Light splitting type multi-barrel detector rapid hyperspectral detection system

Abstract

The invention discloses a rapid hyperspectral detection system of a light splitting type multi-barrel detector. The rapid hyperspectral detection system of the light splitting type multi-barrel detector comprises a wide-spectrum lens, a wide-spectrum spatial light intensity modulator, a light splitting element, a plurality of monochromatic detectors, a current-voltage converter and a calculator, the wide-spectrum lens is used for collecting light emitted from a target object and projecting the light to the wide-spectrum spatial light intensity modulator; the wide-spectrum spatial light intensity modulator is used for carrying out light intensity modulation on light projected by the wide-spectrum lens; the light splitting element is used for splitting the light modulated by the wide-spectrum spatial light intensity modulator into monochromatic light of a plurality of wavebands; the plurality of monochromatic detectors are used for collecting intensity to obtain a plurality of monochromatic light intensity signals and converting the monochromatic light intensity signals into a plurality of current signals; the current-to-voltage converter is used for converting the plurality of current signals into a plurality of voltage signals; and the calculator is used for reconstructing a plurality of monochromatic images according to the plurality of voltage signal single pixels and summarizing the monochromatic images into a hyperspectral image. According to the invention, the quality of the reconstructed spectral image can be improved.

Description

Technical Field

[0001] The present application relates to the field of optical technology, and in particular to a spectroscopic multi-barrel detector rapid hyperspectral detection system. Background Art

[0002] Hyperspectral imaging technology combines two-dimensional spatial information and spectral dimension information. It is widely used in remote sensing, agriculture, medicine, industrial detection and other fields. It has the advantages of high spectral resolution, non-contact detection, accurate component identification and classification. Existing hyperspectral imaging technologies mainly include scanning imaging technology, filter imaging technology, computational imaging technology, confocal microscope imaging technology, and Raman spectroscopy imaging technology. These imaging technologies have their own advantages and disadvantages. Among them, single-pixel-based hyperspectral imaging technology has received widespread attention in recent years, especially in low-light environments, fast dynamic imaging and high-resolution imaging applications. The reconstruction speed of hyperspectral images is linearly related to the number of spectra. The higher the number of spectra, the longer the reconstruction time. Moreover, since the detector is a detector with a wide response spectrum, its monochromatic light response performance needs to be improved, which directly affects the quality of the spectral image, resulting in low quality of the reconstructed spectral image. Summary of the invention

[0003] The embodiment of the present application provides a spectroscopic multi-barrel detector rapid hyperspectral detection system, which can improve the quality of reconstructed spectral images.

[0004] In a first aspect, the present application provides a spectroscopic multi-barrel detector rapid hyperspectral detection system comprising a wide-spectrum lens, a wide-spectrum spatial light intensity modulator, a spectroscopic element, a plurality of monochromatic detectors, a current-to-voltage converter, and a calculator;

[0005] The wide-spectrum lens is used to collect light emitted from the target object and project it onto the wide-spectrum spatial light intensity modulator; the wide-spectrum spatial light intensity modulator is used to perform light intensity modulation on the light projected by the wide-spectrum lens; the spectroscopic element is used to divide the light modulated by the wide-spectrum spatial light intensity modulator into monochromatic light of multiple bands; the multiple monochromatic detectors are used to collect the intensity of monochromatic light of multiple bands to obtain multiple monochromatic light intensity signals, and convert the multiple monochromatic light intensity signals into multiple current signals; the current-to-voltage converter is used to convert the multiple current signals into multiple voltage signals; the calculator is used to reconstruct multiple monochromatic images by single pixel based on the multiple voltage signals, and summarize them into a hyperspectral image.

[0006] Optionally, the spectroscopic multi-barrel detector rapid hyperspectral detection system includes an image acquisition card, which is used to rapidly collect a plurality of the voltage signals in multiple channels and transmit the plurality of the voltage signals to the calculator.

[0007] Optionally, the spectroscopic multi-barrel detector rapid hyperspectral detection system includes a microlens array, and the microlens array is used to focus the monochromatic light of multiple bands obtained by the spectroscopic element onto each of the monochromatic detectors.

[0008] Optionally, the broadband spatial light intensity modulator is a digital micromirror device or a rotating encoder disk.

[0009] Optionally, the beam splitting element is a grating or a prism.

[0010] Optionally, the monochromatic detector is a quantum dot monochromatic detector, and a plurality of the monochromatic detectors operate independently.

[0011] Optionally, the calculator is used to reconstruct a plurality of monochrome images according to a plurality of single pixels of the voltage signals using a discrete cosine transform algorithm.

[0012] Optionally, the wide spectrum spatial light intensity modulator is used to perform light intensity modulation on the light projected by the wide spectrum lens using a discrete cosine transform algorithm.

