3 results about "Spectral responsivity" patented technology

The present application relates to a kind of automobile interior atmosphere lamp color calibration methods based on multi-channel fiber synchronous acquisition, color calibration is carried out by the measuring system of two-stage calibration, wherein two-stage calibration includes first stage: under the same geometric condition, the same region of the N fiber probes is simultaneously aligned with a uniformity standard light source, the original spectral signal of each channel is synchronously collected, the relative spectral response correction coefficient of each channel relative to reference channel is calculated based on the signal;Second stage: select a standard transfer light source measured, and using any one specified fiber probe calibrated by the first stage, under standard geometric conditions, the standard transfer light source is aligned and collected, to obtain the original signal;Combined with the known absolute spectral radiance value of the standard transfer light source and the corresponding, the absolute spectral responsivity function of the entire system is calculated.The present application can multi-channel synchronous acquisition, and greatly shorten the measurement time.

This invention relates to the field of photoelectric detection technology, providing an integrating sphere detector, a spectral responsivity calibration device, and a calibration method. The integrating sphere detector includes a hollow sphere and multiple photodetectors. The hollow sphere has a spherical cavity, a light inlet, and multiple light outlets. The inner wall of the spherical cavity is coated with a diffuse reflection layer. The light inlet is located on one side of a first reference surface passing through the center of the sphere. The multiple light outlets are evenly distributed circumferentially on a second reference surface. The second reference surface is parallel to a third reference surface passing through the center of the sphere, on the side opposite to the light inlet. The third reference surface is perpendicular to the first reference surface. The multiple photodetectors and multiple light outlets are arranged one-to-one. A light beam enters the spherical cavity through the light inlet, with the incident direction deviating from the center of the sphere and incident on the inner wall of the spherical cavity on the side of the second reference surface opposite to the light inlet. The integrating sphere detector of this invention has a simple structure, good uniformity, and facilitates accurate spectral responsivity calibration in the 1200-2300 nm range.

A diffractive optical network-based multispectral imaging system is trained using deep learning to create a virtual spectral filter array at the output image field-of-view. The diffractive multispectral imager performs spatially-coherent imaging over a large spectrum, and at the same time, routes a pre-determined set of spectral channels onto an array of pixels at the output plane, converting a monochrome focal plane array or image sensor into a multispectral imaging device without any spectral filters or image recovery algorithms. Furthermore, the spectral responsivity of this diffractive multispectral imager is not sensitive to input polarization states. Due to its compact form factor and computation-free, power-efficient and polarization-insensitive forward operation, the diffractive multispectral imager can be transformative for various imaging and sensing applications and be used at different parts of the electromagnetic spectrum where high-density and wide-area multispectral pixel arrays are not widely available.