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Application of high-precision current source in gyroscope test

阅读: 发布:2020-12-29

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.

Nuclear magnetic resonance gyroscope (NMRG) uses the interaction of laser and alkali metal atoms and noble gas atoms in the nuclear magnetic resonance gas chamber to make nuclei precess at the Larmor frequency, and achieves closed-loop control and alignment of the magnetic field of the gas chamber through 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 used as the hardware basis for closed-loop magnetic field control.

As an important part of closed-loop magnetic field control, 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 influence of magnetic field 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 Current.

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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 NMR gyroscope, the magnetic field closed-loop control does not consider the influence of the NMR gyroscope measurement accuracy on the gyroscope's nuclear rotation control frequency and gyroscope drift, and mainly investigates the main z-axis The influence of the magnetic field on the performance of the gyroscope is based on 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-industry cross-field, aerospace and precision measurement fields. 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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