采用外差探测方式,建立了全光纤结构的激光多普勒测振仪, 用来测量经空气传播耦合引起的散射体振动, 以期感知振源振动信息。实验探索了散射体材料、固定方式和相对振源位置等对空气耦合振动的影响, 得到了200~2700 Hz频率范围内6种散射体振动响应特性曲线。结果表明:通过空气耦合引起的散射体振动, 在相同振源振幅下, 散射体振动的振幅一般随频率升高而升高；在材料、固定方式和相对振源位置等因素中, 散射体材料对振动响应特性的影响是主要的, 后两者只影响局部细节。

Using optical heterodyne detection, an all-fiber laser Doppler vibrometer (LDV) was set up to investigate the air coupled vibration of scattering objects so as to recover the vibrating information of the source. Influence of the scattering object properties, such as materials, holdings, relative positions to the source, etc., on the response to the source vibration through air coupling was investigated by the LDV and the vibration frequency response curves ranging from 200 Hz to 2700 Hz for six scattering materials were obtained. Results show that in the case of air coupled vibration of scattering objects, the response vibration amplitude is generally bigger at higher frequency; and the vibration response curve is more affected by the material of the scattering object than by the holdings or relative positions of the scattering object.