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Application of High-precision Current Source in Gyro Test

发布:2021-03-03

With the rapid development of the inertial navigation system, the gyroscope is the core of the inertial navigation system, and its performance determines the performance of the inertial navigation system. With the rapid development of modern physics, especially the rapid progress in quantum control and other fields, NMR gyroscopes with 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 of the laser and the alkali metal atoms and noble gas atoms in the nuclear magnetic resonance gas cell to make the nucleus precess at the Larmor frequency, and realizes closed-loop control and alignment of the gas cell magnetic field through the magnetic field drive technology. The residual magnetism is compensated to maintain the resonance state of the nucleus, and then the angular velocity information of the carrier can be detected to realize the function of the gyroscope. Therefore, a high-precision magnetic field drive circuit is the hardware basis for closed-loop control of the magnetic field.

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

Aigtek's ATS-2000C series is a high-precision general-purpose current source. The maximum output current is 3A, the minimum current resolution is 20 pA, and the output accuracy is high. Because the DC magnetic field control accuracy of the main magnetic field of the NMR gyroscope is more precise, the output of the high-precision current source is adopted, which can be adjusted in several gears, and the accuracy can reach 4.5 digits. The adjustment range of the magnetic field is between 0-3A and the accuracy is 0.035%+600 pA.

In order to better evaluate the influence of the magnetic field on the magnetic field applied by the drive circuit for the MRI gyroscope, the magnetic field closed-loop control does not consider the influence of the measurement accuracy of the NMR gyroscope on the gyroscope's nuclear rotation control frequency and gyroscope drift. The influence of the magnetic field on the performance of the gyroscope, according to the accuracy of the main magnetic field, the high-precision current source can be used not only to drive quantum sensors such as atomic gyroscopes and atomic magnetometers, but also to the medical-industrial cross-field, aerospace and precision measurement Such as systems that require high-precision current output control.

Xi'an Antai Electronic Technology Co., Ltd. (Aigtek) is a leading domestic high-tech enterprise engaged in the research and development, production and sales of measuring instruments. Focusing on the research and development of high-voltage amplifiers, power amplifiers, high-precision current sources, high-precision voltage sources, wiring harness testers and other products, breaking the Western technology monopoly and blockade, the products are widely used in the fields of defense, aviation, aerospace and chip research. More than 1,000 scientific research institutions around the world contribute to global scientific and technological progress.

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