High sensitivity leak detection method and apparatus

Title: High sensitivity leak detection method and apparatus

Full Record
Other Related Research

Abstract

An improved leak detection method is provided that utilizes the cyclic adsorption and desorption of accumulated helium on a non-porous metallic surface. The method provides reliable leak detection at superfluid helium temperatures. The zero drift that is associated with residual gas analyzers in common leak detectors is virtually eliminated by utilizing a time integration technique. The sensitivity of the apparatus of this disclosure is capable of detecting leaks as small as 1 [times] 10[sup [minus]18] atm cc sec[sup [minus]1]. 2 figs.

Inventors:: Myneni, G R

Publication Date:: 1994-09-06

OSTI Identifier:: 6978732

Patent Number(s):: US 5343740; A

Application Number:: PPN: US 8-113718

Assignee:: Southeastern Universities Research Association, Newport News, VA (United States)

DOE Contract Number:: AC05-84ER40150

Resource Type:: Patent

Resource Relation:: Patent File Date: 27 Aug 1993

Country of Publication:: United States

Language:: English

Subject:: 47 OTHER INSTRUMENTATION; LEAK DETECTORS; DESIGN; HELIUM; SENSITIVITY; SUPERFLUIDITY; ELEMENTS; FLUIDS; GASES; NONMETALS; RARE GASES; 440800* - Miscellaneous Instrumentation- (1990-)

Citation Formats


                    Myneni, G R. High sensitivity leak detection method and apparatus.  United States: N. p., 1994. 
        Web.

Copy to clipboard


                    Myneni, G R. High sensitivity leak detection method and apparatus.  United States.

Copy to clipboard


                    Myneni, G R. Tue .  
        "High sensitivity leak detection method and apparatus".  United States.

Copy to clipboard


                    
@article{osti_6978732,

  title        = {High sensitivity leak detection method and apparatus},

  author       = {Myneni, G R},

  abstractNote = {An improved leak detection method is provided that utilizes the cyclic adsorption and desorption of accumulated helium on a non-porous metallic surface. The method provides reliable leak detection at superfluid helium temperatures. The zero drift that is associated with residual gas analyzers in common leak detectors is virtually eliminated by utilizing a time integration technique. The sensitivity of the apparatus of this disclosure is capable of detecting leaks as small as 1 [times] 10[sup [minus]18] atm cc sec[sup [minus]1]. 2 figs.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/6978732},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1994},

  month        = {9}

}

Copy to clipboard

Patent:

Search for the full text at the U.S. Patent and Trademark Office

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

High sensitivity leak detection method and apparatus

Patent Myneni, Ganapatic R

An improved leak detection method is provided that utilizes the cyclic adsorption and desorption of accumulated helium on a non-porous metallic surface. The method provides reliable leak detection at superfluid helium temperatures. The zero drift that is associated with residual gas analyzers in common leak detectors is virtually eliminated by utilizing a time integration technique. The sensitivity of the apparatus of this disclosure is capable of detecting leaks as small as 1.times.10.sup.-18 atm cc sec.sup.-1.
Full Text Available
High sensitivity He desorption leak detection method

Journal Article Rao, M G - Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States)

A new high sensitivity leak detection method has been developed for the superconducting radio-frequency (SRF) acceleration cavities for the CEBAF linacs. The vacuum integrity of the SRF cavity pairs and the associated indium-sealed vacuum flanges is essential for the successful operation of the accelerator. These SRF cavity pairs are immersed in superfluid helium to minimize rf heat load to the cryogenic system. Conventional leak detection techniques are not appropriate to leak check these cavity pairs at superfluid helium temperature (2 K), since He will be adsorbed onto the cavity surfaces. Further, the sensitivity of the conventional leak detectors is limitedmore »« less
https://doi.org/10.1116/1.578511
High sensitivity He desorption leak detection method

Journal Article Rao, M G - J. Vac. Sci. Technol. A 11, 1598 (1993)

A new high sensitivity leak detection method has been developed for the superconducting radio-frequency (SRF) acceleration cavities for the CEBAF linacs. The vacuum integrity of the SRF cavity pairs and the associated indium-sealed vacuum flanges is essential for the successful operation of the accelerator. These SRF cavity pairs are immersed in superfluid helium to minimize rf heat load to the cryogenic system. Conventional leak detection techniques are not appropriate to leak check these cavity pairs at superfluid helium temperature (2 K), since He will be adsorbed onto the cavity surfaces. Further, the sensitivity of the conventional leak detectors is limitedmore »« less
Contamination free helium leak detection of sensitive systems

Conference Myneni, G

High Technology Systems (HTS) with sensitive surfaces, such as superconducting radio frequency (SRF) accelerating cavities, polarized electron sources (PES) for accelerators and many others, are prone to degradation when subjected to particulate or hydrocarbon contaminants. Particulate contamination control of SRF cavity surfaces and vacuum components have been discussed by several authors at this contamination workshop. Hydrocarbon contamination mainly results from prolonged evacuation with conventional oil lubricated pumping systems and/or prolonged leak detection with conventional leak detectors. The sensitivity of the conventional leak detectors suffers due to the back-streaming of atmospheric helium (5 x 10{sup {minus}1} Pa) through the pumping systemsmore »« less
Full Text Available
Technical basis for inner container leak detection sensitivity goals in 3013 DE surveillance

Technical Report Berg, John M.

Helium leak checking of 3013 inner container lids is under consideration for addition to DE Surveillance tasks as an improved means to detect any through-wall flaws that may have formed during storage. This white paper evaluates whether leak checking at DE could replace and improve upon the current method of comparing gas compositions and pressures within the inner and outer containers. We have used viscous and molecular flow equations in ANSI N14.5 to calculate what the measured standard helium leak rate would be for hypothetical leaks of three different sizes. For comparison, we have also calculated the effects on gasmore »« less
https://doi.org/10.2172/1375143

Full Text Available

Similar Records