Abstract: A system for stabilizing the temperature sensitivity in photonic circuits comprising a thermoelastic cladding directly overlaid on a photonic circuit, wherein the properties of the thermoelastic cladding are such that the temperature of the photonic circuit is passively stabilized, such as by adjustment of the effective refractive index of the photonic circuit. The thermoelastic cladding may comprise a negative thermo-optic coefficient and the photonic circuit has a positive thermo-elastic coefficient. The thermoelastic cladding may be a liquid, solid, or gas, and may be contained within a chamber having an inlet and an outlet. A pressure sensor may be contained within the chamber for monitoring pressure. The sensor can detect whether the fluid/gas has reached its maximum expansion and can send a signal when that happens. The pressure sensor is connected in a feedback loop and it sends an alarm once the chamber pressure is at a maximum.

Abstract: A computer-implemented method for measuring full field deformation characteristics of a deformable body. The method includes determining optical setup design parameters for measuring displacement and strain fields, and generating and applying a dot pattern on a planar side of a deformable body. A sequence of images of the dot pattern is acquired before and after deformation of the body. Irregular objects are eliminated from the images based on dot light intensity threshold and the object area or another geometrical cutoff criterion. The characteristic points of the dots are determined, and the characteristic points are matched between two or more of the sequential images. The displacement vector of the characteristic points is found, and mesh free or other techniques are used to estimate the full field displacement based on the displacement vector of the characteristic points. Strain tensor or other displacement-derived quantities can also be estimated using mesh-free or other analysis techniques.