| 摘要 |
Apparatus and method for using the apparatus are provided, where the apparatus provides for a light beam of variable area in a narrow wavelength band, where the size of the beam incident on a sample and relative movement of the sample and light irradiation and collection means is carefully controlled, so as to vary the site of interrogation. A discrete element collector system is used to efficiently collect the emitted light from the sample and direct it to a focusing lens, filter pack and photodetector for collection of the light and transmitting signals to electronic circuitry for analysis.
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