| 摘要 |
A particle detector includes: a gas cell in which a gaseous alkali metal atom is sealed; a light source that emits a plurality of coherent light beams containing first light and second light having different frequencies; a light detection unit that receives light and produces a detection signal according to the intensity of the received light, the light being emitted from the light source, passing through a space in which predetermined particles can be present, and being incident on the gas cell and passing therethrough before reaching the light detection unit; and an analysis assessor that performs analysis assessment of at least one of the following items based on the detection signal: whether or not the particles are present and the concentration thereof.
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