Method and device for detecting atomic group density to determine atomic beam flux

The invention discloses a method and a device for detecting atomic group density to determine atomic beam flux, and belongs to the field of cold atom interference physics. The atomic spatial resolution is detected by acquiring data of a plurality of positions of a narrow detection beam which only interacts with a small part of atomic flux, the atomic group density is measured by adopting an absorption method, and atomic spatial density distribution is acquired in a preset height range; therefore, the atomic spatial resolution information is obtained, and the atomic beam flux is finally obtained. When total absorption experienced by a detection beam passing through flux is measured, the problem of depth of field does not exist, an atomic column density profile can be constructed by performing multiple measurements at different positions, measurement process complexity caused by non-uniformity of a Gaussian detection beam and instability of detection light intensity is effectively avoided, and the method has re