Nuclear resonance-absorption thermometer

Details Nuclear resonance-absorption thermometer Nuclear resonance-absorption thermometer

G - Physics

01

N

324/1

G01N 22/00 (2006.01) G01K 7/38 (2006.01)

Patent

CA 1061865

Abstract of the Disclosure The present invention relates to resonance thermometers utilizing nuclear quadruple resonance, nuclear magnetic resonance or like resonance- absorption phenomenon. The resonance thermometer of the invention includes an oscillator for detecting a resonance in a resonant material and a modulator for modulating the oscillation frequency of the oscillator at a low frequency. A first detecting detector formed as a lock-in amplifier with a short time constant detects with low accuracy a component from the modulated output of the oscillator causing a high speed sweep to be stopped. A second detector formed as a lock-in amplifier with a long time constant them detects with high accuracy the component from the modulated output of the oscillator. The output of the second detector, and the temperature is derived from the detected resonance-absorption frequency.

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