A Temperature Detection Method Based on Infrared Superlens

Abstract

This application discloses a temperature detection method based on an infrared metalens for measuring the temperature of power equipment. The method is characterized by the fact that changes in the temperature of the power equipment radiate infrared electromagnetic waves of different wavelengths. These waves act on the metalens, and different wavelengths correspond to different focal planes. By measuring the position of the focal plane, the wavelength of the electromagnetic wave is obtained, thereby inferring the temperature of the power equipment. The advantage of this application lies in addressing the low sensitivity of power equipment temperature monitoring by proposing a design with strong dispersive infrared metalens structure. By measuring the focal plane positions corresponding to different wavelengths of electromagnetic waves, the temperature of the power equipment can be deduced. Based on the strong dispersive characteristics of the metalens structure and utilizing a physical model that establishes a one-to-one correspondence between focal plane position and temperature, efficient and highly sensitive detection of temperature changes in power equipment can be achieved.

Description

Technical Field

[0001] This application relates to a temperature detection method based on an infrared superlens, belonging to the field of temperature detection technology. Background Technology

[0002] A power system comprises a wide variety of electrical equipment, such as steam turbines, generators, transformers, and hydro turbines, as well as transmission lines of various voltage levels, instrument transformers, and contactors. To ensure the normal and stable operation of this equipment, improving the level of technical supervision is crucial. The operating temperature of electrical equipment is the most direct indicator of its operating status; abnormal operating temperatures indicate internal problems. Therefore, highly sensitive temperature detection of electrical equipment is of great significance for power system monitoring. Currently, temperature detection typically uses handheld infrared thermometers; however, this method requires manual inspection, is costly and cumbersome, and has relatively low sensitivity. Summary of the Invention

[0003] The technical problem this application aims to solve is how to improve the sensitivity of temperature detection.

[0004] To address the aforementioned technical problems, the present application provides a temperature detection method based on an infrared superlens for measuring the temperature of power equipment. The method is characterized by the fact that changes in the temperature of the power equipment result in the radiation of infrared electromagnetic waves of different wavelengths. These infrared electromagnetic waves act on the superlens, and different wavelengths correspond to different focal planes. By measuring the position of the focal plane, the wavelength of the electromagnetic wave is obtained, thereby deducing the temperature of the power equipment.

[0005] Specifically, the superlens is configured as a strongly dispersive infrared superlens, and the fabrication steps of the strongly dispersive infrared superlens are as follows:

[0006] Step 1: Determine the wavelength range of infrared electromagnetic waves emitted by the electrical equipment based on its temperature range.

[0007] Step 2: Determine a center wavelength based on the wavelength range, and design a superlens at that wavelength;

[0008] Step 3: Select a structural unit with strong dispersive properties as the unit cell of the superlens, and calculate the amplitude and phase changes of the scattered field of the structural unit with different structural parameters at the center wavelength.

[0009] Step 4: Based on the phase distribution formula of the superlens, select structural primitives with appropriate structural parameters and arrange them in space to accurately match the spatial phase distribution required by the superlens.

[0010] Step 5: Fabricate the designed superlens using photolithography and etching processes.

[0011] Preferably, the structural element is a germanium cross resonance structure with strong dispersive properties. The germanium cross resonance structure includes a square substrate and a raised cross shape located at the center of the upper surface of the substrate. The structural parameters of the germanium cross resonance structure include the period p, the height h of the cross shape, and the width b and length l of the cross shape; adjusting the structural parameters controls the amplitude and phase response of the scattered field of the structural element.

[0012] The advantage of this application lies in addressing the low sensitivity of temperature monitoring for power equipment by proposing a design of an infrared metasurface lens structure with strong dispersive properties. By measuring the focal plane position corresponding to electromagnetic waves of different wavelengths, the temperature of the power equipment can be deduced. Based on the strong dispersive properties of the metasurface lens structure and utilizing a physical model that establishes a one-to-one correspondence between the focal plane position and temperature, highly efficient and sensitive detection of temperature changes in power equipment can be achieved. Attached Figure Description

[0013] Figure 1 This is a top view of the structural elements provided in the embodiment;

[0014] Figure 2 This is a side view of the structural elements provided in the embodiment. Detailed Implementation

[0015] To make this application more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0016] Example

[0017] This embodiment provides a temperature detection method based on an infrared superlens, which can be used to measure the temperature of power equipment. It is known that when the temperature of power equipment changes, it radiates infrared electromagnetic waves of different wavelengths. When these infrared electromagnetic waves act on the superlens, different wavelengths correspond to different focal planes. By measuring the position of these focal planes, the wavelength of the electromagnetic wave is obtained, and thus the temperature of the power equipment can be deduced. The superlens used is an infrared superlens with strong dispersion. When infrared electromagnetic waves of similar wavelengths are incident on the superlens, they are focused at different focal planes with significant distances after exiting due to the strong dispersion effect. By using these different focal planes to infer different temperatures, the sensitivity of temperature measurement is improved.

