New PDF release: Electron Spin Resonance Spectrometers
By T. H. Wilmhurst
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Extra info for Electron Spin Resonance Spectrometers
The variation of OY is shown in Fig. 17(b). Fig. 17 is drawn for the normal phase relationship between signal and bucking components where the intention is to suppress dispersion. The effects of using this and the three other principle phase relation- Qx (a) (b) fci 0-~-- d. ctor diagram Display Fig. 18. Effect of altering the phase of the bucking signal in a reflection-cavity spectrometer upon the observation of absorption and dispersion. ships are shown in Figs. 18(a-d). Thus in (b) and (d) the phase relationship is shifted by ± 900 to give suppression of absorption and observation of dispersion, whilst (c) simply reverses the sign of the absorption signal; (e) is an intermediate phase relationship which mixes both absorption and dispersion.
This point is discussed in Chapter 4. The compromise circuit of Fig. R. spectrometer circuit of Fig. 4. The generator is equivalent to the klystron and the section of waveguide to which it is connected and matched, the resonant circuit to the cavity resonator, and the load to the microwave detector ancl the section of waveguide to which it is connected and matc~ed. The mutual inductances correspond to the coupling holes in the irises. It thus becomes apparent that this arrangement, known as the transmission-cavity spectrometer, can be improved by using the microwave equivalent of Fig.
6. The fluctuation can be removed by a low-pass filter. Strictly, one should write the input signal as vin sin(wt + ¢P), where ¢P is the phase angle between the input signal and the switching function h(t). c. cos ¢P and so the detector is truly phase-sensitive. If the phase shifter is adjusted properly, the angle ¢P is zero, so the term cos cpP is equal to unity and can be omitted. 25), the frequency of the input signal f is also subject to a small spread, which is transferred to the nominally-zero-frequency component at the output.
Electron Spin Resonance Spectrometers by T. H. Wilmhurst