CN212409612U - High-sensitivity liquid metal strain sensor and intelligent device - Google Patents
High-sensitivity liquid metal strain sensor and intelligent device Download PDFInfo
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- CN212409612U CN212409612U CN202021301281.1U CN202021301281U CN212409612U CN 212409612 U CN212409612 U CN 212409612U CN 202021301281 U CN202021301281 U CN 202021301281U CN 212409612 U CN212409612 U CN 212409612U
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Abstract
The utility model provides a liquid metal strain sensor of high sensitivity, including strain sensor elasticity main part, make liquid metal strain sensor form the embedding body and the liquid metal of stress concentration, the liquid metal winding is in form strain sensor sensing main part on the embedding body, strain sensor sensing main part embedding is in the inside of strain sensor elasticity main part, the elastic modulus of the embedding body is greater than the elastic modulus of strain sensor elasticity main part. The utility model also provides an intelligent device. The utility model has the advantages that: the embedded body is adopted to lead the liquid metal strain sensor to form stress concentration, thereby generating the effect of extruding the liquid metal and reducing the cross section of the liquid metal, thereby improving the resistance change and the sensitivity.
Description
Technical Field
The utility model relates to a sensor especially relates to a liquid metal strain transducer and intelligent device of high sensitivity.
Background
At present, liquid metal strain sensors all adopt an injection method to inject liquid metal into a channel with a circular or square cross section, when the sensors are under tensile stress, the length of the channel is increased and the cross section is reduced, and according to a resistance formula
(R: resistance, rho: resistivity of material, l: length, s: cross-sectional area) shows that the resistance is increased, and the strain is sensed through the change of the resistance. The relationship between the resistance and the strain of the traditional straight channel liquid metal flexible strain sensor conforms to the formula: r ═ R0(1+ξ)2,R0Initial resistance, ξ: the sensor is strained.
Strain sensitivity Factor (Gauge Factor) of strain sensor:
the formula R is R0(1+ξ)2Substituting the formula to obtain the theoretical value GF (═ xi + 2) of the strain sensitivity factor of the liquid metal strain sensor. However, the average GF of the liquid metal strain sensor reported at present is about 0.5-3 when the strain is 100%, and the lower sensitivity makes the liquid metal strain sensor unable to detect smaller strain and puts higher requirements on signal extraction equipment, which greatly limits the application of the liquid metal strain sensor in the fields of wearable physiological signal detection and the like.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides a liquid metal strain transducer and intelligent device of high sensitivity.
The utility model provides a liquid metal strain sensor of high sensitivity, including strain sensor elasticity main part, make liquid metal strain sensor form the embedding body and the liquid metal of stress concentration, the liquid metal winding is in form strain sensor sensing main part on the embedding body, strain sensor sensing main part embedding is in the inside of strain sensor elasticity main part, the elastic modulus of the embedding body is greater than the elastic modulus of strain sensor elasticity main part, the both ends of liquid metal are connected with the wire respectively, the one end of wire with the liquid metal is connected, and the other end then stretches out outside the strain sensor elasticity main part.
As a further improvement, the two ends of the elastic main body of the strain sensor are laminated and connected with a strain elastic patch of the strain sensor which plays a role in strain redistribution.
As a further improvement of the utility model, strain sensor elastic main body is rectangular form object, and it is regional to divide into the middle part in the middle of along its length direction and the tip at both ends, the embedding body is located strain sensor elastic main body's middle part is regional, and sensor strain elastic paster then is located strain sensor elastic main body's tip is regional.
As a further improvement of the present invention, the elastic modulus of the sensor strain elastic patch is greater than the elastic modulus of the strain sensor elastic body.
As a further improvement of the present invention, the elastic modulus of the sensor strain elastic patch is equal to the elastic modulus of the embedded body.
As a further improvement of the present invention, the sensor strain elastic patch is attached to the strain sensor elastic body and cross-linked with the strain sensor elastic body.
As a further improvement of the present invention, the embedded body is a strip-shaped object, and the length direction of the embedded body is perpendicular to the length direction of the elastic main body of the strain sensor.
As a further improvement of the present invention, the length of the middle region of the elastic body of the strain sensor is smaller than the length of the end region of the elastic body of the strain sensor.
As the utility modelIn a novel further improvement, the elastic modulus of the elastic body of the strain sensor is between 1.05 and 104Pa to 9.85X 104Pa, the elastic modulus of the insert is between 1.15 x 106Pa to 6.35X 106Pa is between Pa.
