Non-contact spatial position sensing device based on electret

Abstract

The invention discloses an electret-based non-contact spatial position sensing device, which is characterized in that an electret array unit comprises an electrode and an electret film attached to the surface of the electrode, and the electret array unit is fixed in a preset detection space; the motion unit comprises an electret medium and is fixedly connected with a movable object in the detection space; the potential signal collecting and processing unit comprises at least two collecting branches, and any electrode is electrically connected with the potential signal collecting and processing unit through the corresponding collecting branch; the high-voltage polarization unit is used for transmitting a pulse electric signal to the electret array unit so as to maintain the surface potential of the electret array unit. The change of an object in a space is detected by using the electret film and an electrostatic field formed between the electret films, and the characteristics of sensitive response and high precision are achieved. The electret material is low in cost, so that the detection device is low in manufacturing cost and can be widely applied. Meanwhile, the electret array unit is thin in size and can be randomly placed in a certain space, and the degree of freedom is high.

Description

technical field [0001] The invention relates to the technical field of distance sensors, in particular to an electret-based non-contact spatial position sensing device. Background technique [0002] Electret is a dielectric with a wide range of electrical storage functions. With the development of science and technology, it has gradually shown its potential as an important electronic material. It has applications in environmental purification, energy, electronic engineering, and biomedicine. important application. With the advancement of organic chemistry, more organic polymer materials with excellent performance have been synthesized by scientists, many of which have excellent electret properties. For example, PTFE (polytetrafluoroethylene) is a good electret material. [0003] Existing distance sensors usually include infrared sensors, laser distance sensors, ultrasonic sensors, etc., while infrared sensors can measure a relatively short distance with low precision. The...

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Problems solved by technology

[0003] The existing distance sensors usually include infrared sensors, laser distance sensors, ultrasonic sensors, etc., while infrared sensors can measure a relatively short distance with low precision, laser distance sensors have high cost, and the use environment is harsh, and ultrasonic sensors have high cost.

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