| 摘要 |
An exemplary aspect of the present disclosure, there is provided a light detection device including a first detecting portion to detect fluorescence from a first detection position on a conveyor path along which a sheet is conveyed, a second detecting portion to detect afterglow from a second detection position on the conveyor path along which the sheet is conveyed, a lighting portion to apply excitation light over a range including the first detection position and not including the second detection position, a first reference member which includes fluorescent material that emits fluorescence by being excited by the lighting portion and which emits reference light toward the first detecting portion, a second reference member to emit reference light toward the second detecting portion when the sheet is present at the second detection position, the reference light not influencing a result of detection by the second detecting portion, and a correction controller to correct a result of detection by the first detecting portion based on the reference light detected by the first detecting portion and to correct a result of detection by the second detecting portion based on the reference light detected by the second detecting portion.
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