Dual-wavelength radiation thermometry: Emissivity compensation algorithms

Acquired melanocytic nevi in aesthetically significant areas, especially palpebral nevi (PN), are becoming a frequent reason for patients to seek dermatologists. Surgical methods for removal of PN are reported to be associated with the risk of such side effects as scars and loss of eyelashes. Aim of the study. To evaluate the efficacy of the removal of PN on the eyelid area with dual-wavelength radiation of a copper vapor laser (CVL). Patients and methods. Laser removal of medium and large-sized PN (up to 10 mm) was performed in three fair-skin female patients. The procedures were carried out at an average CVL radiation power of 0.60.8 W, at a 3:2 ratio of radiation powers at wavelengths of 511 nm and 578 nm, exposure duration 0.3 s, light spot diameter 1 mm. The treatment was carried out during one session. Results. Removal of PN with dual-wavelength CVL radiation allowed achieving a significant lightening and reduction of the involved area, without scars. The skin healing after the procedure lasted 2 weeks. Conclusion. The high efficacy of the PN removing in the eyelid area using the dual-wavelength CVL radiation allows the introduction of this approach into dermatologists and cosmetologists clinical practice.

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Treatment of palpebral melanocytic nevi with a dual-wavelengths copper vapor laser

Vestnik dermatologii i venerologii ◽

10.25208/vdv1138-2020-96-5-47-52 ◽

2020 ◽

Vol 96 (5) ◽

pp. 47-52

Author(s):

I. V. Ponomarev ◽

Yu. N. Andrusenko ◽

Sergey Topchiy ◽

Ludmila Shakina

Keyword(s):

Radiation Power ◽

Dual Wavelength ◽

Copper Vapor Laser ◽

Vapor Laser ◽

Melanocytic Nevi ◽

Copper Vapor ◽

Surgical Methods ◽

Wavelength Radiation ◽

Skin Healing ◽

Frequent Reason

Acquired melanocytic nevi in aesthetically significant areas, especially palpebral nevi (PN), are becoming a frequent reason for patients to seek dermatologists. Surgical methods for removal of PN are reported to be associated with the risk of such side effects as scars and loss of eyelashes. Aim of the study. To evaluate the efficacy of the removal of PN on the eyelid area with dual-wavelength radiation of a copper vapor laser (CVL). Patients and methods. Laser removal of medium and large-sized PN (up to 10 mm) was performed in three fair-skin female patients. The procedures were carried out at an average CVL radiation power of 0.60.8 W, at a 3:2 ratio of radiation powers at wavelengths of 511 nm and 578 nm, exposure duration 0.3 s, light spot diameter 1 mm. The treatment was carried out during one session. Results. Removal of PN with dual-wavelength CVL radiation allowed achieving a significant lightening and reduction of the involved area, without scars. The skin healing after the procedure lasted 2 weeks. Conclusion. The high efficacy of the PN removing in the eyelid area using the dual-wavelength CVL radiation allows the introduction of this approach into dermatologists and cosmetologists clinical practice.

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High speed, two-wavelength radiation thermometry of single micro particles during CO2 laser heating

Journal of Analytical and Applied Pyrolysis ◽

10.1016/0165-2370(93)00756-d ◽

1994 ◽

Vol 28 (1) ◽

pp. 55-70 ◽

Cited By ~ 8

Author(s):

Waleed Maswadeh ◽

Ashish Tripathi ◽

Neil S. Arnold ◽

Joel DuBow ◽

Henk L.C. Meuzelaar

Keyword(s):

Co2 Laser ◽

Laser Heating ◽

High Speed ◽

Radiation Thermometry ◽

Micro Particles ◽

Wavelength Radiation

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Difference-frequency generation in the cavity of a dual-wavelength semiconductor disk laser: Effect of absorption of the short-wavelength radiation in the ’long-wavelength’ active region on the operation point stability

2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL) ◽

10.1109/caol46282.2019.9019414 ◽

2019 ◽

Author(s):

Yuri A. Morozov

Keyword(s):

Active Region ◽

Short Wavelength ◽

Difference Frequency Generation ◽

Dual Wavelength ◽

Difference Frequency ◽

Long Wavelength ◽

Semiconductor Disk Laser ◽

Wavelength Radiation ◽

Laser Effect ◽

Short Wavelength Radiation

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Detection method of combustion oscillation characteristics under strong noise background

Mechanics & Industry ◽

10.1051/meca/2020085 ◽

2020 ◽

Vol 21 (6) ◽

pp. 612

Author(s):

Yunkun Wei ◽

Tianhong Zhang ◽

Zhonglin Lin ◽

Qi Xie ◽

Yan Zhang

Keyword(s):

Radiation Thermometry ◽

Hydroxyl Group ◽

Interference Signal ◽

Engine Vibration ◽

Combustion Technology ◽

Lean Fuel ◽

Combustion Oscillation ◽

Aero Engines ◽

Temperature Measurement System ◽

Multispectral Radiation Thermometry

After the lean fuel premixed combustion technology is applied to aero engines, severe combustion oscillations will be cased and led to hidden safety hazards such as engine vibration, further energy waste and other problems. Therefore, it is increasingly important to actively control combustion oscillations. In this paper, a multispectral radiation thermometry (MRT) is used to analyze the hydroxyl group, which is a measurable research object in the combustion chamber of an aero engine, and to fit the functional relationship between the radiation intensity ratio and the temperature in different bands. The theoretical value of the error is <2%. At the same time, in order to solve the problem of weak detection signal and excessive interference signal, an improved frequency domain filtering method based on fast Fourier transform is designed. Besides, the FPGA platform is used to ensure the real-time performance of the temperature measurement system, and simulations and experiments are performed. An oscillating signal with an oscillation frequency of 315 Hz is obtained on the established test platform, and the error is only 1.42%.

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