CN111855077B - Hand-held type thin film force-sensitive resistance sensor calibration device and method - Google Patents
Hand-held type thin film force-sensitive resistance sensor calibration device and method Download PDFInfo
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- CN111855077B CN111855077B CN202010689051.5A CN202010689051A CN111855077B CN 111855077 B CN111855077 B CN 111855077B CN 202010689051 A CN202010689051 A CN 202010689051A CN 111855077 B CN111855077 B CN 111855077B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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Abstract
A handheld thin film force-sensitive resistance sensor calibration device and method comprises: the clamp comprises a base and a cross beam rotationally connected with the base, wherein a clamping seat and a high-precision force sensor which are internally provided with a film force-sensitive resistance sensor to be detected are arranged between one end of the cross beam and one end of the base, and the other end of the cross beam is connected with the other end of the base through a knurled high-head screw to form a clamp type structure. The invention adopts a pincer type structure, is suitable for handheld operation, and can conveniently and efficiently calibrate the thin film force-sensitive resistance sensor. And the influence of the shearing force and the deflection on the calibration of the film force-sensitive resistance sensor can be explored by replacing the clamping seat.
Description
Technical Field
The invention relates to the technology in the field of sensor detection, in particular to a handheld thin film force-sensitive resistance sensor calibration device.
Background
In recent years, the thin film force sensitive resistance sensor is widely applied to the field of biomechanical measurement by virtue of the characteristics of small volume, light weight and good flexibility. The plantar pressure insole based on the thin film force-sensitive resistance sensor monitors gait data of a lower limb patient for a long time and has important significance for scientifically guiding the rehabilitation of the patient. In the long-term use process of the film force-sensitive resistance sensor, the film force-sensitive resistance sensor needs to be calibrated and maintained regularly to ensure the normal work of the film force-sensitive resistance sensor.
The calibration of the thin film force sensitive resistance sensor has the following two requirements: 1) the force generated by the calibration platform is fully and uniformly applied to the sensitive unit of the film force-sensitive resistance sensor, so that the shape of the force application surface of the calibration platform is consistent with that of the sensitive unit of the sensor, and the force application surface and the sensitive unit of the sensor are coaxial; 2) the film force-sensitive resistance sensor has viscoelastic properties, and the film force-sensitive resistance sensor needs to be fully unloaded and kept still for a period of time before loading, so that the structure of the calibration table is required to be suitable for repeated loading and unloading.
In the prior art, the scheme for calibrating the film force-sensitive resistance sensor is standard weight or gas and hydraulic loading. In the standard weight scheme, whether the weight is stacked upwards or suspended, the force application direction is difficult to ensure to be vertical to the sensitive unit of the film force-sensitive resistance sensor, and the sensitive unit is stressed unevenly to cause poor repeatability of the film force-sensitive resistance sensor. Although the gas and hydraulic calibration scheme can ensure the stress uniformity, the calibration efficiency is low due to the large equipment and the high difficulty in instrument operation.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a handheld thin-film force-sensitive resistance sensor calibration device and method. And the influence of the shearing force and the deflection on the calibration of the film force-sensitive resistance sensor can be explored by replacing the clamping seat.
The invention is realized by the following technical scheme:
the invention relates to a hand-held type film force sensitive resistance sensor calibration device, comprising: the clamp comprises a base and a cross beam rotationally connected with the base, wherein a clamping seat and a high-precision force sensor which are internally provided with a film force-sensitive resistance sensor to be detected are arranged between one end of the cross beam and one end of the base, and the other end of the cross beam is connected with the other end of the base through a knurled high-head screw to form a clamp type structure.
The rotary connection is realized through double-end studs and flange face locking nuts arranged in the middle parts of the base and the cross beam.
The clamping seat is connected with one end of the cross beam through a flange face locking nut and a countersunk screw, and the clamping seat specifically comprises: one end of the cross beam is provided with a groove, the upper part of the clamping seat is inserted into the groove and is fixed through a countersunk head screw and a flange face locking nut, and the upper part of the clamping seat rotates around the screw to adjust the force application direction of the clamping force.
