CN111174930A - Temperature sensor and temperature sensing system - Google Patents
Temperature sensor and temperature sensing system Download PDFInfo
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- CN111174930A CN111174930A CN202010108360.9A CN202010108360A CN111174930A CN 111174930 A CN111174930 A CN 111174930A CN 202010108360 A CN202010108360 A CN 202010108360A CN 111174930 A CN111174930 A CN 111174930A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/16—Special arrangements for conducting heat from the object to the sensitive element
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/003—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using pyroelectric elements
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- General Physics & Mathematics (AREA)
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Abstract
The embodiment of the invention provides a temperature sensor and a temperature sensing system. The temperature sensor includes: a touch layer comprising opposing first and second sides, the first side of the touch layer for sensing a temperature of an external environment or an external object; the sensing layer comprises a third face and a fourth face which are opposite, the third face of the sensing layer is in contact with the second face of the touch layer and used for receiving the temperature transmitted by the touch layer and generating an electric signal according to the temperature, and the fourth face of the sensing layer is fixed on the artificial limb. The effect of reducing the manufacturing cost of the sensor and lightening the sensor is achieved.
Description
Technical Field
The embodiment of the invention relates to the technical field of sensors, in particular to a temperature sensor and a temperature sensing system.
Background
Temperature detection is a common application of sensors, and is widely applied to industrial and commercial products. However, the temperature detection for the prosthetic hand at present lacks related technical research. Mainly because prosthetic hands can be used with relatively little integration space and have more stringent requirements on the size of the added sensors. The temperature sensor is added to the prosthetic hand, so that the prosthetic hand can be effectively protected, and alarm information is generated when the prosthetic hand contacts an overheated object. Moreover, a problem of high rejection rate of the current prosthetic hand is that a user cannot generate touch feedback when using the prosthetic hand, namely, the user does not have real contact feeling on an object, and temperature is basic physical information of the object.
Currently, temperature sensors are classified into the following types: thermistor sensors, infrared temperature sensors, thermocouple sensors, and the like. Taking an infrared temperature sensor as an example, the infrared temperature sensor analyzes the thermal radiation of an object by using an infrared detector. Objects of different temperatures emit different frequencies of thermal radiation.
However, the infrared temperature sensor has high manufacturing cost and a complicated structure.
Disclosure of Invention
Embodiments of the present invention provide a temperature sensor and a temperature sensing system, so as to achieve the effects of reducing the manufacturing cost of the sensor and lightening the sensor.
In a first aspect, an embodiment of the present invention provides a temperature sensor, including:
a touch layer comprising opposing first and second sides, the first side of the touch layer for sensing a temperature of an external environment or an external object;
the sensing layer comprises a third face and a fourth face which are opposite, the third face of the sensing layer is in contact with the second face of the touch layer and used for receiving the temperature transmitted by the touch layer and generating an electric signal according to the temperature, and the fourth face of the sensing layer is fixed on the artificial limb.
Optionally, the thickness of the sensing layer is 30-50 microns.
Optionally, the sensing layer is a polyvinylidene fluoride PVDF material.
Optionally, the sensing layer is a closed film including a plurality of holes.
Optionally, the touch layer is a heat conducting material.
Optionally, the heat conducting material is metal.
Optionally, the metal comprises one or more of gold, copper or aluminum.
In a second aspect, an embodiment of the present invention provides a temperature sensing system, including:
the temperature sensor provided by any embodiment of the present invention further includes:
the first end and the second end of the processing module are used for receiving electric signals generated by the sensing layer and determining the relative temperature difference between the artificial limb and the external environment according to the electric signals.
Optionally, the processing module is configured to determine a change slope of the electrical signal, so as to determine a relative temperature difference between the prosthesis and the external environment or the external object according to the change slope of the electrical signal.
Optionally, the method further includes:
and the feedback module is electrically connected with the processing module and used for prompting the human body wearing the artificial limb according to the relative temperature difference.
The temperature sensor comprises a touch layer, a first side and a second side, wherein the first side and the second side are opposite, and the first side of the touch layer is used for sensing the temperature of an external environment or an external object; the sensing layer, the sensing layer includes opposite third face and fourth face, the third face of sensing layer with the second face of touch layer contacts, is used for receiving the touch layer transmission the temperature, and according to the temperature produces the signal of telecommunication, the fourth face of sensing layer is fixed on the artificial limb, has solved the cost height of present sensor preparation, and the problem of complicated structure, has realized the cost of manufacture that reduces the sensor and with the lightweight effect of sensor.
