Abstract: A three-dimensional imaging system and method are provided. The three-dimensional imaging system includes: an ultrashort pulse laser light source configured to generate a detection beam; a supercontinuum spectrum generator configured to generate a supercontinuum spectrum based on the detection beam passing through the supercontinuum spectrum generator; a pulse separation delayer configured to generate a continuous pulse sequence of different wavelengths with a time interval based on the supercontinuum spectrum; a multi-frequency pulse interference fringe generator configured to generate multi-frequency interference fringe patterns of different wavelength ranges with a time interval based on the continuous pulse sequence; and an image acquisition device configured to acquire an optical signal reflected by a sample irradiated by the multi-frequency interference fringe patterns to obtain a three-dimensional topography of the sample.

Abstract: The present disclosure discloses a lighting fixture, which allows for easy installation. The lighting fixture comprises a body and an installation plate. The body comprises a lower cover and an upper cover located above the lower cover. The upper cover comprises a protruding plate and a plurality of pins. The installation plate comprises a groove and a plurality of contact pads. The groove is located at the center of the installation plate and cooperates with the protruding plate. The groove has two clips symmetrically located on the inner side of the peripheral edge of the groove. The clip and the bayonet slot are matched with each other. The two contact pads are symmetrically located on the two sides of the groove and contact with the pin.