Wind speed measuring device based on microsphere resonator

Abstract

The invention relates to the field of wind speed measuring devices and in particular to a wind speed measuring device based on a microsphere resonator. The wind speed measuring device comprises a probe, a semiconductor laser, a broadband light source and a spectrograph. The probe comprises a conducting fiber and a microsphere. The measuring end of the conducting fiber is provided with an inner cone, and the inner cone is provided therein with the microsphere. The structure using the silicon microsphere and the fiber cone has the small-sized probe. The coupling technique of the fiber cone can effectively excite a high-Q echo wall mode in the silicon microsphere, and obtain a series of resonance peaks. The positions of the resonance peaks are very sensitive to the temperature change of the microsphere. When the microsphere is placed in a flow field, the heat conduction changes the temperature of the microsphere. Since the silicon microsphere has a high thermo-optical coefficient and a low thermal expansion coefficient, and the movement of the resonance peaks is mainly caused by a thermo-optic effect, the change in wind speed and the movement of the resonance peaks have high linearityso that accurate measurement of the wind speed can be achieved.

Description

technical field [0001] The invention relates to the field of wind speed measuring devices, in particular to a wind speed measuring device based on a microsphere resonator. Background technique [0002] Wind speed detection has applications in meteorology, aerodynamics, and flow monitoring. In the application of wind speed detection in the airtight small-size flow channel, it is often required that the anemometer probe is small enough. It can be placed in the flow channel, and it will not have a great impact on the flow field. Among the existing wind speed measurement methods, the resistance wire heating method has problems such as low measurement accuracy, small measurement range (generally 0-30m / s) and electrical insulation; the impeller anemometer has problems such as large probe volume and low detection accuracy. ;Although the volume of the pitot tube is relatively small, it has strict requirements on the installation position. It must be installed in the straight part ...

AI Technical Summary

Problems solved by technology

Among the existing wind speed measurement methods, the resistance wire heating method has problems such as low measurement accuracy, small measurement range (generally 0-30m / s) and electrical insulation; the impeller anemometer has problems such as large probe volume and low detection accuracy. ;Although the volume of the Pitot tube is relatively small, it has strict requirements on the installation position. It must be installed in the straight part of the flow channel and away from the bend or the area where the caliber changes. In addition, it must be set to the direction of the flow field when used. Right angle, and can only be used in the measurement field of high-speed flow field

In short, the anemometers currently used mainly have problems such as large anemometer probe size, limited speed measurement range, and low accuracy.

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