Topic
Ring laser gyroscope
About: Ring laser gyroscope is a research topic. Over the lifetime, 2070 publications have been published within this topic receiving 18609 citations. The topic is also known as: Sagnac interferometer.
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Patent•
28 Feb 1995
TL;DR: In this paper, the authors proposed a method for damping feedback components of the laser light originating outside the fiber ring resonator, which is based on the discovery of the causes of frequency fluctuations and, consequently, provides means for the damping of feedback components.
Abstract: A Brillouin ring laser gyro has a fiber ring resonator, which exhibits a sequence of resonance frequencies, neighboring resonance frequencies differ by a free spectral range. Two pump laser waves of opposite directions are generated. The frequency difference of these pump laser waves is an integral multiple of the free spectral range of the fiber ring resonator. The frequencies of the pump laser waves coincide with resonance frequencies of the fiber ring resonator. Due to stimulated Brillouin scattering, two Brillouin ring lasers having opposite directions of propagation are excited. Frequency fluctuations occur with such two-color ring laser gyros. The invention is based on the discovery of the causes of such frequency fluctuations and, consequently, provides means for the damping of feedback components of the laser light originating outside the fiber ring resonator. Various examples of such means are disclosed.
11 citations
TL;DR: In this article, the application of the vector modulation method (VMM) to an open-loop interferometric fiber optic gyroscope, called the north finder capability (NFCG), was presented.
Abstract: This paper presents the application of the vector modulation method (VMM) to an open-loop interferometric fiber optic gyroscope, called the north finder capability gyroscope (NFCG), designed and assembled in TUBITAK UME (National Metrology Institute of Turkey). The method contains a secondary modulation/demodulation circuit with an AD630 chip, depending on the periodic variation of the orientation of the sensing coil sensitive surface vector with respect to geographic north at a laboratory latitude and collection of dc voltage at the secondary demodulation circuit output in the time domain. The resultant dc voltage proportional to the first-kind Bessel function based on Sagnac phase shift for the first order is obtained as a result of vector modulation together with the Earth's rotation. A new model function is developed and introduced to evaluate the angular errors of the NFCG with VMM in finding geographic north.
11 citations
Patent•
06 Oct 2005TL;DR: In this paper, the authors proposed the laser cavity optical architecture based on the scale factor global conservation, wherein each parameter is temperature variable and several digital examples proving that inventive principles are applicable to standard materials are also disclosed.
Abstract: The invention relates to solid-state laser gyroscopes for measuring rotational speeds or angular positions which are used, in particular for aircraft engineering. A gyroscope performances depend on the temperature stability of the scale factor thereof (S) which is 4A/μL, wherein L and A are the optical length and the area of the laser cavity, respectively and μ is a laser emission mean wavelength without the Sagnac effect. Conventionally, for gas lasers, each parameter of the scale factor is selected in such a way that it is temperature independent. The solid state lasers which are very different from the gas lasers are not treatable in the same manner. Said invention offers the laser cavity optical architecture based on the scale factor global conservation, wherein each parameter is temperature variable. An architecture which makes it possible to avoid optical mode hopes and several digital examples proving that inventive principles are applicable to standard materials are also disclosed.
11 citations
Patent•
11 Jun 2014
TL;DR: Optical gyroscope devices and methods based on optical interferometric configurations to minimize optical loss and enhance the device energy efficiency are discussed in this paper, where the authors use optical polarization control to reduce the optical loss in routing light to and from an optical ring.
Abstract: Optical gyroscope devices and methods based on optical interferometric configurations to minimize optical loss and enhance the device energy efficiency. In one implementation, optical polarization control is provided in an optical gyroscope to reduce the optical loss in routing light to and from an optical ring that senses the rotation.
11 citations
TL;DR: In this article, the dither frequency in a null-biased laser gyroscope is explored both analytically and experimentally, and the agreement between theory and experiment is excellent.
11 citations