A fast hyperspectral detection system of a spectroscopic multi-barrel detector

Abstract

The application discloses a kind of split optical multi-barrel detector fast hyperspectral detection system, split optical multi-barrel detector fast hyperspectral detection system includes wide spectrum lens, wide spectrum spatial light intensity modulator, light splitting element, multiple monochromatic detector, current voltage converter, calculator;Wide spectrum lens is used to collect the light emitted from target object and projects to wide spectrum spatial light intensity modulator;Wide spectrum spatial light intensity modulator is used to carry out light intensity modulation to the light projected by wide spectrum lens;Light splitting element is used to divide the light modulated by wide spectrum spatial light intensity modulator into multiple waveband monochromatic light;Multiple monochromatic detector is used for intensity acquisition, obtains multiple monochromatic light intensity signals, and is converted into multiple current signals;Current voltage converter is used to convert multiple current signals into multiple voltage signals;Calculator is used to reconstruct multiple monochromatic images according to multiple voltage signals single pixel, and is summarized into hyperspectral image.The application can improve the quality of reconstructed spectral image.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical technology, in particular to a split optical multi-barrel detector fast hyperspectral detection system. BACKGROUND

[0002] Hyperspectral imaging technology combines two-dimensional spatial information and spectral dimension information, and is widely used in remote sensing, agriculture, medicine, industrial detection and other fields, and has the advantages of high spectral resolution, non-contact detection, accurate component identification and classification. The existing hyperspectral imaging technology mainly includes scanning imaging technology, filtering imaging technology, computing imaging technology, confocal microscope imaging technology and Raman spectrum imaging technology. Each of these imaging technologies has its own advantages and disadvantages. In recent years, hyperspectral imaging technology based on single-pixel has attracted widespread attention, especially in low-light environment, fast dynamic imaging and high-resolution imaging applications. The reconstruction speed of hyperspectral image 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 wide response spectrum detector, its monochromatic light response performance needs to be improved, which directly affects the quality of the spectral image, resulting in a low quality of the reconstructed spectral image. SUMMARY

[0003] The embodiment of the present application provides a split optical multi-barrel detector fast hyperspectral detection system, which can improve the quality of the reconstructed spectral image.

[0004] In a first aspect, the present application provides a split optical multi-barrel detector fast hyperspectral detection system, which 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.

[0005] 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 projected by the wide spectrum lens. The light splitting element is used to split the light modulated by the wide spectrum spatial light intensity modulator into monochromatic light of multiple wavebands. The plurality of monochromatic detectors are used to collect the intensity of the monochromatic light of multiple wavebands to obtain a plurality of monochromatic light intensity signals, and convert the plurality of monochromatic light intensity signals into a plurality of current signals. The current-voltage converter is used to convert the plurality of current signals into a plurality of voltage signals. The calculator is used to reconstruct a plurality of monochromatic images according to the plurality of voltage signals, and aggregate them into a hyperspectral image.

[0006] Optionally, the split optical multi-barrel detector fast hyperspectral detection system comprises an image acquisition card, which is used to collect a plurality of voltage signals in multiple ways and transmit the plurality of voltage signals to the calculator.

[0007] Optionally, the spectrometer multi-barrel detector rapid hyperspectral detection system comprises a microlens array, the microlens array is used for focusing the monochromatic light of multiple wave bands obtained by the spectrometer element to each monochromatic detector.

[0008] Optionally, the wide spectrum spatial light intensity modulator is a digital micromirror device or a rotating coded disk.

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

[0010] Optionally, the monochromatic detector is a quantum dot monochromatic detector, and multiple monochromatic detectors work independently.

[0011] Optionally, the calculator is used for reconstructing multiple monochromatic images from multiple voltage signals by using a discrete cosine transform algorithm.

[0012] Optionally, the wide spectrum spatial light intensity modulator is used for modulating the light intensity of the light projected by the wide spectrum lens by using a discrete cosine transform algorithm.

[0013] Optionally, the wide spectrum lens is used for collecting the light reflected or transmitted or emitted by a target object and projecting the light onto the wide spectrum spatial light intensity modulator.

