Patent ID: 7576844

Claim:
In a detector system comprising a first emitter, a second emitter, and a detector, a detection method, comprising: using the first emitter to emit into a region of space first radiation having a first wavelength; while using the first emitter to emit into the region the first radiation, using the second emitter to emit into the region second radiation having a second wavelength, so that, when a particle transits through the region of space, the particle is simultaneously exposed to the first and second radiation and, in response to being exposed to the radiation, produces elastic and/or inelastic radiation; modulating the intensity of the first radiation at a first frequency and modulating the intensity of the second radiation at a second frequency, wherein first and second frequencies are different frequencies; transmitting, by reflective or refractive optics, the elastic and inelastic radiation to the detector through a filter or a combination of filters; receiving an output signal from the detector; and determining the intensity of said produced elastic radiation that can attributed to the first emitter, the intensity of said produced elastic radiation that can attributed to the second emitter, and the intensity of said inelastic radiation, by analyzing the frequency components of the output signal.