Magnetic field and temperature simultaneous measurement method based on photonic crystal micro-cavities filled with magnetic fluid

A photonic crystal microcavity and measurement method technology, applied in measurement devices, instruments, etc., can solve the problems of measurement accuracy affected by temperature and low accuracy, and achieve the effects of solving external temperature interference, fast response speed, and light weight

Active Publication Date: 2014-10-01
NORTHEASTERN UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of low accuracy and temperature-affected measurement accuracy in traditional magnetic field sensors, and propose a sensor with simple structure, easy implementation, high sensitivity, small volume, good stability, and the ability to simultaneously measure magnetic field and temperature Methods

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  • Magnetic field and temperature simultaneous measurement method based on photonic crystal micro-cavities filled with magnetic fluid
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  • Magnetic field and temperature simultaneous measurement method based on photonic crystal micro-cavities filled with magnetic fluid

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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention clearer, the specific structure, principle and sensing characteristics of the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0025] The present invention proposes a simultaneous measurement method of magnetic field and temperature based on ferrofluid filled photonic crystal microcavity, such as figure 1 Shown is a schematic diagram of the structure of a cascaded photonic crystal microcavity based on ferrofluid filling. In this structure, the air holes are arranged in an equilateral triangle, and the radius of the air holes is r =0.32 a (in a= 447nm is the lattice constant of the photonic crystal, that is, the spacing between adjacent air holes), and the waveguide width is ==1.9052 a , the selected background medium is ordinary silicon material, and its thickness is h =220nm...

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Abstract

The invention provides a magnetic field and temperature simultaneous measurement method based on photonic crystal micro-cavities filled with magnetic fluid. Air holes in different regions of a photonic crystal waveguide flat plate are filled with two different types of magnetic fluid respectively so that the two cascaded photonic crystal micro-cavities can be formed, and therefore two resonance troughs corresponding to two resonant wavelengths can appear in an output spectrum of a photonic crystal waveguide, wherein the resonance troughs are independent of each other. According to the changes of the external magnetic field or the temperature, the refractive indexes of the two types of filling magnetic fluid can change to different degrees, and therefore the two resonant wavelengths in the output spectrum of the photonic crystal waveguide can move, and the sensitivity of the two resonant wavelengths to the changes of the refractive indexes of the magnetic fluid is inconsistent. Finally, the change amount of the external magnetic field and the change amount of the temperature can be obtained through reverse calculation according to the movement amount of the two resonant wavelengths by means of a double-wavelength matrix method, and the magnetic field and the temperature can be simultaneously measured. Calculation shows that the minimum detectable magnetic field change amount is 1.333Oe, and the minimum detectable temperature change amount is 0.301K.

Description

technical field [0001] The invention relates to a method for simultaneously measuring a magnetic field and a temperature based on a photonic crystal microcavity filled with a magnetic fluid, and belongs to the technical field of photoelectric detection. Background technique [0002] Magnetic fields are the basic physical parameters of many natural phenomena. High-precision navigation and positioning of automobiles and aircraft, medical biological detection and disease detection, acquisition of abnormally weak signals, exploration of danger and areas that humans cannot reach, etc., all require the use of magnetic fields sensor. Therefore, the research on magnetic field measurement methods has been widely concerned by people (document 1. Jiang Zhipeng, Zhao Wei, Qu Kaifeng, the development and application of magnetic field measurement technology [J], Electric Measurement and Instrumentation, 2008, 45(508): 1- 5, 10.). Although the widely used magnetic field sensor based on t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/02
Inventor 赵勇张亚男李晋
Owner NORTHEASTERN UNIV
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