Capacitive frequency meter

1979 ◽  
Vol 22 (6) ◽  
pp. 738-739
Author(s):  
B. A. Kaznacheev
Keyword(s):  
Capacitive Frequency ◽  
Frequency Meter

Semiconductor capacitive frequency meter

1963 ◽  
Vol 6 (5) ◽  
pp. 417-421
Author(s):  
V. I. Safonov ◽  
I. N. Ivanov ◽  
V. N. Komissarova
Keyword(s):  
Capacitive Frequency ◽  
Frequency Meter

Nonlinearity of transistor capacitive frequency meter

1969 ◽  
Vol 12 (1) ◽  
pp. 81-84
Author(s):  
K. I. Didenko ◽  
V. N. Laskavyi
Keyword(s):  
Capacitive Frequency ◽  
Frequency Meter

Fast-sampling frequency meter

1978 ◽  
Vol 14 (12) ◽  
pp. 366 ◽  
Author(s):  
M.J. Underhill ◽  
M. Sarhadi ◽  
C.S. Aitchison
Keyword(s):  
Sampling Frequency ◽  
Frequency Meter

A microprocessor-based precision three-channel high-speed frequency meter with a zero dead time

2007 ◽  
Vol 50 (2) ◽  
pp. 215-220 ◽  
Author(s):  
A. M. Goncharenko ◽  
V. A. Zhmud’ ◽  
A. A. Voevoda ◽  
S. A. Avilov
Keyword(s):  
High Speed ◽  
Dead Time ◽  
Frequency Meter

scholarly journals A Stress Measurement Method for Steel Strands Based on LC Oscillation

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Dongjun Chen ◽  
Benniu Zhang ◽  
Xingxing Li ◽  
Chong Tu ◽  
Can Yuan ◽  
...  
Keyword(s):  
Prestressed Concrete ◽  
Oscillation Frequency ◽  
Stress Measurement ◽  
Resonant Circuit ◽  
Electromagnetic Signal ◽  
Prestress Loss ◽  
Factors Affecting ◽  
Existing Structures ◽  
Detection Circuit ◽  
Frequency Meter

The prestress loss is one of the main factors affecting the safety of prestressed concrete structure. While the detecting signals like sound and light are difficult to spread in steel strands, there is no effective method for prestress detection of the bonded prestressed steel strands in existing structures yet. In this paper, taking into consideration that the electromagnetic oscillation characteristic can make the signal propagate effectively on the bonded prestressed steel strands, a nondestructive prestress detection method based on the electromagnetic effect to detect oscillation frequency is proposed. In a detection circuit, the steel strands are simulated as an inductance component, in which an induced electromagnetic signal passes through the steel strands to form resonance. And then, a frequency meter is used to detect the oscillation frequency of the resonant circuit. The oscillation frequency is supposed to have relationship with the prestress loading on the steel strands. A section of steel strands with a length of 1.2 m is adopted to test the correlation of stress and oscillation frequency. Both the theoretical and experimental results show that the resonant frequency of the circuit decreases with the increase of the stress of the strand and is linear in a certain range.

Transistor frequency meter for measuring the thickness and growth rate of films

1973 ◽  
Vol 16 (5) ◽  
pp. 732-734
Author(s):  
V. T. Nikolaev ◽  
V. N. Chernyaev
Keyword(s):  
Growth Rate ◽  
Frequency Meter

SOME RESULTS OF AEROMAGNETIC SURVEYING WITH A DIGITAL CESIUM‐VAPOR MAGNETOMETER

Geophysics ◽  
1965 ◽  
Vol 30 (5) ◽  
pp. 883-890 ◽  
Author(s):  
Raoul I. Giret
Keyword(s):  
Magnetic Field ◽  
Optical Pumping ◽  
Digital Data ◽  
Cesium Vapor ◽  
Ground Station ◽  
Digital Frequency ◽  
Record Data ◽  
Frequency Meter ◽  
Magnetic Record ◽  
The Magnetic Field

This magnetometer has been developed by C.S.F. (Compagnie Générale de Télégraphie Sans Fil) and C.G.G. (Compagnie Générale de Géophysique). The magnetic field is measured by an optical pumping sensor giving a frequency proportional to the field. A digital frequency‐meter delivers a reading each second with a sensitivity of ± one period (31.5 periods for one gamma). These readings are recorded on a magnetic tape recorder and on an analog TEXAS recorder. The digital data are processed on a 1620 IBM. During the flight a second magnetometer records the variation of the earth’s field in a ground station located in the center of the area surveyed. The ground record data are subtracted from the airborne data. The following data obtained with this equipment are presented: Analog record with a sensitivity of one gamma for two mm. Restitution with 1620 IBM and CALCOMP of the magnetic record to an analog record with a sensitivity of one gamma for one cm. Isogam maps with a contour interval of one gamma and some intermediate contours at 0.5 gamma.

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