Method and device for measuring environment temperature change and magnetic induction strength
A technology of magnetic induction intensity and ambient temperature, applied in the direction of measuring devices, the size/direction of the magnetic field, and the use of magneto-optical equipment for magnetic field measurement, etc., can solve problems such as complex execution
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Publication Date
- 2012-09-12
- Estimated Expiration
- Not applicable · inactive patent
Smart Images
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Abstract
Description
technical field
[0001] The invention belongs to the field of optoelectronic technology and relates to optical fiber sensing technology, in particular to a method and device for measuring magnetic induction (or optical fiber Verdet constant) and temperature changes based on a magneto-optic optical fiber Bragg grating (MFBG). Background technique
[0002] Optical fiber sensing technology is a new type of sensing technology developed rapidly along with the development of optical fiber and optical fiber communication technology. It takes the optical signal as the carrier of the information to be measured, uses the optical fiber as the transmission medium and the sensing medium, and extracts the measured information in the form of an optical signal. Specifically, the optical fiber sensor directly or indirectly detects the characteristic parameters of the light wave in the optical fiber (such as light intensity, wavelength, phase, amplitude, etc.) A device that detects various ph...
Examples
specific Embodiment approach 1
[0041] A measuring device for ambient temperature change and magnetic induction, such as Figure 4 , 5 As shown, it includes a polarized light emitting unit, a magneto-optical fiber Bragg grating (MFBG), a polarized light detecting unit and a data processing unit.
[0042] The polarized light emitting unit includes the first and second narrowband light sources, the first and second optical fiber polarizers, the first and second optical polarization controllers and optical wavelength division multiplexer WDM; the wavelength emitted by the first narrowband light source is λ 1 After being polarized by the first optical fiber polarizer, the light passes through the first optical polarization controller to generate left-handed circularly polarized light; the wavelength emitted by the second narrow-band light source is λ 2 After being polarized by the second optical fiber polarizer, the light passes through the second optical polarization controller to generate right-handed circula...
specific Embodiment approach 2
[0046] A measuring device for ambient temperature change and magnetic induction, such as Figure 4 , 6 As shown, it includes a polarized light emitting unit, a magneto-optical fiber Bragg grating (MFBG), a polarized light detecting unit and a data processing unit.
[0047] The polarized light emitting unit includes the first and second narrowband light sources, the first and second optical fiber polarizers, the first and second optical polarization controllers and optical wavelength division multiplexer WDM; the wavelength emitted by the first narrowband light source is λ 1 After being polarized by the first optical fiber polarizer, the light passes through the first optical polarization controller to generate left-handed circularly polarized light; the wavelength emitted by the second narrow-band light source is λ 2 After being polarized by the second optical fiber polarizer, the light passes through the second optical polarization controller to generate right-handed circula...