Methods for determining the synchronization threshold of counter-propagating waves in a small-sized laser gyroscope

Control and navigation systems


Аuthors

Borisov M. V.1*, Zakharov M. A.2**, Chernomorskii A. I.***, Chirkin M. V.3****

1. Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia
2. Moscow Institute of Electro-mechanics and Automatics, 5, Aviation Lane, Moscow, 125319, Russia
3. Ryazan State Radio Engineering University, 59/1, Gagarin Str., Ryazan, 390005, Russia

*e-mail: borisovu.m@gmail.com
**e-mail: mihzakharov@yandex.ru
***e-mail: chernomorsсky@yandex.ru
****e-mail: chirkin.m.v@rsreu.ru

Abstract

Abstract
Different methods for determining the synchronization threshold of counter-propagating (STCPW) waves in a small-sized laser gyroscope (SSLG) are presented which allow to determine this parameter along all product life cycle and to minimize it during operation.
Purpose
The purpose of the paper is search for the most easy- to-realize, accurate, and convenient methods for determination of STCPW at all stages of product manufacturing and operation.
Design/methodology/approach
Prediction of the laser gyroscope STCPW value was carried out by analysis of mirror and mirror substrate surface roughness via atomic-force microscope.
Measurement of this parameter was performed on the base of the following methods. 
1. Measuring method of STCPW on the base of SSLG output information signal estimation against its angular velocity. 
2. Measuring method of STCPW on the base of SSLG output information signal estimation against vibrating support oscillation magnitude. 
3. Measuring method of STCPW on the base of algorithmic processing of SSLG output information signal. 
4. Measuring method of STCPW on the base of analysis of SSLG scale factor dependence on its angular velocity.
Minimization of this parameter during the operation period is performed by selection of the operating mode. The criterion for operating mode selection was value of modulation depth of radiation intensity at the difference frequency.
Findings
On the stage of incoming inspection of SSLG OEM components authors found out promising technique of prediction of the laser gyroscope STCPW value by analysis of mirror and mirror substrate surface roughness via atomic-force microscope. In respect to the SSLG assembly step authors demonstrated capability of SSLG determination on the base of algorithmic processing of SSLG output information signal as early as on the stage of electrovacuum processing of ring resonator for its performance evaluation. At the operation stage method of selection of the SSLG operating mode is rather promising for STCPW minimization.
Originality/value
On the base of analysis of existing methods of direct and indirect STCPW determination authors have developed the most promising methods of STCPW prediction and determination along all stages of SSLG life cycle. Principles of operation of measuring benches for STCPW prediction and measurement are described.

Keywords:

small-sized laser gyro, synchronization threshold counter-propagating waves of laser gyro, width of locking band, coupling coefficients, backscattering

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