The utility model also provides an intelligent device, include as above-mentioned any one the liquid metal strain transducer of high sensitivity.
As a further improvement, the intelligent device can be applied to intelligent robots, medical instruments, wearable intelligent devices, and the like.
The utility model has the advantages that: through the scheme, the embedded body is adopted to enable the liquid metal strain sensor to form stress concentration, so that the effect of extruding liquid metal is achieved, the cross section of the liquid metal is reduced, the resistance change of the liquid metal strain sensor can be improved, and the sensitivity is improved.
Drawings
Fig. 1 is a perspective view of a high sensitivity liquid metal strain sensor of the present invention.
Fig. 2 is a plan perspective view of a high sensitivity liquid metal strain sensor of the present invention.
FIG. 3 shows the high-sensitivity Δ R/R of the liquid metal strain sensor of the present invention0-Strain diagram.
FIG. 4 is a diagram of Δ R/R of a conventional liquid metal straight channel strain sensor0-Strain diagram.
Detailed Description
The present invention will be further described with reference to the following description and embodiments.
As shown in fig. 1 to 2, the present invention provides a high-sensitivity liquid metal strain sensor, which comprises a strain sensor elastic main body 1, an embedded body 2 for making the liquid metal strain sensor form stress concentration, and a fluid linear liquid metal 3, wherein the liquid metal 3 is wound on the embedded body 2 to form a strain sensor sensing main body, the strain sensor sensing main body is embedded inside the strain sensor elastic main body 1, the elastic modulus of the embedded body 2 is greater than that of the strain sensor elastic main body 1, when the sensor is stressed and elongated in the axial direction, the strain sensor elastic main body 1 contracts in the transverse direction, and the embedded body 2 does not deform significantly due to the greater elastic modulus, so as to prevent the strain sensor elastic main body 1 at the position from further contracting in the transverse direction, thereby generating the effect of extruding a liquid metal channel, the cross section of the channel is reduced, so that the resistance change of the channel can be improved, and the sensitivity is improved.
As shown in fig. 1 to 2, two ends of the liquid metal 3 are respectively connected with a wire 5, one end of the wire 5 is connected with the liquid metal, the other end of the wire 5 extends out of the elastic main body 1 of the strain sensor for electrically connecting with the outside, and the wire 5 is a copper wire.
As shown in fig. 1 to 2, in order to further improve the sensitivity, a sensor strain elastic patch 4 is designed, and the two ends of the strain sensor elastic main body 1 are connected with the sensor strain elastic patch 4 for strain redistribution.
As shown in fig. 1 to 2, the strain sensor elastic body 1 is an elongated object, and is divided into a middle region and end regions at both ends in a length direction thereof, the embedded body 2 is located in the middle region of the strain sensor elastic body 1, and the sensor strain elastic patches 4 are located in the end regions of the strain sensor elastic body 1.
As shown in fig. 1 to 2, the elastic modulus of the sensor strain elastic patch 4 is greater than the elastic modulus of the strain sensor elastic body 1.
As shown in fig. 1 to 2, the elastic modulus of the sensor strain elastic patch 4 is equal to the elastic modulus of the insert 2.
As shown in fig. 1 to 2, the sensor strain elastic patch 4 is attached to the strain sensor elastic body 1 and performs a cross-linking reaction with the strain sensor elastic body 1.
As shown in fig. 1 to 2, the insert body 2 is a long-sized body, and the longitudinal direction of the insert body 2 is perpendicular to the longitudinal direction of the strain sensor elastic body 1.
As shown in fig. 1 to 2, the length b of the middle region of the strain sensor elastic body 1 is smaller than the length a of the end regions of the strain sensor elastic body.
As shown in fig. 1 to 2, the elastic body 1 of the strain sensor is made of a material having an elastic modulus of 1.05 × 104Pa to 9.85X 104Pa, the embedded body 2 and the strain elastic patch 4 of the sensor are made of silica gel with elastic modulus of 1.15 multiplied by 106Pa to 6.35X 106Silica gel between Pa.
As shown in fig. 1 to 2, the strain elastic patch 4 of the sensor may be made of a silicone rubber having a large elastic modulus, the elastic body 1 of the strain sensor may be made of a rectangular parallelepiped, the poisson's ratio of the silicone rubber is about 0.45, and the embedded body 2 may be made of a rectangular parallelepiped.
