FOAM PRESSURE SENSOR

• US 20170199095A1
• Filed: 07/13/2015
• Published: 07/13/2017
• Est. Priority Date: 07/14/2014
• Status: Active Grant

• Current Assignee: Rogers Corporation (Rogers Communications Inc.)
• Original Assignee: Rogers Corporation (Rogers Communications Inc.)
• Inventors: SHERE, Aniruddha, SPRENTALL, Karl E.
• Granted Patent: US 10,378,983 B2
• Time in Patent Office: Days
• CPC Class Codes: G01L 9/0005 using variations in capacitance G01L9/0072 takes precedence
• CPC Class Codes: G01L 9/12 by making use of variations in capacitance , i.e. electric circuits therefor

Abstract

A pressure sensor includes a first plate (102), a second plate (104) and a foam (106) disposed between the first and second plate. The foam is a polyurethane foam having an average cell size of about 50 to 250 urn and a density of between 5 to 30 lbs/ft3.

Claims

1. A pressure sensor comprising:

a first plate;

a second plate; and

a foam disposed between the first and second plate, wherein the foam is a polyurethane foam having an average cell size of about 50 to 250 μ

m and a density of between 5 to 30 lbs/ft³.

2. The pressure sensor of claim 1, wherein the foam has a density between 6 to 25 lbs/ft³.

3. The pressure sensor of claim 1, wherein the foam has a compression set of less than about 10%.

4. The pressure sensor of claim 1, wherein the foam has a force-deflection of between about 1-9 psi (7-63 kPa).

5. The pressure sensor of claim 1, wherein the plates are metallic.

6. A pressure sensor comprising:

a first plate;

a second plate;

a foam disposed between the first and second plate; and

a conductor clad piezoelectric film disposed on a surface of one of the first or second plates.

7. The pressure sensor of claim 6, wherein the foam has a density between 6 to 25 lbs/ft³.

8. The pressure sensor of claim 6, wherein the foam has a compression set of less than about 10%.

9. The pressure sensor of claim 6, wherein the foam has a force-deflection of between about 1-9 psi (7-63 kPa).

10. The pressure sensor of claim 6, wherein the plates are metallic.

11. The pressure sensor of claim 6, wherein the foam is a polyurethane foam having an average cell size of about 50 to 250 μ

m and a density of between 5 to 30 lbs/ft³.

12. The pressure sensor of claim 6, wherein the conductor clad piezoelectric film is configured to have a bandwidth larger than a bandwidth of a combination of the first plate, second plate and the foam.

13. The pressure sensor of claim 6, wherein the first plate, the second plate and the foam form a foam capacitor and wherein the foam capacitor and the conductor clad piezoelectric film are connected such that a ground level is formed between them.

14. The pressure sensor of claim 13, wherein the conductor clad piezoelectric film is connected between an analog to digital converter and the ground level.

15. The pressure sensor of claim 13, wherein the foam capacitor is connected between a capacitance sensor and the ground level.