CN114791296A - Wide-range sensor and detection method - Google Patents
Wide-range sensor and detection method Download PDFInfo
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- CN114791296A CN114791296A CN202210510597.9A CN202210510597A CN114791296A CN 114791296 A CN114791296 A CN 114791296A CN 202210510597 A CN202210510597 A CN 202210510597A CN 114791296 A CN114791296 A CN 114791296A
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- 238000001514 detection method Methods 0.000 title claims abstract description 68
- 230000008093 supporting effect Effects 0.000 claims abstract description 46
- 238000005259 measurement Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 230000005484 gravity Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
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Abstract
The application relates to a wide-range sensor and a detection method. The wide range sensor includes: a support platform; the first sensor is used for measuring a detection signal of the supporting platform in a first measuring range; and the second sensor is used for switching to the second sensor to measure the detection signal of the supporting platform when the detection signal is in a second measuring range. The wide-range sensor and the detection method use the first sensor to detect the detection signal in a lower range, so that the detection result has higher precision; after the detection signal exceeds the range of the first sensor, the second sensor is switched to detect, so that the range of the sensor can be widened, and the whole sensor can have a wider range of the range under the condition of keeping a certain precision.
Description
Technical Field
The disclosure belongs to the field of sensors, and particularly relates to a wide-range sensor and a detection method.
Background
All existing sensors have limited measuring ranges (whether flexible substrates or hard substrates), and all measuring range requirements can not be achieved in the same sensing unit on the same sensing principle. In a specific application environment, it is a very difficult challenge to realize ultra-wide range measurement, such as 1mg-100kg (the accuracy of a full range exceeds one ten-thousandth), and to meet a certain sensitivity.
Disclosure of Invention
In view of the above, it is necessary to provide a wide-range sensor and a detection method having a wide range with a certain accuracy.
To this end, the present invention first provides a wide-range sensor comprising:
a support platform;
the first sensor is used for measuring a detection signal of the supporting platform in a first measuring range;
and the second sensor is used for switching to the second sensor to measure the detection signal of the supporting platform when the detection signal is in a second measuring range.
Preferably, the first sensor protrudes from the second sensor such that the support platform is in contact with the first and second sensors in sequence.
Preferably, the sensor further comprises an elastic member, and the elastic member is arranged below at least one of the first sensor and the second sensor.
Preferably, the elastic member includes a support layer having at least two coefficients of elasticity.
Preferably, the second sensor includes a cavity, and the first sensor is located in the cavity and protrudes from the second sensor.
Preferably, the elastic member is disposed in the cavity and located below the first sensor, and is configured to support the first sensor such that the first sensor protrudes from the second sensor.
Preferably, the maximum value of the first measuring range is smaller than or equal to the minimum value of the second measuring range, and the measurement accuracy of the first sensor is greater than the measurement accuracy of the second sensor.
In addition, the invention also provides a detection method of the wide-range sensor, which comprises the following steps:
when the stress of the supporting platform belongs to a first range of a first sensor, the first sensor measures a detection signal of the supporting platform;
and when the detection signal of the supporting platform belongs to a second range corresponding to the second sensor, switching the second sensor to measure the detection signal of the supporting platform.
Preferably, when the detection signal of the supporting platform belongs to the second measuring range corresponding to the second sensor, switching the second sensor to measure the detection signal of the supporting platform includes:
when the stress of the supporting platform is larger than or equal to a preset value, the first sensor is extruded and deformed by the supporting platform, so that the supporting platform is in contact with the second sensor and extrudes the second sensor.
Preferably, the pressing deformation of the first sensor by the support platform comprises:
the supporting platform compresses an elastic piece positioned below the first sensor through the first sensor;
and adjusting the detection signal of the supporting platform and the deformation amount of the first sensor through the elastic piece, and measuring the detection signal according to the deformation amount.
Compared with the prior art, the wide-range sensor and the detection method have the advantages that the first sensor is used for detecting the detection signal in a lower range, so that the detection result has higher precision; after the detection signal exceeds the range of the first sensor, the second sensor is switched to detect, so that the range of the sensor can be widened, and the whole sensor can have a wider range of the range under the condition of keeping a certain precision.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic diagram of the structure of a wide-range sensor.
Fig. 2 is a schematic configuration diagram of the wide-range sensor in a first sensor detection state.
Fig. 3 is a schematic structural diagram of the wide-range sensor switched to the second sensor detection state.
