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目前,我国在进行四等基线和城市导线测量中,不少单位采用仿照24米殷钢线状基线尺型的钢线尺来测量基线长度。由于钢线尺本身的物理特性,它的温度线膨胀系数(以后简称温度系数)很大。根据物理学手册的资料中查知普通钢和硬化钢的温度系数是不同的,而不同类型的钢线尺其温度系数相对值也可能不一样。测量业务部门一般采用12×10~(-6)的数值作为钢线尺的
At present, in our country for the fourth baseline and urban wire measurement, many units use the 24-meter Invar wire linear baseline ruler to measure the baseline length. Due to the physical characteristics of the wire rod itself, its temperature coefficient of linear expansion (hereinafter referred to as the temperature coefficient) is large. According to the information in the Physics Handbook, it is found that the temperature coefficient of ordinary steel and hardened steel are different, and the relative temperature coefficient of different types of steel wire ruler may not be the same. Measurement business unit generally use the value of 12 × 10 ~ (-6) as a steel wire ruler