7 results about "Light scattering" patented technology

Techniques for monitoring the quality (e.g., optical and mechanical properties) in optical waveguides (e.g., photonic crystal fibers) are disclosed. Additionally, techniques for detecting and localizing defects in the waveguides are also described. Pulses of light are launched into one end of an optical waveguide. The amount of light scattered out of the same end of the waveguide (i.e., a backscattered or reflected signal) is monitored at certain wavelengths specific to the spectral characteristics of the waveguide. Transmission characteristics and defect localization can be determined from the backscattered signal.

A display apparatus including a backlight module and a transmissive display panel is provided. The backlight module includes a light guide plate, a patterned light scattering structure, and a light emitting device. The light guide plate has a first surface, a second surface opposite to the first surface, and a light incident surface connecting the first surface and the second surface. The patterned light scattering structure is disposed on the light guide plate or inside the light guide plate. The patterned light scattering structure includes a plurality of light scattering strips. The light emitting device is configured to emit an illumination light and the light incident surface is disposed on the path of the illumination light. The light scattering strips are configured to scatter the illumination light. The transmissive display panel is disposed beside the backlight module. The first surface faces the transmissive display panel.

The invention relates to a composite microsphere with a radial fibrous mesoporous shell layer/hollow nuclear layer structure and a preparation method of the composite microsphere. The composite microsphere is provided with a cavity, a nuclear layer and a mesoporous shell layer, wherein the mesoporous shell layer is provided with radial fibrous mesoporous channels. The composite microsphere is highin sphericity and surface regularity, uniform in particle size distribution and high in monodispersity and strength. The preparation method of the composite microsphere is simple and feasible and facilitates industrialization; preparation of the radial fibrous mesoporous shell layer and removal of an organic template can be completed by means of a one-step method. The composite microsphere has the advantages of high light scattering efficiency, large specific surface area, low density, high porosity and the like, can be widely applied in light diffusion materials and used as a light diffusionagent for heavy haze and can also be adopted in the fields of fillers of coatings, cosmetics, catalysts and water treatment.

The invention discloses a device for detecting the surface imperfection of a curved-surface optical element. The device comprises a lighting system and an imaging system and is characterized in that light sources are arranged in the lighting system, the imaging system comprises an imaging lens, an imaging device and a processor in signal connection with the imaging device, the light sources are arranged outside the imaging lens, and the imaging device at least comprises a coaxial imaging mechanism or a lateral imaging mechanism. The device has the advantages that on the basis of the light scattering principle, the light source evenly irradiates the surface of the curved-surface optical element, the imaging system above the curved-surface optical element detects the imaging of the curved-surface optical element, the curved-surface optical elements of different curvature radiuses can be detected, the difficulty that the surface imperfection of the curved-surface optical element cannot beautomatically detected is solved, and the device is low in cost and simple in structure.

The invention relates to a signal controller for temperature alarming. The signal controller comprises a sealed temperature sensing body, a light emitter and a signal control body which are relativelyarranged on the inner lateral wall of the temperature sensing body, a solid chemical material arranged between the light emitter and the signal control body. The signal control body comprises a lightreceiver and an alarming signal triggerelectrically connected with the light receiver. The alarming signal trigger is further externally connected with an alertor. The light receiver and the light emitter are arranged at the positions with the same horizontal height. The alarming signal trigger sends an alarming reminding message to the alertor based on intensity of a light beam received by the light receiver. When temperature inside the temperature sensing body reaches the sublimation temperature of the solid chemical material, the solid chemical material sublimates into colored gas. The signal controller used for temperature alarming enables the light shielding effect to be more prominent based on the principle of light scattering by colored gas, and limitation of incidence angle of light is overcome.

The invention provides a silicon wafer processing method and a silicon wafer. The silicon wafer processing method comprises the following steps of detecting a first defect parameter of a local light scattering defect of a target silicon wafer, under the condition that the first defect parameter is greater than a first defect threshold, detecting a second defect parameter of an uncleanable defect in the local light scattering defects, and under the condition that the second defect parameter is greater than a second defect threshold, marking the target silicon wafer as a silicon wafer to be reversely polished. According to the embodiment of the invention, the silicon wafers of which the local light scattering defects are greater than the first defect threshold value and the uncleanable defects in the local light scattering defects are greater than the second defect threshold value are subjected to reverse polishing treatment, so that the number of defects existing in the target silicon wafer is reduced or reduced, and the defects existing in the silicon wafers can be effectively eliminated; and the excessive treatment waste process is avoided, and the rework cost is saved.