Electron paramagnetic resonance (EPR) spectrometer

Details Electron paramagnetic resonance (EPR) spectrometer Electron paramagnetic resonance (EPR) spectrometer

1988-08-02

1989-12-19

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using an electron resonance spectrometer system

G01R 3320

Patent

active

048885541

ABSTRACT:
An electron paramagnetic resonance (EPR) spectrometer employing a reference arm microwave bridge provides efficient, simultaneous generation of orthogonal I and Q signals. The simultaneous generation is enabled through the use of a field effect transistor (FET) microwave amplifier in the signal arm feeding a balanced quadrature mixer. The I and Q signals are then combined to produce a signal suitable for use as a discriminator in an automatic frequency control (AFC) circuit. An important characteristic of the discriminator signal is that it is independent of the relative phase angle .alpha. between the reference arm and signal arm of the bridge. In a further embodiment, an apparatus is disclosed which computes .alpha. from the I and Q signals, and uses the computed value for .alpha. to extract pure absorption and pure dispersion information from the I and Q signals regardless of the setting of .alpha. in the bridge.

REFERENCES:
patent: 3350633 (1967-10-01), Hyde
patent: 3820035 (1974-06-01), Meddaugh
patent: 3824451 (1974-07-01), Freeman et al.
patent: 3873909 (1975-03-01), Ernst
patent: 4593248 (1986-06-01), Hyde et al.
patent: 4623835 (1986-11-01), Mehdizadeh
patent: 4782296 (1988-11-01), Schmalbein
Electron Spin Resonance, Second Edition, A Comprehensive Treatise on Experimental Techniques by Charles P. Poole, Jr., pp. 87-92.

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