Drawings
Fig. 1 is a schematic view of an application scenario of a temperature sensor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a temperature sensor according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a sensor layer formed by stacking a plurality of sensor sublayers in a thickness direction according to an embodiment of the invention;
fig. 4 is a schematic diagram of a sensing layer formed by splicing a plurality of sensing sublayers in a horizontal direction according to an embodiment of the present invention;
FIG. 5 is a schematic view of a prosthetic hand for touching an external object according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a temperature sensing system according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of another temperature sensing system according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Furthermore, the terms "first," "second," and the like may be used herein to describe various orientations, actions, steps, elements, or the like, but the orientations, actions, steps, or elements are not limited by these terms. These terms are only used to distinguish one direction, action, step or element from another direction, action, step or element. For example, a first face may be referred to as a second face, and similarly, a second face may be referred to as a first face, without departing from the scope of the present application. The first face and the second face are both faces, but they are not the same face. The terms "first", "second", etc. are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Example one
Referring to fig. 1, fig. 1 is a schematic view of an application scenario of a temperature sensor according to an embodiment of the present invention. As shown in fig. 1, the temperature sensor a according to the embodiment of the present invention is installed on the prosthesis 100, so that it can sense when the prosthesis 100 is used to contact the external environment or hold an external object by using the temperature sensor a installed on the prosthesis 100. Referring to fig. 2, fig. 2 is a schematic structural diagram of a temperature sensor according to an embodiment of the present invention. As shown in fig. 2, an embodiment of the present invention provides a temperature sensor including a touch layer 110 and a sensing layer 120. The temperature sensor of the present embodiment is used for being fixed on a prosthesis to detect the temperature of an external environment or an external object, wherein:
the touch layer 110 comprises a first side 111 and a second side 112 which are opposite, and the first side 111 of the touch layer 110 is used for sensing the temperature of an external environment or an external object;
the sensing layer 120 includes a third surface 121 and a fourth surface 122 opposite to each other, the third surface 121 of the sensing layer 120 is in contact with the second surface 112 of the touch layer 110 for receiving the temperature transmitted by the touch layer 110 and generating an electrical signal according to the temperature, and the fourth surface 122 of the sensing layer 120 is fixed on the prosthesis 130.
In particular, the sensing layer 120 may be a thin film of material having a pyroelectric effect. The pyroelectric effect refers to a charge release phenomenon that the polarization intensity changes with temperature, and macroscopically, the change of the temperature causes voltage to appear or current to be generated at two ends of a material. In one embodiment, the sensing layer 120 is preferably a polyvinylidene fluoride (PVDF) material. The PVDF material has the characteristic of small volume, is easy to integrate into a sensor, and reduces the volume of the temperature sensor. The PVDF material is PVDF meltable fluorocarbon resin for paint, which is formed by homopolymerization of vinylidene fluoride (VDF) with the purity of more than or equal to 99.99 percent. A paint film prepared by baking a fluorocarbon coating prepared from 70% of PVDF resin by processes such as spraying or roller coating has unsurpassed ultra-weather resistance and processability. In one embodiment, the sensing layer 120 has a thickness of 30-50 microns. In one embodiment, the sensing layer 120 is a closed film comprising a plurality of holes. Alternatively, referring to fig. 3, the sensing layer 120 may be formed by stacking a plurality of sensing sublayers 1201 in the thickness direction. Optionally, referring to fig. 4, the sensing layer 120 may also be formed by splicing a plurality of sensing sublayers 1201 in a horizontal direction perpendicular to the thickness direction, so as to increase the area of the sensing layer 120.
Specifically, the touch layer 110 is a thermally conductive material, and the touch layer 110 may be a thin film of thermally conductive material. The touch layer 110 may be a thin film having a fixed shape. Optionally, the contact layer has a thickness of 30-50 microns. In one embodiment, preferably, the thermally conductive material is a metal. Due to the fact that metal is high in thermal conductivity, when a high-temperature object is touched, the PVDF material can detect a high-temperature signal due to rapid temperature conduction. In addition, the PVDF material can be protected to a certain extent by the existence of the metal film. Optionally, the metal includes one or more of gold, copper or aluminum, and is not particularly limited herein. The PVDF material has a pyroelectric effect and a piezoelectric effect. When the prosthesis touches an object, the sensing layer 120 is also squeezed to some extent, and thus a part of the current is generated due to the piezoelectric effect. However, the current generated by the piezoelectric effect affects the accuracy of the temperature determination. When the touch layer 110 is made of metal, the touch layer has good heat conductivity, can accurately and quickly transfer the temperature of an external environment or an external object, and can reduce the judgment that the temperature is affected by the current generated by the piezoelectric effect.
