Sensor for pressure measurements
A sensor for pressure measurement may include a fabric support, an electrically conductive structure including tracks on the fabric support having resistance variations in response to deformations thereof, and a processor coupled to the electrically conductive structure and configured to sense resistance values of respective tracks of the electrically conductive structure and to provide a signal representative of a pressure difference across opposite faces of the fabric support.
1. A sensor for pressure measurement comprising:
a fabric support;
at least one electrically conductive structure comprising a plurality of tracks on said fabric support having resistance variations in response to deformations thereof; and
a processor coupled to said at least one electrically conductive structure and configured to sense resistance values of respective tracks of said at least one electrically conductive structure to provide a signal representative of a pressure difference across opposite faces of said fabric support.
2. The sensor according to claim 1 wherein said plurality of tracks comprises a reference track extending in a first direction, and a plurality of sense tracks extending from said reference track in a comb-like pattern in a second direction.
3. The sensor according to claim 2 wherein said processor comprises a plurality of terminals; wherein each sense track has an end coupled to a respective terminal of said processor; and further comprising a plurality of connection lines coupling the ends of said plurality of sense tracks to said plurality of terminals.
4. The sensor according to claim 1 wherein said plurality of tracks comprises:
a plurality of connection tracks defining a plurality of terminals; and
a plurality of sense tracks configured to, with the pressure difference across the opposite faces of said fabric support in an operation interval, cause, between said plurality of terminals respective resistance variations falling in respective distinct and non-overlapping intervals.
5. The sensor according to claim 4 wherein said plurality of tracks comprises a resistive ladder network.
6. The sensor according to claim 4 wherein each sense track has opposite ends respectively coupled to said plurality of connection tracks; and wherein said plurality of sense tracks is arranged at respective locations in a first direction.
7. The sensor according to claim 6 wherein said at least one electrically conductive structure comprises a plurality thereof aligned along a second direction transverse to the first direction.
8. The sensor according to claim 1 wherein said fabric support comprises a plurality of warp yarns, and a plurality of weave yarns woven of dielectric material to form a mesh structure.
9. The sensor according to claim 8 wherein said fabric support has a same longitudinal elastic modulus in a warp direction and in a weave direction.
10. The sensor according to claim 9 wherein said plurality of warp yarns and said plurality of weave yarns have equal density.
11. The sensor according to claim 8 wherein said fabric support has a longitudinal elastic modulus in a warp direction different from a longitudinal elastic modulus in a weave direction.
12. The sensor according to claim 11 wherein said plurality of warp yarns and said plurality of weave yarns have different densities.
13. The sensor according to claim 11 wherein said plurality of warp yarns and said plurality of weave yarns comprise different materials.
14. The sensor according to claim 11 wherein each warp yarn has a different diameter with respect to each of said plurality of weave yarns.
15. The sensor according to claim 8 further comprising a layer of elastomeric material; and wherein said fabric support is embedded in said layer of elastomeric material.
16. The sensor according to claim 1 wherein said fabric support is permeable to fluids.
17. The sensor according to claim 1 wherein said processor comprises a processing module and a multiplexer configured to sequentially couple said plurality of tracks to said processing module.
18. A sensor for pressure measurement comprising:
a fabric support;
a plurality of electrically conductive tracks on said fabric support having resistance variations in response to deformations thereof; and
a processor coupled to said plurality of electrically conductive tracks and configured to sense resistance values of respective electrically conductive tracks of said plurality thereof to provide a signal representative of a pressure difference across opposite faces of said fabric support.
19. The sensor according to claim 18 wherein said plurality of electrically conductive tracks comprises a reference track extending in a first direction, and a plurality of sense tracks extending from said reference track in a comb-like pattern in a second direction.
20. The sensor according to claim 19 wherein said processor comprises a plurality of terminals; wherein each sense track has an end coupled to a respective terminal of said processor; and further comprising a plurality of connection lines coupling the ends of said plurality of sense tracks to said plurality of terminals.
21. The sensor according to claim 18 wherein said plurality of electrically conductive tracks comprises:
a plurality of connection tracks defining a plurality of terminals; and
a plurality of sense tracks configured to, with the pressure difference across the opposite faces of said fabric support in an operation interval, cause, between said plurality of terminals respective resistance variations falling in respective distinct and non-overlapping intervals.
22. The sensor according to claim 21 wherein said plurality of electrically conductive tracks defines a resistive ladder network.
23. A method for making a sensor for pressure measurement, the method comprising:
forming a plurality of electrically conductive tracks on a fabric support and having resistance variations in response to deformations thereof; and
coupling a processor to the plurality of electrically conductive tracks to sense resistance values of respective electrically conductive tracks of the plurality thereof to provide a signal representative of a pressure difference across opposite faces of the fabric support.
24. The method according to claim 23 wherein the plurality of electrically conductive tracks comprises a reference track extending in a first direction, and a plurality of sense tracks extending from the reference track in a comb-like pattern in a second direction.
25. The method according to claim 24 wherein the processor comprises a plurality of terminals; wherein each sense track has an end coupled to a respective terminal of the processor; and further comprising a plurality of connection lines coupling the ends of the plurality of sense tracks to the plurality of terminals.
26. The method according to claim 23 wherein the plurality of electrically conductive tracks comprises:
a plurality of connection tracks defining a plurality of terminals; and
a plurality of sense tracks to, with the pressure difference across the opposite faces of the fabric support in an operation interval, cause, between the plurality of terminals respective resistance variations falling in respective distinct and non-overlapping intervals.
27. The method according to claim 26 wherein the plurality of electrically conductive tracks define a resistive ladder network.
28. The method according to claim 26 wherein each sense track has opposite ends respectively coupled to the plurality of connection tracks; and wherein the plurality of sense tracks is arranged at respective locations in a first direction.
29. The method according to claim 23 wherein the fabric support comprises a plurality of warp yarns, and a plurality of weave yarns woven of dielectric material to form a mesh structure.