8 results about "Spectral responsivity" patented technology

The application belongs to the technical field of wide band gap semiconductor photoelectric detection devices, and relates to a vertical structure GaN-based p-i-n type ultraviolet detector on a metal molybdenum substrate. Metal molybdenum is used as a substrate, there is a patterned back electrode layer on the upper surface of the metal molybdenum substrate, there is a molybdenum diffusion barrier layer on the upper surface of the metal molybdenum substrate which is not covered by the patterned back electrode layer, there are GaN buffer layer, n-type GaN layer, n-type Al x Ga 1‑x N layer, i-type Al y Ga 1‑y N layer and p-type Al z Ga 1‑z N layer are grown in sequence on the upper surface of the patterned back electrode layer and the molybdenum diffusion barrier layer in a lateral epitaxial growth mode, there is a passivation layer on the upper surface of the p-type Al z Ga 1‑z N layer, the passivation layer is slotted until the p-type Al z Ga 1‑z N layer is exposed, and a p-type electrode is arranged in the slot of the passivation layer. The application avoids cracks of each GaN-based film layer in the ultraviolet detector caused by thermal stress, increases spectral responsivity, and reduces response time.

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.

The application provides a kind of optical sensing component differential spectral responsivity test system, belongs to the technical field of spectral responsivity test, comprising: modulation light source, for emitting modulation light;Bias light source, for emitting bias light, bias light and modulation light form superimposed light;Standard optical sensing module, obtains the standard value of superimposed light intensity;Measured optical sensing module, obtains the measured value of superimposed light intensity;Signal and control unit calculates the differential spectral responsivity of measured optical sensing module under superimposed light.The application also provides a kind of optical sensing component differential spectral responsivity test method, solves the problem that the test method under darkroom condition in prior art is difficult to test and calibrate the spectral responsivity of optical sensing component under actual application scene condition, realizes the spectral responsivity of measured optical sensing module in the case of background light, and evaluates the anti-interference ability of measured optical sensing module.

This invention discloses a method for correcting the background radiation response of a polarization remote sensor in the shortwave infrared band. The method includes: first, establishing a remote sensor response function based on the sensor's absolute spectral responsivity, target spectral radiance, and background radiation; dividing the test temperature into multiple temperature levels and obtaining the background radiation response using polynomial fitting; measuring the background radiation responsivity using an integrating sphere and a vacuum high-low temperature environment simulation test system to obtain the equivalent blackbody temperature; obtaining the corresponding in-band weighted radiance using the ratio of the background radiation response signal to the equivalent spectral responsivity at a known reference temperature; calculating the total background radiation response using the evaluated weighted spectral radiance and the instrument's internal equivalent spectral responsivity; and analyzing the accuracy of the background radiation polarization response correction using a combined uncertainty assessment method. This invention can be used to eliminate background radiation, increase the dynamic range of the detection system, and improve the system's signal-to-noise ratio and measurement accuracy.

The invention discloses a method for calibrating the spectral responsivity of an array spectral radiometer based on monochromatic LEDs, and the method comprises the steps: providing a monochromatic LED group as a calibration light source, and sequentially igniting each monochromatic LED in the monochromatic LED group according to a peak wavelength sequence; calibrating the array spectrum radiometer according to the quantity value provided by the corresponding traceability certificate after the light emitting of the currently ignited monochromatic LED is stable, and generating a calibration file; turning off the current single-color LED, repeating the calibration step until the nth LED in the single-color LED group completes the calibration of the array spectrum radiometer, and obtaining n original calibration files in total; carrying out normalization and splicing processing on the n original calibration files; forming a calibration file and a complete spectral irradiance responsivity calibration file covering the wave band of 380-780 nm, and completing the calibration of the array spectrum radiometer. Out-of-band stray light caused by high-level spectrum and long-wave scattering in the array spectrum radiometer is remarkably reduced, so that the spectral radiation illuminance responsivity is closer to a true value, and the calibration accuracy is improved.

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.

The application discloses a method for determining the transparency of insulating material and the bifaciality of a back contact component, relates to the technical field of photovoltaic cells, and aims to determine the transparency of insulating material, thereby improving the calculation accuracy of the bifaciality of a back contact cell or a back contact component. The insulating material is formed on part of the back light surface of the back contact cell. The method for determining the transparency of the insulating material comprises the following steps: obtaining the first spectral responsivity corresponding to a first region on the back light surface side of the back contact cell and the second spectral responsivity corresponding to a second region under the same incident wave band. The surface of the first region is covered with the insulating material, and the surface of the second region is not covered with the insulating material. Based on the wavelength range of the incident wave band, the first spectral responsivity and the second spectral responsivity, the transparency of the insulating material under the incident wave band is determined. The method for determining the bifaciality of the back contact component comprises the method for determining the transparency of the insulating material.

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.