Simultaneous Spectrometers:

These instruments are designed to simultaneously measure the response at different wavelengths so as to overcome the drawbacks of the sequential spectrometers. There are two types of spectrometers belonging to this category. These are given as follows.

a) Polychromators

b) Solid state array based spectrometers

The polychromators use multiple photodetectors whereas the solid state array base spectrometers depend on charge coupled or charge injection based devices as detectors. The charge coupled devices are capable of simultaneous measurement. Now let us learn about the two kinds of spectrometers.

Figure: A schematic diagram showing the layout and optical diagram of a ICP Polychromator