GRID SPECTROMETER HAVING A SWITCHABLE LIGHT PATH

摘要

The invention relates to an improved spectrometer for the optical emission spectrometry having a radiation-emitting source (11), an entrance slit (2), a grid (1), a long-pass filter (10), and detectors (3, 4, 5, 6), wherein during operation, the radiation falls from the entrance slit (2) at a first angle of incidence (α1) against the grid normal (N) onto the grid (1). The spectrometer is characterized in that a first mirror is provided at a point, on which the radiation reflected in zero-order on the grid falls onto the first mirror; a second mirror is provided at a point, where the radiation reflected in zero-order on the grid falls from the first mirror onto the second mirror. The second mirror is aligned such that the radiation reflected on the second mirror falls onto the grid at a second angle of incidence (α2). At least one aperture (9) is provided that can be switched into the optical path between the grid, the first mirror, the second mirror, and the grid for selectively interrupting said pathway. Controlling means are provided that control the spectrometer such that either the aperture or the filter is switched on.