[0014] Optionally, the current-voltage converter is a transimpedance amplifier, the transimpedance amplifier is used for transimpedance amplifying and converting multiple current signals into multiple voltage signals.

[0015] In the present application, compared with the related art, the spectrometer multi-barrel detector rapid hyperspectral detection system comprises a wide spectrum lens, a wide spectrum spatial light intensity modulator, a spectrometer element, multiple monochromatic detectors, a current-voltage converter, and a calculator; the wide spectrum lens is used for collecting the light emitted by a target object and projecting the light onto the wide spectrum spatial light intensity modulator; the wide spectrum spatial light intensity modulator is used for modulating the light intensity of the light projected by the wide spectrum lens; the spectrometer element is used for dividing the light modulated by the wide spectrum spatial light intensity modulator into monochromatic light of multiple wave bands; the multiple monochromatic detectors are used for collecting the intensity of the monochromatic light of multiple wave bands, obtaining multiple monochromatic light intensity signals, and converting the multiple monochromatic light intensity signals into multiple current signals; the current-voltage converter is used for converting the multiple current signals into multiple voltage signals; and the calculator is used for reconstructing multiple monochromatic images from multiple voltage signals by using a discrete cosine transform algorithm and combining the multiple monochromatic images into a hyperspectral image. The present application can improve the quality of the reconstructed spectral image.

[0016] The application realizes hyperspectral imaging without sacrificing time resolution and spatial resolution, and has obvious advantages in imaging requirements with high spectral resolution and high spatial resolution; the 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 for remote sensing applications; each monochrome detector has better photoelectric response performance than wide-spectrum detectors, and higher quality reconstructed images are obtained. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0018] Figure 1 FIG. 1 is a schematic diagram of an embodiment of a split-type multi-barrel detector fast hyperspectral detection system provided by the application. DETAILED DESCRIPTION

[0019] It should be noted that the principles of the application are exemplified in an appropriate operating environment. The following description is based on the exemplified specific embodiments of the application, which should not be regarded as limiting other specific embodiments of the application not described in detail.

[0020] In the following description of the application, "some embodiments" are described, which describe a subset of all possible embodiments, but it can be understood that "some embodiments" can be the same subset or different subset of all possible embodiments, and can be combined with each other without conflict.

[0021] In the following description of the application, the terms "first", "second", "third" are only to distinguish similar objects, and do not represent a specific order of the objects. It can be understood that "first", "second", "third" can be interchanged in a specific order or sequence as allowed, so that the application embodiments described herein can be implemented in an order other than that illustrated or described herein.

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

[0023] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person skilled in the art without creative work are within the protection scope of the present application.

[0024] Please refer to Figure 1 In the embodiments of the present application, the split-type multi-barrel detector fast hyperspectral detection system 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 to collect light emitted from a target object and project the light onto the wide-spectrum spatial light intensity modulator. The wide-spectrum spatial light intensity modulator is used to modulate the light projected by the wide-spectrum lens. The light splitting element is used to split the light modulated by the wide-spectrum spatial light intensity modulator into monochromatic light of multiple wavebands. The plurality of monochromatic detectors are used to collect the intensity of the monochromatic light of the multiple wavebands, obtain a plurality of monochromatic light intensity signals, and convert the plurality of monochromatic light intensity signals into a plurality of current signals. The current-voltage converter is used to convert the plurality of current signals into a plurality of voltage signals. The calculator is used to reconstruct a plurality of monochromatic images from a single pixel according to the plurality of voltage signals, and aggregate the plurality of monochromatic images into a hyperspectral image. Single-pixel reconstruction is a new imaging method that uses a single-pixel detector without spatial resolution and a spatial light modulator to obtain an image by reconstruction. Compared with the traditional array detector imaging method, single-pixel imaging has the advantages of high sensitivity and anti-interference, and has a very broad application prospect 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 embodiments of the present application, the split-type multi-barrel detector fast hyperspectral detection system comprises an image acquisition card. The image acquisition card is used to collect a plurality of voltage signals in multiple ways and transmit the plurality of voltage signals to the calculator. The image acquisition card (Image Capture Card) is a hardware device that can acquire digital video image information and store and play it out.

