Imaging measurement device using gas absorption in the mid-infrared band and operating method of imaging measurement device

An operating method of an imaging measurement device, the method comprising:

• emitting first light and second light to a target, wherein the first light is included in a wavelength band, in which there is no absorption of a gas in a mid-infrared band, and the second light is included in a wavelength band in which the absorption of the gas is present in the mid-infrared band;
• detecting a first active signal and a second active signal, which are reflected from the target, wherein the first active signal is related to the first light, and the second active signal is related to the second light;
• obtaining an active image based on the first active signal;
• calculating a distance to the target based on the first active signal and the second active signal;
• and
• obtaining a three-dimensional (3D) image based on the active image and the calculated distance,
• wherein the calculating of the distance to the target based on the first active signal and the second active signal comprises:
• calculating an absorption coefficient based on a concentration of the gas in an atmosphere;
• and
• calculating the distance based on the first active signal, the second active signal, and the absorption coefficient of the gas,
• wherein the calculating the distance based on the first active signal, the second active signal, and the absorption coefficient of the gas comprises:
• normalizing an intensity of each of the first active signal and the second active signal;
• and
• calculating the distance based on Equation 2:
• ln
• ⁢
• I
• ⁢
• 2
• I
• ⁢
• 1
• =
• -
• 2
• ·
• a
• ·
• l
• ,
• and
• wherein in the Equation 2, the I1 denotes the normalized first active signal, the I2 denotes the normalized second active signal, the ‘a’ denotes the absorption coefficient, and the ‘l’ denotes the distance.