PROBLEM TO BE SOLVED: To provide a fluid detector capable of measuring various state amounts based on the flow rate of fluid in a flow channel by a relatively simple structure.SOLUTION: A fluid detector 10 comprises: a flow sensor 11 provided in an air flow channel F and measurement means 12 for measuring a flow state of the air flowing through the flow channel F on the basis of output from the flow sensor 11. The flow sensor 11 has: a displacement member 25 that is arranged intersecting a flow direction of the air and provided in such a manner as to be displaced according to the flow state of the air a light-emitting element 30 that emits light toward the displacement member 25 and a light-receiving element 31 that detects light emitted from the light-emitting element 30 and reflected by the displacement member 25. The measurement means 12 acquires the flow rate or flow velocity of the air, or a change degree of the flow rate or flow velocity per predetermined period of time, from a light receiving state of the light-receiving element 31 on the basis of data indicating a relationship between the light receiving state and the flow rate or flow velocity.COPYRIGHT: (C)2013,JPO&INPIT【課題】比較的簡単な構造で、流路内の流体の流量に基づく各種状態量を測定可能にする。【解決手段】流体検出装置10は、空気の流路Fに設けられるフローセンサ11と、フローセンサ11からの出力に基づいて、流路Fを通過する空気の流れ状態を測定する測定手段12とを備えている。フローセンサ11は、空気の流れ方向に交差するように配置されて空気の流れ状態に応じて変位可能に設けられた変位部材25と、変位部材25に向かって発光する発光素子30と、変位部材25で反射した発光素子30からの光を検知可能な受光素子31とを備えている。測定手段12では、受光素子31の受光状態と流量若しくは流速との関係を示すデータに基づき、前記受光状態から、空気の流量若しくは流速、又は、当該流量若しくは流速の所定時間当たりの変化度が求められる。【選択図】 図2
