在无产阶级文化大革命及批林批孔运动的推动下,中国计量科学研究院建成“在弱磁场中测定质子回转磁比(γ_p)”的装置。γ_p 是一个重要的物理常数。由核磁共振原理,在磁场 B 中的质子所对应的共振频率ω=γ_pB。磁场由石英骨架的赫姆霍茨线圈所产生。线圈常数 K Under the impetus of the proletarian cultural revolution and the campaign of criticizing Lin and Pidong, China Institute of Metrology established a device to measure the proton gyrating magnetic ratio (γ_p) in a weak magnetic field. γ_p is an important physical constant. By the principle of nuclear magnetic resonance, the corresponding resonant frequency ω = γ_pB of the proton in the magnetic field B. The magnetic field is generated by the Helmholtz coils of the quartz skeleton. Coil constant K