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KR-20260066593-A - Real-time surface recession monitoring system and method thereof

KR20260066593AKR 20260066593 AKR20260066593 AKR 20260066593AKR-20260066593-A

Abstract

The present invention relates to a real-time ablation monitoring system and a method thereof. The real-time ablation monitoring system according to the present invention comprises: a light collection unit installed at the front of a light spectrum analysis unit provided in a light receiving unit of a high-speed camera and collecting light necessary for light emission spectrum analysis; a light spectrum analysis unit that analyzes the light emission spectrum of the light collected by the light collection unit; a filter combination unit that selects at least one filter based on an analysis signal received from the light spectrum analysis unit; a high-speed camera that monitors light filtered through the filter selected by the filter combination unit; and an image analysis unit that monitors length ablation through contour analysis of a specimen while storing images collected by the high-speed camera in real time. According to the present invention, wavelength analysis of a strong emission spectrum emitted from the surface of a part exposed to high-temperature plasma is performed, and a combination of optical filters required to obtain a black-and-white image of the part surface is selected through this, and an image filtered through the selected filter combination is acquired with a high-speed camera, and the acquired image is analyzed to perform calculations on the contour of the part, thereby allowing the length ablation process to be monitored in real time.

Inventors

  • 문세연
  • 오필용

Assignees

  • 전북대학교산학협력단

Dates

Publication Date
20260512
Application Date
20250113
Priority Date
20241104

Claims (10)

  1. A light collecting unit installed at the front of a light spectrum analysis unit provided in the light receiving unit of a high-speed camera, and collecting light necessary for emission spectrum analysis; A light spectrum analysis unit that analyzes the emission spectrum of light collected by the light collection unit above; A filter combination unit that selects at least one filter based on an analysis signal received from the optical spectrum analysis unit; A high-speed camera that monitors light filtered through a filter selected by the filter combination unit above; and A real-time ablation monitoring system comprising an image analysis unit that monitors longitudinal ablation through contour analysis of a specimen while storing images collected by the high-speed camera in real time.
  2. In paragraph 1, A real-time ablation monitoring system characterized in that the optical spectrum analysis unit is configured to detect a visible light wavelength range of 250 nm to 900 nm.
  3. In paragraph 1, A real-time ablation monitoring system characterized by the filter combination unit comprising one or more filters, including a filter-free area, and configured to select a filter corresponding to the analysis signal of the optical spectrum analysis unit.
  4. In paragraph 1, A real-time ablation monitoring system characterized by the above filter combination unit comprising a first filter combination unit that passes only light of a specific wavelength L1 or less through a first filter, and a second filter combination unit that passes only light of a specific wavelength L2 or more, which is relatively shorter than the specific wavelength L1, through a second filter.
  5. In paragraph 1, A real-time ablation monitoring system characterized by being configured to analyze light collected through the light collection unit through the light spectrum analysis unit to determine the intensity of the light wavelength, identify point P2 where the second derivative of the emission spectrum becomes zero and point P3 where the third derivative becomes zero, select a first filter by the filter combination unit to allow only light of P2 or less to pass through, and select a second filter to allow only light of P3 or more to pass through, thereby allowing only light of P2 ≥ L ≥ P3 to pass through the high-speed camera.
  6. In paragraph 1, A real-time ablation monitoring system characterized by the image analysis unit being equipped with a monitoring application that monitors longitudinal ablation through contour analysis of a specimen while storing images collected by the high-speed camera in real time.
  7. a) A step in which a light collecting unit collects light necessary for emission spectrum analysis by a light spectrum analysis unit; b) A step in which the light spectrum analysis unit analyzes the emission spectrum of the light collected by the light collection unit; c) A step in which a filter combination unit selects at least one filter based on an analysis signal received from the optical spectrum analysis unit; d) a step in which a high-speed camera monitors light filtered through a filter selected by the filter combination unit; and e) A real-time ablation monitoring method comprising the step of an image analysis unit monitoring length ablation through contour analysis of a specimen while storing images collected by the high-speed camera in real time.
  8. In Paragraph 7, A real-time ablation monitoring method characterized in that, in step c) above, the filter combination unit comprises one or more filters including a region without filters, and is configured to select a filter corresponding to the analysis signal of the optical spectrum analysis unit.
  9. In Paragraph 7, A real-time ablation monitoring method characterized in that, in step c) above, the filter combination unit comprises a first filter combination unit that passes only light of a specific wavelength L1 or less through a first filter, and a second filter combination unit that passes only light of a specific wavelength L2 or more, which is relatively shorter than the specific wavelength L1, through a second filter.
  10. In Paragraph 7, A real-time ablation monitoring method characterized by being configured such that, in steps a) to c) above, the light collected through the light collection unit is analyzed through the light spectrum analysis unit to determine the intensity with respect to the wavelength of light, and after confirming the point P2 where the second derivative of the emission spectrum becomes zero and the point P3 where the third derivative becomes zero, a first filter is selected by the filter combination unit to allow only light of P2 or less to pass through, and a second filter is selected to allow only light of P3 or more to pass through, thereby allowing only light of P2 ≥ L ≥ P3 to pass through the high-speed camera.