In particular, the prosthesis may be a prosthetic hand, a prosthetic leg or a prosthesis of other parts, which is not limited herein. FIG. 5 is a schematic view of an embodiment of the present invention touching an external object with a prosthetic hand. As can be seen from fig. 5, the temperature sensor a of the present embodiment is installed in the prosthetic hand 101 at a position contacting with the water cup 200, for example, on a finger of the prosthetic hand 101, and referring to fig. 1, when the prosthetic hand is used to take the water cup 200, the first side 111 of the touch layer 110 of the temperature sensor a can contact with the water cup, so as to sense the temperature of the water cup. At this time, since the third surface 121 of the sensing layer 120 is in contact with the second surface 112 of the touch layer 110, the sensing layer 120 may receive the temperature of the cup 200 and generate an electrical signal according to the temperature of the cup, thereby determining whether feedback on the human body wearing the prosthesis is required.
According to the technical scheme of the embodiment of the invention, the temperature sensor comprises a touch layer, the touch layer comprises a first surface and a second surface which are opposite, and the first surface of the touch layer is used for sensing the temperature of an external environment or an external object; the sensing layer comprises a third face and a fourth face which are opposite, the third face of the sensing layer is in contact with the second face of the touch layer and used for receiving the temperature transmitted by the touch layer and generating an electric signal according to the temperature, and the fourth face of the sensing layer is fixed on the artificial limb. Because only touch layer and contact layer, the temperature sensor of this embodiment simple structure is effective, has reached the cost of manufacture who reduces the sensor and with the lightweight technological effect of sensor.
Example two
Fig. 6 is a schematic structural diagram of a temperature sensing system according to a second embodiment of the present invention. As shown in fig. 6, an embodiment of the present invention provides a temperature sensing system including a temperature sensor 20 and a processing module 30. The temperature sensing system of the embodiment is used for being fixed on a prosthesis to detect the temperature of the external environment or an external object. Wherein:
the temperature sensor 20 comprises a touch layer 210 and a sensing layer 220, wherein the touch layer 210 comprises a first side 211 and a second side 212 which are opposite, and the first side 211 of the touch layer 210 is used for sensing the temperature of an external environment or an external object;
the sensing layer 220 includes a third surface 221 and a fourth surface 222, the third surface 221 of the sensing layer 220 is in contact with the second surface 212 of the touch layer 210 for receiving the temperature transmitted by the touch layer 210 and generating an electrical signal according to the temperature, and the fourth surface 222 of the sensing layer 220 is fixed on the prosthesis.
The first end of the processing module 30 is electrically connected to the third surface 221 of the sensing layer 220, the second end of the processing module 30 is electrically connected to the fourth surface 222 of the sensing layer 220, and the first end and the second end of the processing module 30 are configured to receive an electrical signal generated by the sensing layer 220 and determine a relative temperature difference between the prosthesis and the external environment according to the electrical signal.
Specifically, when the temperature of the external environment or the external object is transmitted to the sensing layer 220 through the touch layer 210 due to the pyroelectric effect, a voltage or a current is formed on the third surface 221 and the fourth surface 222 of the sensing layer 220. The first end of the processing module 30 is connected to the third surface 221 of the sensing layer 220, and the second end of the processing module 30 is connected to the fourth surface 222 of the sensing layer 220, so that the voltage or current generated can determine the temperature difference between the object touched by the prosthesis and the external environment. Specifically, the temperature sensor 20 is exposed to air, and the temperature of the temperature sensor 20 is almost equal to the ambient temperature. When the artificial limb touches a high-temperature object, an electric signal is generated, and the magnitude of the relative temperature difference can be determined according to the magnitude of the electric signal. Alternatively, a positive metal sheet may be fixed to the third surface 221 of the sensing layer 220, a negative metal sheet may be fixed to the fourth surface 222 of the sensing layer 220, and the sensing layer 220 may be electrically connected to the processing module 30 through the positive metal sheet and the negative metal sheet.
In one embodiment, the processing module 30 is configured to determine a change slope of the electrical signal to determine a relative temperature difference between the prosthesis and the external environment or external object based on the change slope of the electrical signal.
Specifically, the peak value determination and the change slope determination are performed by the signal generated by the temperature sensor 20 due to the pyroelectric property. The approximate temperature of the contacting external object can be obtained. The basic principle is that if the temperature of the contact object is higher than that of the prosthetic hand, the peak value of the signal generated by the pyroelectric effect is larger, and the change slope of the signal rise is larger. If the temperature of the contact object is lower than that of the prosthetic hand, a negative value signal is generated, and the rest is the same.
Optionally, the sensing layer 220 is a PVDF material. Optionally, the processing module 30 may include a preprocessing unit and an analysis unit. The preprocessing unit is used for preprocessing the electric signals, and the analyzing unit is used for analyzing the preprocessed electric signals so as to determine the relative temperature difference between the artificial limb and the external environment. In particular, due to the high sensitivity of the PVDF temperature sensor 20, there is some high frequency noise and baseline drift during real-time monitoring. Therefore, the electric signal obtained by the temperature sensor 20 needs to be filtered and denoised, and the signal generated by the temperature change is in a lower frequency band (< 10Hz), so that the high-frequency interference noise can be filtered by the low-pass filter. In addition, baseline drift in the monitoring process can be filtered out in real time through median filtering.
