Optical fiber loop eigen frequency measurement device and optical fiber loop eigen frequency measurement method based on sine wave modulation and first harmonic detection

A technology of sine wave modulation and eigenfrequency, which is applied to measuring devices, testing optical properties, instruments, etc., can solve the problems of insufficient measurement accuracy and high measurement cost of fiber ring eigenfrequency, and achieve the effect of improving measurement accuracy and reducing costs

Inactive Publication Date: 2014-03-05
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 first harmonic detection that can measure the fiber ring eigenfrequency at a lower cost and with higher precision. Device and method for measuring eigenfrequency of optical fiber ring

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  • Optical fiber loop eigen frequency measurement device and optical fiber loop eigen frequency measurement method based on sine wave modulation and first harmonic detection
  • Optical fiber loop eigen frequency measurement device and optical fiber loop eigen frequency measurement method based on sine wave modulation and first harmonic detection
  • Optical fiber loop eigen frequency measurement device and optical fiber loop eigen frequency measurement method based on sine wave modulation and first harmonic detection

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Embodiment Construction

[0030] see figure 1 , figure 2 , image 3 , the device of the present invention includes a light source, a coupler, a modulator, an optical fiber ring, a D / A and a filter amplifier circuit, a waveform modulation output and a first harmonic detection circuit, an amplification sampling circuit and a detector, the light source is connected to the coupler, and the coupler is respectively connected to 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 first harmonic detection circuit after the detector is connected in series to the waveform modulation output and the first harmonic detection circuit, after the waveform modulation output and the first harmonic detection circuit are connected in series to the D / A and filter amplifier circuit Connected to the modulator, the waveform modulation output and the first harmonic detection circuit are sine wave modulation output and the fir...

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Abstract

The invention discloses an optical fiber loop eigen frequency measurement device and an optical fiber loop eigen frequency measurement method based on sine wave modulation and first harmonic detection. According to the device and the method, the eigen frequency is measured by applying modulation through a sine wave and detecting the amplitude of the first harmonic in an interference output signal of an optical fiber ring. The technical effects are that the sine wave instead of a square wave is used for applying modulation, so that various shortcomings caused by the square wave modulation are overcome; furthermore, the amplitude of the first harmonic of the output signal is detected, so that a high signal-to-noise ratio can be obtained by a relevant 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 first 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 op...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C19/72G01C25/00G01J11/00
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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