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1.问:在压电加速计检定规程中,为什么对压电加速度计的外壳提出应无明显的机械损伤,安装基面粗糙度不大于Ra 1.6μm? 答:如果不保证压电加速计外表面的一定粗糙度,将造成外壳出现裂纹和划伤,影响压电加速度计的性能及测量准确度。其理由是: (1)、压电加速度计既作为推动测量又作为冲击测量,如果其外壳有明显的机械损伤,将会影响其强度和谐振频率, (2)、在标准加速度计检定规程中明确要求:“将加速度计与标准加速度计背靠背地刚性连接在一起……”,其目的是两者连接时,
1. Q: Why should there be no obvious mechanical damage to the piezoelectric accelerometer housing in the piezoelectric accelerometer verification procedure, and the roughness of the mounting surface should not be greater than Ra 1.6μm? A: If the piezoelectric accelerometer is not guaranteed The surface of a certain degree of roughness, will cause the shell cracks and scratches, the piezoelectric accelerometer performance and measurement accuracy. The reasons for this are as follows: (1) Piezoelectric accelerometers are used both as a push measure and as an impact measure. If there is obvious mechanical damage to the outer shell, the piezoelectric accelerometer will affect its intensity and resonance frequency. (2) In the standard accelerometer verification protocol Clearly requires: “The accelerometer and the standard accelerometer back to back rigidly connected together ... ...”, its purpose is to connect the two,