湖北省随县出土的曾侯乙墓大型编钟是一套音域很广、音色优美的大型古代乐器。每个编钟都可发出双音,敲击钟的正鼓部和侧鼓部分别发出两个不同音高的音声,同时还有一些分音发出。为了研究编钟的发音机理,必须掌握编钟两个基音及一些主要分音的振动模式。我们用正弦电信号激励编钟共振,使编钟进行简谐振动,分别发来不同的音响。而记录简谐振动物体的振动模式,采用激光全息时间平均法是当前最好的方法。我们用时间平均法对一个作简谐振动的物体进行全息照相。设振动物体全息图再象 The large bells of the Tomb of Emperor Zeng, unearthed in Suixian County, Hubei Province, are large-scale ancient musical instruments with a wide range of sounds and graceful tones. Each chime can emit two tones. The drums and side drums of the striking bell emit two different pitches of sound, respectively, while some punctuations are emitted. In order to study the mechanism of the chimes’ pronunciation, one must master the chords of the two fundamental tones and some of the major chromatic patterns. We use a sinusoidal excitation electric chime beats, chimes make simple harmonic vibration, respectively, sent a different sound. While recording the vibration mode of simple harmonic objects, the holographic time-averaged laser holography method is the best method at present. We use the time-average method to make a holographic image of a harmonic object. Suppose the vibration object hologram again like