HAND-HELD VIBRATION SENSOR

• US 20140366635A1
• Filed: 09/28/2012
• Published: 12/18/2014
• Est. Priority Date: 09/29/2011
• Status: Active Grant

• Current Assignee: PCB Piezotronics, Inc. (Amphenol Corporation)
• Original Assignee: PCB Piezotronics, Inc. (Amphenol Corporation)
• Inventors: Zusman, George V.
• Granted Patent: US 9,523,626 B2
• Time in Patent Office: Days
• US Class Current: 73/658
• CPC Class Codes: G01H 1/00 Measuring characteristics of vibrations in solids by using direct conduction to the detector G01H9/00, G01H11/00 take precedence
• CPC Class Codes: G01H 1/003 of rotating machines G01H1/10 takes precedence

Abstract

A hand-held or portable vibration sensor device having a housing and a sensor body which generally provides a single point of contact with the machinery or apparatus for which vibration measurement is desired. In one aspect, the sensor body comprises a vibration sensor element such as an accelerometer for measuring vibration. In another aspect, a force sensor such as a force sensing resistor or load cell is provided to reduce the impact of forces applied to said hand-held vibration sensor such as a force applied through a handle during measurement. In another aspect, a compensation circuit processes the out put from a vibration sensor element to provide a relatively flat frequency response over a desired operational frequency range. The hand-held vibration sensor may also comprise a rubber isolation member disposed between the sensor body and force sensor.

Claims

1. A hand-held vibration sensor, comprising:

a housing;

a sensor body having a generally conical portion with a sharp point;

a vibration sensor element within said sensor body, said vibration sensor element measuring vibration and generating a corresponding vibration sensor element output;

a force sensor in communication with said sensor body generating a force sensor output corresponding to changes in the resistance of said force sensor as a function of non-vibrational forces applied to the hand-held vibration sensor;

an analog-to-digital converter within said housing and coupled to said vibration sensor element; and

a microprocessor adjusting said vibration sensor element output as a function of said force sensor output to reduce the impact of said non-vibrational applied forces on said vibration sensor element output, said microprocessor coupled to said analog-to-digital converter.

2. The hand-held vibration sensor of claim 1 wherein said vibration sensor element is an accelerometer.

3. The hand-held vibration sensor of claim 1 wherein said force sensor is a force sensing resistor or load cell.

4. The hand-held sensor of claim 1, further comprising:

a compressible mechanical isolation member interposed between said sensor body and said force sensor.

6. The hand-held sensor of claim 1, further comprising:

a compensation circuit in electrical communication with said vibration sensor element, said compensation circuit receiving said vibration sensor element output and processing said vibration sensor output such that a relativity flat frequency response results over a desired operational frequency range.

7. The hand-held sensor of claim 1, further comprising:

a high frequency channel comprising a compensation circuit in electrical communication with said vibration sensor element, said compensation circuit receiving said vibration sensor element output and processing said vibration sensor output such that a relativity flat frequency response results over a desired high frequency range; and

a low frequency channel comprising a gain regulator, amplifier or filter.

8. The hand-held sensor of claim 1, further comprising:

a display on said housing in communication with said microprocessor, said display displaying said adjusted vibration sensor element output.

5. The hand-held sensor of claim 5 wherein said compressible mechanical isolation member comprises rubber, plastic or polyurethane.

9. A hand-held vibration sensor for measuring vibration in a machine, comprising:

a sensor body having a generally conical portion with a sharp point;

an accelerometer within said sensor body measuring vibration and generating a corresponding accelerometer output representative of vibration present in a machine contacted by said sharp point;

a compensation circuit in electrical communication with said accelerometer, said compensation circuit receiving said accelerometer output and providing a relativity flat frequency response over a desired operational frequency range;

a force sensing resistor in communication with said sensor body, said force sensing resistor generating a force sensor output as a function of forces applied to the hand-held vibration sensor by a user; and

means for adjusting said accelerometer output as a function of said force sensor output.

10. The hand-held sensor of claim 9, further comprising:

a compressible isolation member interposed between said sensor body and said force sensing resistor, said compressible isolation member comprising rubber, plastic or polyurethane.

11. A hand-held vibration sensor for measuring vibration in a machine, comprising:

a housing;

a sensor body having a generally conical portion with a sharp point;

a vibration sensor element coupled to said sensor body, said vibration sensor element having a vibration sensor element output representative of vibration present in a machine contacted by said sharp point;

a force sensor in communication with said sensor body generating a force sensor output corresponding to the resistance of said force sensor as a function of forces applied to the hand-held vibration sensor by a user;

a processor within said housing receiving said vibration sensor element output and said force sensor output, said processor adjusting said vibration sensor element output as a function of said force sensor output to reduce the impact of said user applied forces on said vibration sensor element output.

12. The hand-held vibration sensor of claim 11 wherein said vibration sensor element is an accelerometer.

13. The hand-held vibration sensor of claim 11 wherein said force sensor is a force sensing resistor or a load cell.

14. The hand-held sensor of claim 11, further comprising:

a rubber isolation member interposed between said sensor body and said force sensor.

15. The hand-held sensor of claim 11, further comprising:

a compensation circuit in electrical communication with said vibration sensor element, said compensation circuit receiving said vibration sensor element output and producing a relativity flat frequency response over a desired operational frequency range.

16. The hand-held sensor of claim 11, further comprising:

a high frequency channel comprising a compensation circuit in electrical communication with said vibration sensor element, said compensation circuit receiving said vibration sensor element output and processing high frequency signals; and

a low frequency channel processing low frequency signals.