3) Excitation oscillator contains less than 1 per cent second harmonic, which in turn is attenuated 80 dB by filtering. ... wave it is possible to get a pure sine wave second harmonic output which greatly increases the signal-to-noise ratio of ... 4) A description of the helical core sensor is given together with circuit diagrams of the electronics. ... 2, 560, 132, July 10, 1951. ... Serson, P.H., and W.L.W. Hannaford.
|Title||:||Publications de la Direction de la Physique Du Globe|
|Author||:||Canada. Earth Physics Branch|