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Sample text
The radiation is detected by a r e c e i v e r also of impedance R. If the oscillator has angular frequency 60 and is exactly tuned to the resonant circuit, the voltage a c r o s s the detector is 2 >2 /R. where f = 2oo M If, owing to paramagnetic absorption, the s e r i e s r changes by 6 r, the change in the detector voltage is resistance Since f depends on the tightness of coupling into the resonant circuit, we can adjust it by changing the coupling ( i . e . , the value of M). The sensitivity will be greatest when the voltage 6 V% at the detector reaches a maximum, which occurs when r = r\ W e e x p r e s s 6 V 2 in t e r m s of the power P 2, reaching the r e c e i v e r .
Rev. 8 3 , 8 1 2 , 1 9 5 1 . Semenov, A. , N. N. Bubnov. Pribory Tekh. Eksp. No. 1, 92, 1959. England, T. , E. E. Schneider. Nature 166, 4 3 7 , 1 9 5 0 . Strum, P. D. Proc. Inst. Radio Eng. 4 1 , 8 7 5 , 1 9 5 3 . Ingram, D. J. E. Spectroscopy at Radio and Microwave F r e quencies, London, 1 9 5 5 . Gordy, W . Rev. Mod. Phys. 2 0 , 6 6 8 , 1 9 4 8 . Pound, R. V . , W . D. Knight. Rev. Sci. Instr. 2 1 , 2 1 9 , 1 9 5 0 . Weidner, R. , C. A . W h i t m e r . Rev. Sci. Instr. 2 3 , 7 5 , 1 9 5 2 .
3) With the resonant cavity assumed previously, at Q0 = 5000 and X = 3 c m , at N = 1 0 , df- 1 c p s , and oscillator power of 40 mw and 28 II. 3 M E T H O D S OF M E A S U R E M E N T V = 2 - 3 c m , the theoretical minimum value of y ' m i n is approxi13 mately 1 ( T at room temperature. 5 • 1 0 " mole of paramagnetic particles with 5 = 1 / 2 (at 3 0 0 ° K ) . Actually the sensitivity which can be achieved in the apparatus, as a rule, is much lower than this value and depends greatly on many factors, in particular on the applied frequency and on the method of measuring the signal.