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根据共振声谱原理,针对低频岩石声学参数测量做了初步的实验探讨。建立了一套计算机控制的由锁相放大器、功率放大器以及圆柱共振腔体等组成的共振声谱测量系统,并利用该实验系统对空腔体和腔体中存在扰动体(岩样)时的共振声谱进行了初步测量,考察了小扰动体在共振腔轴线上位于腔体顶部和中部2个位置上的共振频谱。结果表明,所建立的实验系统在测量中是稳定的;腔体中存在扰动体时的共振频率和幅度与空腔体中的共振频率和幅度之间存在比较明显的差别,并且声学参数不同的小扰动体之间的共振频率和幅度也各不相同。
According to the principle of resonance spectroscopy, a preliminary experiment is made to measure acoustic parameters of low frequency rock. A computer-controlled resonant spectroscopy system consisting of a lock-in amplifier, a power amplifier and a cylindrical resonant cavity is established. By using the experimental system, the existence of disturbances (cavities) in the cavity and the cavity Resonance spectroscopy was used to measure the resonance spectra of two small perturbations at the top and middle of the cavity on the axis of the resonator. The results show that the established experimental system is stable in the measurement. There is a significant difference between the resonance frequency and amplitude in the presence of disturbing bodies and the resonance frequency and amplitude in the cavity, and the acoustic parameters are different The frequency and magnitude of the resonance between small disturbing bodies are also different.