Capacitance sensing probe and precise spring shift-measurement instrument

Abstract

The invention discloses a capacitance sensing probe and a precise spring shift-measurement instrument. The capacitance sensing probe is composed of a variable parallel-plate capacitor, a capacitor moving plate locking mechanism, an electromagnetic shielding cover and a moving plate connecting part, wherein the capacitive sensing probe skillfully utilizes the variable parallel-plate capacitor and can realize detection to the micro displacement of a capacitor moving plate by combining a capacitance sensor circuit. The shift-measurement instrument enables a precise spring and the capacitance sensing probe to be combined, the micro change of the length of the precise spring is acquired through the measurement of the changes of the capacitance of the variable parallel-plate capacitor, and further the temperature drift or time drift coefficient of the precise spring to be detected can be calculated. The shift-measurement instrument skillfully utilizes the capacitance sensing probe, the temperature drift and time drift coefficients of the precise spring (similar device samples) to be detected can be rapidly and accurately measured successfully, and the shift-measurement instrument has very high measurement result precision higher than the measurement precision of all existing instruments for measuring the temperature drift and the time drift of the precise spring.

Description

technical field [0001] The invention relates to the technical field of material detection, in particular to a capacitive sensing probe and a precision spring drift detector, which are mainly used in fields that require the use of precision springs, or material tests that require accurate measurement of the dimensional change characteristics of materials, such as springs The gravimeter quickly selects precision springs to quickly measure the linear expansion coefficient of new material samples, the release of internal residual stress, creep rate and changes, etc. Background technique [0002] The drift coefficient of the length or elasticity of precision springs (or other precision devices) over time is often referred to as time drift, and the drift coefficient with temperature is often referred to as temperature drift. The time drift or temperature drift of a material directly or indirectly reflects the change law of its elastic modulus, shear modulus, creep rate and other p...

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Problems solved by technology

In order to evaluate and improve the process level and improve the development efficiency, it is necessary to quickly and accurately measure the temperature drift and time drift characteristics of precision springs made by different processes. These measurements also indirectly reflect the shear modulus temperature coefficient and linear expansion of the spring. Coefficient and creep, but there is no special instrument to measure the temperature drift and time drift effect of precision springs (or similar materials), especially the study of time drift effect involves the slow physical change process of the internal structure of the spring. Quantitative research remains a major challenge

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