As shown in fig. 1-2, when the sensor is stretched by a force, the end regions of the elastic body of the strain sensor can be strained only slightly due to the restraining action of the strain elastic patch 4 of the sensor. Suppose the total length of the strain sensor is l0Length b is lbThe sensor is subjected to an elongation Δ l and the strain is all concentrated in the central region of the elastic body l of the strain sensor, the total strain ∈ of the sensor1Is Deltal/l0Strain epsilon of the middle region of the elastic body l of the strain sensorbIs Deltal/lbSo thatb>εl。
On one hand, the structure improves the sensitivity of the liquid metal channel by extruding the embedded body 2 through stress concentration; on the other hand, the elastic patch 4 restricts the strain of the end part area of the elastic body, so that the strain is concentrated in the middle area, and the sensitivity of the sensor is further improved.
The utility model also provides an intelligent device, include as above-mentioned any one the liquid metal strain transducer of high sensitivity.
The intelligent device can be applied to intelligent robots, medical instruments, wearable intelligent devices and the like.
The liquid metal strain sensor is a flexible strain sensor.
The core of the utility model lies in: through the structural design of the liquid metal strain sensor, the stress/strain redistribution mechanism of the liquid metal strain sensor is changed to improve the strain sensitivity factor of the liquid metal strain sensor, so that the capability of the liquid metal strain sensor for detecting smaller strain is improved.
The utility model provides a pair of liquid metal strain transducer of high sensitivity through meeting an emergency/stress redistribution mechanism, makes to meet an emergency mainly concentrate on the 2 places regions in the embedding body, improves the ability of the 2 extrusion liquid metal 3 cross sections of embedding body, therefore increases substantially sensor sensitivity. The average GF at 100% strain of this sensor reached 110 (fig. 3), with about a 50-fold increase in sensitivity compared to a straight channel liquid metal strain sensor (fig. 4).
The utility model relates to a method for redistributing stress/strain to improve sensitivity through strain sensor structural design based on liquid metal liquid-solid conversion characteristic. The flexible strain sensor with high sensitivity has wide application prospect in the fields of human body/robot motion detection, medical instrument angle sensing and the like.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (8)
1. A high-sensitivity liquid metal strain sensor is characterized in that: including strain sensor elasticity main part, make liquid metal strain sensor form the embedding body and the liquid metal that stress concentration, the liquid metal winding form strain sensor sensing main part on the embedding body, strain sensor sensing main part embedding is in strain sensor elasticity main part's inside, the elastic modulus of embedding body is greater than strain sensor elasticity main part's elastic modulus, liquid metal's both ends are connected with the wire respectively, the one end of wire with liquid metal is connected, and the other end then stretches out outside the strain sensor elasticity main part.
2. The high sensitivity liquid metal strain sensor of claim 1, wherein: and two ends of the elastic main body of the strain sensor are connected with elastic sensor strain patches which have the function of strain redistribution.
3. The high sensitivity liquid metal strain sensor of claim 2, wherein: the elastic body of the strain sensor is a strip-shaped object and is divided into a middle area and end areas at two ends along the length direction of the elastic body of the strain sensor, the embedded body is positioned in the middle area of the elastic body of the strain sensor, and the elastic patch of the strain sensor is positioned in the end areas of the elastic body of the strain sensor.
4. The high sensitivity liquid metal strain sensor of claim 3, wherein: the elastic modulus of the sensor strain elastic patch is larger than that of the strain sensor elastic body.
5. The high sensitivity liquid metal strain sensor of claim 3, wherein: the elastic modulus of the sensor strain elastic patch is equal to the elastic modulus of the insert.
6. The high sensitivity liquid metal strain sensor of claim 3, wherein: the embedded body is a long strip-shaped object, and the length direction of the embedded body is perpendicular to the length direction of the elastic main body of the strain sensor.
7. The high sensitivity liquid metal strain sensor of claim 3, wherein: the length of the middle region of the strain sensor elastic body is less than the length of the end regions of the strain sensor elastic body.
8. An intelligent device, characterized in that: a liquid metal strain sensor comprising a high sensitivity as claimed in any of claims 1 to 7.
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| CN202021301281.1U CN212409612U (en) | 2020-07-06 | 2020-07-06 | High-sensitivity liquid metal strain sensor and intelligent device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370959A (en) * | 2021-12-17 | 2022-04-19 | 鹏城实验室 | Liquid metal flexible pressure touch and strain sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370959A (en) * | 2021-12-17 | 2022-04-19 | 鹏城实验室 | Liquid metal flexible pressure touch and strain sensor |
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