Structural and functional synthesis of the continuous wave NQR temperature sensor with increased conversion linearity.

The paper describes development of the detailed structure and circuit diagrams of the continuous wave NQR temperature sensor with increased conversion linearity. It is experimentally established that at amplitude modulation of 40% and change of input voltage in the range of 20-1000 ​mV, the circuit of a symmetric marginal oscillator with a linear active demodulator provides better linearity of transfer characteristic than the circuits of asymmetric marginal oscillators with JFET or diode detectors. As a thermometric substance of the proposed NQR sensor, copper oxide CuO was used, which is characterized by a strong temperature dependence of the resonance frequency of Cu NQR. In contrast to Cl NQR in KClO, for cuprous oxide the temperature dependence of Сu NQR frequency in the frequency range 26.621-25.658 ​MHz is linear in the temperature range 100-390 ​K. It is experimentally confirmed that the use of a low mass sample (less than 200 ​mg) as a thermometric substance of the proposed NQR sensor is quite sufficient for successfully observation of the resonance line at the SNR equal to 9.1 ​dB.