This disclosure relates to pressure sensors.
Pressure sensors are used in a variety of devices in order to detect physical pressures and/or forces.
One or more aspects of the disclosure relates to a pressure sensing apparatus configured to prevent pressure detection for pressures not breaching a threshold. The pressure sensing apparatus may comprise a pressure sensor and a compressible spacer. The pressure sensor may be configured to provide a signal conveying information associated with a physical pressure applied to the pressure sensing apparatus. The signal may be provided responsive to a physical contact with the pressure sensor. In some implementations, physical contact may be facilitated with a sensor contact element included in the pressure sensing apparatus. The sensor contact element may be positioned to oppose the pressure sensor.
The compressible spacer may be configured to prevent the physical contact with the pressure sensor for pressures applied to the pressure sensing apparatus that fail to breach the threshold. The compressible spacer may be configured to allow the physical contact with the pressure sensor for pressures applied to the pressure sensing apparatus that breach the threshold such that only such pressures result in the signal being provided by the pressure sensor.
These and other features, and characteristics of the present technology, as well as the methods of operation and functions of the related elements of structure and the combination of parts and economies of manufacture, will become more apparent upon consideration of the following description and the appended claims with reference to the accompanying drawings, all of which form a part of this specification, wherein like reference numerals designate corresponding parts in the various figures. It is to be expressly understood, however, that the drawings are for the purpose of illustration and description only and are not intended as a definition of the limits of the invention. As used in the specification and in the claims, the singular form of “a”, “an”, and “the” include plural referents unless the context clearly dictates otherwise.
In
The pressure sensor 16 may be an electronic pressure sensor, a mechanical pressure sensor, and/or other type of pressure and/or force sensor. The pressure sensor 16 may employ a diaphragm, piston, bourdon tube, bellows, and/or other components. The pressure sensor 16 may be configured to generate output signals associated with strain, stress, and/or other force metric on the pressure sensor 16 as a function of an applied force over an area of the pressure sensor 16. The pressure sensor 16 may comprise one or more of a piezoresistive strain gauge, a capacitive strain sensor, an electromagnetic sensor, pieszoelectric sensor, an optical strain sensor, and/or other types of pressure and/or force sensors.
The signal conveyed by the pressure sensor 16 may be configured to facilitate a quantification of the pressure and/or force transmitted to and received by the pressure sensor 16. The output signals may be communicated to a computing platform (not shown) configured to determine, from the output signals, the applied force and/or pressure. For example, out signals provided by a strain gauge type pressure sensor may be used to determine the applied force and/or pressure based on the relationship of the measured strain and the applied force. By way of non-limiting illustration, a computing platform may include a desktop computer, a laptop, a smartphone, a cell phone, a handheld electronic device having one or more processors, and/or other type of computing platform.
Pressures applied to the pressure sensing apparatus 10 may be determined based on the quantification of the pressure or force transmitted to the pressure sensor 16 and the threshold. For example, pressures applied to the pressure sensing apparatus 10 may be determined based on a sum of the quantification of the pressure or force transmitted to the pressure sensor 16 and the threshold. By way of non-limiting illustration, a total force of ten pounds applied to the pressure sensing apparatus 10 may be determined based on a summation of a threshold pressure of four pounds and a force of six pounds detected by the pressure sensor 16.
The compressible spacer 14 may be positioned adjacent to the pressure sensor 16. The compressible spacer 14 may be configured to prevent the physical contact with the pressure sensor 16 for pressures applied to the pressure sensing apparatus 10 that fail to breach a threshold. The compressible spacer 14 may be being configured to allow the physical contact with the pressure sensor for pressures applied to the pressure sensing apparatus that breach the threshold such that only such pressures result in the signal being provided by the pressure sensor. For example, if the pressure threshold is twelve pounds and a force of only ten pounds is exerted on the pressure sensing apparatus 10, the pressure sensor 16 may not detect any pressure or force. However, if the pressure threshold is twelve pounds and a force of fourteen pounds is exerted on the pressure sensing apparatus 10, the exerted force may be detected.
