Earticle

Aiming at the defects of traditional variable focal length relative orientation algorithm, such as strong dependence on initial value and poor convergence, the paper proposes a variable focal length relative orientation method based on p-h algorithm. In order to solve the defects caused by rotation matrix formed by trigonometric function, this method uses unit quaternion instead of trigonometric function to describe rotation matrix, solving algorithm parameters iteratively according to the least square principle. New method is optimized by p-h algorithm, and it established the corresponding solution model. The experimental results showed that the improved algorithm has the following characteristics: initial value weak dependence, fast convergence, adaptability for large angle, which solved multivaluedness and singularity problems.

A microlens connected to microfluidic channel is fabricated. The microlens is sealed with an elastomeric membrane which deforms by pressure of fluid driven by a syringe pump resulting in the shape change of the microlens. The optical properties of the microlens could be controlled by changing the microlens shape. The microlens system were made of an elastomer, PDMS, using molding from a photoplastic master patterned by UV photolithography. The test results show the optical property of the lens could be made into convex and concave type by applying the fluidic pressure positive and negative.