CN114264395B - Pressure detection device and method - Google Patents
Pressure detection device and method Download PDFInfo
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- CN114264395B CN114264395B CN202111450645.1A CN202111450645A CN114264395B CN 114264395 B CN114264395 B CN 114264395B CN 202111450645 A CN202111450645 A CN 202111450645A CN 114264395 B CN114264395 B CN 114264395B
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- 238000001514 detection method Methods 0.000 title claims abstract description 23
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- 238000012545 processing Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 239000000499 gel Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
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Abstract
The invention discloses a pressure detection device and a pressure detection method, wherein the pressure detection device comprises a light source, the lower part of the light source is connected with a light guide cone, and the lower part of the light guide cone is sequentially provided with a pressure sensing medium and a light sensing sensor. The invention has simple structure, can realize the accurate detection of the pressure value and the pressure direction, and has accurate and comprehensive detection.
Description
Technical Field
The invention relates to the field of machinery, in particular to a pressure detection device and a pressure detection method.
Background
The common methods for pressure detection are a gravity balance method, an elastic balance method, a mechanical force balance method and a physical property measurement method. In the field of pressure sensing measurement micro devices, a physical property measurement method is mainly used for directly converting measured pressure into an electric signal for measurement. The existing pressure sensor and sensing device mainly comprise strain type, piezoelectric type and capacitance type, and the existing sensing modes mainly only can detect the pressure, can not detect the pressure direction and have certain limitations.
Accordingly, those skilled in the art have been directed to developing a pressure detecting apparatus and method capable of detecting a pressure direction.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention is to provide a pressure detecting device and a method for detecting a pressure direction.
In order to achieve the above purpose, the invention provides a pressure detection device, which comprises a light source, wherein the lower part of the light source is connected with a light guide cone, and the lower part of the light guide cone is sequentially provided with a pressure sensing medium and a light sensing sensor.
Preferably, a flexible pressure sensing shell is arranged on the periphery of the pressure sensing medium in the circumferential direction.
Preferably, the middle part of the pressure sensing housing protrudes outwards.
Preferably, a supporting framework is arranged at the inner center of the pressure sensing medium.
Preferably, the light sensor and the bottom of the supporting framework are arranged in the lower shell.
Preferably, an upper shell is arranged outside the light source and the light guide cone, and the light sensor is connected with a transmission wire.
Preferably, the pressure sensing medium is an elastic medium with the light guide property changed by pressure; the material can be one of gel, modified elastic plastic, silica gel or liquid which can generate light transmittance change under pressure; and the upper end of the pressure sensing medium is provided with a transparent structural member package.
Preferably, the light sensor is ring-shaped, and a light sensing array is distributed on the light sensor.
The invention also provides a pressure detection method, which comprises the following steps:
1) Uniformly guiding the light beam into the pressure sensing medium, and finally shooting the light beam to the light sensing sensor to generate uniform light spot projection;
2) The pressure sensing medium is stressed to change the light spot and the light intensity, and the size and the direction of the pressure are obtained through operation processing according to the light spot and the light intensity change.
Preferably, the light sensor is annular; the operation processing method in the step 2) is as follows:
21 Defining an origin of a light sensor, and setting an X axis, a Y axis, an X axis and a Y axis positive direction and a Y axis negative direction, wherein each photosensitive unit on the light sensor can be identified by coordinates;
22 Collecting the light intensity received by each photosensitive unit, and calculating the pressure value according to the following formula:
F＝(∑{E0*K0/E1+E0*K0/E2+E0*K0/E3…+E0*K0/En})/n
wherein F is a required pressure value, K 0 is an initial light guide coefficient of the pressure sensing medium when the pressure value is 0, E 0 is initial intensity acquired by a light sensing sensor after light passes through the pressure sensing medium when no external force exists, E 1、E2、E3……En is light intensity received by each light sensing unit generating intensity change after the pressure sensing medium receives pressure, and n is a non-0 natural number;
23 A pressure direction is determined according to the coordinate position of each photosensitive unit generating intensity variation.
The beneficial effects of the invention are as follows: the invention has simple structure, can realize the accurate detection of the pressure value and the pressure direction, and has accurate and comprehensive detection.
Drawings
Fig. 1 is a schematic view of a longitudinal sectional structure of an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of an embodiment of the present invention.
Fig. 3 is a projection of a spot without pressure in accordance with an embodiment of the present invention.