[0026] In the embodiment of the present application, the spectral multi-barrel detector fast hyperspectral detection system comprises a microlens array, which is used to focus the monochromatic light of multiple wave bands obtained by the spectral splitting element to each monochromatic detector. The microlens array can be divided into two types of refractive microlens array and diffractive microlens array. The diffractive microlens array modulates and transforms light waves by using the three-dimensional relief structure of the surface in the order of wavelength, and has the characteristics of lightness, thinness and flexible design. As a functional element, it can be widely used in wavefront sensing, light focusing and light shaping systems. The microlens array divides a complete laser wavefront into many small parts in space, and each part is focused on the focal plane by a corresponding small lens. A series of microlenses can obtain a plane composed of a series of focal points. If the laser wavefront is an ideal plane wavefront, a set of uniform and regular focal point distribution can be obtained on the focal plane of the microlens array; however, the actual laser wavefront is not an ideal plane wavefront, and it has more or less distortion. After focusing by the microlens array, the focal points are no longer uniformly distributed, but are displaced from the ideal focal points.

[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 disc. The DMD is also called a digital micromirror chip or a digital reflective optical element. It is an optical module manufactured by using MEMS (micro-electro-mechanical system) technology, and is invented by Texas Instruments. There are millions of small rotatable mirrors on the DMD chip, each mirror is only a few microns in size, and can be quickly turned by controlling the voltage. Different angles of light can be reflected by rotating the mirrors. In this way, different gray value patterns or video pixels can be generated by adjusting the reflection angle.

[0028] In the embodiment of the present application, the spectral splitting element is a grating or a prism. An optical device composed of a large number of parallel slits with equal width and equal spacing is called a grating. The commonly used grating is made by engraving a large number of parallel scratches on a glass sheet. The scratches are opaque parts, and the smooth parts between the scratches can transmit light, which is equivalent to a slit. A refined grating has several thousand or even ten thousand scratches in a 1cm width. This grating that uses transmitted light diffraction is called a transmission grating.

[0029] A prism is a transparent object with flat, alternating refracting surfaces (faces) that refract light. The faces themselves need not be parallel to each other. Prisms are typically made from glass or plastic. Prisms can be polarization beam splitter prisms, right angle prisms, triple prisms, or equilateral prisms. A polarization beam splitter prism is composed of a pair of high precision right angle prisms, with the hypotenuse of one prism coated with a polarization beam splitter dielectric film. Right angle prisms are commonly used to turn the path of light or to deflect an image made by an optical system by 90°. Depending on the orientation of the prism, the image can be right side up, upside down, or neither. Right angle prisms can also be used for re-imaging, beam shifting, and other applications. When using a right angle prism, it is common to coat the prism with optical films. Right angle prisms have a typical angle and a large contact area. As a result, they are easier to mount and have better stability and strength against mechanical stress than regular mirrors. They are the best choice for optical components in various devices and instruments. A triple prism is a transparent body with an optical cross section in the shape of a triangle. It is a triangular optical instrument made of transparent material, belonging to a kind of dispersion prism, which can disperse polychromatic light through the prism. An equilateral dispersion prism disperses a beam of light into different colors, used in spectroscopy experiments and instruments. When a beam of light is tilted to the first side, different colors of light are refracted at different angles due to the wavelength-dependent refractive index of the glass, resulting in a spectrum 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 ability or the smaller the Abbe number, the larger the role.

[0030] In the embodiments of the present application, the monochrome detector is a quantum dot monochrome detector. The plurality of monochrome detectors independently work.

[0031] In the embodiments of the present application, the calculator is configured to reconstruct a plurality of monochrome images from a plurality of voltage signals by using a discrete cosine transform algorithm. Discrete cosine transform (DCT) is a kind of 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 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 data amount; finally, lossless coding is used to complete the compression task. When decompressing, first perform DCT inverse transform on each image block, and then splice the image into a complete image.

[0032] In the embodiments of the present application, the wide-spectrum spatial light intensity modulator is configured to modulate the light projected by the wide-spectrum lens by using a discrete cosine transform algorithm.

