Method for measuring atomic transverse relaxation time based on electron resonance phase frequency analysis

Abstract

The invention discloses a method for measuring atomic transverse relaxation time based on an electron resonance phase frequency analysis. In a strong-background magnetic field with almost neglected residual magnetization in a magnetic shielding barrel, a swept-frequency signal that has a bandwidth covering a resonance curve and has an amplitude enabling the resonance curve to have a clear curve under low polarizability is applied in a horizontal direction; an optical swing angle signal of a magnetometer is detected and a spectral analysis is carried out on an outputted signal in a polar coordinate system to obtain a phase frequency response function of the magnetometer; the phase frequency response function is fitted to a corresponding theoretical phase frequency curve of the magnetometer to obtain atomic spinning transverse relaxation time. Because the phase angle is a result obtained by quotient processing of a spinning transverse component, the influence of common coefficient fluctuation is suppressed, so that the phase frequency signal expression is more stable by being compared with amplitude-frequency signal expression. Besides, the theoretical phase frequency curve is not affected by the magnetic induction intensity of the transverse magnetic field and the atomic spinning longitudinal relaxation time, so that complexity of data processing can be reduced. Moreover, a lorenz curve widening risk caused by the transverse magnetic field can be eliminated.

Description

technical field [0001] The invention belongs to the field of measurement and analysis of key performance parameters of atomic magnetometers, and in particular relates to a method for measuring atomic transverse relaxation time based on electronic resonance phase-frequency analysis. Background technique [0002] The atomic spin transverse relaxation time is a key parameter to characterize the performance of an atomic magnetometer, so it needs to be measured. A common and accurate way to measure the transverse relaxation time of atomic spins is to measure the magnetic resonance linewidth of an atomic magnetometer, and then calculate the transverse relaxation time of atomic spins through the magnetic resonance linewidth. At present, the commonly used magnetic resonance linewidth measurement methods mainly include synchronous optical pumping method and electron spin resonance method. The method of synchronous optical pumping uses an optical chopper to modulate the intensity of ...

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Problems solved by technology

However, fitting five parameters at the same time is quite complicated in actual operation, and it is difficult to obtain the transverse relaxation time of atomic spins at low polarizability through amplitude spectrum analysis

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