Abstract: A measurement system of photoluminescence properties of a sample, comprises a radiation source module configured to generate a first radiation, an excitation optical path coupled to the radiation source module, a support structured to support a sample to be optically coupled to excitation optical path and adapted to provide a photoluminescence radiation, and collection path coupled to the sample and configured to propagate the photoluminescence radiation. The system also includes an analysis device configured to receive the photoluminescence radiation and provide data/information on photoluminescence properties of sample. At least one path between the excitation path and the collection path comprises a respective adjustable birefringent common-path interferometer module configured to produce first and second radiations adapted to interfere with each other.

Abstract: A measurement system of photoluminescence properties of a sample, comprises a radiation source module configured to generate a first radiation, an excitation optical path coupled to the radiation source module, a support structured to support a sample to be optically coupled to excitation optical path and adapted to provide a photoluminescence radiation, and collection path coupled to the sample and configured to propagate the photoluminescence radiation. The system also includes an analysis device configured to receive the photoluminescence radiation and provide data/information on photoluminescence properties of sample. At least one path between the excitation path and the collection path comprises a respective adjustable birefringent common-path interferometer module configured to produce first and second radiations adapted to interfere with each other.

Abstract: An inline skate having an inline skate wheel; an in line skate axle which extends through the inline skate wheel and has a female receiving element; an inline skate frame which supports the inline skate axle, wherein the inline skate axle has a first contacting surface for contacting the inline skate frame; a securing element that has a second contacting surface for contacting the inline skater frame, and a male thread element for engaging the female receiving element of the inline skate axle, and a positive acting element for exerting a retention force against the inline skater frame, wherein the female receiving element does not have threads prior to engagement of the female receiving element with the male thread element, and wherein the male thread element is a self forming thread which forms a thread in the female receiving element upon engagement.