In some implementations, the compressible spacer 14 may include an elastomeric material. Such an elastomeric material may be natural or synthetic. Examples of elastomeric materials may include one or more of polyisoprene, polybutadiene, chloropene, butyl rubber, styrene-butadiene, nitrile rubber, polyacrylic rubber, silicone rubber, fluorosilicone, fluoroelastomers, ethylene-vinyl acetate, and/or other elastomeric materials. In some implementations, the compressible spacer 14 may include other materials or compressible objects. For example, in some implementations, the compressible spacer 14 may comprise a spring made from metal and/or other material.
The threshold pressure and/or force may be determined based on the geometry of the compressible spacer 14, the material and material properties (e.g., durometer, elasticity, etc.) of the compressible spacer 14, and/or other feature or parameter of the pressure sensing apparatus 10. For example, the threshold pressure and/or force may be the pressure and/or force required to compress the compressible spacer 14 a predetermined distance.
Those skilled in the art will appreciate that by varying one or more of these parameters and/or other features of the pressure sensing apparatus 10 may facilitate changing and/or tuning the threshold pressure and/or force that must be overcome in order to facilitate physical contact with the pressure sensor 16. One or more aspects and/or features of the pressure sensing apparatus 10 will brought out in more detail in the descriptions and figures provided herein (e.g.,
The first support 18 may have a first surface 20 and a second surface 22. The second surface 22 may be opposite the first surface 18. The first support 18 may have a circumferential side edge 24 communicating between the first surface 20 and the second surface 22. The first support 18 may be substantially planar. The first support 18 may be substantially disc shaped. The first support 18 may be a rigid material. The first support 18 may be formed from plastic, metal, wood, and/or other material and/or materials suitable for the intended purpose(s) presented herein. The first support 18 may be disposed and arranged adjacent to a first side 35 of the compressible spacer 14. The first support 18 may coaxially align with the center line 44 of the pressure sensing apparatus 10.
The second support 26 may have a first surface 28 and a second surface 30. The second surface 30 may be opposite the first surface 28. The second support 26 may have a circumferential side edge 32 communicating between the first surface 28 and the second surface 30. The second support 26 may be substantially planar. The second support 8 may be disc shaped. The second support 26 may be a rigid material. The second support 26 may be formed from a plastic, metal, wood, and/or other material and/or materials suitable for the intended purpose(s) presented herein. The second support 26 may be disposed and arranged adjacent to a second side 37 of the compressible spacer 14 that is opposite the first side 35. The second support 26 may coaxially align with the center line 44 of the pressure sensing apparatus 10.
It is to be noted that the shape, dimensions, and/or materials of the first support 18 and second support 26 may be of the designers choice and should not be considered limited by the descriptions and depictions presented herein. For example, the first support 18 and second support 26 may be polygonal (or other shape), curved, convex, concave, and/or have other geometries, shapes, and/or forms.
The sensor contact element 12 may be attached to the first support 18. The sensor contact element 12 may be attached to the second surface 22 of the first support 18. The sensor contact element 12 may have an appreciable thickness as to project a distance from the second surface 22 of the first support 18 that is suitable for the intended purpose(s) presented herein (shown more clearly in the cross sectional views in
The sensor contact element 12 may comprise a rigid body. The sensor contact element 12 may have a shape and/or form that is similar to the first support 18 and/or second support 26 (e.g., disc shaped), and/or other shapes and/or forms. The sensor contact element 12 may be temporarily or permanently attached to the first support 18 using one or more of an adhesive, a mechanical fastener, a hook and loop fastener (e.g., Velcro®), a clip, a weld, and/or other approaches for temporary or permanent couplings. For example the sensor contact element 12 may have an adhesive backing (not shown) to facilitate temporary or permanent attachment.
In some implementations, the attachment of the sensor contact element 12 to the first support 18 may be permanent. In some implementations, the attachment of the sensor contact element 12 to the first support 18 may be removable. In some implementations, the sensor contact element 12 and the first support 18 may be integrated as a single object. For example the sensor contact element 12 may comprise a raised boss that is formed with, and projects from, the first support 18 (e.g., via machining, injection molding, and/or other by other techniques). In some implementations, the sensor contact element 12 may be omitted such that the first support 18 comprises the sensor contact element of the pressure sensing apparatus 10 (e.g., wherein the second surface 22 of the first support 18 may be configured to physically contact the pressure sensor 16).
