Method and apparatus for discerning degradation of electromagnetic radiating tubes

• US 6,667,711 B1
• Filed: 11/20/2002
• Issued: 12/23/2003
• Est. Priority Date: 05/31/2001
• Status: Expired due to Fees

• Current Assignee: The Government Of The United States As Represented By The Secretary Of The Navy
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Brock, David W., Russell, Stephen D., Joshi, Narayan R., Kasa, Shannon D., Garcia, Graham A.
• Primary Examiner(s): Sotomayor, John B.
• Application Number:
  US10/302,319
• Time in Patent Office: 398 Days
• Field of Search: 342/165-174
• US Class Current: 342/165
• CPC Class Codes: G01S 7/4008 of transmitters

Abstract

The invention is designed to employ one or a multitude of sensors designed to allow operational monitoring of any of a variety of electromagnetic radiating tubes. Monitoring is conducted to detect a degradation in performance which can be used as a factor in deciding whether tube replacement is justified. Contrary to some past approaches that focused on averaged tube outputs, the invention is designed to examine individual tube pulses.

Claims

1. A method for detecting degradation of a radar transmitting tube comprising the steps of:

operating said tube; and

analyzing an individual pulse of said tube for anomalous characteristics including

collecting acoustic emissions corresponding to said individual pulse of said tube;

equating an acoustic emission having a predetermined characteristic as indicative of a faulty tube, wherein said radar transmitting tube is one chosen from a group including a magnetron, a traveling wave tube and a klystron.

2. The method according to claim 1 wherein said method includes:

utilizing a current sensor to sense current at a cathode of said tube; and

equating current corresponding to a pulse having a predetermined characteristic as indicative of a faulty tube.

3. An apparatus for detecting degradation of a radar transmitting tube comprising:

an operating radiating tube system including said radar transmitting tube; and

means for analyzing an individual pulse of said tube for anomalous characteristics, said means for analyzing including

acoustic emission collecting means for collecting acoustic emissions corresponding to an individual pulse of said tube; and

means for processing said acoustic emissions wherein an acoustic emission having a predetermined characteristic is considered indicative of a faulty tube.

4. The apparatus of claim 3 wherein said radar transmitting tube is one chosen from a group including a magnetron, a traveling wave tube and a klystron.

5. The apparatus of claim 3 wherein said apparatus includes:

cathode current sensing means for sensing current at a cathode of said tube; and

means for processing said current sensed at said cathode wherein current corresponding to pulses having a predetermined characteristic is considered indicative of a faulty tube.

6. The apparatus of claim 5 wherein said radar transmitting tube is one chosen from a group including a magnetron, a traveling wave tube and a klystron.