February 21, 2019

The impact of the environment on infrared thermal imaging

In the environment of infrared radiation, due to the absorption of the atmosphere, infrared radiation will be a certain amount of attenuation. When it is close to the ground, water vapor and carbon dioxide will absorb a certain amount of infrared radiation. Most thermal imaging cameras do not use compensation in the above situations. Therefore, in order to reduce the error, the infrared camera should be selected in an environment where there is no rain, no haze, and a relative humidity of 75% or less. Go on.

Under intense sunlight or intense illumination, due to the emission and diffuse reflection of light, the thermal imaging camera is greatly affected by these reflected rays and cannot make correct measurements. At the same time, the irradiation of strong light causes the temperature of the measured object to rise, and the temperature of the measured object itself is added, and the detected temperature is higher than the correct temperature of the measured object. Therefore, the thermal imaging camera should be protected from strong light to illuminate the object to be measured and the instrument itself, preferably in cloudy or cloudy weather or at night without intense illumination.

If the measured object is continuously blown by the wind, the airflow will take away the heat of the measured object, accelerate the heat dissipation of the surface of the measured object, and lower the surface temperature of the measured object, and the emitted infrared rays are weakened. At this point, the data detected by the thermal imaging camera will be lower than the correct temperature. In order to ensure the accuracy of the measurement, the thermal imaging camera should be operated in a windless or windy environment.

Dust and suspended particles are another factor that affects the operation of thermal imaging cameras. When the infrared rays emitted by the measured object pass through the dust or suspended particles in the atmosphere, the transmitted energy will be weakened, and the obtained data will be less than the normal value, which greatly affects the absorption of the infrared camera. Therefore, the thermal imaging camera should work in a clean and clean environment.

Objects around the object under test will affect the operation of the thermal imaging camera. As long as the object above absolute zero emits infrared rays, the higher the temperature of the object around the object, the larger the infrared rays emitted, the greater the influence. The lower the temperature of the surrounding objects, the smaller the infrared rays emitted, and the influence The smaller it is. Therefore, if the heat source around the object is high or high, the infrared camera should select the appropriate measurement angle or take measures to shield the surrounding environment to eliminate interference and measure the correct temperature.

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