Which is the illumination requirement?

Due to its extremely high sensitivity, HERA can work under low-light illumination conditions. This advantage is a consequence of the Fourier transform approach, as the employed interferometer (and the absence of the entrance slit) guarantees a much higher throughput compared to the dispersive- or grating-based technologies.

The camera is therefore very well suited in those applications in which intense and powerful illumination sources are not allowed, as they would damage the sample, such as in biology or cultural heritage. For example, HERA hyperspectral camera is so sensitive that it can measure hyperspectral images of the fluorescence signal emitted by a sample.