[0013] Optionally, the broadband lens is used to collect light reflected, transmitted or emitted from a target object and project the light onto the broadband spatial light intensity modulator.

[0014] Optionally, the current-to-voltage converter is a transimpedance amplifier, which is used to amplify the multiple current signals through transimpedance and convert them into multiple voltage signals.

[0015] In this application, compared with the related art, the spectroscopic multi-barrel detector rapid hyperspectral detection system includes a wide-spectrum lens, a wide-spectrum spatial light intensity modulator, a spectroscopic element, multiple monochromatic detectors, a current-voltage converter, and a calculator; the wide-spectrum lens is used to collect light emitted from the target object and project it onto the wide-spectrum spatial light intensity modulator; the wide-spectrum spatial light intensity modulator is used to modulate the light intensity of the light projected by the wide-spectrum lens; the spectroscopic element is used to divide the light modulated by the wide-spectrum spatial light intensity modulator into multiple bands of monochromatic light; multiple monochromatic detectors are used to collect the intensity of monochromatic light in multiple bands, obtain multiple monochromatic light intensity signals, and convert the multiple monochromatic light intensity signals into multiple current signals; the current-voltage converter is used to convert multiple current signals into multiple voltage signals; the calculator is used to reconstruct multiple monochromatic images according to the multiple voltage signals per pixel, and summarize them into a hyperspectral image. This application can improve the quality of the reconstructed spectral image.

[0016] This application achieves hyperspectral imaging without sacrificing temporal resolution and spatial resolution, and has obvious advantages when imaging with high spectral resolution and high spatial resolution is required; single-pixel imaging technology has the characteristics of anti-scattering, anti-atmospheric turbulence, and weak light detection, and can obtain higher quality images when used in remote sensing applications; each monochrome detector has better photoelectric response performance than a wide-spectrum detector, resulting in a higher quality reconstructed image. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a schematic diagram of an embodiment of a spectroscopic multi-barrel detector rapid hyperspectral detection system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] It should be noted that the principles of the present application are illustrated by implementing them in an appropriate computing environment. The following description is based on the illustrated specific embodiments of the present application and should not be considered as limiting other specific embodiments of the present application that are not described in detail herein.

[0020] In the following description of the present application, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it can be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0021] In the following description of the present application, the terms "first\second\third" involved are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present application described here can be implemented in an order other than that illustrated or described here.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0024] Please refer to Figure 1 In an embodiment of the present application, a spectroscopic multi-barrel detector rapid hyperspectral detection system includes a wide-spectrum lens, a wide-spectrum spatial light intensity modulator, a spectroscopic element, a plurality of monochromatic detectors, a current-voltage converter, and a calculator. The wide-spectrum lens is used to collect light emitted from a target object and project it onto the wide-spectrum spatial light intensity modulator; the wide-spectrum spatial light intensity modulator is used to modulate the light intensity of the light projected by the wide-spectrum lens; the spectroscopic element is used to divide the light modulated by the wide-spectrum spatial light intensity modulator into monochromatic light of multiple bands; multiple monochromatic detectors are used to collect the intensity of monochromatic light of multiple bands, obtain multiple monochromatic light intensity signals, and convert the multiple monochromatic light intensity signals into multiple current signals; the current-voltage converter is used to convert multiple current signals into multiple voltage signals; the calculator is used to reconstruct multiple monochromatic images based on multiple voltage signals, and summarize them into a hyperspectral image. Single-pixel reconstruction is a new imaging method that uses a single-pixel detector and a spatial light modulator without spatial resolution to obtain an image through reconstruction. Compared with the traditional array detector imaging method, single-pixel imaging has the advantages of high sensitivity and anti-interference, and has very broad application prospects in many fields. The light field modulation strategy and image reconstruction method of single-pixel imaging have a great influence on the imaging results.

[0025] In the embodiment of the present application, the spectroscopic multi-barrel detector rapid hyperspectral detection system includes an image acquisition card, which is used to quickly collect multiple voltage signals in multiple channels and transmit the multiple voltage signals to a computer. An image acquisition card (Image Capture Card), also known as an image capture card, is a hardware device that can obtain digital video image information and store and play it out.

[0026] In the embodiment of the present application, the spectroscopic multi-barrel detector rapid hyperspectral detection system includes a microlens array, which is used to focus the monochromatic light of multiple bands obtained by the spectroscopic element to each monochromatic detector. The microlens array can be divided into two categories: a refractive microlens array and a diffractive microlens array. The diffraction microlens array uses the three-dimensional relief structure of the wavelength order of its surface to modulate and transform the light wave, and has the characteristics of being light, thin, and flexible in design. As a functional element, it can be widely used in various systems such as wavefront sensing, light focusing, and light shaping. The microlens array divides a complete laser wavefront into many tiny parts in space, and each part is focused on the focal plane by the corresponding small lens, and a series of microlenses can obtain a plane composed of a series of focal points. If the laser wavefront is an ideal plane wavefront, then a set of uniform and regular focal distributions can be obtained on the focal plane of the microlens array; however, the actual laser wavefront is not an ideal plane wavefront, and they are more or less distorted. After focusing with the microlens array, the focal point is no longer uniformly distributed, but is displaced from the ideal focal point.

