A dual-frequency four-quadrant plane coordinate position detection method

Abstract

The invention belongs to the category of electrical methods, specifically a dual-frequency four-quadrant plane coordinate position detection method, which is characterized in that: a plurality of emitting electrodes are prepared on an insulating substrate, and a length-width ratio is consistent with the emitting electrodes on another insulating substrate , and the receiving electrode whose area is not larger than the transmitting electrode; fix the insulating substrate of the transmitting electrode on the reference object, fix the insulating substrate of the receiving electrode on the target object, and use two sinusoidal AC voltage signals with different frequencies, constant amplitude and phase, And get two out-of-phase signals through the inverting buffer respectively, use the analog adder to get four combined signals, and connect the combined signals to the transmitting electrodes located in the four quadrants of the reference object plane coordinate system respectively; the target object drives the receiving When the electrode is moving, the coordinate position of the target object in the reference object plane coordinate system can be detected by judging the amplitude and positive and negative phases of the two frequency components in the output voltage signal of the receiving electrode. The invention has high coordinate position detection precision and is easy to popularize and apply in high-precision automatic devices.

Description

technical field [0001] The invention belongs to the class of electrical methods, in particular to a dual-frequency four-quadrant plane coordinate position detection method. Background technique [0002] Position detection is the basis of modern industrial automation technology, and is widely used in mechanical processing equipment, automatic production lines, etc. The specific forms of position detection are mainly divided into categories such as straight line, plane and three-dimensional space. Whether in three-dimensional space or in a two-dimensional plane to detect the coordinate position of the target object, the current mainstream solution is realized by the orthogonal combination of linear position sensing elements, where the common types of linear position sensing elements include linear change differential transformers , linear resistance sensors, grating sensors, magnetic grid sensors and capacitance grid sensors. [0003] However, in the practice of constructing ...

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Problems solved by technology

[0003] However, in the practice of constructing plane and three-dimensional space position detection devices in an orthogonal manner, problems such as orthogonal assembly deviations, oversized dimensions after assembly, and complicated signal cable connections often occur, which not only affect the position detection accuracy but also limit the scope of application.

In order to realize integrated detection, the Chinese patent application with the publication number CN103308045A proposes a method of using micro-sensors to realize three-dimensional space position detection, but the accuracy is limited, and it is not suitable for precise and ultra-precision position detection; the Chinese patent application with the publication number CN102221323A proposes a planar The multi-degree-of-freedom variable capacitance position detection method of rectangular electrode array and multi-directional sensing electrode group, but the coupling relationship of capacitance change signals between different orientations is complicated, and it is difficult to realize engineering applications

In the field of precision position detection, various linear position sensing elements and their combination schemes are still dominant. At present, there is still a lack of plane coordinate position and three-dimensional space coordinate position detection methods that can provide high detection accuracy, simple scheme, and easy implementation.

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