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| 11. |
An automatic continuous denier recorder for synthetic textile yarns |
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Proceedings of the IEE - Part B: Electronic and Communication Engineering,
Volume 107,
Issue 35,
1960,
Page 466-472
C.D.Rutter,
R.D.Wright,
R.N.Aldrich-Smith,
E.J.R.Hewitt,
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PDF (981KB)
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摘要:
Measuring the diameter of a fine textile filament by its electrical capacitance effect between the fixed plates of a capacitor presents the twin problems of the very small capacitance change to be measured and the high degree of stability to be maintained in the capacitor.The present instrument is insensitive to changes in the standing capacitance and achieves this by vibrating the yarn in and out of the gap. The capacitance between the two electrodes is therefore varying at the frequency of the vibrating yarn, and a variable capacitor is switched into circuit in phase with the yarn and used to balance this change in capacitance in a bridge circuit. The output from the bridge is amplified and used to drive a motor which balances the bridge by adjusting the variable capacitor. The movement of the motor also drives a pen recorder. The bridge circuit conveniently provides several measuring ranges and allows the measuring head to be one of several connected to the main instrument by long cables.Synthetic-fibre manufacture involves numerous identical production units in parallel. Monitoring and control gear is therefore fed from a multiplicity of transducers which must be matched, reliable and capable of simple routine test and replacement without upsetting their related circuits.
DOI:10.1049/pi-b-2.1960.0151
出版商:IEE
年代:1960
数据来源: IET
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| 12. |
The design of controlled rectifiers using triode transistors |
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Proceedings of the IEE - Part B: Electronic and Communication Engineering,
Volume 107,
Issue 35,
1960,
Page 473-480
E.E.Ward,
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PDF (898KB)
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摘要:
The paper deals with polyphase rectifiers in which the switching element is a complementary combination of ap-n-pand ann-p-ntransistor. The stability conditions for the open and closed states of this switch are investigated graphically, leading to the calculation of the voltage drop when conducting. There is a sharp upper limit to the permissible current. Tests are described on a 3-phase controlled rectifier.
DOI:10.1049/pi-b-2.1960.0152
出版商:IEE
年代:1960
数据来源: IET
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| 13. |
Anode luminescence in oxide-cathode receiving valves |
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Proceedings of the IEE - Part B: Electronic and Communication Engineering,
Volume 107,
Issue 35,
1960,
Page 481-484
H.N.Daglish,
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PDF (687KB)
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摘要:
During life test, Post Office underwater-repeater valves and other receiving-type valves exhibit a blue luminescent pattern on the inner surfaces of the anode. The nature and some of the properties of the luminescent material are examined, and it is concluded that the actual material is barium and/or strontium oxide transferred from the cathode coating during processing.
DOI:10.1049/pi-b-2.1960.0153
出版商:IEE
年代:1960
数据来源: IET
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