The clamping seat is a vertical clamping seat, an inclined clamping seat or a curved surface clamping seat, and works under three different scenes of a vertical force calibration experiment, an experiment for researching the influence of shearing force on the calibration experiment and an experiment for researching the influence of deflection on the calibration experiment respectively, the lower surface of the clamping seat is in contact with the high-precision force sensor and is fixed through the stud, and the clamping seat and the high-precision force sensor are coaxial and do not have relative motion.
The clamping seat comprises an upper half platform, a lower half platform which is oppositely arranged and a film force-sensitive resistance sensor which is arranged between the upper half platform and the lower half platform.
The bottom surface of the upper half platform of the vertical clamping seat is provided with a ball head for avoiding the interference of transverse force.
The middle of the clamping seat is provided with two silica gel gaskets for covering the thin film force-sensitive resistor unit to be calibrated, the shape of the silica gel gaskets is matched with that of the thin film force-sensitive resistor unit, and the area of the silica gel gaskets is slightly larger than that of the thin film force-sensitive resistor unit.
The high-precision force sensor is fixedly connected with the base through a countersunk screw.
The high-precision force sensor comprises: the S-type resistance strain type high-precision force sensor has a comprehensive error smaller than one in thousandth.
The invention relates to a calibration method of the handheld thin film force-sensitive resistance sensor calibration device, which respectively adopts corresponding clamping seats aiming at the influence of vertical force, shearing force or deflection on calibration, and uniformly selects a plurality of points as calibration points in the measuring range of the thin film force-sensitive resistance sensor. And (3) after the calibration point is selected, tightening the knurled screw and observing the reading of the high-precision force sensor to ensure that the high-precision force sensor respectively keeps the calibration point on the opposite stress, recording the reading in sequence after the output resistance of the thin film force-sensitive resistance sensor is stable, and finally obtaining a linear calibration curve through least square fitting.
Technical effects
The invention integrally solves the technical problem of fast and efficient calibration of the film force-sensitive resistance sensor.
Compared with the prior art, the invention realizes calibration through a portable structural design without being limited by experimental places, is suitable for handheld operation through a clamp type structure, can carry out conventional vertical force calibration or explore the influence of shearing force and deflection on a calibration result through a replaceable clamping seat, and is favorable for ensuring that force is uniformly applied on the film force-sensitive resistance sensor through the design of the rotatable clamping seat.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is a right side view of the present invention;
FIG. 4 is a left side view of the present invention;
FIG. 5 is a schematic view of the vertical clamping base;
FIG. 6 is a schematic structural view of the inclined clamping seat;
FIG. 7 is a schematic structural view of a curved surface clamping seat;
in the figure: the device comprises a base 1, a cross beam 2, a knurled high-head screw 3, two stud bolts 4 and 5, flange face locking nuts 6-8, countersunk screws 9 and 10, a calibrated high-precision force sensor 11, a vertical clamping seat 12, an inclined clamping seat 13, a curved surface clamping seat 14, silica gel gaskets 15 and 16 and a thin film force sensitive resistance sensor 17.
Detailed Description
As shown in fig. 1, the present embodiment relates to a calibration apparatus for a portable thin film force-sensitive resistance sensor, which includes: the device comprises a base 1, a cross beam 2, a knurled high-head screw 3, two studs 4 and 5, three flange face locking nuts 6-8, two countersunk head screws 9 and 10, a calibrated high-precision force sensor 11, a vertical clamping seat 12, an inclined clamping seat 13, a curved surface clamping seat 14 and two silica gel gaskets 15 and 16.
The middle part of the beam 2 is connected with the base 1 through the stud bolts 4 and the flange surface locking nuts 6 and 7, so that the beam 2 rotates around the stud bolts 4.
One end of the cross beam 2 is connected with the knurled high-head screw 3 through self-locking threads, and the other end of the cross beam is connected with the upper half part of the vertical clamping seat 12, the inclined clamping seat 13 or the curved surface clamping seat 14 through the countersunk head screw 9 and the flange surface locking nut 8. During calibration, one end of the cross beam 2 is lifted by clockwise screwing the knurled high-head screw 3, so that the upper part and the lower part of the vertical clamping seat 12, the inclined clamping seat 13 or the curved-surface clamping seat 14 extrude the silica gel gaskets 15 and 16, and force required by calibration is applied to the film force-sensitive resistance sensor 17.
