CN114264395A - Pressure detection device and method - Google Patents
Pressure detection device and method Download PDFInfo
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- CN114264395A CN114264395A CN202111450645.1A CN202111450645A CN114264395A CN 114264395 A CN114264395 A CN 114264395A CN 202111450645 A CN202111450645 A CN 202111450645A CN 114264395 A CN114264395 A CN 114264395A
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- 238000001514 detection method Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000003672 processing method Methods 0.000 claims description 3
- 238000005538 encapsulation Methods 0.000 claims description 2
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 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
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000005286 illumination Methods 0.000 description 1
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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 a pressure sensing medium and a light sensing sensor are sequentially arranged at the lower part of the light guide cone. The pressure detection device is simple in structure, not only can realize accurate detection of the magnitude of the pressure value, but also can realize detection of the pressure direction, and the detection is accurate and comprehensive.
Description
Technical Field
The invention relates to the field of machinery, in particular to a pressure detection device and method.
Background
The common methods for pressure detection include a gravity balance method, an elastic balance method, a mechanical force balance method and a physical property measurement method. At present, in the field of pressure sensing measurement micro devices, physical property measurement methods are mainly used for directly converting measured pressure into an electric signal for measurement. The existing pressure sensor and sensing device mainly have strain type, piezoelectric type and capacitance type, and the existing sensing modes mainly only can detect the pressure magnitude and can not detect the pressure direction, so that the existing pressure sensor and sensing device have certain limitations.
Therefore, those skilled in the art have made efforts to develop 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, an object of the present invention is to provide a pressure detecting device and method capable of detecting a pressure direction.
In order to achieve the 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 a pressure sensing medium and a light sensing sensor are sequentially arranged at the lower part of the light guide cone.
Preferably, a flexible pressure sensing shell is circumferentially arranged on the periphery of the pressure sensing medium.
Preferably, the middle part of the pressure sensing shell protrudes outwards.
Preferably, a supporting framework is arranged at the center in the pressure-sensitive medium.
Preferably, the light sensor and the bottom of the supporting framework are both arranged in the lower shell.
Preferably, the light source and the light guide cone are externally provided with an upper shell, and the light sensor is connected with a transmission lead.
Preferably, the pressure-sensitive medium is an elastic medium with light conductivity changed by pressure; the light-transmitting material can be specifically one of gel, modified elastic plastic, silica gel or liquid which can generate light-transmitting property change under pressure; and the upper end of the pressure-sensitive medium is provided with a transparent structural part for packaging.
Preferably, the light sensor is ring-shaped, and the light sensor 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 beams into the pressure-sensitive medium, and finally irradiating the light beams to the light-sensitive sensor to form uniform light spot projection;
2) the pressure sensitive medium is stressed to change the light spot and the light intensity, and the magnitude and the direction of the pressure are obtained through operation processing according to the change of the light spot and the light intensity.
Preferably, the light sensor is annular; the operation processing method in the step 2) is as follows:
21) defining an origin of the light sensor, setting the positive directions and the negative directions of an X axis and a Y axis and the positive directions and the negative directions of the X axis and the Y axis, and identifying each light sensing unit on the light sensor by using a coordinate;
22) collecting the light intensity received by each photosensitive unit, and calculating a 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 obtained, K0The initial light guide coefficient of the pressure-sensitive medium when the pressure value is 0, E0The initial intensity of light rays collected by the light sensor after passing through the pressure sensitive medium without external force, E1、E2、E3……EnThe intensity of light received by each photosensitive unit which generates intensity change after the pressure sensitive medium is subjected to pressure, and n is a non-0 natural number;
23) and determining the pressure direction according to the coordinate position of each photosensitive unit generating the intensity change.
The invention has the beneficial effects that: the pressure detection device is simple in structure, not only can realize accurate detection of the magnitude of the pressure value, but also can realize detection of the pressure direction, and the detection is accurate and comprehensive.