Description of the main elements
| Supporting |
10 |
| |
20 |
| Elastic piece | 30 |
| A first support layer | 31 |
| A second supporting |
32 |
| |
40 |
| Load(s) | 50 |
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a detailed description is given below in conjunction with the accompanying drawings and the detailed description. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, and the embodiments described are merely some, but not all embodiments of the present disclosure. All other embodiments obtained by one of ordinary skill in the art based on the disclosed embodiments without making any creative effort are also within the scope of the present disclosure.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
In various embodiments, the term "coupled" as used in the description and claims of the present application is not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect, for convenience of description and not limitation of the present disclosure. "upper", "lower", "below", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object to be described is changed, the relative positional relationships are changed accordingly.
Fig. 1 is a schematic diagram of the structure of a wide-range sensor. As shown in fig. 1, the wide range sensor includes a support platform 10, a first sensor 20, an elastic member 30, and a second sensor 40. The first sensor 20 and the second sensor 40 measure the detection signal through deformation generated by the pressing of the support platform 10. The wide-range sensor performs detection by the first sensor 20 when the detection signal is in the first-range (low-amplitude) measurement, and switches to the second sensor 40 to perform detection in the high-amplitude measurement, so that the total range of the sensor can be increased while maintaining high sensitivity.
Specifically, as shown in fig. 1, the support platform 10 has a substantially T-shaped longitudinal cross section, and includes a bearing surface and a connecting rod, wherein the bearing surface may be a horizontal surface as shown in fig. 1 for bearing a load 50 to be measured, such as an object to be measured. One end of the connecting rod is connected with the bearing surface, and the other end of the connecting rod extends along the vertical direction.
The first sensor 20 is used to measure the detection signal of the support platform 10 belonging to the first range of measurement, for example, the first range of measurement of the first sensor 20 may be a mass in a range of 1mg to 100 mg. The first sensor 20 may measure the mass of the load 50 or the force signal of the load 50 by the amount of deformation caused by the gravity compression of the load 50, or may detect electrical signals such as resistance and inductance, and may be applied to various detection signals depending on the material used for the first sensor 20. In a normal state, the first sensor 20 protrudes from the second sensor 40, so that the support platform 10 can first contact the first sensor 20 during the downward movement of the load 50, and the first sensor 20 is used to detect a detection signal of the load 50, which may be, for example, the mass or weight of the load 50.
The second sensor 40 is used for switching to the second sensor 40 to measure the detection signal of the support platform 10 when the detection signal is in the second measuring range. In some embodiments, the first sensor 20 and the second sensor 40 may be positioned differently such that the first sensor 20 and the second sensor 40 are positioned below the support platform 10 and the first sensor 20 is closer to the support platform 10 than the second sensor 40, such that the support platform 10 is in contact with the first sensor 20 and the second sensor 40 in sequence. In other embodiments, an open cavity may be disposed in the second sensor 40, the first sensor 20 is disposed in the open cavity, and the first sensor 20 protrudes from the open cavity of the open cavity to the side of the first sensor 20 close to the support platform 10. The second sensor 40 is of the same type as the first sensor 20, the maximum value of the measuring range of the first sensor 20 is less than or equal to the minimum value of the measuring range of the second sensor 40 when the first sensor 20 and the second sensor 40 are compared, and the measuring accuracy of the first sensor 20 is greater than the measuring accuracy of the second sensor 40.
Thus, when the load 50 of the support platform 10 is at a low amplitude (i.e., within the first range), the detection signal can be measured by the first sensor 20, thereby providing a high measurement accuracy. And when the load 50 of the support platform 10 is at a high amplitude (i.e. in the second range), the first sensor 20 is pressed by the support platform 10 into the cavity, the support platform 10 is brought into contact with the second sensor 40 and presses the second sensor 40, so that the detection signal can be measured by the second sensor 40.
The inventor finds that, in the process of implementing the above sensor, due to the fact that the sensor has nonlinearity, taking the first sensor 20 as an example, when the amplitude of the detection signal of the first sensor 20 is small, for example, as an example, the amplitude of the detection signal is in the first half of the first measurement range, the amplitude of the force signal output by the first sensor 20 is proportional to the displacement of the support platform 10 (i.e., the deformation amount of the first sensor 20), and obviously, this output mode is beneficial to outputting and debugging the detection signal, and the measurement accuracy is higher. However, in the second half of the first sensor 20, the amplitude of the output force signal may be in a nonlinear relationship with the displacement of the support platform 10, that is, there may be a deviation or a small amount of change in displacement, or the output force signal may be large, which results in a decrease in measurement accuracy and a difficulty in debugging the sensor.
