Temperature and pressure sensors and methods
AssigneesThe Florida State University Research Foundation, Inc., Government of the United States as Represented by the Secretary of the Air Force
InventorsChengying Xu, Amanda Schrand, Reamonn Soto
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Abstract
Temperature sensors, pressure sensors, methods of making the same, and methods of detecting pressures and temperatures using the same are provided. In an embodiment, the temperature sensor includes a ceramic coil inductor having a first end plate and a second end plate, wherein the ceramic coil inductor is formed of a ceramic composite that comprises carbon nanotubes or, carbon nanofibers, or a combination of carbon nanotubes and carbon nanofibers thereof dispersed in a ceramic matrix; and a thin film polymer-derived ceramic (PDC) nanocomposite disposed between the first and the second end plates, wherein the thin film PDC nanocomposite has a dielectric constant that increases monotonically with temperature.
Claims11
A pressure sensor comprising:
- a disk-shaped polymer-derived ceramic (PDC) nanocomposite structure comprising walls that define an internal cavity having a first cavity surface and an opposed second cavity surface;
- and
- a ceramic coil inductor disposed on an outer surface of the PDC nanocomposite structure having a first end plate, a coil portion extending circumferentially from the first end plate, and a second end plate, wherein the PDC nanocomposite structure is disposed between the first and second end plates,
- wherein the ceramic coil inductor is formed of a ceramic composite that comprises carbon nanotubes, carbon nanofibers, or a combination thereof dispersed in a ceramic matrix, and
- wherein the first and second cavity surfaces are spaced a distance from one another.
A pressure sensor comprising:
- a disk-shaped polymer-derived ceramic (PDC) nanocomposite structure comprising walls that define an internal cavity having a first cavity surface and an opposed second cavity surface;
- and
- a ceramic coil inductor disposed on an outer surface of the PDF nanocomposite structure having a first end plate, a coil portion extending circumferentially from the first end plate, and a second end plate, wherein the PDC nanocomposite structure is disposed between the first and second end plates,
- wherein the ceramic coil inductor is formed of a ceramic composite that comprises carbon nanotubes dispersed in a ceramic matrix, wherein the volume fraction of carbon nanotubes in the ceramic composite is from 15% to 70%,
- wherein a protrusion extends from the first cavity surface, the protrusion having an elevated regional surface,
- wherein the elevated regional surface of the protrusion and the second cavity surface are spaced a distance from one another and a change in the distance between the elevated regional surface of the protrusion and the second cavity surface produces a frequency shift of an electromagnetic signal induced in the ceramic coil inductor to detect a change in pressure of an environment, and
- wherein the pressure sensor is configured to detect the change in pressure in the environment with a pressure in the range from 0 psi to 40,000 psi.
Dependencies are inferred from the claim text.