Creep/deformation compensation for sensors
A sensor device comprising at least one sensor element and a sealed fluid cell having a compensation portion and a measurement portion coupled to the at least one sensor element. The sensor device is configured such that the compensation and measurement portions deform in response to externally applied fluid pressure to thereby change internal pressure conditions inside the sealed fluid cell and cause the measurement portion to experience differential pressure conditions of corresponding to the external and internal pressures.
1 . A sensor device comprising:
a sealed fluid cell having an internal cavity filled with fluid media, and a compensation portion and a measurement portion configured to interact with said fluid media in response to an externally applied fluid pressure; and
at least one sensor element coupled to said measurement portion of said sealed fluid cell, said compensation and measurement portions configured to deform in response to said externally applied fluid pressure to thereby change internal pressure conditions inside said sealed fluid cell and cause said measurement portion to experience differential pressure conditions corresponding to said external fluid pressure and to an internal pressure inside said sealed fluid cell.
2 . The sensor device of claim 1 comprising one or more deformations regulating elements disposed inside the internal cavity of the sealed fluid cell coupled to the compensation portion and configured to achieve a desired relation between the externally applied pressure and the internal pressure inside said sealed fluid cell.
3 . The sensor device of claim 1 comprising a hollow enclosure accommodating the sealed fluid cell thereinside, said hollow enclosure having at least one fluid inlet for applying the external fluid pressure to said sealed fluid cell.
4 . The sensor device of claim 3 comprising one or more support members configured to couple the sealed fluid cell to an internal wall of said hollow enclosure while enabling said sealed fluid cell to interact with fluid media causing the external fluid pressure, said one or more support members configured to permit fluid passage of the fluid media inside the hollow enclosure.
5 . The sensor device of claim 1 wherein the measurement portion comprises a sensing layer having the at least one sensor element in a deformable portion of said sensing layer.
6 . The sensor device of claim 5 comprising a base portion configured to define a measurement chamber, wherein the sensing layer is configured to sealably partition between the measurement chamber and the internal cavity of the sealed fluid cell.
7 . The sensor device of claim 6 comprising one or more deformations regulating elements disposed inside the measurement chamber coupled to the sensing layer of the measurement portion and configured to achieve a desired relation between the externally applied pressure and the internal pressure inside the sealed fluid cell.
8 . The sensor device of claim 6 wherein the measurement chamber is at least partially filled with an intermediating component configured to convey the external fluid pressure into the measurement chamber without direct contact between the sensing layer and a fluid substance affecting said external fluid pressure.
9 . The sensor device of claims 5 comprising a cover portion configured to define a cavity of the sealed fluid cell, and wherein an opening of said cavity is sealably closed by said sensing layer, thereby sealably closing the internal cavity of said sealed fluid cell.
10 . The sensor device of claim 1 comprising at least one sensor element operably installed inside the internal cavity of the sealed fluid cell and configured to measure at least one property or condition of the fluid media filling said internal cavity.
11 . The sensor device of claim 1 comprising at least one of the following: at least one circuitry configured to receive measurement data/signals from said at least one sensor element and transmit data/signals indicative thereof to at least one external device or system; a communication module configured for at least one of the following: (i) power the at least one circuitry; (ii) receive the data/signals transmitted from the at least one circuitry; and/or (iii) communicate the data/signals received from the at least one sensor element to a remote device or system, wherein the communication module is configured to wirelessly power the at least one circuitry and wirelessly receive the data/signals transmitted from the at least one circuitry.
12 . The sensor device of claim 1 wherein the sealed fluid cell is defined inside a spherical or cylindrical shaped element having a circumferential channel defining the internal cavity of said sealed fluid cell and at least one portion configured to define the compensation portion, and wherein the measurement portion comprises a circumferential deformable portion sealably covering said circumferential channel.
13 . The sensor device of claim 12 comprising one or more fluid channels passing through the spherical or cylindrical shaped element to fluidly communicate with the circumferential cavity.
14 . A method of preparing a sensor device, the method comprising forming in a base portion a deformable portion with at least one sensor element, preparing a cover portion to include a cavity and at least one compensation portion deformable towards said cavity, filling said cavity with fluid media and attaching said cover portion to said base portion such that an opening of said cavity is sealably closed by said deformable portion.
15 . The method of claim 14 comprising at least one of the following: attaching the cover portion to the base portion without the compensation portion, filling the cavity with the fluid media, and sealing said cavity by attaching the compensation portion to said cover portion;
coupling at least one circuitry to said at least one sensor element; coupling inside the cavity of the cover portion one or more deformations regulating elements to the compensation portion to achieve a desired relation between the externally applied pressure an internal pressure inside said cavity; forming a measurement chamber in said base portion configured to convey external fluid pressure to the deformable portion; coupling inside the measurement chamber one or more deformations regulating elements to the sensing layer of the base portion to achieve a desired relation between the externally applied pressure and an internal pressure inside the cavity of the base portion; at least partially filling the measurement chamber with an intermediating component configured to convey the external fluid pressure into the measurement chamber without establishing direct contact between the sensing layer and a fluid substance affecting said external fluid pressure; placing the cover portion with the base portion attached to it inside a hollow housing having an opening configured to convey the external fluid pressure into said hollow housing to substantially surround said cover and base portions.
16 . A method of using the sensor device of claim 15 comprising externally powering the at least one circuitry by an external module and transmitting by said at least one circuitry signals/data produced by the at least one sensor element to said external module.
17 . The method of any one of claims claim 14 wherein preparing the cover portion comprises forming a circumferential channel in a spherical or cylindrical shaped element, and the preparing of the base portion comprises placing at least one sensor element to a circumferential deformable portion and sealably covering said circumferential channel with said circumferential deformable portion.
18 . The method of claim 17 further comprising forming one or more fluid channels in the spherical or cylindrical shaped element, said one or more fluid channels configured to fluidly communicate with the circumferential cavity.
19 . A sensor device comprising: a spherical or cylindrical shaped element having a circumferential channel defining an internal cavity and at least one deformable portion configured to define a compensation portion of said sensor device; and a circumferential deformable portion sealably attached over said circumferential channel to define a sealed fluid cell of a measurement portion of said sensor device.
20 . The sensor device of claim 19 comprising one or more fluid channels passing through the spherical or cylindrical shaped element to fluidly communicate with the circumferential cavity.