Multi-channel self-adaptive high-precision LVDT data acquisition and measurement system and method

Abstract

The invention discloses a multi-channel self-adaptive high-precision LVDT data acquisition and measurement system and method. The system comprises a constant-frequency constant-amplitude signal generation unit, a channel gating and LVDT driving unit, an access gating low-noise pre-amplification unit, a programmable gain unit, a true virtual value rapid sampling unit, a motion direction discrimination unit and a microprocessor unit. The constant-frequency constant-amplitude signal generation unit is connected with the channel gating and LVDT driving unit; the channel gating and LVDT driving unit is connected with the access gating low-noise pre-amplification unit; the access gating low-noise pre-amplification unit is respectively connected with the true virtual value rapid sampling unit andthe motion direction discrimination unit; the true virtual value rapid sampling unit and the motion direction discrimination unit are respectively connected with the microprocessor unit; the microprocessor unit is respectively connected with the channel gating and LVDT driving unit and the programmable gain unit, and the programmable gain unit is connected with the access gating low-noise pre-amplification unit.

Description

Technical field [0001] The invention belongs to the field of detecting instrument manufacturing, and relates to a multi-channel adaptive LVDT data acquisition and measurement system and method suitable for engineering micro-strain monitoring. Background technique [0002] At present, a strain sensor called vibrating wire is widely used in engineering construction, bridges, reservoirs and dams. Vibrating wire strain sensors are widely used in geotechnical engineering due to their simple structure and strong anti-interference ability. [0003] However, the vibrating wire strain sensor has also become a subject of widespread debate in the industry due to its obvious technical defects. A vibrating wire strain sensor that uses a tensioned metal string as a sensitive element. When the length of the string is determined, the change in its natural vibration frequency can indicate the magnitude of the tension on the string. The frequency and the receiving force can be obtained through a ce...

AI Technical Summary

Problems solved by technology

2. The temperature effect of the vibrating wire strain sensor is serious

3. The vibrating wire strain sensor is not suitable for use in complex deformation measurement occasions

If the distribution function of the axial change is not uniform, the vibrating wire installed in the vibrating wire strain sensor on the steel body will be distorted, which can be converted into an additional external force in the axial direction, resulting in inaccurate measurement of the vibrating wire strain sensor. precise

Therefore, it is not surprising that there are frequent failures in the use of vibrating wire strain sensors for engineering stress detection.

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