Flow velocity sensor based on polymer optical waveguide

Abstract

The invention discloses a flow velocity sensor based on polymer optical waveguide, belonging to the technical field of flow field sensors and manufacturing thereof. The flow velocity sensor can be used for high-precision detection and feedback control of the surface flow field of an aircraft. The flow velocity sensor comprises a laser light source and a driving circuit, a polymer optical waveguide, an optical fiber, a position sensitive detector, a signal processing system and a fixed casing; the polymer optical waveguide and the optical fiber output end are fixed and directly coupled, the optical fiber input end is connected with the laser light source and the driving circuit, the polymer optical waveguide, the optical fiber, and the laser light source and the driving circuit are fixed to one side of the fixed casing, the position sensitive detector and the signal processing system are connected and are fixed to the opposite side of the fixed casing, and the top of the fixed casing is provided with a through hole. The polymer optical waveguide is good in flexibility and can transmit optical signals, the small flexural deflection of the polymer caused by the small change of the flow field can be amplified on the position sensitive detector after being subjected to optical path transmission, so that the flow velocity of the flow filed can be measured in high precision.

Description

technical field [0001] The invention relates to a flow velocity sensor based on a polymer optical waveguide, which is suitable for flow field detection and feedback control on the surface of an aircraft, and belongs to the technical field of flow field sensors and their manufacture. Background technique [0002] Aircraft are important tools for humans to explore nature, and changes in the flow field on their surfaces affect their performance. Therefore, it is of great significance to realize high-precision monitoring of the velocity of the flow field on the surface of the aircraft. Existing flow rate sensors include pyroelectric, capacitive, piezoresistive, and piezoelectric. These types of sensors generally have shortcomings such as being greatly affected by the environment, low measurement accuracy, and poor reliability. [0003] Due to its advantages of high measurement accuracy and strong anti-interference ability, optical fiber is more and more used in the field of fl...

AI Technical Summary

Problems solved by technology

But the sensor has complex mechanical structure, bulky and poor reliability

In addition, the sensor uses a target body to measure the impact force. The target body has a large area and has a great influence on the flow velocity of the flow field, making the measurement accuracy of the flow velocity low.

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