Referring to fig. 7, fig. 7 is a schematic structural diagram of another temperature sensing system according to an embodiment of the present invention.
The temperature sensing system further comprises:
and the feedback module 40 is electrically connected with the processing module 30 and used for prompting the human body wearing the artificial limb according to the relative temperature difference.
Specifically, after determining the relative temperature difference according to the electrical signal, the processing module 30 sends the analysis result to the feedback module 40, and the feedback module 40 determines whether to prompt according to the analysis result. In the embodiment, when the relative temperature difference is larger than the temperature difference threshold value, the prompt is given to the human body wearing the artificial limb. Optionally, the indication may be performed when the temperature is too high, or may be performed when the temperature is too low, which is not limited herein. Specifically, the prompting mode may be a voice prompting mode, a thermal stimulation prompting mode, or an electrical stimulation prompting mode, and is not limited here. Preferably, the indication is by means of electrical stimulation. The realization structure of the electrical stimulation is small and easy to integrate. By generating weak current and concentrating a certain point to stimulate a user, the stimulation sense is obvious and no harm is caused. Optionally, multiple modes can be preset, corresponding to the relative temperature of the contact object. Such as extremely low temperature, normal temperature, high temperature, and extremely high temperature, and no response feedback mechanism is generated for these modes.
According to the technical scheme of the embodiment of the invention, the temperature sensing system comprises a temperature sensor and a processing module, wherein the temperature sensor comprises a touch layer, the touch layer comprises a first surface and a second surface which are opposite, and the first surface of the touch layer is used for sensing the temperature of an external environment or an external object; the sensing layer comprises a third surface and a fourth surface which are opposite, the third surface of the sensing layer is in contact with the second surface of the touch layer and is used for receiving the temperature transmitted by the touch layer and generating an electric signal according to the temperature, and the fourth surface of the sensing layer is fixed on the artificial limb; the first end of the processing module is electrically connected with the third surface of the sensing layer, the second end of the processing module is electrically connected with the fourth surface of the sensing layer, and the first end and the second end of the processing module are used for receiving electric signals generated by the sensing layer and determining the relative temperature difference between the artificial limb and the external environment according to the electric signals. Because only touch layer and contact layer, the temperature sensor of this embodiment simple structure is effective, has reached the cost of manufacture who reduces the sensor and with the lightweight technological effect of sensor.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A temperature sensor for use with a prosthetic limb, the temperature sensor comprising:
a touch layer comprising opposing first and second sides, the first side of the touch layer for sensing a temperature of an external environment or an external object;
the sensing layer comprises a third face and a fourth face which are opposite, the third face of the sensing layer is in contact with the second face of the touch layer and used for receiving the temperature transmitted by the touch layer and generating an electric signal according to the temperature, and the fourth face of the sensing layer is fixed on the artificial limb.
2. The temperature sensor of claim 1, wherein the sensing layer has a thickness of 30-50 microns.
3. The temperature sensor of claim 1, wherein the sensing layer is a polyvinylidene fluoride (PVDF) material.
4. The temperature sensor of claim 1, wherein the sensing layer is a closed film comprising a plurality of holes.
5. The temperature sensor of claim 3, wherein the touch layer is a thermally conductive material.
6. The temperature sensor of claim 5, wherein the thermally conductive material is a metal.
7. The temperature sensor of claim 6, wherein the metal comprises one or more of gold, copper, or aluminum.
8. A temperature sensing system comprising the temperature sensor according to any one of claims 1 to 7, further comprising:
the first end and the second end of the processing module are used for receiving electric signals generated by the sensing layer and determining the relative temperature difference between the artificial limb and the external environment according to the electric signals.
9. The temperature sensing system of claim 8, wherein the processing module is configured to determine a slope of change of the electrical signal to determine a relative temperature difference between the prosthesis and the external environment or external object based on the slope of change of the electrical signal.
10. The temperature sensing system of claim 8, further comprising:
and the feedback module is electrically connected with the processing module and used for prompting the human body wearing the artificial limb according to the relative temperature difference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010108360.9A CN111174930A (en) | 2020-02-21 | 2020-02-21 | Temperature sensor and temperature sensing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010108360.9A CN111174930A (en) | 2020-02-21 | 2020-02-21 | Temperature sensor and temperature sensing system |
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| Publication Number | Publication Date |
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| CN111174930A true CN111174930A (en) | 2020-05-19 |
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| CN202010108360.9A Pending CN111174930A (en) | 2020-02-21 | 2020-02-21 | Temperature sensor and temperature sensing system |
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| CN (1) | CN111174930A (en) |
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- 2020-02-21 CN CN202010108360.9A patent/CN111174930A/en active Pending
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