Dual Y-Cavity Dual Frequency Laser Accelerometer

Abstract

The dual-Y-cavity dual-frequency laser accelerometer belongs to the field of laser and precision measurement technology, and is composed of an optical module, a working point selection and control module, and a signal acquisition and processing module. The optical module is composed of two symmetrical Y-cavity dual-frequency lasers and a gas bellows. Using the gas bellows as the first-stage acceleration sensitive element, the input acceleration change is converted into the refractive index change of the sensing gas in the gas bellows, and then converted into the beat frequency output of the Y-cavity dual-frequency laser, and then the double Y-type Cavity structure, the beat frequency difference of two Y-cavity dual-frequency lasers is obtained to obtain the final output signal. The working point selection and control module is used to select and control the working point of the accelerometer, and use the light intensity difference method to stabilize the frequency of the dual-frequency laser. The signal acquisition and processing module is used to receive the output beat frequency signals of two Y-cavity dual-frequency lasers, and the difference between the two beat frequencies is calculated to be the final output signal of the accelerometer system. The dual-Y cavity dual-frequency laser accelerometer of the present invention measures the acceleration of the carrier by measuring the change of the beat frequency difference between two dual-frequency lasers, and has the characteristics of high resolution, large scale factor, good linearity, and digital output. .

Description

technical field [0001] The invention relates to a high-precision novel laser accelerometer, in particular to a 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 capabi...

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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