Multi-mode thermal imaging device and operation method thereof

A multi-mode thermal imaging device, comprising:

• a microscope;
• a spectroscope;
• a controller;
• and
• an infrared thermal imager,
• wherein the multi-mode thermal imaging device operates in one of multiple modes,
• wherein in a first mode among the multiple modes, the microscope scans a first sample with an optical signal from a light source, the spectroscope detects signals reflected from the first sample by separating them for each wavelength, and the controller derives a reflectance change spectrum according to the wavelength on the basis of the signals detected separately for each wavelength, selects a wavelength on the basis of the derived reflectance change spectrum, and obtains a thermal image of the first sample by detecting, through a filter, an optical signal limited to the selected wavelength from among the signals reflected from the first sample, and
• wherein in a second mode among the multiple modes, the infrared thermal imager detects thermal radiation of a second sample to obtain a thermal image of the second sample.