[0033] In the embodiments of the present application, the wide-spectrum lens is configured to collect light reflected or transmitted or emitted by a target object and project the light onto the wide-spectrum spatial light intensity modulator.

[0034] In the embodiments of the present application, the current-voltage converter is a trans-impedance amplifier, which is used to trans-impedance amplify and convert a plurality of current signals into a plurality of voltage signals. The trans-impedance amplifier (TIA) is a type of amplifier, which is defined according to the type of input and output signals.

[0035] Compared with the related art, the split-type multi-barrel detector rapid hyperspectral detection system includes 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 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 projected by the wide-spectrum lens. The light splitting element is used to split the light modulated by the wide-spectrum spatial light intensity modulator into monochromatic light of multiple wavebands. The plurality of monochromatic detectors is used to collect the intensity of the monochromatic light of multiple wavebands to obtain a plurality of monochromatic light intensity signals, and convert the plurality of monochromatic light intensity signals into a plurality of current signals. The current-voltage converter is used to convert the plurality of current signals into a plurality of voltage signals. The calculator is used to reconstruct a plurality of monochromatic images from the plurality of voltage signals, and aggregate 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 time resolution and spatial resolution, which is extremely obvious in the imaging demand of high spectral resolution and high spatial resolution. The 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 for remote sensing applications. Each monochromatic detector has better photoelectric response performance than a wide-spectrum detector, and can obtain higher quality reconstructed images. The complex and precise mechanical elements are omitted, the structure is simpler, and the system cost is lower. Each monochromatic detector works independently, and the number and characteristic wavelengths of the spectrum can be adjusted at any time, and the system maintenance is convenient.

[0037] The above describes in detail a split-type multi-barrel detector rapid hyperspectral detection system provided by the present application. The principles and implementation modes of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method and core idea of the present application. Meanwhile, for those skilled in the art, the specific implementation modes and application ranges can be changed according to the idea of the present application. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A rapid hyperspectral detection system using a spectroscopic multi-barrel detector, characterized in that, The fast hyperspectral detection system of the spectroscopic multi-barrel detector includes a broadband lens, a broadband spatial intensity modulator, a spectroscopic element, multiple monochromatic detectors, a current-voltage converter, and a calculator. The broadband lens is used to collect light emitted from the target object and project it onto the broadband spatial light intensity modulator; the broadband spatial light intensity modulator is used to modulate the light projected by the broadband lens; the beam splitter is used to divide the light modulated by the broadband spatial light intensity modulator into multiple bands of monochromatic light; multiple monochromatic detectors are used to acquire the intensity of the 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-to-voltage converter is used to convert the multiple current signals into multiple voltage signals. The calculator is used to reconstruct multiple monochrome images from multiple single pixels of the voltage signals and summarize them into a hyperspectral image; The broadband spatial light intensity modulator is used to modulate the light intensity of the light projected by the broadband lens using a discrete cosine transform algorithm. The calculator is used to reconstruct multiple monochrome images from multiple single pixels of the voltage signals using a discrete cosine transform algorithm.

2. The rapid hyperspectral detection system using a spectroscopic multi-barrel detector according to claim 1, characterized in that, The spectroscopic multi-barrel detector rapid hyperspectral detection system includes an image acquisition card, which is used to rapidly collect multiple voltage signals and transmit the multiple voltage signals to the calculator.

3. The rapid hyperspectral detection system using a spectroscopic multi-barrel detector according to claim 1, characterized in that, The fast hyperspectral detection system of the spectroscopic multi-barrel detector includes 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 rapid hyperspectral detection system using a spectroscopic multi-barrel detector according to claim 1, characterized in that, The broadband spatial light intensity modulator is a digital micromirror device or a rotating encoder disk.

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

6. The rapid hyperspectral detection system using a spectroscopic multi-barrel detector according to claim 1, characterized in that, The monochromatic detector is a quantum dot monochromatic detector, and multiple monochromatic detectors operate independently.

7. The rapid hyperspectral detection system using a spectroscopic multi-barrel detector 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 it onto the broadband spatial light intensity modulator.

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

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