US 12,189,008 B1
Atomic beam magnetic resonance method and system based on combined separated oscillatory fields
Fuyu Sun, Xi'an (CN); Chao Li, Xi'an (CN); and Shougang Zhang, Xi'an (CN)
Assigned to National Time Service Center, Chinese Academy of Sciences, Xi'an (CN)
Filed by National Time Service Center, Chinese Academy of Sciences, Xi'an (CN)
Filed on Aug. 20, 2024, as Appl. No. 18/809,338.
Claims priority of application No. 202410221678.6 (CN), filed on Feb. 28, 2024.
Int. Cl. G01R 33/46 (2006.01); G04F 5/14 (2006.01); H03L 7/26 (2006.01)
CPC G01R 33/4625 (2013.01) [G04F 5/14 (2013.01); H03L 7/26 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An atomic beam magnetic resonance method based on combined separated oscillatory fields (SOFs), comprising:
step 1, generating, by an atomic beam source, two identical atomic beams;
step 2, performing atomic state purification treatment on the two identical atomic beams to generate two identical state-purified atomic beams;
step 3, exciting, by zero-phase-difference SOFs, one of the two identical state-purified atomic beams to perform atomic beam magnetic resonance to thereby obtain a first atomic beam magnetic resonance signal; and exciting, by π-phase-difference SOFs, the other of the two identical state-purified atomic beams to perform atomic beam magnetic resonance to thereby obtain a second atomic beam magnetic resonance signal, wherein the zero-phase-difference SOFs and the π-phase-difference SOFs have the same interaction length, the same drift length, and the same oscillatory field strength; and
step 4, performing subtraction operation on the first atomic beam magnetic resonance signal and the second atomic beam magnetic resonance signal to thereby generate a combined Ramsey magnetic resonance signal, wherein a Ramsey transition probability function describing the combined Ramsey magnetic resonance signal is expressed as:

OG Complex Work Unit Math
 where τ represents a duration of interaction between an atom and an oscillatory field; l represents the interaction length; ƒ(τ) represents an interaction duration distribution function; b represents a strength of the oscillatory field; Δ=ω−ω0, ω represents an angular frequency of the oscillatory field, and ω0 represents an atomic transition angular frequency; and T represents a free drift duration of the atom in an oscillatory field-free region of a length L.