一、引言应用干涉法作成的激光测振仪,早已研制成功并正式投入使用。这种测振仪实际上是用激光器作光源的干涉仪,它以激光波长作为尺子测量物体的振动幅度。这种测振仪的一个反射镜需固定在欲测物体上,必须在室内使用。在四个现代化的建设中,有越来越多的铁路及公路桥樑桥墩需要有先进的测试手段,以保证交通的迅速发展和畅通无阻。根据这种需要我校与济南铁路局共同初步研制成功 I. INTRODUCTION The laser vibrometer made by the method of interferometry has been successfully developed and put into use formally. This vibrometer is actually an interferometer using a laser as a light source, which measures the amplitude of the object’s vibration using a laser wavelength as a ruler. A mirror of this vibrometer needs to be fixed on the object to be measured and must be used indoors. In the four modernizations, more and more railway and highway bridge piers need advanced testing methods to ensure the rapid development and smooth flow of traffic. According to this need, our school and Jinan Railway Bureau jointly developed initially