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Optical fiber ring eigenfrequency measurement device and method based on sine wave modulation and second harmonic detection

A technology of sine wave modulation and second harmonic, which is applied in the direction of measuring devices, testing optical properties, instruments, etc., can solve the problems of high measurement cost and insufficient measurement accuracy of the intrinsic frequency of the optical fiber ring, so as to improve the measurement accuracy and reduce the cost Effect

Inactive Publication Date: 2016-04-06
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0005] In order to solve the problem of insufficient measurement accuracy and high measurement cost of the current fiber ring eigenfrequency, the present invention proposes a method based on sine wave modulation and second harmonic detection that can measure the fiber ring eigenfrequency at a lower cost and with higher precision. Optical fiber ring eigenfrequency measurement device and method

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  • Optical fiber ring eigenfrequency measurement device and method based on sine wave modulation and second harmonic detection
  • Optical fiber ring eigenfrequency measurement device and method based on sine wave modulation and second harmonic detection
  • Optical fiber ring eigenfrequency measurement device and method based on sine wave modulation and second harmonic detection

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Embodiment Construction

[0030] see figure 1 , figure 2 , image 3 , the device of the present invention comprises a light source, a coupler, a modulator, an optical fiber ring, a D / A and a filter amplifying circuit, a waveform modulation output and a second harmonic detection circuit, an amplifying sampling circuit and a detector, the light source is connected to the coupler, and the coupler is respectively Connect to the detector and modulator, the optical fiber ring is connected to the modulator, the detector is connected to the waveform modulation output and the second harmonic detection circuit after the detector is connected to the waveform modulation output and the second harmonic detection circuit in series, and the waveform modulation output and the second harmonic detection circuit are connected in series with D / A and filtering After the amplifying circuit is connected to the modulator, the waveform modulation output and the second harmonic detection circuit are sine wave modulation output...

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Abstract

The invention discloses an optical fiber ring eigen frequency measurement device and method based on sine wave modulation and second harmonic detection. According to the optical fiber ring eigen frequency measurement device and method, modulation is applied to by adopting a sine wave, and a second harmonic amplitude in an output signal is interfered through detecting an optical fiber ring, thus an eigen frequency is measured. The optical fiber ring eigen frequency measurement device has the technical effect that the modulation is applied by using the sine wave instead of a square wave, multiple defects caused by modulation of the square wave are overcome, the amplitude of the second harmonic of the output signal is detected, and high signal to noise ratio can be obtained by adopting a correlation detection technology.

Description

technical field [0001] The invention relates to a device and method for measuring the eigenfrequency of an optical fiber ring, in particular to a device and method for measuring the eigenfrequency of an optical fiber ring based on sine wave modulation and second harmonic detection. Background technique [0002] The fiber optic ring is a key component that is sensitive to angular velocity in the fiber optic gyroscope. Two light waves propagating in opposite directions into the fiber optic ring propagate along the fiber ring for a week and then interfere to produce the Sagnac effect. The angular velocity is measured through the Sagnac effect. One-half of the reciprocal of the propagation time τ of the light wave in the fiber ring is the eigenfrequency of the fiber ring The eigenfrequency is one of the important parameters of the fiber optic ring, especially for the closed-loop fiber optic gyroscope, the modulation frequency should be equal to the eigenfrequency of the fiber o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C25/00G01C19/72
CPCG01C19/72G01C25/005G01M11/02
Inventor 陈宇中宋章启张学亮阳明晔胡永明孟洲熊水东
Owner NAT UNIV OF DEFENSE TECH
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