| 摘要 |
PURPOSE:To enable the maintaining of a high sensitivity, by mounting an aperture made up of a non-magnetic body having openings required for parallel light portions of a light beam in such a manner as to be finely adjusted within a plane at the right angle to the optical axis. CONSTITUTION:Apertures 12 are mounted between absorption cells 4 and lenses 2 in such a manner as be finely adjusted within a plane at the right angle to optical axis. Then, spectral lights from a light source lamp 1 are introduced to the apertures 12 through optical fibers 11, lenses 2, circular polarization plates 3 and the absorption cells 4. Here, the apertures 12 are allowed to make a photomagnetic resonance curve almost axially symmetrical in clockwise and counter-clockwise circular polarization systems. Output lights from the apertures 12 are converted into electrical signals with a photo detector 5 through the lenses 2 and optical fibers 11 and added up with an adder 7 through six amplifiers 6. A signal processor 8 sends out a specified signal to three pairs of RF coils 9 set near three pairs of cells 4 by a signal from the adder 7. The system thus obtained is made to lock-on at the optimum point of a photomagnetic resonance and a lock-on frequency is sent outside as output signal.
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