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Non-contact composite capacitance electrode type displacement transducer and measurer

A technology of displacement sensor and composite electrode, which is applied in the direction of measuring devices, instruments, and electric devices, etc., which can solve the problems of measurement influence, measurement error, and inability to measure, and achieve the effects of improved stability, convenient use, and fast measurement speed

Inactive Publication Date: 2004-10-06
TIANJIN UNIV
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  • Application Information

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Problems solved by technology

First of all, when using the capacitance method for displacement measurement, the non-standard nature of the medium in the measurement environment will cause errors in the measurement, (that is, the measurement environment medium εr and the standard capacitance C of the instrument circuit b different medium); secondly, the change of the measurement environment medium will also bring errors to the measurement (that is, the random error of Δεr); in addition, the humidity of the air under the measurement conditions will seriously affect the measurement, and even the measurement cannot be carried out

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  • Non-contact composite capacitance electrode type displacement transducer and measurer
  • Non-contact composite capacitance electrode type displacement transducer and measurer
  • Non-contact composite capacitance electrode type displacement transducer and measurer

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Embodiment Construction

[0012] The basic working principle of the capacitive displacement sensor and its measuring instrument is that its voltage output V 0 = V b × C b ϵ 0 × ϵ r × S H . Where the environmental medium ε is measured r And vacuum dielectric constant ε 0 Both cause nonlinear errors to the measurement results; because the present invention uses a non-contact capacitive composite electrode displacement sensor and measuring instrument, the output voltage measured by the instrument is V 0 = 2 V b ...

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Abstract

The non-contact composite capacitance electrode type displacement transducer and measurer is especially suitable for measurement of displacement and thickness. The sensor consists of outer shielding electrode casing, measuring electrodes, composite electrodes. inner shielded electrode, circuit board and cable connector. There is also air valve joint to constitute air path together with sensor inner cavity and electrode interval. The circuit boards includes mainly thermosensitive element, pressure-sensitive element and humidify-sensitive element. The measurer includes standard signal generator circuit, negative feedback operation amplifier, monochip computer data processing and controlling circuit, and display circuit system. The present invention features that the measured displacement is related to the structural parameters of the instrument but the medium environment the measured object is in.

Description

Technical field [0001] The invention relates to a non-contact capacitive composite electrode type displacement sensor and a measuring instrument. It belongs to displacement sensor technology and measuring instrument technology, especially suitable for the measurement of displacement, thickness and vibration. technical background [0002] The general structure of the non-contact capacitive displacement sensor includes three parts: measuring electrode, inner shielding electrode, and outer shielding electrode. It forms a measuring capacitance C relative to the object to be measured, so there is C = ϵ 0 ϵ r × S H . Where: ε 0 Is the vacuum dielectric constant; ε r To measure the relative permittivity of the environment; S is the surface area of ​​the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/02G06F7/00
Inventor 樊玉铭张国雄
Owner TIANJIN UNIV
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