[0018] Specifically, this embodiment proposes a novel temperature detection device for power equipment, employing a strongly dispersive infrared superlens. The temperature of the power equipment is deduced by measuring the focal plane position of the superlens. Due to the strong dispersive properties of the infrared superlens, its focal position is strongly correlated with the wavelength of the incident electromagnetic wave. This means that even small temperature changes in the power equipment affect the focal plane position of the superlens. Therefore, the temperature detection device provided in this embodiment can effectively improve the sensitivity of temperature detection. The design steps of the strongly dispersive infrared superlens are as follows:

[0019] Step 1: Based on the temperature range of the electrical equipment, determine the wavelength range of the infrared electromagnetic waves it radiates: λ1~λ2;

[0020] Step 2: Determine a center wavelength based on the wavelength range. Design a superlens at this wavelength;

[0021] Step 3: Select a structural element with strong dispersive properties as the unit cell of the superlens. At the center wavelength, calculate the amplitude and phase changes of the scattered field of the structural element with different structural parameters. Specifically, the amplitude and phase changes of the structural element are calculated using the finite element method or the finite-difference time-domain method. Import the model of the structural element into software such as Comsol or CST for the finite element method or software such as Lumerical or Eastwave for the finite-difference time-domain method to calculate the amplitude and phase changes of the scattered field of the structural element.

[0022] Step 4: Based on the phase distribution formula of the superlens, select structural primitives with appropriate structural parameters and arrange them in space to accurately match the spatial phase distribution required by the superlens. Specifically, structural primitives with different structural parameters correspond to different amplitude phase distributions. According to the phase distribution formula, different spatial positions (x, y) have different target phases. Based on the target phase, suitable structural primitives can be selected and placed at spatial positions (x, y), thereby forming the required superlens structure.

[0023] Step 5: The designed superlens is fabricated using photolithography and etching processes. After obtaining the sample, the sample is integrated and packaged with a movable infrared detector to obtain a novel temperature detection device for power equipment.

[0024] Specifically, with the center wavelength of the infrared electromagnetic wave set at 9 μm, a germanium cross-resonance structure with strong dispersion properties is used as the structural unit in the superlens design. In this embodiment, a germanium cross-resonance structure is selected as the structural unit. See [link to relevant documentation]. Figure 1 and Figure 2 Germanium cross resonance structure: The material is germanium and includes a square matrix of a certain thickness and a raised cross shape located at the center of the upper surface of the matrix. The structural parameters of the germanium cross resonance structure are period p (matrix width), height h of the cross shape, width b and length l of the cross shape. p = 5μm, h = 4μm are selected, and b and l vary in the range of 0.8μm to 4.2μm. By changing the width b and length l of the cross shape, the amplitude and phase response of the scattered field of the structural element can be controlled.

[0025] Then, according to the phase formula of the superlens Where λ cLet f be the center wavelength, f be the focal length of the superlens, and (x, y) be the spatial coordinates. Appropriate structural elements are filled at different spatial locations, and these elements are arranged spatially to precisely match the spatial phase distribution of the lens, resulting in the designed superlens structure. The designed superlens structure is fabricated using photolithography and etching processes. A movable infrared detector is placed in the emission direction of the superlens structure. During use, the electrical equipment whose temperature is to be measured radiates infrared electromagnetic waves. These waves are incident on the superlens structure and focused onto the focal plane corresponding to the wavelength. The infrared detector moves to measure the position of the focal plane. Specifically, the focal plane of the superlens is a focused spot. By moving the infrared detector, the position with the minimum half-width and full width at half-height of the spot is found; this position is the focal plane position of the superlens. The wavelength of the electromagnetic wave is calculated from the position of the focal plane, thus deducing the temperature of the electrical equipment.

[0026] This embodiment proposes a strongly dispersive superlens structure to detect temperature changes in power equipment by measuring the position of the focal plane after electromagnetic waves pass through the superlens. Because the superlens structure has strong dispersive properties, it is highly sensitive to electromagnetic wave wavelengths, thus enabling the detection of even minute temperature changes in power equipment. This infrared superlens-based temperature detection method provides a novel solution for power equipment fault monitoring.

Claims

1. A temperature detection method based on an infrared superlens for measuring the temperature of power equipment, characterized in that, When the temperature of electrical equipment changes, it radiates infrared electromagnetic waves of different wavelengths. These infrared electromagnetic waves act on a superlens, and different wavelengths of light waves correspond to different focal planes. By measuring the position of the focal plane, the wavelength of the electromagnetic wave can be obtained, and thus the temperature of the electrical equipment can be deduced. The superlens is configured as a strongly dispersive infrared superlens, and the fabrication steps of the strongly dispersive infrared superlens are as follows: Step 1: Determine the wavelength range of infrared electromagnetic waves emitted by the electrical equipment based on its temperature range. ; Step 2: Determine a center wavelength based on the wavelength range. Design a superlens at this wavelength; Step 3: Select a structural unit with strong dispersive properties as the unit cell of the superlens, and calculate the amplitude and phase changes of the scattered field of the structural unit with different structural parameters at the center wavelength. Step 4: Based on the phase distribution formula of the superlens, select structural primitives with appropriate structural parameters and arrange them in space to accurately match the spatial phase distribution required by the superlens. Step 5: Fabricate the designed superlens using photolithography and etching processes.

2. The temperature detection method based on an infrared superlens as described in claim 1, wherein the structural unit is a germanium cross resonance structure with strong dispersion performance, the germanium cross resonance structure comprising a square substrate and a raised cross shape located at the center of the upper surface of the substrate.

3. The temperature detection method based on an infrared superlens as described in claim 2, wherein the structural parameters of the germanium cross resonance structure include the period p, the height h of the cross shape, and the width b and length l of the cross shape; adjusting the structural parameters thereby controls the amplitude and phase response of the scattered field of the structural element.

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