Flow velocity measurement system based on fluorescent tracing technique and method thereof

The invention discloses a flow velocity measurement system based on fluorescent tracing technique and a method thereof. The flow velocity measurement system belongs to the technical field of flow velocity measurement. The method of the invention comprises the steps of respectively arranging a release point and a detecting point at positions which are separated from each other for L in the fluid flow direction; arranging a fluorescent agent releasing device at the release point and releasing the fluorescent agent; when the fluorescent agent arrives at the detecting point, generating a fluorescent signal under irradiation of an excitation light source, converting the fluorescent signal to an electric signal through a photosensitive diode, amplifying the electric signal and processing the amplified electric signal by a single-chip microcomputer; recording a time length t from releasing at the releasing point to arriving at the detecting point by the fluorescent agent; calculating a quotient between the length L and the time length t, namely the average flow velocity v of the measured fluid is obtained, and furthermore displaying the result. According to the flow velocity measurement system, the fluorescent tracing technique is introduced into the flow velocity measurement field and a new concept for flow velocity measurement is developed. The amount of the fluorescent agent used in the flow velocity measurement system is small, and the fluorescent agent can be quickly decomposed after releasing, and therefore no effect is generated for the ecological environment substantially.