| 摘要 |
Apparatus is provided to sense and measure solarinduced luminescence, as well as reflectance, within the field of view of a target window for receiving a composite ray of light from the target. A first filter within the path of the composite ray of light transmits a first narrowband component thereof, including a predetermined Fraunhofer Line frequency, to a first sensor. A second narrowband component thereof, proximate the Fraunhofer Line frequency, is directed to a second sensor such that ratios of the electromagnetic energy impinging, respectively, on the first and second sensors may be determined. A removable filter tray assembly carrying the narrowband filters and fine tuning means are employed to facilitate the selection of the predetermined Fraunhofer Line frequency.
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