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 Cu₂O was used, which is characterized by a strong temperature dependence of the resonance frequency of ⁶³Cu NQR. In contrast to ³⁵Cl NQR in KClO₃, for cuprous oxide the temperature dependence of ⁶³Сu 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.

本文描述了具有增加的转换线性度的连续波NQR温度传感器的详细结构和电路图的开发。实验确定，在幅度调制为40％且输入电压变化在20-1000 mV的范围内时，具有线性有源解调器的对称边缘振荡器的电路比非对称边缘振荡器的电路具有更好的线性传递特性带有JFET的振荡器或二极管检测器。作为所提出的NQR传感器的测温物质，使用了氧化铜Cu ₂ O，其特征在于⁶³ Cu NQR的共振频率具有很强的温度依赖性。与KClO _3中的³⁵ Cl NQR相反，对于氧化亚铜的温度依赖性⁶³在频率范围СuNQR频率26.621-25.658兆赫是在温度范围100-390 K.线性 实验证实，使用低质量的样品（小于200 mg）作为拟议的NQR传感器的测温物质足以成功观察SNR等于9.1 dB的共振线。