| 摘要 |
<p>A plant plankton distribution measuring device (1) comprising a laser fluorescence probe (7) having a streamline lower end, a laser light emitting section (8) for irradiating pulse laser light having a wavelength for exciting chlorophyll dye from the side face of the probe (7) into the water, and a light receiving section (9) for detecting fluorescence entering through the side face of the probe (7). The distribution measuring device (1) is dropped into the water, laser light irradiating direction of the laser light emitting section (8) is made to intersect the light receiving region of the light receiving section (9), fluorescence being emitted from plant planktons upon receiving the pulse laser light is received at the light receiving section (9), and then the quantity of plant planktons is measured based on the quantity of received light.</p> |
