Application of high-precision current source in gyroscope testing

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Application of high-precision current source in gyroscope testing [Copy link]

With the rapid development of inertial navigation systems, gyroscopes, as the core of inertial navigation systems, determine the performance of inertial navigation systems. With the rapid development of modern physics, especially the rapid progress in fields such as quantum control, nuclear magnetic resonance gyroscopes, which have the advantages of high precision, small size, low power consumption and low cost, have become an important research direction.

The nuclear magnetic resonance gyroscope (NMRG) uses the interaction between laser and alkali metal atoms and inert gas atoms in the nuclear magnetic resonance gas chamber to make the nuclei precess at the Larmor frequency, and uses magnetic field driving technology to achieve closed-loop control of the gas chamber magnetic field and compensate for the residual magnetism to maintain the resonance state of the nuclei, thereby being able to detect the angular velocity information of the carrier and realize the function of the gyroscope. Therefore, a high-precision magnetic field driving circuit is the hardware foundation for the closed-loop control of the magnetic field.

As an important part of magnetic field closed-loop control, magnetic field driving technology directly affects the magnetic field control accuracy and stability of the nuclear magnetic resonance gyroscope. The types of magnetic field driving circuits include voltage source and current source, which require high-precision DC current output for residual magnetism compensation in magnetic shielding and isolation of the influence of magnetic field on nuclear spin measurement. In the nuclear magnetic resonance gyroscope, a three-axis vector atomic magnetometer is constructed using a magnetic resonance gas chamber. By applying a certain current to the three-dimensional coil, the residual magnetic field after passive magnetic shielding is compensated. The magnetic field driving circuit is used to apply the corresponding current to the three-dimensional coil.

Aigtek's ATS-2000C series is a high-precision universal current source . It can output a maximum current of 3A, with a minimum current resolution of 20 pA and high output accuracy. Since the DC magnetic field control accuracy of the main magnetic field of the nuclear magnetic resonance gyroscope is more precise, a high-precision current source output is used, which is divided into several adjustable gears with an accuracy of up to 4.5 digits, making the magnetic field adjustment range between 0-3A and an accuracy of 0.035%+600 pA.

In order to better evaluate the influence of the magnetic field on the magnetic field applied by the driving circuit for the nuclear magnetic resonance gyroscope, the influence of the measurement accuracy of the nuclear magnetic resonance gyroscope on the nuclear rotation control frequency and gyroscope drift of the gyroscope is not considered in this magnetic field closed-loop control, and the influence of the z-axis main magnetic field on the gyroscope performance is mainly investigated. According to the main magnetic field accuracy, the high-precision current source can be used not only to drive quantum sensors such as atomic gyroscopes and atomic magnetometers, but also in systems that require high-precision current output control in the medical and engineering intersection field, aerospace field, and precision measurement field.

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Thanks for sharing, I learned a lot.