For this purpose, in this embodiment, the sensor may further include an elastic member 30, the first sensor 20 and the elastic member 30 are located in the cavity, and the elastic member 30 is located below the first sensor 20 and supports the first sensor 20, so that the first sensor 20 protrudes from the second sensor 40.
The elastic member 30 is disposed below the first sensor 20 and is used for supporting the first sensor 20. In practice, the deformation amount of the first sensor 20 can be compensated by providing the elastic member 30 having an elastic coefficient corresponding to that of the first sensor 20 for adjusting the displacement of the support platform 10 during the detection. Those skilled in the art may perform a linear proportion of the force signal detected by the first sensor 20 to the displacement of the support platform 10 through limited experimentation or simulation. In other embodiments, a layer of elastic member 30 may be added below the second sensor 40 to support the second sensor 40 to compensate for the displacement of the second sensor 40.
In some embodiments, the elastic member 30 includes a support layer having at least two coefficients of elasticity. As shown in fig. 1, the elastic member 30 includes a first supporting layer 31 and a second supporting layer 32, and the first supporting layer 31 and the second supporting layer 32 are stacked and have different elastic coefficients and thicknesses, so that the overall elastic coefficient of the elastic member 30 can be adjusted, and the linearity of the support platform 10 measured by the first sensor 20 can be improved. Those skilled in the art will appreciate that the elastic member 30 may also include other numbers of support layers, such as three layers, four layers, etc.
A detection method of the wide range sensor implemented based on the above-described wide range sensor is described in detail below with reference to fig. 2 and 3, and includes the following steps. The following embodiments are described with the sensor measuring the gravity (or mass) as the detection signal of the load 50 as an example, but those skilled in the art can measure other types of detection signals of the load 50.
First, a load 50 is placed into the support platform 10. The weight of the load 50 will be described in a differentiated manner below.
Fig. 2 is a schematic configuration diagram of the wide-range sensor in a detection state of the first sensor 20. As shown in fig. 2:
1) if the weight of the load 50 is small, the force applied by the support platform 10 falls within the range of the first sensor 20. The first sensor 20 measures a detection signal of the support platform 10 under the support of the elastic member 30. At this time, the deformation of the elastic member 30 and the first sensor 20 is small (substantially negligible), the gravity of the load 50 can be detected by the first sensor 20, the displacement of the support platform 10 is substantially linear with the applied force, and the measurement accuracy and precision of the load 50 are high due to the good sensitivity and precision of the first sensor 20.
2) If the weight of the load 50 is greater, the force applied to the support platform 10 is still within the range of the first sensor 20 (e.g., in the second half of the first range). Since the deformation of the first sensor 20 is no longer linear with the applied force, in this situation, the detecting signal of the supporting platform 10 and the deformation of the first sensor 20 can be adjusted by the elastic member 30 and measured according to the deformation. That is, the deformation amount of the elastic member 30 can compensate the deformation amount of the first sensor 20, so that the displacement of the support platform 10 as a whole can still keep a linear relation with the force.
Fig. 3 is a schematic structural view of the wide-range sensor switched to the detection state of the second sensor 40. As shown in fig. 3:
3) if the weight of the load 50 is larger than the range of the first sensor 20, and the force applied to the supporting platform 10 is greater than or equal to the preset value, the second sensor 40 is switched to measure the detection signal of the supporting platform 10. In this step, when the stress on the supporting platform 10 is greater than or equal to the preset value, the first sensor 20 and the elastic element 30 are pressed and deformed by the supporting platform 10 and compressed into the cavity of the second sensor 40, so that the supporting platform 10 contacts with the second sensor 40 and presses the second sensor 40, and the weight of the supporting platform 10 is detected by the second sensor 40. Meanwhile, since the first sensor 20 is located in the cavity, the first sensor 20 can be prevented from being damaged due to overload. At this time, although the first sensor 20 still has a supporting effect on the support platform 10, the force applied by the first sensor 20 is small and can be ignored, or the measurement data of the second sensor 40 can be corrected according to the output data of the first sensor 20, so that the detection accuracy of the sensor can be improved.
In summary, the wide-range sensor and the detection method described above use the first sensor 20 to detect the detection signal in the lower range, so that the detection result has higher accuracy; after the detection signal exceeds the range of the first sensor 20, the second sensor 40 is switched to detect, so that the range of the sensor can be widened, and the whole sensor can have a wider range of the range under the condition of keeping a certain precision.
