CN-224203405-U - Miniaturized single-beam reflection type atomic magnetometer probe and atomic magnetometer

CN224203405UCN 224203405 UCN224203405 UCN 224203405UCN-224203405-U

Abstract

The utility model discloses a miniaturized single-beam reflection type atomic magnetometer probe and an atomic magnetometer, wherein the atomic magnetometer probe comprises a shell, an alkali metal atomic gas chamber, a combined prism, a reflecting mirror and a photoelectric detector, wherein the combined prism is arranged on one side of the alkali metal atomic gas chamber, the reflecting mirror is arranged on the other side of the alkali metal atomic gas chamber, the photoelectric detector is arranged on one side of the combined prism, which is away from the alkali metal atomic gas chamber, the combined prism is used for converting collimated light received by an incident surface into circularly polarized light and transmitting the circularly polarized light to the alkali metal atomic gas chamber through an emergent surface, and the reflecting mirror is used for reflecting pumping light passing through the alkali metal atomic gas chamber back to the alkali metal atomic gas chamber. The utility model obviously improves the absorption optical path of pumping light, realizes secondary polarization, increases the action intensity of pumping light and alkali metal atoms and the equivalent atomic number in a limited area, can realize higher sensitivity at lower temperature, obviously improves the performance of the single-beam atomic magnetometer and is beneficial to miniaturization design.

Inventors

CHEN HAIDONG
LI RUI
WANG GAOWEI

Assignees

国器(德清)传感技术有限公司

Dates

Publication Date: 20260505
Application Date: 20250507

Claims (10)

1. A miniaturized single-beam reflection type atomic magnetometer probe, characterized by comprising the following steps: A housing; An alkali metal atom gas chamber disposed within the housing; A combination prism arranged at one side of the alkali metal atom gas chamber, the combination prism including an exit surface facing the alkali metal atom gas chamber and an incident surface vertically distributed with the exit surface; A reflecting mirror arranged on the other side of the alkali metal atom air chamber and arranged opposite to the emergent surface of the combined prism; the photoelectric detector is arranged on one side of the combined prism, which is away from the alkali metal atom air chamber; The combined prism is used for converting the collimated light received by the incidence surface into circularly polarized light and emitting the circularly polarized light to the alkali metal atom air chamber through the emergent surface, and the reflecting mirror is used for reflecting pumping light passing through the alkali metal atom air chamber back to the alkali metal atom air chamber.
2. The atomic magnetometer probe of claim 1, wherein the combining prism comprises: a polarization beam splitter prism; The linear polaroid is arranged on one side surface of the polarization beam splitter prism, and the incident surface is arranged on one surface of the linear polaroid, which is away from the polarization beam splitter prism; The quarter wave plate is arranged on the other side face of the polarization beam splitter prism, and the emergent face is arranged on one face, away from the polarization beam splitter prism, of the quarter wave plate.
3. The atomic magnetometer probe of claim 2, wherein the polarization splitting prism, the linear polarizer and the quarter wave plate are glued together.
4. The atomic magnetometer probe of claim 1, wherein the mirror is embedded on an inner wall of the housing.
5. The atomic magnetometer probe of claim 1, wherein the photodetector is embedded on an inner wall of the housing.
6. The atomic magnetometer probe of claim 1, further comprising a heating temperature measurement module and a triaxial magnetic compensation coil, the heating temperature measurement module comprising: An oven wrapped outside the alkali metal atom gas chamber; A non-magneto-electric heating circuit for heating the oven; A temperature sensor for detecting the temperature in the oven; wherein the triaxial magnetic compensation coil is arranged in the oven and is used for carrying out magnetic field compensation on the alkali metal atom air chamber.
7. The atomic magnetometer probe of claim 6, wherein the non-magneto-electric heating circuit, the tri-axial magnetic compensation coil, and the drive circuit for the photodetector are integrated on a flexible circuit board that is disposed through the housing.
8. The atomic magnetometer probe of claim 1, further comprising a collimator disposed through the housing, the collimator comprising a collimated light exit end positioned within the housing opposite the entrance face of the combining prism, and a laser light entrance end positioned outside the housing.
9. An atomic magnetometer comprising an atomic magnetometer probe according to any one of claims 1 to 8.
10. The atomic magnetometer of claim 9, further comprising: The laser source is used for emitting laser to the atomic magnetometer probe; The first control module is electrically connected with the laser source and used for controlling the working state of the laser source; and the second control module is used for controlling the working state of the alkali metal atomic gas chamber and receiving the electric signal fed back by the photoelectric detector.

