Patent ID: 7799277

Claim:
A detection device for detecting a concentration of a detection object, comprising: an examination flow channel for passing a first fluid containing a detection object, a reference flow channel for passing a second fluid, extending adjacently along the examination flow channel, a semi-permeable member located between the examination flow channel and the reference flow channel and capable of causing an interaction therebetween, a light emission unit for irradiating the second fluid in the reference flow channel, the light emission unit comprising a semiconductor laser and a turning micromirror to irradiate directly from the laser to a prescribed position, and a detection unit having a plurality of light receiving sensors for receiving the irradiated light by way of the reference flow channel, wherein the concentration of the detection object in the examination flow channel is recognized based on a deflection of an optical path of emitted light caused by a gradient index in the second fluid resulting from the interaction, and the deflection of the optical path is evaluated by differential output of the plurality of light receiving sensors.