On the other hand, by arranging the elastic member 30 below the first sensor 20, the displacement of the supporting platform 10 can be compensated, so that the stress and the displacement of the supporting platform 10 are generally in a linear relationship, and the detection accuracy of the sensor is improved.
In the several embodiments provided, it should be understood that it will be apparent to those skilled in the art that the details of the above-described exemplary embodiments are not limited thereto, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. Furthermore, it will be obvious that the term "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. The terms first, second, etc. are used to denote names, but not any particular order.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the present invention.
Claims (10)
1. A wide-range sensor, comprising:
a support platform;
the first sensor is used for measuring a detection signal of the supporting platform in a first measuring range;
and the second sensor is used for switching to the second sensor to measure the detection signal of the supporting platform when the detection signal is in a second measuring range.
2. The wide-range sensor of claim 1, wherein the first sensor protrudes from the second sensor such that the support platform is in contact with the first and second sensors in sequence.
3. The wide-range sensor of claim 2, further comprising a resilient member disposed below at least one of the first sensor and the second sensor.
4. The wide-range sensor of claim 3, wherein the resilient member includes a support layer having at least two coefficients of elasticity.
5. The wide-range sensor of claim 3, wherein the second sensor includes a cavity, the first sensor being positioned within the cavity and protruding from the second sensor.
6. The wide-range sensor of claim 5, wherein the resilient member is disposed within the cavity and below the first sensor for supporting the first sensor such that the first sensor protrudes from the second sensor.
7. The wide-range sensor of claim 1, wherein a maximum value of the first range is less than or equal to a minimum value of the second range, and wherein a measurement accuracy of the first sensor is greater than a measurement accuracy of the second sensor.
8. A detection method of a wide-range sensor is characterized by comprising the following steps:
when the stress of the supporting platform belongs to a first range of a first sensor, the first sensor measures a detection signal of the supporting platform;
and when the detection signal of the supporting platform belongs to a second range corresponding to the second sensor, switching the second sensor to measure the detection signal of the supporting platform.
9. The method for detecting as claimed in claim 8, wherein switching the second sensor to measure the detection signal of the supporting platform when the detection signal of the supporting platform belongs to the second measurement range corresponding to the second sensor comprises:
when the stress of the supporting platform is larger than or equal to a preset value, the first sensor is extruded and deformed by the supporting platform, so that the supporting platform is in contact with the second sensor and extrudes the second sensor.
10. The method of claim 9, wherein the deforming the first sensor by the support platform comprises:
the supporting platform compresses an elastic piece positioned below the first sensor through the first sensor;
and adjusting the detection signal of the supporting platform and the deformation amount of the first sensor through the elastic piece, and measuring the detection signal according to the deformation amount.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210510597.9A CN114791296A (en) | 2022-05-11 | 2022-05-11 | Wide-range sensor and detection method |
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| CN202210510597.9A CN114791296A (en) | 2022-05-11 | 2022-05-11 | Wide-range sensor and detection method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85104807A (en) * | 1985-06-02 | 1986-08-06 | 哈尔滨工业大学 | Multi-range load cell |
| JP2000214002A (en) * | 1999-01-21 | 2000-08-04 | Fuji Univance Corp | Load sensor |
| DE20319029U1 (en) * | 2003-12-09 | 2004-03-04 | Kuhnke Gmbh | Force sensor has displacement sensor measuring movement of successively loaded springs |
| US9383270B1 (en) * | 2013-10-28 | 2016-07-05 | Sandia Corporation | Silicon force sensor |
| CN113008417A (en) * | 2021-02-22 | 2021-06-22 | 清华大学 | Flexible pressure sensor based on multi-stage structure, preparation method and measurement system |
-
2022
- 2022-05-11 CN CN202210510597.9A patent/CN114791296A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85104807A (en) * | 1985-06-02 | 1986-08-06 | 哈尔滨工业大学 | Multi-range load cell |
| JP2000214002A (en) * | 1999-01-21 | 2000-08-04 | Fuji Univance Corp | Load sensor |
| DE20319029U1 (en) * | 2003-12-09 | 2004-03-04 | Kuhnke Gmbh | Force sensor has displacement sensor measuring movement of successively loaded springs |
| US9383270B1 (en) * | 2013-10-28 | 2016-07-05 | Sandia Corporation | Silicon force sensor |
| CN113008417A (en) * | 2021-02-22 | 2021-06-22 | 清华大学 | Flexible pressure sensor based on multi-stage structure, preparation method and measurement system |
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