EP-4741783-A1 - DETECTION DEVICE AND DETECTION METHOD

EP4741783A1EP 4741783 A1EP4741783 A1EP 4741783A1EP-4741783-A1

Abstract

This application provides a detection device, used in the detection field, for example, the spectrum detection field. The detection device includes an optical coupler, a scattering component, a detector, and a processor. The optical coupler is configured to: receive a to-be-detected light beam, and couple the to-be-detected light beam to the scattering component. The scattering component is configured to: scatter the to-be-detected light beam, and output a plurality of scattered to-be-detected light beams at different angles in time division mode to the detector. The plurality of scattered to-be-detected light beams are in one-to-one correspondence with the plurality of angles. The detector is configured to detect a plurality of different regions of the plurality of scattered to-be-detected light beams, to obtain a plurality of electrical signals. The detector is further configured to transmit the plurality of electrical signals to the processor. The processor is configured to compute the plurality of electrical signals to obtain related information of the to-be-detected light beams. In the technical solutions provided in this application, output directions of the to-be-detected light beams are adjusted, so that the related information of the to-be-detected light beams can be obtained by the detector in time division mode, to reduce costs of the detection device.

Inventors

NIU, Xinxiang
DONG, Xiaowen
ZHANG, XIANG
ZHOU, MIN

Assignees

Huawei Technologies Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20240826

Claims (15)

A detection device, comprising an optical coupler, a scattering component, a detector, and a processor, wherein the optical coupler is configured to: receive a to-be-detected light beam, and couple the to-be-detected light beam to the scattering component; the scattering component is configured to: scatter the to-be-detected light beam, and output a plurality of scattered to-be-detected light beams at different angles to the detector, wherein the plurality of scattered to-be-detected light beams are in one-to-one correspondence with the plurality of angles; the detector is configured to: detect a plurality of different regions of the plurality of scattered to-be-detected light beams to obtain a plurality of electrical signals, and transmit the plurality of electrical signals to the processor, wherein the plurality of regions are in one-to-one correspondence with the plurality of electrical signals, and the plurality of regions are in one-to-one correspondence with the plurality of scattered to-be-detected light beams; and the processor is configured to compute the plurality of electrical signals to obtain related information of the to-be-detected light beams.
The detection device according to claim 1, wherein the scattering component comprises a scattering medium and an optical modulator, wherein the scattering medium is configured to: receive the to-be-detected light beam from the optical coupler, scatter the to-be-detected light beam, and cause the scattered to-be-detected light beams to be incident to the optical modulator; and the optical modulator is configured to output the plurality of scattered to-be-detected light beams at the different angles to the detector.
The detection device according to claim 1, wherein the scattering component comprises an optical modulator and a scattering medium, wherein the optical modulator is configured to: receive the to-be-detected light beam from the optical coupler, and output a plurality of to-be-detected light beams at different angles to the scattering medium; and the scattering medium is configured to: scatter the plurality of to-be-detected light beams to obtain a plurality of scattered to-be-detected light beams, and cause the plurality of scattered to-be-detected light beams to be incident to the detector, wherein the plurality of to-be-detected light beams are in one-to-one correspondence with the plurality of scattered to-be-detected light beams.
The detection device according to any one of claims 1 to 3, wherein the detector is a linear array detector, and the optical modulator is a one-dimensional optical modulator.
The detection device according to claim 4, wherein a photosensitive surface of the detector is on a first plane, and a difference between a first width of a light spot irradiated by the scattered to-be-detected light beam on the first plane and a second width of the photosensitive surface is less than or equal to 50 percent of the first width.
The detection device according to any one of claims 1 to 5, wherein the plurality of regions comprise a first region and a second region, and the first region and the second region comprise an overlapping region.
The detection device according to claim 6, wherein an area of the overlapping region is less than or equal to 90 percent of an area of the first region.
The detection device according to any one of claims 1 to 7, wherein the detection device further comprises a focus adjuster, and the focus adjuster is located on an optical transmission path between the scattering component and the detector, wherein the focus adjuster is configured to change a focal length of the scattered to-be-detected light beam.
The detection device according to any one of claims 1 to 8, wherein the detection device further comprises a mask, and the mask is located on the optical transmission path between the scattering component and the detector.
The detection device according to any one of claims 1 to 4 and 6 to 9, wherein the photosensitive surface of the detector is on the first plane, and a ratio of a size of the light spot irradiated by the scattered to-be-detected light beam on the first plane to a size of the photosensitive surface is from 1,000 to 1,000,000.
The detection device according to any one of claims 1 to 10, wherein the detection device further comprises a thermoelectric cooler controller, wherein the thermoelectric cooler controller is configured to keep a temperature of the scattering medium within a target interval.
The detection device according to any one of claims 1 to 11, wherein the detection device further comprises a first vibration isolator and a second vibration isolator, wherein the first vibration isolator is configured to reduce vibration of the scattering medium; and the second vibration isolator is configured to reduce vibration of the optical modulator.
A detection method, comprising: scattering a to-be-detected light beam to obtain scattered to-be-detected light beams; detecting, by a detector, a first region of the scattered to-be-detected light beam to obtain a first electrical signal; changing an output direction of the scattered to-be-detected light beam, to cause a light spot of the scattered to-be-detected light beam to move relative to a photosensitive surface of the detector; detecting, by the detector, a second region of the scattered to-be-detected light beam to obtain a second electrical signal; and obtaining related information of the to-be-detected light beams based on the first electrical signal and the second electrical signal.
The detection method according to claim 13, wherein the first region and the second region comprise an overlapping region; the obtaining the related information of the to-be-detected light beams based on the first electrical signal and the second electrical signal comprises: obtaining the related information of the to-be-detected light beams based on h electrical signals, wherein the h electrical signals comprise the first electrical signal and the second electrical signal, and h is an integer greater than or equal to 2; and the method further comprises: adjusting an area size of the overlapping region based on a value of h.
The detection method according to claim 13 or 14, wherein the obtaining the related information of the to-be-detected light beams based on the first electrical signal and the second electrical signal comprises: obtaining the related information of the to-be-detected light beams based on h electrical signals, wherein the h electrical signals comprise the first electrical signal and the second electrical signal, and h is an integer greater than or equal to 2; and the method further comprises: adjusting a size of the light spot of the scattered to-be-detected light beam based on a value of h.

