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•
23 Feb 2001
TL;DR: In this paper, a multiply encirclement ring resonator formed by a waveguide different in their sizes is formed on a semiconductor substrate, a voltage is impressed to a carrier injection electrode provided on the resonator to be laser-oscillated, and a frequency difference between clock-wise and anticlock-wise rotational oscillation modes is found as voltage change from a voltage detecting terminal or a beam multiplexing prism.
Abstract: PROBLEM TO BE SOLVED: To provide a semiconductor laser gyro of a reduced size without sacrificing measurement accuracy. SOLUTION: A multiply encirclement ring resonator 22 constituted by plural encirclement optical paths (waveguide) different in their sizes is formed on a semiconductor substrate 21, a voltage is impressed to a carrier injection electrode 23 provided on the resonator 22 to be laser-oscillated, and a frequency difference between clock-wise and anticlock-wise rotational oscillation modes is found as voltage change from a voltage detecting terminal 24 or a beam multiplexing prism 25 and a photoreceiver 26 so as to measure rotational angular velocity applied from an outside.
3 citations
Patent•
17 Jul 2002
TL;DR: In this article, a measuring system for a drilling arrangement comprises a measuring unit (10) with sensors and a means for moving the unit along a borehole, and the positions of locations between these two points are determined by dead reckoning based on signals generated by the gyroscope.
Abstract: A measuring system for a drilling arrangement comprises a measuring unit (10) with sensors and a means for moving the unit along a borehole. The sensors include at least one of the following - a fibre optic gyroscope, a ring laser gyroscope, a microelectromechanical system and a tempo sensor. An Independent claim is also included for a method of measuring a distance between two points in a borehole. DGPS (RTK) readings are taken at both points in the borehole, a measuring unit with an optical gyroscope is moved from the first point to the second point, and the positions of locations between these two points are determined by dead reckoning based on signals generated by the gyroscope. Dead reckoning is then used to determine a position for the second point, the difference between the DGPS (RTK) reading and the dead reckoning calculated position for the second point is calculated, and this difference is used to correct the positions of the locations between the first and second points.
3 citations
Journal Article•
TL;DR: In this article, a dynamic north-finder scheme based on the fiber optic gyroscope (FOG) was presented to measure the north component of the angular velocity of earth rotation, the sine output signal of the FOG was sampled and processed to calculate the direction of surveyed point on the surface of earth.
Abstract: A dynamic north-finder scheme based on the fiber optic gyroscope(FOG) is presented to measure the north component of the angular velocity of earth rotation.The sine output signal of the FOG is sampled and processed to calculate the direction of surveyed point on the surface of earth.The principle and the prototype of the fiber optic gyroscope north-finder is described,the deviation influence caused by the basemen tilt on the north angle precision is analyzed particularly,the accelerometer is used to compensate and improve the accuracy of the north-finder.The multi-period and multi-position sampling techniques are adopted to effectively restrain the measurement noise of FOG.The test results show that the true north angle accuracies of 5′ can be obtained within not more than three minutes.
3 citations
Patent•
04 Apr 1987
TL;DR: In this article, the authors proposed a waveguide for forming a ring resonator on the periphery of a substrate made of a heat resistant material, and disposing a polarizer, a phase modulator, a light source and a photodetector inside the waveguide.
Abstract: PURPOSE:To improve the environmental characteristic and to reduce the size by forming a waveguide for forming a ring resonator on the periphery of a substrate made of a heat resistant material, and disposing a polarizer, a phase modulator, a light source and a photodetector inside the waveguide. CONSTITUTION:A glass thick film 2 is formed of SiO2 on a substrate 1. Ge, Ti-doped SiO2 film 11 of approx. 5mum thick is formed on the film 2. Then, a mask 12 having 3, 6, 6 patterns is formed on the film 1. Subsequently, the film 11 except the mask 12 is etched by reactive ion etching, and waveguides 3, 6, 6 are formed on the film 2. Thereafter, recesses 13... for mounting a laser diode, a photodiode, a phase modulator are formed. Then, the laser diode 4, the photodiodes 5, 5 and the phase modulator 8 are mounted in the recesses 13, metal is deposited on the waveguides 6, 6 to become polarizers to form polarizers 7, 7, thereby obtaining a laser gyroscope.
3 citations
TL;DR: In this paper , the authors proposed a new approach implemented by using a Mach-Zehnder modulator with a passive ring resonator connected to one of its arms, which makes it possible to obtain a mutual configuration and makes the use of a tunable laser optional.
Abstract: Today, the task of developing microoptical gyroscopes is topical. Usually, tunable lasers with a built-in frequency stabilization system are used in such gyroscopes. They are comparatively bulky, which hinders the real miniaturization of optical gyroscopes. We propose a new approach implemented by using a Mach–Zehnder modulator with a passive ring resonator connected to one of its arms. This makes it possible to obtain a mutual configuration and makes the use of a tunable laser optional. Two ring resonators made of the polarization-maintaining fiber, suitable for use as sensitive elements of a gyroscope, were realized and investigated. Their Q-factor is equal to 14.5 × 106 and 28.9 × 106. The maximum sensitivity of the proposed method when using the described resonators is 3.2 and 1.8 °/h, respectively. The first experimental setup of a resonator gyroscope implementing this approach has been manufactured and analyzed. When measuring the rotation speed by the quasi-harmonic signal span and its phase, the measurement accuracy was approximately 11 and 0.4 °/s, respectively.
3 citations