A portable calibration device and calibration method for an infrared thermal imager

Abstract

The invention discloses a portable calibration device for an infrared thermal imager, which comprises a portable aluminum plate with good thermal conductivity. The shape of the aluminum plate is a rectangle with rounded corners. The surface of the aluminum plate is coated with five coating materials with different emissivity. The invention also discloses a method for calibrating an infrared thermal imager with the portable calibration device, aiming the infrared thermal imager to be calibrated at the side of the aluminum plate coated with different emissivity coatings of the device, taking a thermal map of the aluminum plate, and collecting Its radiation data and the average radiation temperature of each emissivity coating area; use a hand-held spot thermometer to align several points of each coating area on the aluminum plate of the device, and take the average temperature of several points measured As the temperature value of the coating area, the above temperature value is obtained by measurement, and the calibration curve of the infrared thermal imaging camera at different temperatures is solved. The device of the invention has the advantages of being portable and adaptable to various measurement scenarios, and the calculation steps of the method of the invention are simple, and quick calibration can be realized.

Description

technical field [0001] The invention relates to the field of infrared imaging calibration, in particular to a portable calibration device and calibration method for an infrared thermal imager. Background technique [0002] For ship targets in complex sea surfaces, many environmental factors such as solar radiation intensity, wind speed, and wind direction often change irregularly, which affect the change of ship target temperature field. When using infrared thermal imaging cameras to collect the radiation temperature / brightness of ship targets, it is usually necessary to calibrate the shooting equipment before measurement, and the results of the calibration are directly related to the final collection results of infrared radiation characteristics of ship targets. [0003] When using the existing technology to measure the infrared radiation characteristics of ship targets, the main problems are as follows: First, ship targets are generally large in size. The field of view of...

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Problems solved by technology

[0004] In order to solve the problem that it is difficult to accurately calibrate the infrared thermal imager when measuring the infrared radiation characteristics of the ship target, the present invention discloses a portable calibration device and calibration method for the infrared thermal imager. Coating materials, use infrared thermal imaging camera to collect the infrared radiation characteristics of the device, and use temperature measuring equipment (such as point thermometer) to record the temperature distribution of the coating surface, according to the object thermal radiation transfer equation, combined with the measurement data and a certain The calculation can obtain the state equations satisfied by the coatings with different emissivity under the observation results of the thermal imager, calibrate the measurement results of the infrared thermal imager, and complete the calibration of the infrared thermal imager

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