Description

This application claims priority to Chinese Patent Application No. 202311127450.2, filed with the China National Intellectual Property Administration on August 30, 2023 and entitled "DETECTION DEVICE AND DETECTION METHOD", which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the detection field, and in particular, to a detection device and a detection method. BACKGROUND A spectrometer is configured to obtain spectrum information of a to-be-detected light beam. The spectrometer includes a scattering medium and a multi-channel detector. The scattering medium is configured to scatter the to-be-detected light beam to generate a characteristic scattering pattern. The scattering medium is formed by pressing particles with small average particle sizes, which requires low preparation costs. The small average particle size ensures that light with different wavelengths passes through different optical paths when penetrating the scattering medium, to generate speckle patterns with different distributions. The multi-channel detector is configured to obtain a plurality of electrical signals corresponding to a plurality of different regions in the speckle pattern. The spectrum information of the to-be-detected light beam can be obtained by computing the plurality of electrical signals. However, high costs of the detector lead to high costs of the spectrometer. SUMMARY This application provides a detection device and a detection method. Output directions of to-be-detected light beams are adjusted, so that related information of the to-be-detected light beams can be obtained by a detector in time division mode, to reduce costs of the detection device. A first aspect of this application provides a detection device. The detection device includes an optical coupler, a scattering component, a detector, and a processor. The optical coupler is configured to: receive a to-be-detected light beam, and couple the to-be-detected light beam to the scattering component. The scattering component is configured to: scatter the to-be-detected light beam, and output a plurality of scattered to-be-detected light beams at different angles in time division mode to the detector. The plurality of scattered to-be-detected light beams are in one-to-one correspondence with the plurality of angles. For example, at a first moment, the scattering component is configured to output a 1st scattered to-be-detected light beam to the detector at a first angle; and at a second moment, the scattering component is configured to output a 2nd scattered to-be-detected light beam to the detector at a second angle. The detector is configured to detect a plurality of different regions of the plurality of scattered to-be-detected light beams, to obtain a plurality of electrical signals. The plurality of regions are in one-to-one correspondence with the plurality of electrical signals. The plurality of regions are in one-to-one correspondence with the plurality of scattered to-be-detected light beams. The detector is further configured to transmit the plurality of electrical signals to the processor. The processor is configured to compute the plurality of electrical signals to obtain related information of the to-be-detected light beams. In an optional implementation of the first aspect, the scattering component includes a scattering medium and an optical modulator. The scattering medium is configured to: receive the to-be-detected light beam from the optical coupler, scatter the to-be-detected light beam, and cause the scattered to-be-detected light beams to be incident to the optical modulator. The optical modulator is configured to output the plurality of scattered to-be-detected light beams to the detector at the different angles. The plurality of scattered to-be-detected light beams are in one-to-one correspondence with the plurality of angles. In this application, a relative state between the to-be-detected light beam and the scattering medium remains unchanged, and system stability is higher. In an optional implementation of the first aspect, the scattering component includes an optical modulator and a scattering medium. The optical modulator is configured to: receive the to-be-detected light beam from the optical coupler, and output a plurality of to-be-detected light beams at different angles to a scattering medium. A plurality of to-be-detected light beams are in one-to-one correspondence with the plurality of angles. The scattering medium is configured to: scatter the plurality of to-be-detected light beams to obtain a plurality of scattered to-be-detected light beams. The plurality of to-be-detected light beams are in one-to-one correspondence with the plurality of scattered to-be-detected light beams. The scattering medium is further configured to cause the plurality of scattered to-be-detected light beams to be incident to the detector. In this application, positions of the scattering medium and the detec