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Eddy current frequency modulation distance sensor

A distance sensor, eddy current technology, applied in the field of sensors, can solve the problem of increasing inductance of LC oscillation circuit, and achieve the effect of increasing sensitivity

Active Publication Date: 2020-09-08
中山市南博尔科技有限公司
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Problems solved by technology

It does not make sense to increase the sensitivity of the inductor based on this type of LC oscillator circuit

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  • Eddy current frequency modulation distance sensor
  • Eddy current frequency modulation distance sensor
  • Eddy current frequency modulation distance sensor

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[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0030] The key of eddy current frequency modulation ranging is the LC oscillator, which is related to the performance of the entire sensor. In order to increase the detection sensitivity, the shielding measures used on the inductance will produce a large amount of eddy current loss, coupled with the excessive frequency change, the known LC oscillator circuits are difficult to work normally, including the Crapeau LC oscill...

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Abstract

The invention discloses an eddy current frequency modulation type distance sensor. The sensor comprises three aspects of adopting an inductor used for detecting a distance: using special structures ofa shielding ring, a shielding cover and the like to increase the effective frequency change range of an LC oscillator from less than 10% to nearly 100% so that the influences of various drifts on a measurement result are effectively reduced; adopting an eddy current resistance loss LC oscillator: using an emitter electrode to inject energy to an LC resonance loop so that oscillation starting is easy to generate compared with a commonly-used carat wave LC oscillator, wherein an output amplitude can exceed a power supply voltage so that a signal to noise ratio is greatly increased, and an output impedance is low so that a digital circuit can be directly driven; and adopting a frequency and distance relation curve rectification method: using one rectification function to rectify a distance and frequency relation curve, wherein compared with a table look-up interpolation method, by using the method, a sampling point number is greatly reduced. In the method, only three points are needed, arectification effect is equal to that of a twenty-point table look-up interpolation method, a high accuracy degree is possessed when the range exceeds 2 measurement ranges and the table look-up method can not reach the accuracy degree.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to an eddy current frequency modulation distance sensor. Background technique [0002] Most of the existing eddy current frequency modulation distance sensors use Clapo LC oscillator to obtain the frequency modulation signal, and the curve correction adopts the method of look-up table and interpolation. The biggest problem of using the look-up table method to correct the curve is that there are too many sampling points and the operation is inconvenient. [0003] The limiting frequency variation range of the Clapo LC oscillator is 30%, beyond this limit, it will be difficult to start the oscillation. In actual design, the frequency variation range is generally around 10%. It does not make sense to increase the sensitivity of the inductor based on this type of LC oscillator circuit. Contents of the invention [0004] (1) Purpose of the invention [0005] The purpose of the prese...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/02
CPCG01B7/023
Inventor 李良
Owner 中山市南博尔科技有限公司
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