Automatic demagnetizing device for cylindrical magnetic shielding of atomic clock

Abstract

Provided is an automatic demagnetizing device for cylindrical magnetic shielding of an atomic clock. An output end of a modulation signal source is connected with a modulation end of a carrier wave signal source. An output end of the carrier wave signal source is connected with an input end of a controlled current loop. An output end of the controlled current loop is connected with a demagnetization current loop. The controlled current loop is formed in such a manner that a driving circuit, a direct-current power supply and an input end of a transformer are connected in series. An input end ofthe driving circuit is connected with the output end of the carrier wave signal source. The demagnetization current loop is formed in such a manner than an output end of the transformer, a knife switch and a demagnetization coil are connected in series. The demagnetization coil winds around a magnetic shielding cylinder. The automatic demagnetizing device for cylindrical magnetic shielding of theatomic clock is advantaged by being simple in structure and convenient in operation and is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of demagnetization equipment, and in particular relates to an atomic clock cylindrical magnetic shield automatic demagnetization device. Background technique [0002] The research of atomic clock needs to add a uniform weak magnetic field (C field) in the atomic interaction area to remove the energy level degeneracy of the atomic ground state and provide the quantization axis of the atomic transition. The size and uniformity of the magnetic field directly affect the performance of atomic clocks. The C field strength of typical atomic clocks (cesium beam clocks, fountain clocks, hydrogen clocks, and spaceborne clocks) is on the order of hundreds of nanotets, and the magnetic field fluctuations in the atomic interaction area are required to be on the order of nanots. Experimentally, if such a weak magnetic field environment is to be generated around the atomic clock device, it is first necessary to shield the...

AI Technical Summary

Problems solved by technology

The power supply of the demagnetization device is 220V, 50Hz mains power. The function of the voltage regulator only changes the intensity of the demagnetization current but cannot change the frequency. Such a single frequency may not be able to obtain the best demagnetization results for magnetic shields with different materials, thicknesses and shapes. , the intensity of the demagnetization current is achieved by sliding the brush of the second voltage regulator on the coil. Generally, the number of coil turns of the voltage regulator is limited, so the intensity of the demagnetization current cannot be adjusted too finely, and the occasional contact between the brush and the coil is poor. It will cause a large change in the demagnetization current, which will have an impact on the magnetic shield

Since the whole demagnetization process is completely completed by manual operation, the demagnetization results are greatly affected by human factors. Different people or even the same person will have different demagnetization results at different times, and sometimes repeated demagnetization is required; and the demagnetization coil is connected to the market through a voltage regulator. Electrically connected, the voltage between the demagnetization coil and the ground is 220V. If a short circuit occurs during the demagnetization process, it will cause an instantaneous increase in the demagnetization current, which will cause irreversible damage to the magnetic shield, and even cause personal injury in severe cases.

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