Visibility standard utilizing narrow band interference filters
The invention relates to a visibility standard utilizing narrow band interference filters. The standard comprises an emitter, a receiver and an energy detection device arranged on the receiver, a light emitting diode is arranged in the emitter, and a receiving filter is arranged before a receiving l...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | The invention relates to a visibility standard utilizing narrow band interference filters. The standard comprises an emitter, a receiver and an energy detection device arranged on the receiver, a light emitting diode is arranged in the emitter, and a receiving filter is arranged before a receiving lens in the receiver along the light proceeding direction; an energy detection photodiode is arranged in the energy detection device, and both a receiving photodiode and the energy detection photodiode are photodiodes in the same type and with low non-linear errors; and an energy detection filter is arranged before the energy detection photodiode in the energy detection device along the light proceeding direction, and both the receiving filter and the energy detection filter are narrow band interference filters matched with optical characteristics of the light emitting diode in the emitter. The scheme is used for overcoming effects of temperature drift on devices. |
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