Dispersion And Gas Flow Effects In The Ring Laser Gyro

Aronowitz, F.; Lim, W. L.

doi:10.1117/12.7972388

Cited by 6 publications

(4 citation statements)

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“…ψ is the Sagnac phase difference between two laser beams. r 1 A 1 and r 2 A 2 are the amplitudes of the backscattered beams from the mirror with the phase shifts β 1 and β 2 with respect to the main laser beams A 1 and A 2 , respectively [3,5]. These backscattered beams cause the phase change ψ * , as shown in figure 1.…”

Section: The Rlg Lock-in and Phase Errorsmentioning

confidence: 99%

“…In ring laser gyroscopes (RLGs), two counter-propagating laser beams have a relative phase difference under the rotation of the body frame caused by the Sagnac effect [1][2][3]. This leads to a difference in the optical resonant frequency proportional to the input rotation rate.…”

Section: Introductionmentioning

confidence: 99%

“…This leads to a difference in the optical resonant frequency proportional to the input rotation rate. When the rotation rate is too low, however, this difference does not occur due to the backscatter from the mirrors, called a 'lock-in' [3][4][5]. Since the RLG cannot provide any information on the input rotation when experiencing a lock-in, this needs to be overcome.…”

Section: Introductionmentioning

confidence: 99%

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New random walk reduction algorithm in ring laser gyroscopes

Song

Lee

Hong

et al. 2010

J. Opt.

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The main factors which reduce the performance of ring laser gyroscopes (RLGs) are lock-ins and bias errors. A lock-in is a nonlinear effect that makes the output of the RLG unmeasurable due to a coupling with the backscattered light from the mirror when the input rotation rate is low. To prevent the lock-in effect, random dithering has been applied. However, a random walk due to the random dithering can result in a degraded RLG performance. Thus, a lower value for random walks is preferable. This is done by reducing the alignment time of the Laser Inertial Navigation System (LINS). In this paper, we propose a new algorithm that is used to estimate the phase errors due to lock-ins and so compensates for a random walk using the electric output of the RLG. To verify the performance of the proposed algorithm, a simulation was performed using RLG equations. The simulation results show that the proposed algorithm significantly reduces random walks and brings robustness to the timer clock frequency, which can lead to an easier implementation of hardware and algorithms.

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Section: The Rlg Lock-in and Phase Errorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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New random walk reduction algorithm in ring laser gyroscopes

Song

Lee

Hong

et al. 2010

J. Opt.

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“…Null shift happens when the frequency difference is nonzero for zero input rate, it can be corrected by temperature compensation techniques and other composite signals compensation techniques based on least squares support vector machine [19]- [22]. Studies have shown that the change of light intensity is closely related to the scale factor error and null shift [23]- [25]. The light intensity stability is an important factor affecting the performance of laser gyro [26], [27].…”

Section: Introductionmentioning

confidence: 99%

A Method for Improving Light Intensity Stability of a Total Reflection Prism Laser Gyro Based on Series Correction and Feedforward Compensation

Tao

et al. 2020

IEEE Access

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The instability of scale factor and null shift are closely related to the change of the light intensity of a total reflection prism laser gyro (TRPLG). To improve the light intensity stability, the light intensity stabilization principle of TRPLG was analyzed, and a mathematical model of light intensity stabilization system was established. Aiming at the problem that original system has a long adjustment time, a series correction method of adding a proportional integral differential (PID) link in the forward channel was adopted. According to the third-order optimal design, the original I-type third-order overdamped system was optimized to the new II-type third-order underdamped system, which ultimately improved the system's dynamic and steady-state performance. Feedforward compensation was used to introduce the light intensity disturbance during the longitudinal mode hopping into the closed-loop system, which realized the full compensation of the light intensity error and improved the light intensity characteristics during the longitudinal mode hopping. Combined with the above two methods, experimental results showed that the new system with feedforward compensation improved the light intensity stability by 32% at constant temperature and by 40% at variable temperature, with the TRPLG's bias stability improved by more than 16% at constant temperature and by 22% at variable temperature.

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