Drawings
FIG. 1 is a schematic longitudinal sectional view of an embodiment of the present invention.
FIG. 2 is a schematic diagram of a cross-sectional structure of an embodiment of the present invention.
Fig. 3 is a projection view of a light spot without pressure according to an embodiment of the present invention.
FIG. 4 is a schematic diagram of a longitudinal cross-sectional structure of an embodiment of the present invention when compressed.
Fig. 5 is a perspective view of a light spot under pressure in accordance with an embodiment of the present invention.
FIG. 6 is a schematic diagram of a surface light sensor array of a light sensor according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples, wherein the terms "upper", "lower", "left", "right", "inner", "outer", and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular manner, and thus should not be construed as limiting the present invention.
As shown in fig. 1 and 2, the pressure detection device includes a light source 1, a light guide cone 3 connected to a lower portion of the light source 1, and a pressure sensitive medium 7 and a light sensor 5 sequentially disposed on a lower portion 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 small-sized light emitter. 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-sensitive medium 7 and finally project the light beams to the light sensor 5. The light sensor 7 is integrated with an analog-to-digital conversion function, which receives the light signal transmitted from the pressure-sensitive medium 7 and converts the light signal into an electrical signal to be transmitted to the processor for processing.
The pressure-sensitive medium 7 is an elastic medium with light conductivity changed by pressure, and can be one of gel, modified elastic plastic, silica gel or liquid. The upper end of the pressure sensitive medium 7 is provided with a transparent structural member (not shown) for encapsulation, so that the transmission of light is not affected while the pressure sensitive medium is encapsulated. The periphery of the pressure sensing medium 7 is circumferentially provided with a flexible pressure sensing shell 4 which mainly plays a role in packaging and transmitting pressure to the internal pressure sensing medium 7, and in the practical example, the middle of the pressure sensing shell 4 protrudes outwards. The supporting framework 6 is arranged at the center in the pressure-sensitive medium 7 and is of a light-tight rigid structure, the light-sensitive sensor 5 and the middle of the pressure-sensitive medium 7 are arranged for supporting, and the whole body is prevented from deforming due to stress.
In the present application, the light sensor 5 is ring-shaped, and the light sensor array is distributed on the ring-shaped, so that a plurality of light sensing areas can be defined, and each light sensing area corresponds to one light sensing unit. As shown in fig. 3 and 5, the light sensor array may have a preset 0-degree array line 51, and according to the deformation of the pressure sensitive medium 7 caused by a force and the change of the light transmittance, the position angle of the light spot irradiated onto the light sensor changes relative to the 0-degree array line, and the light spot brightness is different for different pressures. According to the principle, the signals at the light sensor can be operated to obtain the pressure and the direction. 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 structures which protect the inside of the support.
A pressure detection method, which can be implemented by using the pressure detection device as described above, includes the following steps:
1) and the light beams are uniformly guided into the pressure-sensitive medium and finally emitted to the light-sensitive sensor, so that uniform light spot projection is generated. By adopting the pressure detection device, the light sensor is annular, the light source 1 is turned on, light is guided to the pressure sensing medium 7 through the light guide cone 3 and finally emitted to the light sensor 5, and under the condition of no pressure, the light intensity of the light emitted to the light sensor 5 is a relatively fixed value at each position and is annular, as shown in fig. 3.
2) The pressure-sensitive medium is stressed by the force F to change the light spots and the light intensity, and the magnitude and the direction of the pressure F are obtained through operation processing according to the change of the light spots and the light intensity. When the detection device is adopted, an 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 sensor through the pressure sensing medium is changed, and the light spot projection is also changed as shown in fig. 5.
The operation processing method in this step is as follows:
21) the origin of the light sensor is defined, the X axis and the Y axis are set, the positive directions and the negative directions of the X axis and the Y axis are defined, and each light sensing 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 array line position at 0 degree is set as the Y axis. The X axis is positive to the right and negative to the left; the Y-axis is positive upward and negative downward, as shown in fig. 6.
