Research and implementation on dynamic measurement method for the vibrating wire instruments

The vibrating wire instrument is a magneto-inductive sensor capable of measuring various physical quantities such as temperature, stress, and displacement. It is widely used in geotechnical engineering safety monitoring due to its excellent long-term stability. The measurement process of this instrument involves two main stages: excitation and pickup, with an intermediate transition process. Traditional measurement methods follow a sequential step-by-step procedure, which results in relatively long measurement times, typically ranging from fractions of a second to several seconds, making it difficult to meet the requirements for dynamic measurement. This paper, based on the operational characteristics of the instrument, introduces a negative feedback excitation mechanism during the measurement of the frequency parameter f, in accordance with the dynamic monitoring requirements. This innovation allows for precise excitation and rapid output tracking of the vibrating wire. Additionally, the integration of high-speed AD acquisition cards and FFT signal analysis techniques overcomes the time bottleneck associated with traditional methods, thus enabling dynamic monitoring capabilities and expanding the engineering applications of the instrument.