Since the promulgation of the definition of "meter", laser interferometers have been used as official length standards in national and regional metrology institutions. At present, the factory still uses various gauges and comparative measurement methods to unify various instruments, gauges and length gauges, but it is cumbersome and inconvenient to rely on the mass transfer system. The laser interferometer is used as the factory length standard. Although it can avoid the inconvenience of the gauge system, it requires: 1 instantaneous air refraction value. 2 Accurate absolute value of the measured part temperature. 3 assessment of the accuracy of the interferometer. Therefore implemented
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