摘要:

Sealing techniques have been perfected which utilize the properties of fluorocarbon plastics to make high vacuum seals. Several designs are described in which confined gaskets are used instead of O‐rings, with consequent reduction of contamination from outgassing and permeation. These sealing techniques have been incorporated into a series of modular components which may be used for assembly of high vacuum systems. Some of these components are movable joints which allow leak‐free motion between parts of a system. While not suited for high temperature bakeout, systems constructed from these modular components are capable of being pumped below 10−7Torr. Dependable systems can easily be assembled or modified using these components, with no detectable helium leaks at a level of 2×10−10std cm3/sec.

ISSN:0034-6748    

DOI:10.1063/1.1684697

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

A new instrument for the measurement of liquid level has been developed, which makes use of the fact that an electric pulse advancing on a transmission line is reflected from any point on the line where the line impedance changes abruptly. Such a change of impedance is obtained at a sudden change of the dielectric constant in the transmission line, i.e., if a fluid is partially introduced in the line. The instrument is further based on the sing‐around principle, which gives directly a digital output signal of high accuracy and linearity, in the order of ±0.02%. The instrument can be used for all liquids having a dielectric constant greater than 1.1 or sufficient electrical conductivity.

ISSN:0034-6748    

DOI:10.1063/1.1684698

出版商:AIP    

年代:1970

数据来源: AIP

摘要:

A capacitor is described which has been used to make accurate measurements of the dielectric constant of liquid and gaseous oxygen over a wide temperature (55–300 K) and pressure (0.2–34 MN/m2) range. The capacitor is simple to construct and its stability is unaffected by large hydrostatic pressure variations. The temperature variation of the vacuum capacitance is small and remains reproducible even after repeated temperature and pressure cycling.

ISSN:0034-6748    

DOI:10.1063/1.1684699

出版商:AIP    

年代:1970

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1684700

出版商:AIP    

年代:1970

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1684701

出版商:AIP    

年代:1970

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1684703

出版商:AIP    

年代:1970

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1684705

出版商:AIP    

年代:1970

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1684706

出版商:AIP    

年代:1970

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1684707

出版商:AIP    

年代:1970

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1684708

出版商:AIP    

年代:1970

数据来源: AIP