System and method for optical vibration sensing

• US 7,168,323 B1
• Filed: 09/28/1999
• Issued: 01/30/2007
• Est. Priority Date: 09/28/1999
• Status: Expired due to Fees

• Current Assignee: Rockwell Automation Technologies Incorporated (Allen-Bradley Co., Inc.)
• Original Assignee: Rockwell Automation Technologies Incorporated (Allen-Bradley Co., Inc.)
• Inventors: Discenzo, Frederick M.
• Primary Examiner(s): LEE, HWA S
• Application Number:
  US09/406,368
• Time in Patent Office: 2,681 Days
• Field of Search: 356/25, 356/27, 356/28, 356/28.5, 73652-657
• US Class Current: 73/655
• CPC Class Codes: G01H 9/00 Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
• CPC Class Codes: G01M 15/12 by monitoring vibrations

Abstract

A system for sensing vibration of a machine is provided. A light source directs a beam of light toward a light receiving system adapted to receive at least a portion of the beam of light. A light modulating system modulates the light beam received by the light receiving system so as to correspond to vibration of the machine. A processing system operatively coupled to the light receiving system processes data received from the light receiving system to facilitate determining vibration of the machine.

Claims

1. A multiple axis version vibration detection system, comprising:

a light source that directs a beam of light;

a light receiving system thai receives at least a portion of the beam of light;

a first light modulating system that modulates the light beam received by the light receiving system so as to correspond with vibration of a machine;

a second light modulating system that modulates the light beam received by the light receiving system so as to correspond with vibration of the machine, the second light modulating system being in series to the first light modulating system; and

a processing system that analyzes data received from the light receiving system to determine vibration of the machine in a plurality of axes.

2. The system of claim 1, at least one of the first light modulating system and the second light modulating system include an obstruction modulator that obstructs the beam of light so that only a portion of the beam of light is received by the light receiving system.

3. The system of claim 2, the obstruction modulator obstructs the light beam when the machine is vibrating.

4. The system of claim 2, the obstruction modulator obstructs the light beam when the machine is not vibrating.

5. A system that determines a vibration state for a machine, comprising:

a light receiver that receives a light from a source;

light modulating system comprising an annular structure that based on a particular vibration state of a machine obscures a portion of light transmitter from the source to the light receiver, and

a processor that analyzes an amount of light received by the light receiver to determine the particular vibration state.

6. The system of claim 5, the amount of light received by the light receiver increases with increased vibration state of the machine.

7. The system of claim 5, the amount of light received by the light receiver decreases with increased vibration state of the machine.

8. The system of claim 5, the light modulating system including a housing with a first opening that receives a light beam, a second opening that allows passage of a light beam to the light receiver as a function of a vibration state of the machine.

9. The system of claim 5, the light modulating system is attached to the machine.

10. The system of claim 5, the annular structure permits light to pass in one direction.

11. The system of claim 5, the processor determines a vibration state of the machine based upon an area illuminated on a surface of the light receiver.

12. A system that determines a vibration state for a machine, comprising:

a light receiver that receives light from a source;

a light modulating system, having an annular structure, that obscures a portion of light transmitted from the source to the light receiver based on a particular vibration state of the machine, and

a processor that analyzes an amount of light received by the light receiver to determine the particular vibration state of the machine.

13. The system of claim 12, the annular structure allows light to pass in one direction.

14. The system of claim 12, the light modulating system includes a housing with a first opening that receives a light beam and a second opening that permits the light beam to pass to the light receiver as a function of the vibration state of the machine.

15. The system of claim 12, the light modulating system is attached to the machine.

16. The system of claim 12, the processor determines the vibration state of the machine based upon an area illuminated on the surface of the light receiver.

17. The system of claim 12, the amount of light received by the light receiver increased with increased vibration state of the machine.

18. The system of claim 12, the amount of light received by the light receiver decreases with increased vibration state of the machine.