The pressure sensor 16 may comprise a sensing area 36 and a wire lead 38 extending therefrom. The sensing area 36 may include components configured to generate output signals associated with an applied pressure on the sensor area 36. The wire lead 38 may be configured to communicate the electrical signals provided by the pressure sensor 16 to electronic storage, a computing platform, and/or other external device and/or location.
The pressure sensor 16 may be attached to the second support 26. The pressure sensor 16 may be attached to the first surface 28 of the second support 26. The pressure sensor 16 may be temporarily or permanently attached with the second support 26 using one or more of an adhesive, a mechanical fastener, a clip, a weld, and/or other approaches for temporary or permanent couplings. In some implementations, the pressure sensor 16 and the second support 26 may be integrated as a single object. The pressure sensor 14 may be disposed and arranged on the second support 26 such that the pressure sensor 14 is opposed to the sensor contact element 12. The pressure sensor 14 may coaxially align with the center line 44 of the pressure sensing apparatus 10.
In some implementations, the pressure sensor 16 may protrude from the first surface 28 of the second support 26 (e.g., as shown in
The compressible spacer 14 may have an annular shape. For example, the compressible spacer 14 may be a ring or ring shaped (e.g., such as an O-ring). The compressible spacer 14 may have a cross-section that is circular, polygonal, and/or other shape. The compressible spacer 14 may have a thickness, “D”. The compressible spacer 14 may encircle the pressure sensor 16 and/or sensor contact element 12 (e.g., shown more clearly in
The compressible spacer 14 may be positioned between the first support 18 and the second support 26. The first support 18 and second support 26 may be spaced apart at least a distance that is substantially equal to the thickness “D” of the compressible spacer 14 (shown more clearly in
A distance between the sensor contact element 12 and the pressure sensor 16 may define a gap, “G”. The threshold pressure and/or force on pressure sensing apparatus 10 that is required to be breached to facilitate contact of the sensor contact element 12 with the pressure sensor 16 may be the pressure or force required to compress the compressible spacer 14 a distance that is equal to the distance of the gap. Thus, this threshold may be predetermined based on one or more of the distance of gap “G”, the surface area of the surfaces of first support 18 and/or second support 26, the material, and/or material properties of compressible spacer 14, the geometry of compressible spacer 14, and/or one or more other variables.
In
The depth of the first cavity 42 may be a small fraction of the thickness “D” of the compressible spacer 14 such that when the pressure sensing apparatus 10 is assembled (as shown in
Returning to
It is noted that the shape and/or configuration of the first cavity 42 and/or second cavity 46 may be different depending on the shape and/or configuration of the compressible spacer 14 and/or pressure sensor 16, respectively, and is anticipated.
In an implementation of the kit 50, the pressure sensing apparatus 10 may employ removable attachment techniques for each of the sensor contact element 12, 12′, 12″, compressible spacer 14, 14′, 14″, and pressure sensor 16, 16′, 16″. For example, through use of removable adhesives and/or other removable attachment techniques, a user of the kit 50 may be able to selectively assembly the pressure sensing apparatus 10 to correspond to a specified threshold, and/or other specifications. In some implementations, the kit 50 may be accompanied by a reference chart (not shown) which may illustrate to a user what threshold pressure the pressure sensing apparatus 10 may correspond to depending on the selection of components from the kit 50. The kit 50 may contain more or less components than shown, and may include other components (e.g., a removable adhesive).
Although the present technology has been described in detail for the purpose of illustration based on what is currently considered to be the most practical and preferred implementations, it is to be understood that such detail is solely for that purpose and that the technology is not limited to the disclosed implementations, but, on the contrary, is intended to cover modifications and equivalent arrangements that are within the spirit and scope of the appended claims. For example, it is to be understood that the present technology contemplates that, to the extent possible, one or more features of any implementation can be combined with one or more features of any other implementation.