A detector

The present invention relates to a fluorimeter. The fluorimeter has emitter means arranged to selectively emit light having a first wavelength predetermined to correspond to the excitation wavelength of a first fluorphore and to selectively emit light having a second wavelength predetermined to correspond to the excitation wavelength of a second fluorophore, i.e. the light sources are paired to respective fluorophores. This simplifies the analysis of the emitted fluorescent signals.