The lower half parts of the vertical clamping seat 12, the inclined clamping seat 13 or the curved surface clamping seat 14 are connected with the upper end of a calibrated high-precision force sensor 11 through a stud 5, and the lower end of the high-precision force sensor 11 is fixed with the base through a sunk screw 10. The upper half of the vertical clamping shoe 12, the inclined clamping shoe 13 or the curved clamping shoe 14 is calibrated such that its clamping force passes through the center of the thin film force sensitive resistance sensor 17 and is perpendicular to the high precision force sensor 11. The reading of the high-precision force sensor 11 is the total pressure to which the thin-film force-sensitive resistance sensor 17 is subjected.
The middle part of the beam 2 is connected with the base 1 through the stud bolts 4 and the flange surface locking nuts 6 and 7, so that the beam 2 rotates around the stud bolts 4, compared with the traditional vertical loading mode, the structure can reduce the equipment volume, and accords with the portable design concept,
The top of the vertical clamping seat 12 can rotate around the cross beam 2 to ensure that the clamping force transmitted from the cross beam is always vertical to a stress surface; a semi-circular ball head with the diameter of 3mm is arranged on a clamping contact surface of the clamping mechanism and used for eliminating the influence of shearing force.
The inclined clamping seat 13 has a clamping surface which forms an included angle of 10 degrees with the ground, and vertical force can be decomposed into two directions of being perpendicular to the inclined plane and along the inclined plane, so that the influence of shearing force on a calibration experiment can be researched.
The upper surface dome of the curved surface clamping seat 14 is concave, and the lower surface dome is convex, so that the test method can be used for researching the influence of deflection on a calibration result.
The embodiment relates to a calibration method of the device, which specifically comprises the following steps:
When the shear force factor in the calibration process is measured, the inclined clamping seat 13 is selected;
when the deflection factor in the calibration process is measured, namely the film force sensor 17 is placed on the curved dome through the curved clamping seat with the curved dome, the stress surface is not horizontal, so that the influence of deflection can be researched.
And 2, rotating counterclockwise to loosen the knurled screw 3 so that the upper part and the lower part of the vertical clamping seat 12 can be separated.
And 3, standing the thin film force sensitive resistance sensor (without applying load) for 2 minutes.
And 4, placing silica gel gaskets 15 and 16 between the vertical clamping seats 12, and placing a film force-sensitive resistance sensor between the silica gel gaskets 15 and 16.
And 5, adjusting the position of the upper half part of the vertical clamping seat 12 to enable the vertical clamping seat 12, the silica gel gaskets 15 and 16, the thin film force sensitive resistance sensor and the high-precision force sensor 11 to be coaxially aligned.
And 6, starting sensor calibration after the installation is finished, and uniformly selecting 10-15 points in the range of the sensor range as calibration points. After the calibration points are selected, the knurled screw 3 is screwed clockwise to observe the readings of the high-precision force sensor 11, so that the readings are respectively kept on the point pair stress, and after the output resistance of the film force-sensitive resistance sensor is stable (generally, 1 minute is needed), the readings are recorded in sequence.
And 7, obtaining a linear calibration curve through least square fitting.
The device calibration device is portable and small, and has low dependence on experimental environment; the clamp type structure is suitable for handheld operation, and the calibration efficiency is improved; the design of the clamping seat can be replaced, so that not only is the conventional vertical force calibration carried out, but also the influence of the shearing force and the deflection on the calibration result can be researched; the design of the rotatable clamping seat is beneficial to ensuring that force is uniformly applied to the film force-sensitive resistance sensor.
In conclusion, the device greatly improves the calibration efficiency, and usually, the calibration can be completed once in 20 minutes.
