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A flexible and conformable composite proximity sensor capable of detecting objects of a full range of materials and its application

A proximity sensor and composite technology, applied in the field of sensing, can solve the problems of restricting applications, restricting the application of wearable electronic devices, and being unable to detect charged insulating objects, etc., and achieve the effect of simple structure

Active Publication Date: 2022-03-22
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among traditional proximity sensors such as magnetic induction, infrared, ultrasonic, capacitive, organic semiconductor, etc., proximity sensors such as magnetic induction, infrared, ultrasonic, etc. are bulky and inflexible, which limits their application in wearable electronic devices
According to current reports, capacitive proximity sensors can only detect the proximity of conductive objects, and cannot detect the proximity of charged insulating objects; organic semiconductor proximity sensors can only detect the proximity of charged objects, and cannot detect the proximity of metal conductors, which is severely limited. The application of two proximity sensors in daily life

Method used

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  • A flexible and conformable composite proximity sensor capable of detecting objects of a full range of materials and its application
  • A flexible and conformable composite proximity sensor capable of detecting objects of a full range of materials and its application
  • A flexible and conformable composite proximity sensor capable of detecting objects of a full range of materials and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1. Preparation of a flexible and bondable composite proximity sensor with rubrene single crystal and fringe electric field as the sensitive layer

[0046] 1. Put the silicon wafer (thickness 430 μm) into acetone for 10 minutes, take it out and blow it dry with nitrogen, then put it in anhydrous ethanol for 10 minutes, blow it dry with nitrogen, then use deionized water for 10 minutes, and finally blow it with nitrogen Dry.

[0047]2. The silicon substrate is modified with OTS so that the PDMS can be peeled off, and the silicon wafer is placed in an OTS solution (OTS: n-heptane = 1:1000) for 3 hours.

[0048] 3. The upper and lower electrodes of the capacitive proximity sensor in the composite sensor are vapor-deposited on the OTS-modified silicon wafer, and the upper electrode is also used as a part of the electrode of the organic semiconductor proximity sensor (two upper electrodes are set opposite to each other); the evaporation electrode is gold , the condit...

Embodiment 2

[0055] Embodiment 2, composite proximity sensor real-time testing finger proximity stimulation

[0056] The device prepared in Example 1 was attached to the prosthesis for testing.

[0057] The distance between human fingers approaching the composite proximity sensor is about 2cm, and the influence on the electrical signal of the device when the finger approaches and moves away is tested in real time. Figure 4 (a) and Figure 4 (b) Respectively represent the photo graph and the graph of the change of the electrical signal with the distance between the human finger and the device during the test. Depend on Figure 4 (b) It can be found that as the human finger approaches and moves away, the current signal and the capacitance signal in the composite proximity sensor will change. This result shows that the composite proximity sensor prepared by the present invention can effectively detect the proximity of the finger Condition.

Embodiment 3

[0058] Embodiment 3, the composite proximity sensor tests the proximity stimulus of the gold ring in real time

[0059] The device prepared in Example 1 was attached to the prosthesis for testing. Use metal tweezers to clamp the gold ring close to the composite proximity sensor at a distance of about 2cm, and test the influence of the approach and distance of the gold ring on the electrical signal of the device in real time. Figure 5 (a) and Figure 5 (b) Respectively represent the photo graph and the graph of the change of the electrical signal with the distance between the human finger and the device during the test. Depend on Figure 5 (b) It can be found that as the gold ring approaches and moves away, the capacitive signal in the composite proximity sensor will change, but the current signal will not change. This result shows that the composite proximity sensor prepared by the present invention can effectively detect Close up of a gold ring.

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Abstract

The invention discloses a flexible and fitable composite proximity sensor capable of detecting objects in a full range of materials and its application. The composite proximity sensor includes a supporting layer and a dielectric layer that are attached together; the supporting layer is provided with an embedded electrode I, and the embedded electrode I is attached to the dielectric layer; the dielectric layer is provided with two oppositely arranged embedded electrodes II The surface of the dielectric layer is provided with an organic semiconductor single crystal between two embedded electrodes II; an embedded electrode II and an embedded electrode I are cross-fitted. The invention realizes the proximity detection of human fingers, gold rings and charged plastic rings by combining the capacitive proximity sensor with the organic semiconductor proximity sensor. The composite sensor also has the advantages of flexibility, fit, and simple structure, and can detect the proximity of objects of various materials, making it an important potential application in intelligent prosthetics, robots, and future human-computer interaction.

Description

technical field [0001] The invention relates to a flexible and adherable composite proximity sensor capable of detecting material objects in a full range and an application thereof, which belongs to the field of sensing technology. Background technique [0002] A proximity sensor is a sensor that can detect the presence of an object without touching it. This type of sensor can prevent accidental collisions. Proximity sensors can be applied to robots or prosthetics to keep a safe distance between the robot and obstacles. When the robot approaches an external object, the proximity sensor can help the robot sense the existence of the object, so that the robot can take evasive actions in advance to avoid accidents. [0003] Recently, spurred by developments in wearable electronics and artificial intelligence, there has been growing interest in miniaturizable and flexible devices. Among traditional proximity sensors such as magnetic induction, infrared, ultrasonic, capacitive, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/08
CPCG01V3/08
Inventor 汤庆鑫童艳红刘益春赵磊
Owner NORTHEAST NORMAL UNIVERSITY