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Infrared measuring instruments
The following are examples of infrared (IR) measuring instruments:


 * camera,
 * spectrometer,
 * hyperspectral camera.

Each pixel of the camera constitute a sensor, also called a detector. These detectors each covers a wide wavelength band. The spectrometer have only one detector, i.e. pixel in camera terminology, but from the one pixel a wavelength spectrum is obtained. The hyperspectral camera has many pixels, similar to the normal IR camera, but each pixel has a spectrum.