Pneumatic filter

Patent metadata

Field	Value
Publication number	US-9683877-B2
Application number	US-201514601768-A
Country	US
Kind code	B2
Filing date	Jan 21, 2015
Priority date	Jan 21, 2015
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

A tuned sensor system is disclosed. The tuned sensor system may receive an unsteady pressure from an external environment via a pressure inlet port. The pressure may have a first component that is substantially static and a second component that varies at a relatively high frequency. The pressure inlet port may conduct the unsteady pressure to a tuned path. The tuned path may filter the unsteady pressure, blocking the second component and communicating the first component, such as for use by a pressure sensor. The tuned sensor system may be compact and may include one or more turn in the tuned path so that the distance between the pressure inlet port and the sensor is less than the length of the tuned path. The tuned path may be entirely within the supporting structure of the tuned sensor system, easing installation, removal, and maintenance of the compact and modular system.

First claim

What is claimed is:

1. A modular tuned sensor system comprising:
a main body having a tuned path in fluidic communication with a pressure inlet port;
an enclosing member having a planar structure defining a portion of the tuned path of the main body and sealing the tuned path from leaking; and the pressure inlet port having an aperture disposed in the enclosing member; and
a sensor terminus having an aperture defined through the main body and in fluidic communication with the tuned path, the sensor terminus disposed at an opposite end of the tuned path from the pressure inlet port,
wherein the pressure inlet port is configured to be aligned to at least one of an opening in an external surface of an aircraft and an opening in a propulsion system surface.

2. The modular tuned sensor system according to claim 1 ,
wherein the tuned path comprises a channel disposed in the main body and receiving an unsteady pressure from the pressure inlet port, and
wherein the pressure inlet port is in fluidic communication with an external environment.

3. The modular tuned sensor system according to claim 2 ,
wherein the unsteady pressure comprises a first component with a static pressure and a second component with a high frequency variable pressure, and
wherein the tuned path blocks the second component and transmits the first component from the pressure inlet port to the sensor terminus.

4. The modular tuned sensor system according to claim 1 , wherein the tuned path comprises a plurality of turns, whereby a distance between the pressure inlet port and the sensor terminus is less than a length of the tuned path.

5. The modular tuned sensor system according to claim 1 , the main body further comprising a pressure inlet port interface with a void defined by the main body and aligned corresponding to the pressure inlet port of the enclosing member.

6. The modular tuned sensor system according to claim 5 , the pressure inlet port further comprising a disc shaped void defined by the main body and disposed at a circumferential center of the main body.

7. The modular tuned sensor system according to claim 1 ,
the main body further comprising main body mounting hardware and the enclosing member further comprising enclosing member mounting hardware,
whereby fasteners may be inserted through at least one of the main body and the enclosing member and the main body and the enclosing member may be retained in fixed mechanical communication with one another.

8. The modular tuned sensor system according to claim 1 , wherein the main body further comprises a sensor mount, and wherein the sensor terminus is further defined through a surface of the sensor mount.

9. The modular tuned sensor system according to claim 8 , further comprising a sensor attached to the sensor mount and in fluidic communication with the sensor terminus.

10. The modular tuned sensor system according to claim 1 , wherein the tuned path comprises:
a shape having a tubular structure with a circular cross-section;
a radius of about 0.03 inches; and
a length of at least about one foot.

11. The modular tuned sensor system according to claim 10 , wherein the tuned path comprises a behavior exhibited in response to the shape, the radius, and the length.

12. The modular tuned sensor system according to claim 11 , wherein the behavior comprises a low pass filter with a roll-off frequency disposed between the first component and the second component.

13. The modular tuned sensor system according to claim 11 , wherein the behavior comprises a band pass filter.

14. A tuned sensor system comprising:
a pressure inlet port receiving an unsteady pressure with a first component having a static pressure and a second component having a high frequency variable pressure from an external environment; and
a tuned path receiving the unsteady pressure from the pressure inlet port and conducting the first component to a sensor terminus and blocking the second component,
wherein a distance between the pressure inlet port and the sensor terminus is less than a length of the tuned path, and
the pressure inlet port is configured to be aligned to at least one of an opening in an external surface of an aircraft and an opening in a propulsion system surface.

15. The tuned sensor system of claim 14 , wherein the tuned path comprises:
a shape having a tubular structure with a circular cross-section; and
a radius of about 0.03 inches.

16. The tuned sensor system of claim 14 , wherein the tuned path comprises a low pass filter with a roll-off frequency disposed between the first component and the second component.

17. The tuned sensor system according to claim 14 , wherein the tuned path comprises a turn.

18. The tuned sensor system according to claim 14 , further comprising a sensor in fluidic communication with the sensor terminus and providing an electronic signal in response to the first component.

19. A method of pneumatic filtering comprising:
receiving an unsteady pressure at a pressure inlet port wherein the unsteady pressure has a first component with a static pressure and a second component with a variable pressure;
conducting the unsteady pressure from the pressure inlet port to a tuned path disposed in a main body;
transmitting the first component of the unsteady pressure to a sensor terminus; and
blocking the second component of the unsteady pressure,
wherein the tuned path comprises a plurality of turns, whereby a distance between the pressure inlet port and the sensor terminus is less than a length of the tuned path.

Assignees

• Rosemount Aerospace Inc

Inventors

• Daup Michael Robert
• Sherman Andrew

Classifications

• G01F1/46 Primary

  Pitot tubes · CPC title

• G01P5/14

  by measuring differences of pressure in the fluid · CPC title

• G01L19/0609 Primary

  Pressure pulsation damping arrangements · CPC title

• G01L19/0007 Primary

  Fluidic connecting means · CPC title