The application of low-noise DC-DC power source in fiber-optic gyroscope system

Chen Xian; Yang Jianhua; Zhou Yilan; Shu Xiaowu

doi:10.12086/oee.2018.170517

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Chen Xian, Yang Jianhua, Zhou Yilan, et al. The application of low-noise DC-DC power source in fiber-optic gyroscope system[J]. Opto-Electronic Engineering, 2018, 45(1): 170517. doi: 10.12086/oee.2018.170517

Citation:

Chen Xian, Yang Jianhua, Zhou Yilan, et al. The application of low-noise DC-DC power source in fiber-optic gyroscope system[J]. Opto-Electronic Engineering, 2018, 45(1): 170517. doi: 10.12086/oee.2018.170517

The application of low-noise DC-DC power source in fiber-optic gyroscope system

1.
College of Optical Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China
2.
State Key Laboratory of Modern Opitical Instrumentation (Zhejiang University), Hangzhou, Zhejiang 310027, China

More Information

Corresponding author: Yang Jianhua, E-mail: xxianhua@zju.edu.cn

Received Date 25 September 2017

Revised Date 08 December 2017

Published Date 15 January 2018

Abstract

Abstract

In high-precision fiber-optic gyroscope (FOG) system, the spike noise of DC-DC power source can lead to a considerable disturbance to the signal processing circuit of FOG, which results in a sampling error. In this work, the cause of spike noise and the influence mechanism were clarified. The slew rate control technology was researched and proved to be an effective solution to prevent spike noise of FOG power source. Using slew rate control technology, a kind of low-noise power module has been developed and applied successfully in the FOG system. This power module consists of DC-DC circuit and LDO circuit, and slew rate control circuit was used in the DC-DC circuit to realize low-noise performance. The peak-to-peak noise value of the developed power module was tested to be about 1 mV in a bandwidth of 200 MHz. Two typical FOG systems were tested with the use of this low-noise power source, and their output noise improvement were 3.1% and 4.4%.
- fiber-optic gyroscope /
- DC-DC converter /
- spike noise /
- slew rate control

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References

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Overview

Overview

Overview: The fiber-optic gyroscope (FOG), is a precise angular velocity sensor. In its work, weak electrical signal has been produced and acquired, so noise of power supply may interfere in the circuit of FOG and reduce its performance. DC-DC converter is normal power supply of FOG, and its noise can be divided into two parts, ripple wave and spike noise. The ripple wave is easy to be reduced by power filter, but spike noise is hard to be suppressed because of its high frequency and radiation characteristic. The spike noise can interfere into the signal acquisition circuit and mix into acquisition result due to the spectrum aliasing. Spurious triggering of FOG digit circuit may also come out as a result of serious spike noise. The spike noise comes from high harmonic signals of switch devices. Switch devices generate square wave signal and its spectrum covers form low frequency to high frequency. The signals above the order of 10 MHz always remains after rectification and filtration and spike noise is combination of these high harmonic signals in time domain. So preventing the generation of high harmonic signals is the key to reduce spike noise. Soft-switching technology can be used to reduce spike noise but the result is still unsatisfactory. Slew rate control technology is a good way to reduce and eliminate spike noise. Slew rate determines the bandwidth of signal, and less high harmonic signals will be generated if slew rate has been controlled as expected. So slew rate control is the suitable technical route for low-noise power supply for FOG system. After taking use of slew sate controlled DC-DC Controller, the low noise power module has been designed and developed. The power module consists of DC-DC circuit and LDO circuit, and the slew rate of DC-DC circuit has been controlled so that the spike noise was eliminated successfully. The oscilloscope with analog bandwidth of 200 MHz was used to test the noise characteristic of the developed power module, and the peak-to-peak noise value was tested to be about 1mV in the full bandwidth, which is obviously low compared with the normal DC-DC converter. Experiment has been designed to test the performance of FOG system after using the low noise power module. Two typical FOG products were tested, and the noise performance improvement of FOG output was 3.1% and 4.4%. A conclusion can be drawn that low-noise power module is beneficial for the performance of FOG.