22) Collecting the light intensity received by each photosensitive unit, and calculating a pressure value according to the following formula:
F＝(∑{E0*K0/E1+E0*K0/E2+E0*K0/E3…+E0*K0/En})/n
whereinF is the force magnitude, i.e. the desired pressure value, i.e. the finally detected pressure value, K0The initial light guide coefficient of the pressure-sensitive medium at a pressure value of 0, i.e., the light guide coefficient of the pressure-sensitive medium when no pressure is applied to the pressure-sensitive medium 7, E0The initial intensity of light collected by the light sensor after passing through the pressure-sensitive medium without external force, i.e. the intensity of light emitted from the light source to the light sensor 5 through the sensing medium when the pressure-sensitive medium is not under pressure, E1、E2、E3……EnIs the light intensity received by each photosensitive unit 52 which generates intensity change after the pressure sensitive medium is pressed, and n is a non-0 natural number.
23) And determining the pressure direction according to the coordinate position of each photosensitive unit generating the intensity change. The pressure direction can be calculated by the coordinate position of the light spot (each photosensitive unit generating intensity change) because the pressure-sensitive medium is different in the stress direction and the position projected on the photosensitive sensor 5 is different. Specifically, a database can be established, a corresponding table is established according to 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 detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A pressure detection device is characterized in that: the light guide 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).
2. The pressure sensing device of claim 1, wherein: and a flexible pressure sensing shell (4) is arranged on the periphery of the pressure sensing medium (7) in the circumferential direction.
3. The pressure sensing device of claim 2, wherein: the middle part of the pressure sensing shell (4) protrudes outwards.
4. The pressure sensing device of claim 1, wherein: and a supporting framework (6) is arranged at the center in the pressure-sensitive medium (7).
5. The pressure sensing device of claim 4, wherein: the bottoms of the light sensor (5) and the supporting framework (6) are arranged in the lower shell (8).
6. The pressure sensing device of claim 1, wherein: the light source (1) and the light guide cone (3) are externally provided with an upper shell (2), and the light sensor (5) is connected with a transmission lead (9).
7. The pressure sensing device of claim 1, wherein: the pressure-sensitive medium (7) is an elastic medium with light conductivity changed by pressure; and the upper end of the pressure-sensitive medium (7) is provided with a transparent structural part for encapsulation.
8. The pressure sensing device of claim 7, wherein: the light sensor (5) is annular, and a light sensing array is distributed on the light sensor.
9. A pressure detection method is characterized by comprising the following steps:
1) uniformly guiding the light beams into the pressure-sensitive medium, and finally irradiating the light beams to the light-sensitive sensor to form uniform light spot projection;
2) the pressure sensitive medium is stressed to change the light spot and the light intensity, and the magnitude and the direction of the pressure are obtained through operation processing according to the change of the light spot and the light intensity.
10. The pressure detecting method according to claim 9, wherein: the light sensor is annular; the operation processing method in the step 2) is as follows:
21) defining an origin of the light sensor, setting the positive directions and the negative directions of an X axis and a Y axis and the positive directions and the negative directions of the X axis and the Y axis, and identifying each light sensing unit on the light sensor by using a coordinate;
22) collecting the light intensity received by each photosensitive unit, and calculating a 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 obtained, K0The initial light guide coefficient of the pressure-sensitive medium when the pressure value is 0, E0The initial intensity of light rays collected by the light sensor after passing through the pressure sensitive medium without external force, E1、E2、E3……EnThe intensity of light received by each photosensitive unit which generates intensity change after the pressure sensitive medium is subjected to pressure, and n is a non-0 natural number;
23) and determining the pressure direction according to the coordinate position of each photosensitive unit generating the intensity change.
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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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115262309A (en) * | 2022-09-01 | 2022-11-01 | 核工业华东建设工程集团有限公司 | Construction method for settlement-preventing highway subgrade in soft soil area |
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2021
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