Fig. 4 is a schematic view of a longitudinal cross-sectional structure of an embodiment of the present invention when pressed.
Fig. 5 is a projection view of a spot when pressed in accordance with an embodiment of the present invention.
FIG. 6 is a schematic diagram of a surface light-sensitive array of a light-sensitive sensor according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the drawings and examples, and it should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific manner, and thus should not be construed as limiting the present invention.
As shown in fig. 1 and 2, a pressure detection device comprises a light source 1, wherein the lower part of the light source 1 is connected with a light guide cone 3, and a pressure sensing medium 7 and a light sensing sensor 5 are sequentially arranged on the lower part of the light guide cone 3. The light source 1 may be an external light source introduced through an optical fiber, or may be a built-in compact light-emitting body. The light source 1 outputs an illumination signal for the light sensor 5. The light guide cone 3 is a medium with good light conduction, and can uniformly guide light beams into the pressure sensing medium 7 and finally to the light sensing sensor 5. The optical sensor 7 has integrated therein an analog-to-digital conversion function which receives an optical signal transmitted from the pressure sensing medium 7 and converts the optical signal into an electrical signal to be transmitted to a processor for processing.
The pressure sensitive medium 7 is an elastic medium whose light guiding property is changed by pressure, and can be one of gel, modified elastic plastic, silica gel or liquid. The upper end of the pressure sensing medium 7 is provided with a transparent structural member (not shown) for encapsulation, and the transmission of light is not influenced while the pressure sensing medium is encapsulated. The peripheral circumference of pressure sensing medium 7 is provided with flexible pressure sensing shell 4, mainly plays the effect of encapsulation and conduction pressure to inside pressure sensing medium 7, and in this practical example, the outside protrusion in pressure sensing shell 4 middle part. The center department is provided with braced skeleton 6 in the pressure sensing medium 7, is light tight rigid structure, installs light sensor 5, pressure sensing medium 7 middle part and is used for supporting, prevents that whole can be because of atress deformation.
In the present application, the light sensor 5 is ring-shaped, and light sensing arrays are distributed on the light sensor, so that a plurality of light sensing areas can be defined, and each light sensing area corresponds to a light sensing unit. As shown in fig. 3 and 5, the light sensing array may be preset with an array line 51 of 0 angle, and according to the deformation of the pressure sensing medium 7 caused by stress and the change of light transmittance, the position angle of the light spot irradiated onto the light sensing sensor will change relative to the array line of 0 angle, and meanwhile, the brightness of different light spots of the pressure will also be different. According to the principle, the pressure and the direction can be obtained by carrying out operation processing on the signals of the light sensor. The bottoms of the light sensor 5 and the supporting framework 6 are arranged in the lower shell 8. The light source 1 and the light guide cone 3 are externally provided with an upper shell 2, the light sensor 5 is connected with a transmission wire 9, and the light sensor signal is transmitted to an external processor. The upper shell 2 and the lower shell 8 are both of structures for protecting the inside of the support.
A pressure detection method, which can be implemented by using the pressure detection device as described above, comprising the steps of:
1) The light beam is uniformly guided into the pressure sensing medium and finally is emitted to the light sensing sensor, and uniform light spot projection appears. With the pressure detection device of the application, the light sensor is annular, the light source 1 is turned on, the light is guided to the pressure sensing medium 7 through the light guide cone 3, and finally the light is emitted to the light sensor 5, and the light intensity emitted to the light sensor 5 is a relatively fixed value everywhere under the condition of no pressure, and the shape is annular, as shown in fig. 3.
2) The pressure sensing medium is stressed by F to change the light spot and the light intensity, and the size and the direction of the pressure F are obtained through operation processing according to the light spot and the light intensity change. When the detection device is adopted, externally applied force is transmitted to the pressure sensing medium 7 through the flexible pressure sensing shell 4, even if the pressure sensing medium 7 is stressed, the stress of the pressure sensing medium 7 is deformed as shown in fig. 4, the light transmittance of the pressure sensing medium is changed, the light intensity emitted to the light sensing sensor through the pressure sensing medium is changed, and the light spot projection is also changed as shown in fig. 5.
The arithmetic processing method in this step is as follows:
21 Defining an origin of the light sensor, setting an X axis and a Y axis, and defining positive and negative directions of the X axis and the Y axis, wherein each photosensitive unit on the light sensor can be identified by coordinates. In this embodiment, the center of the light sensor 5 is set as the origin, and the 0-angle array line position is the Y axis. The X axis is positive to the right and negative to the left; the Y-axis is positive and the downward direction is negative, as shown in fig. 6.
