| 摘要 |
The invention relates to a digital holography method for detecting the vibration amplitude of an object (15) having a vibration frequency ω, comprising: generating object illumination waves (Wt) and reference waves (WLO); acquiring interferograms between the reference wave (WLO) and a signal wave (W≯) by means of a bandwidth a s detector (19), the reference wave comprising two components ELO, ELO1 of frequencies ω1, ω2 that are respectively staggered in relation to the laser frequency ωL by a quantity δ1=γ1ω, and δ2=qω+γ2ωδ, where q is an integer and −0.5≦̸γ1, γ2≦̸0.5; and calculating the vibration amplitude of the object from the optical beats spectrum deduced from the complex amplitude of an interferogram. |
