Optimized sweep frequency excitation method for vibrating wire collector

Abstract

The invention discloses an optimized sweep frequency excitation method for a vibrating wire collector. The optimized sweep frequency excitation method comprises: a first step in which in a pre-sweep frequency excitation stage, a pre-sweep frequency excitation range and an impulse sequence incremental step length are set, then a pre-sweep frequency excitation impulse sequence is sent, and vibrationpickup and frequency measurement are performed, whether a vibrating wire is reliably excited is checked according to frequency measurement data, if so, a sensor resonant frequency is acquired, and asecond step is entered, and if not, error processing is performed; a second step in which in a complex sweep frequency excitation stage, a complex sweep frequency excitation range and the impulse sequence incremental step length are set according to the frequency measurement data of the pre-sweep frequency excitation, vibration pickup and frequency measurement are performed after a complex sweep frequency excitation impulse sequence is sent, whether the vibrating wire is reliably excited is checked according to the frequency measurement data, if so, a vibration measurement frequency is returned, and if not, error processing is performed. The optimized sweep frequency excitation method of the invention is provided based on a feedback strategy, can realize self-adaptive sweep frequency excitation under the condition that working parameters of a sensor are unknown, and is reliable and accurate in result.

Description

technical field [0001] The invention relates to the field of vibrating wire collection, in particular to an optimized scanning frequency excitation method for a vibrating wire collection instrument. Background technique [0002] The vibrating wire sensor can be used to monitor physical quantities such as building pressure, settlement, osmotic pressure, and deformation. It is a type of sensor widely used in engineering quality and health monitoring. It is converted into a digital semaphore of a general interface to facilitate data storage and analysis. [0003] Most of the existing vibrating wire acquisition instruments are designed based on the working principle of low-voltage sweep frequency excitation. Compared with the traditional high-voltage plucked string excitation, it has the characteristics of large output signal amplitude, long duration and high measurement accuracy of the trigger sensor. . The vibrating wire sensor is mainly composed of the vibrating wire, the e...

AI Technical Summary

Problems solved by technology

However, since the number of pulses N of the frequency measurement method or the measurement reference signal of the period measurement method are expressed in integers, if the number of pulses of the measurement signal at the end time does not reach an integer value, there will be a quantization error in the frequency measurement

[0011] To sum up: the existing working method of the vibrating wire acquisition instrument has the problem that the sensor signal cannot be measured due to the long time of frequency sweep excitation, the reliability of the measurement is low, and there will be a quantization error in the frequency measurement method

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