A Method of Measuring the Bandwidth of Fiber Optic Gyroscope under Static Condition
A fiber optic gyroscope and a technology for measuring optical fibers, which are applied to the bandwidth measurement of fiber optic gyroscopes and the field of measuring the bandwidth of fiber optic gyroscopes, to achieve the effects of high measurement accuracy, simplified test equipment and test procedures, and a wide range of applications
Active Publication Date: 2017-05-10
BEIJING AEROSPACE TIMES OPTICAL ELECTRONICS TECH
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Problems solved by technology
[0018] The technical problem of the present invention is: to overcome the deficiencies of the prior art, and to invent a method for testing the bandwidth of the fiber optic gyroscope under static conditions, which can measure the bandwidth of the fiber optic gyroscope under static conditions, and can measure the high angle vibration method of the turntable that cannot be measured Bandwidth Fiber optic gyro bandwidth, to the greatest extent to meet the needs of fiber optic gyro bandwidth testing
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[0058] With half-wave voltage V H =3.2V, measuring range L=205° / s, eigenperiod τ=4us fiber optic gyroscope as an example, the specific implementation steps of using this method to test the bandwidth are as follows:
[0059] (1) Connect the fiber optic gyroscope and test system according to Figure 4 The relationships shown are connected fine.
[0060] (2) Predetermine the frequency points of the input voltage signal, as shown in the array F, F={5,10,20,30,40,50,60,70,80,90,100,120,140,160,180,200,240,280,320,400}, unit: Hz.
[0061] (3) Set the amplitude of the output voltage signal of the signal generator to A=2.5V, and set the frequency of the output voltage signal of the signal generator according to the frequency value in the array F.
[0062] (4) At each frequency point, collect and save the output data of the FOG for 10s.
[0063] (5) According to the formula Calculate the amplitude of the equivalent angular vibration generated by the voltage signal of each frequenc...
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The invention discloses a method for measuring a fiber-optic gyroscope bandwidth under the static condition. A plurality of testing frequency points and output voltage signal amplitude of an external signal generator of each frequency point are set in a test frequency range; sinusoidal voltage signals with different frequencies are generated respectively, and output signals of a fiber-optic gyroscope are collected at the frequency points; angular vibration amplitude with equivalent action with the sinusoidal voltage signals is calculated, and an amplitude value of an output angle velocity signal of the fiber-optic gyroscope after fitting is calculated with a least square method; responsivity of the fiber-optic gyroscope at each frequency point is obtained, a corresponding frequency value when the responsivity is 0.707 in a curve of fiber-optic gyroscope responsivity changing with frequency is fit, and the frequency value is the fiber-optic gyroscope bandwidth. The fiber-optic gyroscope bandwidth can be measured under the static condition, the bandwidth, which cannot be measured with a rotary table angular vibration method, of a high-bandwidth fiber-optic gyroscope can be measured, and demand of the fiber-optic gyroscope bandwidth test can be met to the greatest extent.
Description
technical field [0001] The invention relates to a method for measuring the bandwidth of an optical fiber gyroscope, in particular to a method for measuring the bandwidth of an optical fiber gyroscope under static conditions, which belongs to the field of optical fiber gyroscope testing and is suitable for measuring the bandwidth of an optical fiber gyroscope. Background technique [0002] The closed-loop interferometric fiber optic gyroscope is an angular velocity sensor based on the Sagnac effect, and its system composition is as follows: figure 2 shown. In the fiber optic gyro optical path, the light emitted by the light source reaches the Y waveguide after passing through the coupler, and after passing through the Y waveguide, it is divided into two beams of light with the same intensity and enters the fiber optic ring. To form an interference beam, due to the rotational speed of the optical fiber ring relative to the inertial space, there is a phase difference between t...
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IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 赵政鑫王巍于海成王军龙李超石海洋杨学礼
Owner BEIJING AEROSPACE TIMES OPTICAL ELECTRONICS TECH