Simultaneous measurement method of magnetic field and temperature based on ferrofluid filled photonic crystal microcavity

A photonic crystal microcavity and measurement method technology, applied to measurement devices, instruments, etc., can solve problems such as low accuracy, measurement accuracy is affected by temperature, etc., achieve fast response, solve external temperature interference, and reduce costs.

Active Publication Date: 2016-06-22
NORTHEASTERN UNIV LIAONING
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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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  • Simultaneous measurement method of magnetic field and temperature based on ferrofluid filled photonic crystal microcavity
  • Simultaneous measurement method of magnetic field and temperature based on ferrofluid filled photonic crystal microcavity
  • Simultaneous measurement method of magnetic field and temperature based on ferrofluid filled photonic crystal microcavity

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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, the radius of the air holes is r=0.32a (where a=447nm is the lattice constant of the photonic crystal, that is, the distance between adjacent air holes), and the waveguide width is ==1.9052a, the selected background medium is ordinary silicon material, its thickness is h=220nm, and the effect...

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Abstract

The invention proposes a method for simultaneously measuring the magnetic field and temperature based on the magnetic fluid filling the photonic crystal microcavity. Two cascaded photonic crystal microcavities are formed by filling two different types of magnetic fluids in the air holes in two different regions of a photonic crystal waveguide plate, so that the output spectrum of the photonic crystal waveguide will appear in two independent resonance valleys (corresponding to two resonance wavelengths). As the external magnetic field or temperature changes, the refractive index of the two filled magnetic fluids will change to varying degrees, so that the two resonance wavelengths in the output spectrum of the photonic crystal waveguide will move, and the two resonance wavelengths will refract the magnetic fluid. Sensitivity to rate changes is inconsistent. Finally, the dual-wavelength matrix method is used to deduce the change of the external magnetic field and temperature according to the movement of the two resonance wavelengths, so as to realize the simultaneous measurement of the magnetic field and temperature. It can be calculated that the minimum detectable magnetic field change is 1.333Oe, and the minimum detectable temperature change 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.). The widely used magnetic field sensor based on Hall effec...

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Application Information

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