Patent ID: 8822904

Claim:
A plant sensor comprising: a first light emitter configured to emit first measuring light with a first wavelength to irradiate a growing condition measurement target with the first measuring light; a second light emitter configured to emit second measuring light with a second wavelength to irradiate the growing condition measurement target with the second measuring light; a light receiver configured to receive reflected light of each of the first and second measuring light from the growing condition measurement target and output a received light signal; a controller configured to control light emission such that the first light emitter emits the first measuring light and the second light emitter emits the second measuring light at timings different from each other; a light path merging unit configured to merge a first outgoing light path of the first measuring light from the first light emitter and a second outgoing light path of the second measuring light from the second light emitter; and a common outgoing light path connecting the light path merging unit to a light exit portion from which each of the first measuring light and the second measuring light is to be emitted to the growing condition measurement target.