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中国计量科学研究院于1978年建成了中频振动基准,主要包括正弦振源、振动台振幅测量、中频标准加速度计和电压测量等部分。在该基准中,振动台的加速度失真小于1％,横向振动分量小于3％;振动台的振幅测量采用激光干涉条纹计数的方法;中频标准加速度计采用天然石英晶体作敏感元件;采用真有效值电压表测量电压,测量误差为±0.05％,并采用了隔振基础隔振。该中频振动基准的不确定度示于表1。经过长时期的实际使用,证明它的工作是稳定可靠的。 伹在工作中存在一个问题,即一般被检定的中频标准加速度计的使用范围,在保证误差
China Institute of Metrology in 1978 built a mid-frequency vibration benchmark, including sine vibration source, vibration table amplitude measurement, intermediate frequency standard accelerometer and voltage measurement and other parts. In this benchmark, the acceleration of the vibration table is less than 1% and the horizontal vibration component is less than 3%. The vibration amplitude of the vibration table is measured by laser interference fringe pattern. The IF standard accelerometer uses natural quartz crystal as the sensing element. Voltmeter voltage measurement, measurement error of ± 0.05%, and the use of vibration isolation base isolation. The uncertainty of the mid-frequency vibration reference is shown in Table 1. After a long period of actual use, it is proved that its work is stable and reliable.伹 There is a problem in the work, which is generally used to test the IF standard accelerometer, to ensure that the error