Orthogonal-polarization compensation method for measuring unsteady vertical force of a bumblebee in a wind tunnel
✍ Scribed by Xiannan Meng; Hao Wang; Lijiang Zeng; Zhijing Feng; Teruhito Mishima
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 144 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0030-3992
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✦ Synopsis
It is important to measure the unsteady vertical force of an insect in a wind tunnel for studying the ight performance of insects. Optical method can measure it with high accuracy, but it is a ected by air turbulence. An orthogonal-polarization compensation (OPC) method is developed for measuring the beating force of a bumblebee in a wind tunnel and compensating the error due to beam uctuations induced by air turbulence. The applicability of the OPC method was conÿrmed by using a piezo translator to generate the tilt angle variation. The results show that by using the OPC method, the error in tilt angle measurement due to air turbulence can be decreased by about 80% compared with that using the conventional angle measurement method. The OPC method was then applied to measure the tilt angle variation caused by the beating motion of a bumblebee attached to one end of a sensor block in a wind tunnel for a wind velocity of 1:1 m s -1 . The results conÿrmed the e ectiveness of this new method.