=0.5特斯拉的磁场中当12开时,铂电阻温度计的测量误差增加到1.3开。这样大的数值是不能允许 Measurement of low temperature above 10kbar is widely used platinum resistance thermometer, and to measure lower temperatures, the use of steel, germanium, carbon and other resistance thermometer. However, most of these thermometers experience large impermissible resistance changes in the magnetic field. For example, the R_ (B = 2) / R_ (B = 0) of the platinum wire with W_ (4.2) = 6.9 × 10 ~ (-4) is at 20 times in the magnetic field with magnetic induction B = 2 Tesla. A value of 1.2 is reached; the measurement error of a platinum resistance thermometer increases to 1.3 at 12 open in a magnetic field of B = 0.5 Tesla. Such a large value is not allowed