Flow speed measurement sensor

Abstract

The invention discloses a flow rate measurement transducer which consists of an impact tube, a total-pressure transducer and a static pressure transducer which are respectively arranged at the front end and the lateral part of the impact tube. The total-pressure transducer and the static pressure transducer respectively consist of a silicon piezoresistive sensitive component which is a silicon sensitive element that is provided with Wheatstone bridge structure, and with E type island film structure, the silicon piezoresistive sensitive component in the total-pressure transducer is arranged in the front end lumen of the impact tube and installed at the same level with a total-pressure and entrance-pressure hole at the front end of the lumen, while the silicon piezoresistive sensitive component in the static pressure transducer is arranged in the middle lumen of the impact tube and installed at the same level with the output pipe-outlet of the static-pressure and lead-pressure pipe in the impact tube, the static-pressure and lead-pressure pipe is arranged at the lateral part of the impact tube, while the tail part of the impact tube is connected with an output horizontal pipe, the signal leads of the two transducers are respectively led out through the communicated lumens of the impact tube and the output horizontal pipe and then respectively led to an output cable after passing through two signal conditioning circuits. The flow rate measurement transducer has one-time measurement of total pressure, static pressure, dynamic state and flow rate, and the output signal can be directly connected with the instrument for display and data processing.

Description

technical field [0001] The invention relates to a flow velocity measurement sensor, in particular to a flow velocity measurement sensor in which two miniature piezoresistive pressure sensors are installed in a standard pitot tube. Background technique [0002] At present, there are mainly pitot tubes, hot wire (or hot film) anemometers, laser Doppler current meters, and particle image velocimeters to measure the dynamic velocity of water flow. Other methods are evolved based on the basic principles of these methods. At present, the four basic flow rate measurement methods have their own characteristics and application ranges. The four methods have their own advantages and disadvantages, and it is impossible to replace each other. Pitot tube is widely used in industrial occasions because of its convenient use, high measurement accuracy and high cost performance. [0003] The traditional pitot tube type speedometer forms a stagnation point at the front end of the pitot tube, ...

AI Technical Summary

Problems solved by technology

However, due to the large inertia of the liquid column in the pycnometer, the speed of the water flow cannot be measured in time during the dynamic measurement.

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