发明名称 OPTICAL FIBER MEASURING DEVICE, GYROMETER, CENTRAL NAVIGATION AND STABILIZING SYSTEM
摘要 The invention relates to a fibre optic measuring device of the type in which the change in a measured parameter generates a phase difference between two waves in a SAGNAC ring interferometer (2). Electronic means (7) comprise a processing system (9) delivering a signal depending on the measured parameter and electronic means (12) controlling the phase modulator (4). The electronic means (12) produce a control signal for the modulator determined in such a way that the phase difference 54m which it produces between the counter-propagating waves periodically takes the following four successive values: .delta.~1 = .delta.o .delta.~3 = a~o .delta.~2 = - .delta.o .delta.~4 = - a~o where ~o is a constant phase shift and it depends on a, and a is a positive constant satisfying the condition: cos~o = cosa~o. The gain of the channel for controlling the modulation is kept constant by producing a signal depending on the said gain by exploiting the four values x1, x2, x3, x4 delivered in response to a period of the modulation signal according to the expression (x1 + x3) -(x2 + x4), the said signal acting on the modulator in such a way as to keep the gain constant.
申请公布号 CA2030131(C) 申请公布日期 2002.02.12
申请号 CA19902030131 申请日期 1990.11.16
申请人 LEFEVRE, HERVE;MARTIN, PHILIPPE 发明人 LEFEVRE, HERVE;MARTIN, PHILIPPE
分类号 G01C19/72;G01R29/08;G01R33/032;H01S3/083;(IPC1-7):G01C19/72 主分类号 G01C19/72
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