Measurement and correlation of helium and fluid leak rates
Measurement and correlation of helium and fluid leak rates in Apollo propellants and ECS fluids
Senear, A. E.↗
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Combined study program. Volume 4 - Inlet leak study Final report
Inlet leak analysis for spacecraft mass spectrometer atmospheric sensor system
Moore, G. V.↗
Leak detector wherein a probe is monitored with ultraviolet radiation Patent
Gas leak detection in evacuated systems using ultraviolet radiation probe
Barrington, A. E.↗
Method for detecting leaks in hermetically sealed containers Patent
Method for locating leaks in hermetically sealed containers
Litant, I.↗
Method and apparatus for detecting gross leaks Patent
Volume displacement transducer for leak detection in hermetically sealed semiconductor devices
Orner, J. W.↗
Orifice gross leak tester Patent
Test chambers with orifice and helium mass spectrometer for detecting leak rate of encapsulated semiconductor devices
Altshuler, T. L.↗
Investigation of packaging, deployment, and leak-rate characteristics of an inflatable lunar-shelter model
Development, characteristics, and evaluation of inflatable lunar shelter model to determine leak rate in near vacuum conditions
Keffer, C. O.↗
Laboratory leak tester provides high sensitivity
Detecting unit is capable of measuring leak rates of 10 to the minus 5th power cc/sec or less. Device can be mounted in a carrying case and consists of three vacuum chambers, two pressure gages, and positive seal type control valves.
Hayes, E. G.↗
Helium Leak Measurements Using CO2 as a Carrier
Detection delay defects are omitted by using helium mass spectrometer leak detector combined with several known procedures. Technique combines carbon dioxide purging, cryogenic separating helium accumulation, and use of carbon dioxide as carrier gas.
Moore, B. C.↗
Leak test system
System for quantitative determination of leak rates in large pressurized compartments is described. Method uses pressure reference cylinder placed in thermal contact with internal environment of compartment. Construction of equipment and details of operational procedure are reported. Illustration of equipment is included.
Morris, R. G.↗
Nondestructive leak testing
Method provides opportunity to effect repairs without compromising integrity of enclosed circuitry or mechanism by loss of atmosphere or by ingestion of foreign matter or gas. It is possible to detect leaks in modules which are sealed while fully evacuated, partially evacuated, or containing some form of gas.
Lusby, T. K., Jr.↗
Feasibility of an on-line fission-gas-leak detection system
Calculations were made to determine if a cladding failure could be detected in a 100-kW zirconium hydride reactor primary system by monitoring the highly radioactive NaK coolant for the presence of I-131. The system is to be completely sealed. A leak of 0.01 percent from a single fuel pin was postulated. The 0.364-MeV gamma of I-131 could be monitored on an almost continuous basis, while its presence could be varified by using a longer counting time for the 0.638-MeV gamma. A lithium-drifted germanium detector would eliminate radioactive corrosion product interference that could occur with a sodium iodide scintillation detector.
Lustig, P. H.↗
Energetic neutrons leaking from the top of the atmosphere.
The energy, angular, and latitude distributions of energetic neutrons (up to 2 GeV) leaking from the top of the atmosphere have been calculated. The results agree with the recent measurement of Preszler, Simnett, and White, whose leakage rates were well above the calculation of Lingenfelter. Since the spectrum of Lingenfelter has served for evaluating the cosmic-ray albedo-neutron decay (CRAND) source of energetic protons in Earth's inner radiation belt, it is suggested that the results reported here be used to reevaluate the CRAND contribution.
Merker, M.↗
Vacuum leak detector
A leak detector for use with high vacuum seals as used in feedthroughs and hatch covers for manned spacecraft and vacuum systems is described. Two thermistors are used, one exposed directly to vacuum and the other exposed to a secondary chamber formed by the seal being monitored and a second auxiliary seal. Leakage into the secondary chamber causes an unbalance of an electrical bridge circuit in which the thermistors are connected.
Kazokas, G. P.↗
Inexpensive leak-detector envelope
Vacuum chamber is used with mass spectrometer to leak-check helical coils of tubing in large systems.
Lyon, T. F.↗
Stopping small liquid leaks
Technique helps locate minute liquid leaks in fittings of petroleum-base fuels.
Gilley, C. R.↗
Method for fabricating a mass spectrometer inlet leak
A method of fabricating an inlet leak for measuring chemically reactive gases is proposed. The method involves the steps of preparing a selected internal surface of a high melting point metal tubing for sealing to a glass tubing. A portion of the glass tubing is inserted into the prepared portion of the metal tubing, the glass tubing having an outer diameter substantially the same as the inner diameter of the metal tubing. The inserted glass tubing is sealed to the internal surface of the metal tubing; the glass tubing is drawn under a magnifying device to reduce the entire interior diameter thereof to substantially two microns; and an end portion of the drawing glass tubing is broken away.
Harris, R. F.↗