Study on the technology of the first kind of dispersion equalization for four frequency differential laser gyro

Abstract

The frequency stabilization error is an important error for four frequency differential laser gyro (FFDLG). The first kind of dispersion equalization technology (FKDET) can minimize the frequency stabilization sensitivity of FFDLG essentially. From the independent dual-gyro approximation model, the principle and physical picture of FKDET are analyzed. Basing on the analysis, the calibration algorithm is put forward. At last the experimental system is set up. Experimental results show that the frequency stabilization sensitivity of FFDLG can be reduced more than 300 times by using FKDET. The startup and long term drift are also decreased of 0.00396 and 0.00152 respectively. Under temperature environment between −40 °C ∼ 60 C, the drift difference is reduced at least 0.6 by using FKDET. Therefore, FKDET is helpful to improve the performance of FFDLG for practical engineering application.