Double Y-shaped cavity double-frequency laser accelerometer

Abstract

The invention discloses a double Y-shaped cavity double-frequency laser accelerometer, which belongs to the technical field of laser and precision measurement, and comprises an optical module, a working point selection and control module, a signal acquisition and processing module and the like. The optical module consists of two symmetric Y-shaped cavity double-frequency lasers and a novel gas diaphragm capsule. The gas diaphragm capsule is used as a primary acceleration sensing element to convert the change of an input acceleration first into the change of the refractive index of a sensing gas in the gas diaphragm capsule and then into the beat frequencies of the Y-shaped cavity double-frequency lasers and to output the beat frequencies; then a double Y-shaped cavity structure is used to differentiate the beat frequencies of the two Y-shaped cavity double-frequency lasers; and thus, a final output signal is obtained. The working point selection and control module is used for selecting and controlling the working point of the accelerometer, and a light intensity difference method is used to stabilize the frequencies of the double-frequency lasers. The signal acquisition and processing module is used to receive the output beat frequency signal of the two Y-shaped cavity double-frequency lasers and the difference between the two beat frequencies is calculated and used as the final output signal of an acceleration system. The double Y-shaped cavity double-frequency laser accelerometer measures the acceleration of a carrier by measuring the difference between the beat frequencies of the two double-frequency lasers and has the characteristics of high resolution, big scale factor, high linearity, digital output and the like.

Description

technical field [0001] The invention relates to a novel high-precision laser accelerometer, in particular to a novel gas bellows type dual-frequency laser accelerometer, which belongs to the technical field of laser and precision measurement. Background technique [0002] The accelerometer is an important component in the inertial navigation and guidance system, which converts the motion acceleration of the controlled or measured carrier along its input axis into electrical signals or other forms of signals. The development of accelerometers has gone through decades of history and there are many types. The development of modern laser technology, optical fiber sensing technology, and micro-manufacturing technology has provided favorable conditions for the research of optical accelerometers. Optical accelerometers have gradually become a hot spot in the research of accelerometers at home and abroad because of their high sensitivity and strong anti-electromagnetic interference ...

AI Technical Summary

Problems solved by technology

Generally speaking, the above schemes have their own characteristics, but due to their inherent shortcomings in principle and technology, there is no relevant report on the successful development of high-precision laser accelerometers in the world.

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