The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (8)
1. A hand-held type film force sensing resistance sensor calibration device which characterized in that includes: the clamp comprises a base and a cross beam rotationally connected with the base, wherein a clamping seat and a high-precision force sensor which are internally provided with a film force-sensitive resistance sensor to be detected are arranged between one end of the cross beam and one end of the base, and the other end of the cross beam is connected with the other end of the base through a knurled high-head screw to form a clamp structure;
the clamping seats are vertical clamping seats, inclined clamping seats or curved surface clamping seats and respectively work under three different scenes of a vertical force calibration experiment, an experiment for researching the influence of shearing force on the calibration experiment and an experiment for researching the influence of deflection on the calibration experiment;
the clamping seat is a replaceable clamping seat, the lower surface of the clamping seat is in contact with the high-precision force sensor and is fixed through the stud, and the clamping seat and the high-precision force sensor are coaxial and do not move relatively;
the clamping seat comprises an upper half platform, a lower half platform which is oppositely arranged and a film force-sensitive resistance sensor which is arranged between the upper half platform and the lower half platform;
the top of the vertical clamping seat rotates around the cross beam to ensure that the clamping force transmitted from the cross beam is always vertical to the stress surface; the bottom surface of the upper half platform of the vertical clamping seat is provided with a ball head for avoiding the interference of transverse force;
the clamping surface of the inclined clamping seat forms an included angle with the ground, and vertical force is decomposed into two directions perpendicular to the inclined surface and along the inclined surface so as to explore the influence of shearing force on a calibration experiment;
the upper surface dome of the curved surface clamping seat is concave, and the lower surface dome is convex, so that the influence of deflection on a calibration result is researched.
2. The apparatus as claimed in claim 1, wherein the rotational connection is achieved by studs and flange face lock nuts disposed at the middle of the base and the cross-beam.
3. The handheld thin-film force-sensitive resistance sensor calibration device as claimed in claim 1, wherein the clamping seat is connected with one end of the cross beam through a flange face locking nut and a countersunk screw, specifically: one end of the cross beam is provided with a groove, the upper part of the clamping seat is inserted into the groove and is fixed through a countersunk head screw and a flange face locking nut, and the upper part of the clamping seat rotates around the screw to adjust the force application direction of the clamping force.
4. The apparatus for calibrating a hand-held thin film force-sensitive resistor sensor according to claim 1, wherein two silicone gaskets are disposed between the clamping bases for covering the thin film force-sensitive resistor units to be calibrated.
5. The apparatus for calibrating a hand-held thin-film force-sensitive resistance sensor according to claim 4, wherein the shape of the silicone gasket matches the shape of the thin-film force-sensitive resistance unit and the area of the silicone gasket is slightly larger than the area of the thin-film force-sensitive resistance unit.
6. The apparatus for calibrating a hand-held thin-film force-sensitive resistance sensor as claimed in claim 1, wherein the high-precision force sensor is fixedly connected to the base by means of a countersunk screw.
7. The hand-held thin-film force-sensitive resistance sensor calibration device according to claim 1 or 6, wherein the high-precision force sensor is: the S-type resistance strain type high-precision force sensor has a comprehensive error smaller than one in thousandth.
8. A calibration method based on the handheld thin-film force-sensitive resistance sensor calibration device of any one of claims 1 to 7 is characterized in that corresponding clamping seats are respectively adopted for influences of vertical force, shearing force or deflection on calibration, and a plurality of points are uniformly selected as calibration points within the measuring range of the thin-film force-sensitive resistance sensor; and (3) after the calibration point is selected, tightening the knurled screw and observing the reading of the high-precision force sensor to ensure that the high-precision force sensor respectively keeps the calibration point on the opposite stress, recording the reading in sequence after the output resistance of the thin film force-sensitive resistance sensor is stable, and finally obtaining a linear calibration curve through least square fitting.
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| CN202010689051.5A CN111855077B (en) | 2020-07-17 | 2020-07-17 | Hand-held type thin film force-sensitive resistance sensor calibration device and method |
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| CN202010689051.5A CN111855077B (en) | 2020-07-17 | 2020-07-17 | Hand-held type thin film force-sensitive resistance sensor calibration device and method |
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| CN111855077B true CN111855077B (en) | 2021-05-25 |
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