The invention discloses a device and a method for high-accuracy measurement of expansion coefficients of a
metal wire. The method uses a PZT oscillating mirror
system to perform
frequency modulation on incident light at different times, can not only modulate parameter information to be measured to a
phase difference, but also modulate the parameter information to be measured to in a
frequency difference for the convenience of later
signal treatments; and the device consists of an interference
system, a high-speed PZT oscillating mirror
system, a
heating system and a
signal processing system. Comparing the method with other measuring methods, a multi-
beam laser heterodyne measuring method for measuring the expansion coefficients of the
metal wire has the advantages of high space and time resolutions, high measurement accuracy, high
linearity, quick dynamic response, large measuring range and the like, and simultaneously the method has the advantages of simple structure for an experimental apparatus, low
power consumption, convenient operation, high
repeatability, small experimental result error, high accuracy and the like. Because experimental phenomena are obvious and experimental data is reliable, the method and the device can be widely applied in the fields of
engineering designs and the like, and have very high practical values in the field of
laser ultra-precision measurements.