Pipeline delay-based system and method for measuring concentrations of components of fruit juice sugar

The invention discloses a pipeline delay-based system and a method for measuring concentrations of components of fruit juice sugar. The system comprises a spiral pipeline sample cavity, a circuit box, an ultrasonic transmitting transducer and an ultrasonic receiving transducer, wherein the ultrasonic transmitting transducer and the ultrasonic receiving transducer are respectively located at the two ends of the spiral pipeline sample cavity; the circuit box is located outside the spiral pipeline sample cavity and is externally provided with display equipment; the circuit box comprises a main control unit, a memory, a transmitting circuit, a receiving circuit and a pulse detection decision circuit; the main control circuit is respectively connected with the memory, the transmitter circuit, the pulse detection decision circuit and the display equipment; the ultrasonic transmitting transducer is connected with the transmitting circuit in the circuit box, the ultrasonic receiving transducer is connected with the receiving circuit in the circuit box; and the receiving circuit is connected with the pulse detection decision circuit. In the method, the concentrations of the components of fruit juice are calculated through measuring the propagation time of ultrasonic in the spiral pipeline sample cavity. The method not only omits the step of calculating the sound speed to reduce the system computation but also effectively improves the detection accuracy.