Description

Real-time surface recession monitoring system and method thereof The present invention relates to a real-time ablation monitoring system and method, and more specifically, to a real-time ablation monitoring system and method that analyzes and monitors the surface ablation behavior of a part exposed to a high-temperature ablation environment in real time through image processing. Generally, structures such as high-speed vehicles, space shuttles, and re-entry vehicles undergo ablation when exposed to high-temperature environments like Earth's re-entry. In particular, since re-entry vehicles are exposed to fluid flow of at least Mach 5 and high-temperature oxidizing environments exceeding 2,000 degrees, understanding ablation is very important. In particular, for these aircraft, carbon composites have been used for decades due to their structural and thermal stability and lightweight properties, and recently, the use of carbon composites of various structures made through carbon fiber weaving has increased for fuel efficiency and high strength. However, in the case of high-speed aircraft exceeding supersonic speeds, Earth re-entry vehicles, and intercontinental ballistic missiles in the defense sector, the loss of carbon composites becomes a problem because they are exposed to high-temperature oxidation environments where they combine with oxygen in the Earth's atmosphere in high-speed and high-temperature environments. Generally, carbon materials oxidize into carbon dioxide at temperatures above 500 degrees, causing them to deform into brittle forms and eventually break. When continuously exposed to high-temperature oxidizing environments, the surface of carbon material parts undergoes abrasion, resulting in a reduction in length and weight. Therefore, in order to cope with high-temperature oxidizing environments while maintaining lightweighting, there is an increasing development of surface protection layers using thermal protection systems (TPS) with high thermal stability on the surface of carbon composites. These TPS materials mainly utilize high-melting-point materials, and ceramic-based materials are widely used. Representative high-melting-point materials are metal-carbide materials such as hafnium carbide (HfC) and zirconium carbide (ZrC), which have high melting points between 3,000 and 4,000 degrees. They are gaining attention as thermal protection materials for high-temperature environments because even when oxidized in a high-temperature oxidizing environment, they transform into materials with relatively high melting points of 2,500 to 3,000 degrees, such as hafnium oxide ( HfO₂ ) and zirconium oxide ( ZrO₂ ). Nevertheless, since ablation occurs in these TPS when continuously exposed to high-temperature environments exceeding thousands of degrees, a precise analysis of the ablation phenomenon is required in advance. Ablation primarily results in a reduction in length as the surface is abraded by thermal loads in high-temperature environments. Ultimately, if the entire surface is abraded, it causes problems where internal components are exposed to high-temperature environments; therefore, a thicker thermal shield is preferable. However, most aircraft require lightweight design, and since thermal shields are generally heavy, their thickness cannot be increased indefinitely; consequently, it is important to achieve an optimal thickness. To this end, thermal load simulation experiments are conducted in a similar high-temperature oxidation environment before the fabrication of aircraft or thermal protection components. Therefore, it is very important to understand the ablation behavior of the target component in real time during such thermal load simulation. However, since analysis is currently conducted only through the measurement of the length and mass of parts before and after exposure to high-temperature oxidation environments, there is a problem in that the complex thermal motion phenomena that aircraft with various actual routes may experience cannot be understood in real time. To address this, research has recently been conducted to monitor the length ablation process of parts exposed to high-temperature environments in real time using high-speed cameras; however, there are difficulties in capturing images because the parts emit light due to high-temperature heating. To solve this, the length ablation process is analyzed after reducing the intensity of strong light using exposure time and filters, and obtaining the contour of the part through complex post-processing. Therefore, this process hinders real-time monitoring. Meanwhile, Korean Registered Patent Publication No. 10-1930222 (Patent Document 1) discloses "a non-destructive real-time ablation measurement system and a method thereof." The non-destructive real-time ablation measurement system according to this invention comprises: an irradiator that irradiates at least one measurement light onto a measurement target; a receiver that measur