Patent ID: 8605283

Claim:
A particle analyzing apparatus comprising: a capillary configured to pass a fluid containing particles to be analyzed, said particles fluoresce or are labeled with substances that fluoresce upon illumination of light; a source of light; a first optical system configured to direct a beam of light through the capillary to define an analyzing region in capillary; a second optical system configured to collect fluorescent light emitted from a particle or substance labeled to the particle in the analyzing region, wherein the second optical system has an optical axis, and comprises a first collection lens attached to a first side of the capillary adjacent to the analyzing region, and a first reflection element arranged adjacent to the first collection lens configured to reflect back fluorescent light of one or more wavelengths in a direction parallel with the optical axis and transmit fluorescent light of wavelength(s) that is (are) different from the one or more wavelengths reflected by the first reflection element; and a first detector configured to detect fluorescent light transmitted through the first reflection element.