Leak checker data logging system

• US 5,551,285 A
• Filed: 05/18/1994
• Issued: 09/03/1996
• Est. Priority Date: 05/18/1994
• Status: Expired due to Fees

• Current Assignee: United States Department of Energy (Government of the United States of America)
• Original Assignee: United States Department of Energy (Government of the United States of America)
• Inventors: Gannon, Jeffrey C., Payne, John J.
• Primary Examiner(s): Chilcot, Richard
• Assistant Examiner(s): MCCALL, ERIC SCOTT
• Application Number:
  US08/245,272
• Time in Patent Office: 839 Days
• Field of Search: 73/40, 73/40.7, 340/605
• US Class Current: 73/40.7
• CPC Class Codes: G01M 3/205 Accessories or associated equipment; Pump constructions

Abstract

A portable, high speed, computer-based data logging system for field testing systems or components located some distance apart employs a plurality of spaced mass spectrometers and is particularly adapted for monitoring the vacuum integrity of a long string of a superconducting magnets such as used in high energy particle accelerators. The system provides precise tracking of a gas such as helium through the magnet string when the helium is released into the vacuum by monitoring the spaced mass spectrometers allowing for control, display and storage of various parameters involved with leak detection and localization. A system user can observe the flow of helium through the magnet string on a real-time basis hour the exact moment of opening of the helium input valve. Graph reading can be normalized to compensate for magnet sections that deplete vacuum faster than other sections between testing to permit repetitive testing of vacuum integrity in reduced time.

Claims

1. Apparatus for detecting and locating leaks in a closed system having a plurality of coupled, sealed modules containing a confined fluid, said apparatus comprising:

a plurality of remote detectors each coupled to a respective module and including a mass spectrometer for detecting escape of the confining fluid from the closed system;

a plurality of remote processing means for receiving, storing and transmitting data where each of said processing means is coupled to a respective one of said remote detectors;

a means for serially linking said plurality processing means one to another with a first processing means being coupled to a central processing unit and where said linking is accomplished by a plurality of twisted pairs of conductors each coupling adjacent pairs of remote processors,

and where said central processing unit provides a means for receiving an output signal and providing an operator of the system with an indication of escape of the confined fluid from the closed system and for providing operator initiated control inputs to said remote processors.

2. The apparatus of claim 1 wherein said confined fluid is liquid helium.

3. The apparatus of claim 1 wherein said central processor includes first and second memories for storing data representing output signals received from said remote processors and steering means for directing said data to said first and second memories at a variable acquisition rate and for reading data from said first and second memories at a variable off-loading rate.

4. The apparatus of claim 3 further comprising means for sequentially accessing each of said remote processors with said central processor for allowing tracking of the confined fluid within the sealed modules in said closed system.

5. Apparatus for detecting and locating leaks in a closed system having a plurality of coupled, sealed modules each including a super conducting magnet and containing a confined fluid, said apparatus comprising:

a plurality of remote detectors each coupled to a respective module and including a mass spectrometer for detecting escape of the confining fluid from the closed system;

a plurality of remote processors each coupled to a respective one of said remote detectors for providing an output signal in response to detection of escape of the confined fluid by its associated remote detector;

a plurality of twisted pairs of conductors each coupling adjacent pairs of remote processors, wherein a first remote processor re-transmits an output signal received from a second remote processor via a first twisted pair of conductors to a third remote processor via a second twisted pair of conductors; and

a central processor coupled to a remote processor by means of a twisted pair of conductors for receiving an output signal and providing an operator of the system with an indication of escape of the confined fluid from the closed system and for providing operator initiated control inputs to said remote processors.

6. The apparatus of claim 5 further comprising a value coupling a reservoir of the confined fluid to the closed system, wherein said central processor is coupled to said valve for controlling and monitoring introduction of the confined fluid into the closed system.