22 Collecting the light intensity received by each photosensitive unit, and calculating the pressure value according to the following formula:
F＝(∑{E0*K0/E1+E0*K0/E2+E0*K0/E3…+E0*K0/En})/n
Wherein F is the force magnitude, i.e. the pressure value required, i.e. the pressure value finally detected, K 0 is the initial light guide coefficient of the pressure sensing medium when the pressure value is 0, i.e. the light guide coefficient of the pressure sensing medium when no pressure is applied to the pressure sensing medium 7, E 0 is the initial intensity of the light collected by the light sensing sensor after passing through the pressure sensing medium when no external force is applied, i.e. the intensity of the light source transmitted through the sensing medium to the light sensing sensor 5 when the pressure sensing medium is not pressed, E 1、E2、E3……En is the light intensity received by each light sensing unit 52 generating intensity change after the pressure sensing medium is pressed, and n is a natural number other than 0.
23 A pressure direction is determined according to the coordinate position of each photosensitive unit generating intensity variation. Because the pressure sensing medium is different in stress direction, the projection positions of the pressure sensing medium on the light sensor 5 are different, and the pressure direction can be calculated through the coordinate positions of light spots (each light sensing unit generating intensity change). Specifically, a database can be established, a corresponding table is established for the data relation between the coordinate position and the pressure direction, and the pressure direction can be obtained when the coordinate position of the light spot is known.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (3)
1. A pressure detection device, characterized by: the light source comprises a light source (1), wherein the lower part of the light source (1) is connected with a light guide cone (3), and the lower part of the light guide cone (3) is sequentially provided with a pressure sensing medium (7) and a light sensing sensor (5);
a flexible pressure sensing shell (4) is arranged on the periphery of the pressure sensing medium (7);
The middle part of the pressure sensing shell (4) protrudes outwards;
A supporting framework (6) is arranged at the inner center of the pressure sensing medium (7);
an upper shell (2) is arranged outside the light source (1) and the light guide cone (3), and the light sensor (5) is connected with a transmission wire (9);
The pressure sensing medium (7) is an elastic medium with the light guide performance changing under pressure; the upper end of the pressure sensing medium (7) is provided with a transparent structural member for packaging;
the light sensor (5) is annular, and a light sensing array is distributed on the light sensor.
2. The pressure detection apparatus according to claim 1, wherein: the bottoms of the light sensor (5) and the supporting framework (6) are arranged in the lower shell (8).
3. A pressure detection method of a pressure detection apparatus according to claim 1 or 2, comprising the steps of:
1) Uniformly guiding the light beam into the pressure sensing medium, and finally shooting the light beam to the light sensing sensor to generate uniform light spot projection;
2) The pressure sensing medium is stressed to change the light spot and the light intensity, and the size and the direction of the pressure are obtained through operation treatment according to the light spot and the light intensity change;
the operation processing method in the step 2) is as follows:
21 Defining an origin of a light sensor, and setting an X axis, a Y axis, an X axis and a Y axis positive direction and a Y axis negative direction, wherein each light sensing unit on the light sensor can be identified by coordinates;
22 Collecting the light intensity received by each photosensitive unit, and calculating the pressure value according to the following formula:
F＝(∑{E0*K0/E1+E0*K0/E2+E0*K0/E3…+E0*K0/En})/n
Wherein F is the pressure value, K 0 is the initial light guide coefficient of the pressure sensing medium when the pressure value is 0, E 0 is the initial intensity acquired by the light sensing sensor after the light passes through the pressure sensing medium when no external force exists, E 1、E2、E3……En is the light intensity received by each light sensing unit which generates intensity change after the pressure sensing medium receives pressure, n is the number of the light sensing units and is a non-0 natural number;
23 A pressure direction is determined according to the coordinate position of each photosensitive unit generating intensity variation.
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| CN202111450645.1A CN114264395B (en) | 2021-11-29 | 2021-11-29 | Pressure detection device and method |
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| CN202111450645.1A CN114264395B (en) | 2021-11-29 | 2021-11-29 | Pressure detection device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| MX360319B (en) * | 2014-09-30 | 2018-09-27 | Univ Autonoma Del Estado De Morelos | Optical pressure sensor and method for manufacturing the same. |
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