[0027] In the embodiment of the present application, the wide-spectrum spatial light intensity modulator is a digital micromirror device (DMD) or a rotating encoder disk. DMD is also called a digital micromirror chip or a digital reflective optical element. It was invented by Texas Instruments and is an optical module manufactured using MEMS (micro-electromechanical system) technology. There are millions of tiny rotatable mirrors on the DMD chip, each of which is only a few microns in size. It can be quickly turned and rotated by controlling the voltage to reflect light at different angles. In this way, by adjusting the reflection angle, graphics or video pixels with different grayscale values ​​can be generated.

[0028] In the embodiments of the present application, the spectroscopic element is a grating or a prism. An optical device composed of a large number of parallel slits of equal width and spacing is called a grating. A commonly used grating is made by engraving a large number of parallel grooves on a glass sheet. The grooves are opaque parts, and the smooth part between the two grooves can transmit light, which is equivalent to a slit. A refined grating has thousands or even tens of thousands of grooves within a width of 1 cm. This grating that uses diffraction of transmitted light is called a transmission grating.

[0029] Prism, a transparent object surrounded by two intersecting but non-parallel planes, is used to split or disperse light beams. Prisms can be polarizing beam splitters, right-angle prisms, triangular prisms or equilateral prisms. Polarizing beam splitters consist of a pair of high-precision right-angle prisms, one of which has a polarizing beam splitter film on its hypotenuse. Right-angle prisms are usually used to turn the light path or deflect the image made by the optical system by 90°. Depending on the different orientations of the prisms, the image can be consistent left and right, upside down, or inconsistent up and down. Right-angle prisms can also be used for applications such as image combination and beam deviation. When using right-angle prisms, some optical coatings are usually applied. The right-angle prism itself has a typical angle and a large contact area. Therefore, compared with ordinary reflectors, right-angle prisms are easier to install and have better stability and strength to mechanical stress. They are the best choice for optical components of various devices and instruments. Triangular prisms are transparent bodies with a triangular optical cross-section. It is a triangular optical instrument made of transparent material and belongs to a dispersive prism, which can disperse complex light through the prism. The equilateral dispersion prism disperses a beam of light into different colors and is used in spectral analysis experiments and instruments. When a beam of light is tilted to the first side, due to the refractive index of the glass being related to the wavelength, different colors of light are refracted at different angles, resulting in a spectrum appearing on the other side. When the top angle is 60°, it can get the maximum dispersion and the minimum reflection loss. The higher the dispersion power or the smaller the Abbe number, the greater the role.

[0030] In the embodiment of the present application, the monochromatic detector is a quantum dot monochromatic detector. A plurality of monochromatic detectors work independently.

[0031] In an embodiment of the present application, a calculator is used to reconstruct multiple monochrome images based on multiple voltage signal single pixels using a discrete cosine transform algorithm. Discrete cosine transform (DCT for Discrete Cosine Transform) is a transform related to Fourier transform, which is similar to discrete Fourier transform, but only uses real numbers. This change is often used in signal processing and image processing for lossy compression of signals and images (including still images and moving images). In the compression algorithm, the input image is divided into 8*8 or 16*16 image blocks, and a DCT transform is performed on each image block; then the high-frequency coefficients are discarded, and the remaining coefficients are quantized to further reduce the amount of data; finally, lossless coding is used to complete the compression task. When decompressing, first perform an inverse DCT transform on each image block, and then splice the images into a complete image.

[0032] In the embodiment of the present application, the broadband spatial light intensity modulator is used to modulate the light intensity of the light projected by the broadband lens by using a discrete cosine transform algorithm.

[0033] In the embodiment of the present application, the broadband lens is used to collect light reflected, transmitted or emitted from the target object and project it onto the broadband spatial light intensity modulator.

[0034] In the embodiment of the present application, the current-to-voltage converter is a transimpedance amplifier, which is used to amplify multiple current signals across impedance and convert them into multiple voltage signals. The full name of the transimpedance amplifier (TIA) is trans-impedance amplifier, which is a type of amplifier. The amplifier type is defined according to the type of its input and output signals.

