常问问题

Why would you use a mid-wave camera vs a long-wave camera?

A thermal infrared camera measures a quantity called radiometric temperature by interpreting the infrared radiation emitted from the surface of objects within the scene. Each object is modeled as a blackbody with a unitary, spectrally flat emissivity profile that emits radiation only according to its temperature. Real objects do not have a unitary emissivity value and in fact, most real materials have spectrally varying emissivity profiles. Additionally, the thermal radiation from objects within the scene entering the camera is modified by the transmission properties of the intervening atmosphere. In order to convert the radiometric temperature measured by an infrared camera to the true thermodynamic temperature of an object, it is necessary to compensate for both the true material emissivity and atmospheric transmission properties.

How does Telops blackbody-free permanent radiometric calibration work?

Typically, infrared cameras are calibrated using high-precision blackbody reference sources to implement a non-uniformity correction (NUC) for improved image quality and a radiometric calibration to relate observed detector response (digital counts) to blackbody temperature for a single exposure time. Use of additional exposure times requires the construction of additional calibration data sets.

Telops proprietary permanent radiometric calibration works by considering the electron flux generated by the detector (determined by dividing digital counts by exposure time) as a function of blackbody temperature. The flux generated by the detector is independent of the exposure time and as such, this calibration strategy supports a wide range of operating parameters without the need for recalibration. All Telops high-speed broadband and multispectral imagers are delivered with this permanent calibration fully implemented. We recommend that cameras be factory recalibrated every 2 years.

Does a thermal camera measure the true temperature of an object?

A thermal infrared camera measures a quantity called radiometric temperature by interpreting the infrared radiation emitted from the surface of objects within the scene. Each object is modeled as a blackbody with a unitary, spectrally flat emissivity profile that emits radiation only according to its temperature. Real objects do not have a unitary emissivity value and in fact, most real materials have spectrally varying emissivity profiles. Additionally, the thermal radiation from objects within the scene entering the camera is modified by the transmission properties of the intervening atmosphere. In order to convert the radiometric temperature measured by an infrared camera to the true thermodynamic temperature of an object, it is necessary to compensate for both the true material emissivity and atmospheric transmission properties.

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