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You are here: Home FAQ What are the technical implications of the different detector sizes?

Sunday07 August 2022

What are the technical implications of the different detector sizes?

The LARRY series comes in three different lengths, corresponding to either 2048, 3000 or 3648 pixels in the CCD array.

The 2048 element CCDs have an individual pixel size of 14 microns (w) x 200 microns (h). The large pixel size makes them an ideal choice for general spectroscopic applications.

The 3000 element linear CCD arrays have a pixel size of just 7 microns (w) x 200 microns (h). This model has been designed to provide an effective trade-off betwen spectral resolution and sensitivity.

Due to their narrower geometry, these 3000-element dectectors will naturally collect only half as much light as a 14 micron wide pixel array, but they also provide twice the spectral resolution.

In practise, the reduction in sensitivity due to narrower pixel size is not a limitation as it can be compensated for at the data-processing stage. To accomplish this, our SpectraArray SL and SpectraNet software packages now support 2x, 4x and 8x horizontal binning. In addition, in-built smoothing algorithms enable these detectors to simulate 14, 28 and 72 micron wide pixel detectors.

The horizontal binning technology can also be applied to the 14 micron wide detector arrays; in this case, individual pixels then appear as 28, 56 and 112 micron wide and signal is increased proportionately.