Automatic calibration system and method based on LVDT sensor

Abstract

The invention discloses an automatic calibration system and method based on an LVDT sensor. 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 and a microprocessor unit, wherein the output end of the constant-frequency constant-amplitude signal generation unit is connected with the input end of the channel gating and LVDT driving unit; the output end of the channel gating and LVDT driving unit is connected with the input end of the access gatinglow-noise pre-amplification unit; the output end of the access gating low-noise pre-amplification unit is connected with the input end of the microprocessor unit; the output end of the microprocessorunit is connected with the input end of the channel gating and LVDT driving unit and the input end of the programmable gain unit; and the output end of the programmable gain unit is connected with theinput end of the access gating low-noise pre-amplification unit.

Description

technical field [0001] The invention belongs to the field of detection instrument manufacturing, and relates to an automatic calibration system and method based on LVDT sensors. Background technique [0002] At present, a kind of strain sensor called vibrating wire is widely used in engineering buildings, bridges, reservoir dams and other fields. The vibrating wire strain sensor has been widely used especially in the field of geotechnical engineering because of its simple structure and strong anti-interference ability. [0003] However, the vibrating wire strain sensor has also become a topic of widespread debate in the industry due to its obvious technical defects. For the vibrating wire strain sensor with the tensioned metal string as the sensitive element, when the length of the string is determined, the change of its natural vibration frequency can indicate the magnitude of the tension on the string. A certain relationship between forces. With the continuous in-depth ...

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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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