Description

Miniaturized single-beam reflection type atomic magnetometer probe and atomic magnetometer Technical Field The utility model belongs to the technical field of atomic magnetometers, and particularly relates to a miniaturized single-beam reflection type atomic magnetometer probe and an atomic magnetometer. Background An atomic magnetometer is an optical instrument that uses changes in polarization of alkali metal vapors to perform magnetic field measurements. The instrument can operate in a low magnetic shielding environment, and adopts a conventional detector element to realize low-cost multi-channel configuration, and meanwhile, the measurement sensitivity is improved through a gradient detection technology. The non-spin-exchange relaxation (SERF) atomic magnetometer is used as a novel sensor, works in an SERF state, effectively avoids the influence of spin-exchange relaxation, is of the magnetometer type with highest sensitivity aT present, and has the remarkable advantages of being capable of working aT normal temperature, high in spatial resolution, free of dependence on expensive refrigeration equipment, and capable of achieving a theoretical sensitivity of 2aT/Hz 1/2. In the existing single-beam SERF atomic magnetometer, in order to ensure the pumping light and the absorption optical path of alkali metal atoms, the minimum volume of an alkali metal atom air chamber is limited, and meanwhile, the integration level of an internal light source component of the magnetometer is low, so that the existing single-beam SERF atomic magnetometer is difficult to be miniaturized and high in sensitivity, and is unfavorable for engineering application in a magnetocardiography test. Disclosure of utility model The application aims to provide a miniaturized single-beam reflection type atomic magnetometer probe and an atomic magnetometer, which are used for solving the technical problems that the single-beam SERF atomic magnetometer in the prior art is difficult to achieve miniaturization and high sensitivity and is unfavorable for engineering application in a magnetocardiogram test. To achieve the above object, a first aspect of the present application provides a miniaturized single beam reflection type atomic magnetometer probe comprising: A housing; An alkali metal atom gas chamber disposed within the housing; A combination prism arranged at one side of the alkali metal atom gas chamber, the combination prism including an exit surface facing the alkali metal atom gas chamber and an incident surface vertically distributed with the exit surface; A reflecting mirror arranged on the other side of the alkali metal atom air chamber and arranged opposite to the emergent surface of the combined prism; the photoelectric detector is arranged on one side of the combined prism, which is away from the alkali metal atom air chamber; The combined prism is used for converting the collimated light received by the incidence surface into circularly polarized light and emitting the circularly polarized light to the alkali metal atom air chamber through the emergent surface, and the reflecting mirror is used for reflecting pumping light passing through the alkali metal atom air chamber back to the alkali metal atom air chamber. In one or more embodiments, the combining prism includes: a polarization beam splitter prism; The linear polaroid is arranged on one side surface of the polarization beam splitter prism, and the incident surface is arranged on one surface of the linear polaroid, which is away from the polarization beam splitter prism; The quarter wave plate is arranged on the other side face of the polarization beam splitter prism, and the emergent face is arranged on one face, away from the polarization beam splitter prism, of the quarter wave plate. In one or more embodiments, the polarizing beam splitter prism, the linear polarizer, and the quarter wave plate are glued together. In one or more embodiments, the mirror is embedded on an inner wall of the housing. In one or more embodiments, the photodetector is embedded on an inner wall of the housing. In one or more embodiments, further comprising a heating thermometry module and a tri-axial magnetic compensation coil, the heating thermometry module comprising: An oven wrapped outside the alkali metal atom gas chamber; A non-magneto-electric heating circuit for heating the oven; A temperature sensor for detecting the temperature in the oven; wherein the triaxial magnetic compensation coil is arranged in the oven and is used for carrying out magnetic field compensation on the alkali metal atom air chamber. In one or more embodiments, the non-magneto electric heating circuit, the triaxial magnetic compensation coil and the driving circuit of the photodetector are integrated on a flexible circuit board, the flexible circuit board being disposed through the housing. In one or more embodiments, the laser beam splitter further comprises a collimator, wherein the collimator penetrates