Real-time closed-loop measuring device and method of effective area of optical fiber loop

Abstract

The invention discloses a real-time closed-loop measuring device and method of an effective area of an optical fiber loop. The device comprises a data acquisition unit, a turntable, an optical fiber loop testing unit and a turntable control system, wherein the optical fiber loop testing unit comprises a light source, a coupler, an integrated phase modulator, a detector, a signal amplifier and a digital signal processing chip;. The method comprises the following steps: putting an optical fiber loop to be measured and the optical fiber loop testing unit on the turntable, using the turntable control system to controlling the turntable to rotate in a sinusoidal angular rate periodic sequence by using the turntable control system, and collecting the digital output quantity of the Sagnac effectgenerated by the optical fiber loop and the angular rate of rotation of the turntable under different times; and setting different angular rate points, collecting the digital output quantity of the Sagnac effect generated by the optical fiber loop, acquiring the average value, performing linear fitting to obtain a fit linear slope of curve slope, and finally obtaining effective area parameters ofthe optical fiber loop by calculation. The method disclosed by the invention adopts simple and reliable test equipment, is high in test accuracy, can quickly evaluate the effective area of the opticalfiber loop of an optical fiber gyroscope, and is favorable for realizing batch production and high-precision detection of the optical fiber loop.

Description

technical field [0001] The invention relates to optical measurement, in particular to a fast measuring device and method for the effective area of ​​an optical fiber ring. technical background [0002] Fiber optic gyroscope is a kind of optical fiber sensor sensitive to angular rate. It has the advantages of no moving parts, light weight, small size, long life, large dynamic range, wide coverage of precision applications, fast start-up, and anti-electromagnetic interference. Fiber optic gyroscopes have become one of the mainstream instruments in the field of inertial measurement and guidance in the 21st century, and have shown increasing application requirements in modern weaponry and many industrial fields. [0003] The fiber optic ring in the fiber optic gyroscope is a key component for sensitive input angular velocity, and its performance directly affects the key technical indicators of the fiber optic gyroscope. The effective area S of the optical fiber ring is an impor...

AI Technical Summary

Problems solved by technology

[0005] In view of the current situation in which the effective area of ​​the optical fiber ring is tested, the traditional test method has low test accuracy and cannot evaluate the characteristic parameters of the optical fiber ring in real time.

Images