[0035] Compared with the related art, the spectroscopic multi-barrel detector rapid hyperspectral detection system includes a wide-spectrum lens, a wide-spectrum spatial light intensity modulator, a spectroscopic element, multiple monochromatic detectors, a current-voltage converter, and a calculator; the wide-spectrum lens is used to collect light emitted from the target object and project it onto the wide-spectrum spatial light intensity modulator; the wide-spectrum spatial light intensity modulator is used to modulate the light intensity of the light projected by the wide-spectrum lens; the spectroscopic element is used to divide the light modulated by the wide-spectrum spatial light intensity modulator into multiple bands of monochromatic light; multiple monochromatic detectors are used to collect the intensity of monochromatic light in multiple bands, obtain multiple monochromatic light intensity signals, and convert the multiple monochromatic light intensity signals into multiple current signals; the current-voltage converter is used to convert multiple current signals into multiple voltage signals; the calculator is used to reconstruct multiple monochromatic images according to the multiple voltage signals per pixel, and summarize them into a hyperspectral image. The present application can improve the quality of the reconstructed spectral image.

[0036] The present application realizes hyperspectral imaging without sacrificing temporal resolution and spatial resolution, and has obvious advantages when imaging with high spectral resolution and high spatial resolution is required; single-pixel imaging technology has the characteristics of anti-scattering, anti-atmospheric turbulence, and weak light detection, and can obtain higher quality images when used in remote sensing applications; each monochrome detector has better photoelectric response performance than a wide-spectrum detector, and obtains higher quality reconstructed images; complex precision mechanical components are eliminated, the structure is simpler, and the system cost is lower; each monochrome detector works independently, the number of spectra and characteristic wavelengths can be adjusted at any time, and system maintenance is convenient.

[0037] The above is a detailed introduction to a spectroscopic multi-barrel detector rapid hyperspectral detection system provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A spectroscopic multi-barrel detector rapid hyperspectral detection system, characterized in that: The spectroscopic multi-barrel detector rapid hyperspectral detection system comprises a wide-spectrum lens, a wide-spectrum spatial light intensity modulator, a spectroscopic element, a plurality of monochromatic detectors, a current-voltage converter, and a calculator; The wide-spectrum lens is used to collect light emitted from the target object and project it onto the wide-spectrum spatial light intensity modulator; the wide-spectrum spatial light intensity modulator is used to perform light intensity modulation on the light projected by the wide-spectrum lens; the spectroscopic element is used to divide the light modulated by the wide-spectrum spatial light intensity modulator into monochromatic light of multiple bands; the multiple monochromatic detectors are used to collect the intensity of monochromatic light of multiple bands to obtain multiple monochromatic light intensity signals, and convert the multiple monochromatic light intensity signals into multiple current signals; the current-to-voltage converter is used to convert the multiple current signals into multiple voltage signals; the calculator is used to reconstruct multiple monochromatic images by single pixel according to the multiple voltage signals, and summarize them into a hyperspectral image.

2. The spectroscopic multi-barrel detector rapid hyperspectral detection system according to claim 1 is characterized in that: The spectroscopic multi-barrel detector rapid hyperspectral detection system comprises an image acquisition card, which is used for rapidly collecting a plurality of the voltage signals in multiple channels and transmitting the plurality of the voltage signals to the calculator.

3. The spectroscopic multi-barrel detector rapid hyperspectral detection system according to claim 1 is characterized in that: The spectroscopic multi-barrel detector rapid hyperspectral detection system comprises a microlens array, which is used to focus the monochromatic light of multiple bands obtained by the spectroscopic element onto each of the monochromatic detectors.

4. The spectroscopic multi-barrel detector rapid hyperspectral detection system according to claim 1, characterized in that: The broadband spatial light intensity modulator is a digital micromirror device or a rotary encoder disk.

5. The spectroscopic multi-barrel detector rapid hyperspectral detection system according to claim 1, characterized in that: The light splitting element is a grating or a prism.

6. The spectroscopic multi-barrel detector rapid hyperspectral detection system according to claim 1, characterized in that: The monochromatic detector is a quantum dot monochromatic detector, and a plurality of the monochromatic detectors work independently.

7. The spectroscopic multi-barrel detector rapid hyperspectral detection system according to claim 1, characterized in that: The calculator is used to reconstruct multiple monochrome images according to multiple single pixels of the voltage signals using a discrete cosine transform algorithm.

8. The spectroscopic multi-barrel detector rapid hyperspectral detection system according to claim 1, characterized in that: The wide spectrum spatial light intensity modulator is used to modulate the light intensity of the light projected by the wide spectrum lens by using a discrete cosine transform algorithm.

9. The spectroscopic multi-barrel detector rapid hyperspectral detection system according to claim 1, characterized in that: The broadband lens is used to collect light reflected, transmitted or emitted from the target object and project the light onto the broadband spatial light intensity modulator.

10. The spectroscopic multi-barrel detector rapid hyperspectral detection system according to claim 1, characterized in that: The current-to-voltage converter is a transimpedance amplifier, which is used to amplify the multiple current signals through transimpedance and convert them into multiple voltage signals.

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