7. The apparatus of claim 5 wherein said confined fluid is liquid helium.

8. The apparatus of claim 5 wherein said central processor includes first and second memories for storing data representing output signals received from said remote processors and steering means for directing said data to said first and second memories at a variable acquisition rate and for reading data from said first and second memories at a variable off-loading rate.

9. The apparatus of claim 6 further comprising means for sequentially accessing each of said remote processors with said central processor for allowing tracking of the confined fluid within the sealed modules in said closed system.

10. An apparatus for detecting and locating a fluid or a gaseous leak comprising:

a plurality of remote detectors capable of detecting a fluid or a gas presence where said detectors provide a means for processing and transmitting said presence as a specific electrical signal;

a plurality of primary remote processing means where each processing means of said plurality is coupled to a respective one of said remote detectors for receiving, storing and processing a plurality of electrical signals which includes said specific electrical signal;

a plurality of connection means for serially connecting adjacent remote processing means in a sequential manner to a central processing unit where said central processing unit provides a means for transmitting control and data collection signals to an first primary remote processing means in the form of a signal having a leading edge and a trailing edge where said leading edge initiates data collection and said trailing edge initiates ordered data transmission from said plurality of primary remote processing means to said central processing unit in a sequential manner, and a means for receiving and processing collected data signals at said central processing unit in response to said control signals and said data collection signals.

11. The apparatus of claim 10 where said remote detector includes a mass spectrometer.

12. The apparatus of claim 10 where additional primary remote processing means are coupled to a single primary remote processing means for providing enhanced local detection coverage.

13. The apparatus of claim 12 where said primary remote means includes a means for processing said additional remote processing means as part of a new serially connected sequential chain of remote processing means with said additional processing means assuming a position relative to said single primary remote processing means.

14. The apparatus of claim 10 where additional primary remote processing means are coupled to an end point of a string of serially connected remote processing means.

15. The apparatus of claim 14 where said additional primary remote means includes a means for processing said additional processing means as part of a new serially connected sequential chain of remote processing means with said additional processing means assuming a sequential position relative to said single primary remote processing means.

16. The apparatus of claim 10 where said remote process means provides a means for repeating a data collection signal received from a alternate remote processing means located at a further distance from said central processing unit.

17. The apparatus of claim 10 wherein said central processing unit includes a means for collecting data at a variable acquisition rate.

18. An apparatus for detecting and locating a fluid or a gaseous leak comprising:

a plurality of remote detectors, including a mass spectrometer, capable of detecting a fluid or a gas presence where said detectors provide a means for processing and transmitting said presence as a primary electrical signal;

a plurality of primary remote processing means each coupled to a respective one of said remote detectors for receiving, storing and processing a plurality of electrical signals which includes said primary electrical signal;

a plurality of connection means for serially connecting adjacent remote processing means in a sequential manner to a central processing unit where said central processing unit provides a means for transmitting control and data collection signals to said primary remote processing means in the form of a signal having a leading edge and a trailing edge where said leading edge initiates data collection and said trailing edge initiates data transmission and a means for receiving collected data signals in response to said control signals and said data collection signals.

19. The apparatus of claim 18 where additional primary remote processing means are coupled to a single primary remote processing means for providing enhanced local detection coverage.

20. The apparatus of claim 19 where said primary remote means includes a means for processing said additional remote processing means as part of a new serially connected sequential chain of remote processing means with said additional processing means assuming a position relative to said single primary remote processing means.

21. The apparatus of claim 18 where additional primary remote processing means are coupled to an end point of a string of serially connected remote processing means.

22. The apparatus of claim 21 where said additional primary remote means includes a means for processing said additional processing means as part of a new serially connected sequential chain of remote processing means with said additional processing means assuming a sequential position relative to said single primary remote processing means.

23. The apparatus of claim 18 where said remote process means provides a means repeating a data collection signal received from a alternate remote processing means located at a further distance from said central processing unit.

24. The apparatus of claim 18 wherein said central processing unit includes a means for collecting data at a variable acquisition rate.